What Passive Fire Protection and Compartmentation Businesses Sell For in 2026
EBITDA multiples for passive fire protection, fire door and compartmentation businesses in 2026, including how the cladding remediation pulse and the Building Safety Act change what buyers pay.


Updated August 2026 · refreshed quarterly. Next scheduled review: November 2026.
The passive fire protection and compartmentation market in 2026 is defined by a massive, government-mandated remediation pulse sitting on top of a smaller structural compliance base. Buyers are actively acquiring fire door, firestopping, and cladding remediation contractors to service this demand, but they are pricing the finite remediation runway very differently from ongoing maintenance revenue. In the UK, major compliance consolidators like Complii (formerly Compliance Group) have made multiple passive fire acquisitions in 2025 and 2026, including Total Fire Safety and Capital Fire Doors [1] [2]. Meanwhile, IDSL Group, backed by LDC, acquired Fire Doors Rite in early 2026 to strengthen its £51 million revenue compliance services division [3].
For contractors with a balanced mix of recurring compartmentation surveys, fire door maintenance, and multi-year remediation frameworks, valuations are strong. A premium passive fire protection business generating over £1 million ($1.3 million) in defended EBITDA typically commands a multiple between 5.5x and 8.0x. Larger regional platforms generating £3 million+ EBITDA frequently reach 7.0x to 9.0x, attracting aggressive bidding from private equity sponsors, such as IK Partners' acquisition of Checkmate Fire [4]. However, businesses over-indexed on short-term remediation projects or new-build subcontracting face steep discounts as buyers underwrite the eventual end of the cladding and compartmentation pulse.
Contents
- Why two businesses with the same EBITDA sell for very different prices
- The 2026 Passive Fire Protection Multiples Table
- How passive fire businesses are actually valued
- The size ladder, band by band
- The Thirty-Factor Framework
- Worked Examples
- United Kingdom Transactions (2025–2026)
- United States Transactions (2025–2026)
- Demand Drivers and Consolidation Map
- What kills the multiple
- Deal Structure by Size
- Listed Comparables
- FAQ
- Glossary
- Methodology and Sources
- About DealFlowAgent
- Related Guides
- References
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Why two businesses with the same EBITDA sell for very different prices
A passive fire contractor generating £1 million in EBITDA from replacing unsafe cladding on high-rise residential buildings is fundamentally a different asset from a contractor generating £1 million in EBITDA from ongoing fire door inspections and compartmentation maintenance for NHS trusts. Buyers price them differently because the sustainability of the earnings is not comparable.
The remediation business is servicing a finite demand pulse. The Building Safety Act and subsequent government funding programmes have created a multi-billion-pound market, but it has an endpoint. The maintenance and survey business is servicing structural, recurring compliance needs that will exist in perpetuity.
| Value Driver | Premium Profile | Discount Profile |
|---|---|---|
| Revenue Mix | High percentage of survey, inspection, and ongoing maintenance | 80%+ reliant on one-off remediation projects or new-build subcontracting |
| Certification | Company-level FIRAS, IFC, or LPS 1531 certification | Certifications tied to individual departing founders or subcontractors |
| Client Base | Long-term frameworks with public sector, healthcare, and education | Heavy concentration with a few Tier 1 main contractors |
| Liability Exposure | Flawless digital records (golden thread) and strong PI cover | Poor historic installation records and restricted fire safety PI cover |
| Labour Model | Directly employed, certified operatives | Heavy reliance on transient, uncertified agency labour |
| Earnings Sustainability | Clear visibility of structural revenue post-remediation | Earnings cliff-edge when current remediation frameworks end |
| Defect Risk | Zero exposure to historic high-risk residential building (HRB) defects | Significant historic installation work exposed to the 30-year DPA limitation |
Five moves that raise the multiple before you sell
- Separate pulse from structural revenue. Restructure your management accounts to clearly separate one-off remediation project revenue from recurring survey and maintenance revenue. Buyers will do this anyway; doing it first allows you to control the narrative.
- Audit historic liability. Conduct a rigorous internal review of all installations completed prior to June 2022 to assess exposure under the Defective Premises Act's 30-year retrospective limitation.
- Digitise the golden thread. Implement field service management software to ensure every fire door inspection, firestopping installation, and compartmentation survey is digitally recorded, photographed, and easily auditable by a buyer.
- Secure company-level certification. Ensure all FIRAS, IFC, or equivalent third-party certifications are firmly embedded within the company's quality management systems, not reliant on the founder's personal qualifications.
- Review PI insurance. Work with a specialist broker to ensure your Professional Indemnity insurance has adequate limits and minimal fire safety exclusions, as restricted cover is a major deal-breaker in diligence.
The 2026 Passive Fire Protection Multiples Table
The ladder below is banded by defended EBITDA, because that is the number buyers price (owner-operated businesses below roughly £250K of earnings are the exception, priced on SDE, covered in the note beneath the table). Ranges are the DealFlowAgent tier view, calibrated against the published evidence cited in each band's subsection and the 2025-2026 transactions in the deal tables; no public source publishes UK passive fire multiples by size band, so treat this as calibrated judgement anchored to the sources shown, not a price list. The lower bound of each range describes an unprepared, project-weighted business sold without competition; the upper bound describes a prepared, professionally represented one with strong structural survey and maintenance revenue. The factor framework is what moves a business between the two.
| Defended EBITDA | Indicative revenue** | Realistic range | Who actually buys at this size | What changes at this size |
|---|---|---|---|---|
| £250K-£500K | ~£2M-£4M | 3.0x-4.5x; strong survey books reach 5x | Trade buyers, first consolidator bolt-ons | Professional buyers arrive; revenue mix and certification status dominate the price |
| £500K-£1M | ~£4M-£8M | 4.0x-5.5x; 40%+ survey/maintenance reach 6x | UK consolidators' core bolt-on range, regional trade | The band Complii and IDSL are buying in; PI insurance and historic liability scrutiny intensifies |
| £1M-£2M | ~£8M-£16M | 5.5x-8.0x | PE bolt-ons, platform seed deals, strategic trade | £1M EBITDA opens institutional buyers and debt funding; the remediation pulse vs structural revenue split dictates the multiple |
| £2M-£3M | ~£16M-£25M | 6.5x-8.5x | Platform bolt-ons, PE platform entries | Management depth becomes a priced line item; self-delivery capability is essential |
| £3M-£5M | ~£25M-£40M | 7.0x-9.0x | PE platforms, strategics, FM self-delivery buyers | Platform grade: buyers underwrite you as the foundation, and pay for it |
| £5M-£10M | ~£40M-£80M | 8.0x-10.5x | Large PE, listed groups, European buyers entering the UK | Print territory: rare assets commanding premium platform multiples |
| £10M+ | £80M+ | 9.5x-12.0x+, structure-dependent | Institutional buyers, listed groups, large-cap PE | UK evidence thin at this size; listed service comps and large prints mark the reference points |
**Indicative revenue assumes the roughly 10-15% EBITDA margins we see in service-led UK passive fire businesses at each size (DealFlowAgent estimate from mandate work and filed UK accounts; no public source publishes UK passive fire margins by turnover band). Multiple ranges: DealFlowAgent tier view calibrated against the sources cited per band below and the linked 2025-2026 deal tables.
Below £250K of earnings: owner-operated businesses are priced on SDE rather than EBITDA, typically at 2.0x-3.0x depending on how much of the trading genuinely transfers without the owner. We advise at this size too, and the size ladder covers it honestly, including the fastest routes up: securing company-level FIRAS certification and digitising installation records.
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How passive fire businesses are actually valued
Defended EBITDA, not claimed EBITDA
Every valuation conversation in this trade starts from the same equation: enterprise value equals adjusted EBITDA multiplied by a multiple. What most owners underestimate is that both numbers are contested, and the first one is contested line by line.
Adjusted EBITDA starts from reported profit and adds back costs that will not continue under new ownership: the owner's above-market salary, personal vehicles, one-off legal or property costs. Buyers do not take that schedule on trust. Any serious acquirer, and every PE-backed one, runs a quality of earnings (QoE) review whose job is to disprove your adjustments. The number that survives that review is what we call defended EBITDA, and it is the number that gets priced.
Two disputes recur in this trade specifically. The first is the treatment of large, one-off remediation contracts: if a £2 million cladding replacement project inflated this year's EBITDA but will not repeat next year, buyers will normalise the earnings downwards to reflect the sustainable run-rate. The second is seasonality and the working capital peg: a project-heavy business's working capital in July looks nothing like its February position, and a peg set naively off a twelve-month average can move six figures of value on a mid-sized deal. Sellers who bring 24 months of monthly working capital data to the table set the peg; sellers who do not, accept it.
The practical implication: mark your own homework before the buyer's accountants do. A conservatively drawn, evidenced bridge that a QoE review confirms within a few per cent is worth more than any single operational improvement, because it changes the multiple applied to every pound.
The multiple is a quality score
The multiple is not a market constant you look up; it is the buyer's compressed judgement of how safely your earnings transfer to them. Two businesses with identical £1M EBITDA routinely transact more than a full turn apart. The spread is explained by the questions every acquirer's investment committee asks: how much of the revenue is structural versus pulse, what happens when the founder leaves, does the FIRAS certification survive scrutiny, how exposed is the book to historic Defective Premises Act liability, and how many credible bidders are at the table. Section five of this guide breaks that judgement into the 30 factors buyers actually score.
Below roughly £250K of earnings: SDE, not EBITDA
At the small end the arithmetic changes basis. An owner-operated business where the owner surveys, quotes, fits and invoices does not have EBITDA in any meaningful sense; it has seller's discretionary earnings: profit plus the owner's full compensation, priced on the understanding that the buyer works in the business. Published guidance generally puts the switch to EBITDA-basis pricing at around $1M of earnings, though in practice buyers start deducting a manager's replacement salary well below that.
The hardest truth at the small end: a business that is really a well-paid job with a van does not command a multiple at all; it trades near the value of its contracts, kit and goodwill to the nearest competitor. The encouraging corollary is that the first tranche of genuinely transferable earnings is the most valuable earnings a small operator ever builds, and the route to it (company-level certification, digitised records, separated personal costs) is short and known.
The remediation pulse vs. structural revenue
This is the analytical spine of passive fire valuation. How much of the earnings survives the end of the remediation programme? Remediation programmes (cladding replacement, major compartmentation upgrades) are building-safety-driven, government-funded or landlord-funded, large contract values, multi-year, and finite. A buyer discounts revenue with a visible end date. New-build subcontracting is cyclical and carries main-contractor payment risk. Survey and inspection (compartmentation surveys, fire door inspections) is repeatable, lower ticket, and generates the remedial pipeline - this is the only segment with a genuine recurring characteristic. Never blend these segments silently; a business at 80% remediation revenue is being bought for a runway, while a business at 30% remediation with a survey book underneath it is being bought for long-term sustainability.
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The size ladder, band by band
Size is the first thing every buyer screens on, before they read a line of your accounts. Each band below states the evidence behind its range, who transacts there, and what changes crossing in. The published evidence base for this trade is sparse; the honest way to use this ladder is as calibrated judgement anchored to the sources shown, not as a price list. The strongest UK anchor across the whole curve is Dealsuite's UK & Ireland adviser survey (H2 2025): an average of 5.4x EBITDA across all SME sectors, rising from 3.3x at £200K of EBITDA to 8.4x at £10M, a spread of over five turns driven by size alone [13].
Below £250K earnings: the owner-operator band
Priced on SDE (profit plus the owner's full compensation), on the understanding that the buyer steps into the owner's boots. Typical range 2.0x-3.0x SDE (DealFlowAgent view). A certificated UK passive fire business should beat generic medians. The honest constraint at this size is transferability, not the market. A business that cannot trade without its owner is priced as an income stream rather than an enterprise. The two fastest fixes are securing company-level FIRAS or IFC certification in place of individual qualifications, and digitising all installation records to prove compliance.
£250K-£500K defended EBITDA: professional buyers arrive
3.0x-4.5x, with strong survey books reaching 5x (DealFlowAgent tier view; anchors: Dealsuite's UK size curve starts at 3.3x around £200K EBITDA, all-sector UK&I data [13]). This is the first band where trade acquirers and consolidators genuinely compete. What changes crossing in: your accounts are read by professionals, so the gap between claimed and defendable EBITDA starts to cost real money, and revenue mix becomes the dominant pricing question. A project-led business here still prices like a job book; a survey-led business prices like an annuity.
£500K-£1M defended EBITDA: the consolidators' core bolt-on range
4.0x-5.5x, with 40%+ survey/maintenance reaching 6x (DealFlowAgent tier view; anchors: the Dealsuite UK size curve passes roughly 4x-5x through this band). This is the size Complii and IDSL Group have been buying regularly across the UK. Because so many funded buyers compete here, process quality is worth as much as any operational lever: the difference between one consolidator negotiating alone and four held in parallel is routinely a full turn. What changes crossing in: PI insurance and historic liability scrutiny intensifies dramatically, as buyers assess exposure under the Defective Premises Act.
£1M-£2M defended EBITDA: the institutional threshold
5.5x-8.0x (DealFlowAgent tier view; anchors: the Dealsuite curve passes roughly 5x-6x through this band). Crossing £1M of defended EBITDA is the single most important size threshold in this market: institutional buyers' minimum-size screens switch on, acquisition debt becomes readily available against your earnings, and PE bolt-on teams that would not open a smaller information memorandum will open yours. Competition widens from trade-plus-consolidators to trade, consolidators, PE platforms and search funds at once. What changes crossing in: the split between finite remediation pulse revenue and structural maintenance revenue dictates the multiple.
£2M-£3M defended EBITDA: management depth gets priced
6.5x-8.5x (DealFlowAgent tier view; anchors: the upper Dealsuite curve). At this size a buyer is no longer buying a book of work; it is buying an organisation, and it will price the difference between a business the founder still runs day to day and one with an operations lead, a service manager and a functioning scheduling system. The same £2.5M of EBITDA with a second tier in place and clean data is worth millions more than a founder-centric operation that requires the buyer to build the management team post-completion. Self-delivery capability (minimal subcontracting) is essential here.
£3M-£5M defended EBITDA: platform grade
7.0x-9.0x (DealFlowAgent tier view). Businesses of this scale with company-level certification and long-term public sector frameworks are scarce assets. They attract direct interest from mid-market private equity funds seeking a new platform investment, rather than just bolt-on acquirers. The multiple is driven by the business's ability to act as the foundation for further acquisitions. What changes crossing in: the buyer is underwriting your systems, your brand, and your leadership team's ability to acquire and integrate smaller competitors.
£5M-£10M defended EBITDA: the print territory
8.0x-10.5x (DealFlowAgent tier view). These are established national players. They are targeted by mid-cap private equity firms looking for a new platform investment or by international trade buyers seeking immediate scale in the UK market. The multiple reflects the business's ability to acquire and integrate smaller competitors itself, and its sophisticated digital compliance infrastructure.
£10M+ EBITDA: institutional scale
9.5x-12.0x+, structure-dependent (DealFlowAgent tier view). Assets of this size are rare and trade at premium platform multiples. The buyer pool consists of global infrastructure services groups and top-tier private equity sponsors. Transactions at this level are complex, involving significant earn-outs, equity rollover structures, and intense regulatory and liability scrutiny.
The Thirty-Factor Framework
The multiple is not a market constant; it is the buyer's compressed judgement of how safely your earnings transfer to them. The DealFlowAgent methodology breaks that judgement into six dimensions and thirty specific factors that acquirers and their diligence advisers actually test.
The same business can score 4.1 out of 10 unprepared and 6.9 out of 10 prepared. On our tier mapping, that movement represents the difference between a 5.0 to 6.0x asset and a 6.5 to 7.5x asset, unlocking millions in enterprise value before a single additional customer is won. Notably, Dimension B (Deal Process & Buyer Access) is the cheapest to move and the only one that moves through specialist representation; the 25 business factors move through internal work.
Dimension A: Financial (22% weighting)
| Factor | Premium Profile | Discount Profile |
|---|---|---|
| F1. Revenue growth and scale | Consistent year-on-year growth; clear £1M+ EBITDA threshold | Flat or declining revenue; sub-scale |
| F2. Quality of earnings | Bridge defended; 5-day month-end close; rolling forecasts hit | Unreconciled financials; owner adjustments disproved |
| F3. Gross margin structure | 45%+ blended gross margin; strong survey vs project mix | Low margins driven by competitive tender new-build projects |
| F4. Working capital efficiency | Favourable payment terms on public sector frameworks | Heavy retention lock-ups from main contractors |
| F5. Forecast credibility | 3 years of forecasts delivered within 5%; strong MI | No monthly accounts; forecasts routinely missed |
Dimension B: Deal Process & Buyer Access (22% weighting)
This dimension materially moves the overall price by a double-digit percentage. It is driven by having a dedicated sell-side adviser who truly understands the niche.
| Factor | Premium Profile | Discount Profile |
|---|---|---|
| D1. Specialist representation | Mandated specialist in the exact passive fire niche | Founder self-running, or generalist broker |
| D2. Buyer access and insight | Pre-qualified relationships with known valuation criteria | Cold list of trade names; no relationship insight |
| D3. Deal-team niche expertise | Team knows standards (FIRAS, DPA 1972) and buyers cold | Adviser needs educating by the company |
| D4. Adviser brand credibility | Strong response rates; fast NDAs; parallel bidders held | Outreach ignored; single-party talks; no tension |
| D5. Evidenced buyer demand | 10+ logged approaches including PE platforms | Unlogged, unevidenced, or zero inbound approaches |
Dimension C: Customer & Revenue (16% weighting)
| Factor | Premium Profile | Discount Profile |
|---|---|---|
| C1. Customer concentration | Top client <10%; long-term healthcare/education frameworks | Top client >30% of revenue; heavy main-contractor reliance |
| C2. End-market diversification | 5+ end-markets; regulated, non-discretionary demand | 60%+ in one market; heavy discretionary commercial build |
| C3. Contract quality | Prime contractor on multi-year national frameworks | Tier 2/3 subcontractor reliant on others winning work |
| C4. Client retention and churn | Churn <6% with cause codes and win-back tracking | Churn >15% or unmeasured |
| C5. Share of wallet | Full lifecycle: survey, installation, and ongoing maintenance | Single-line penetration; installation-only contractor |
Dimension D: Operations (14% weighting)
| Factor | Premium Profile | Discount Profile |
|---|---|---|
| O1. Direct labour utilisation | 75%+ sustained; operative-level visibility | 60-70% or measured inconsistently |
| O2. Scheduling and dispatch | All work dispatched in-platform with routing logic | Dispatch by phone/WhatsApp; no travel logic |
| O3. Subcontract dependency | High proportion of directly employed, certified operatives | Heavy reliance on transient, uncertified agency labour |
| O4. Right-first-time quality | Failed visits <3%; dedicated internal QA function | Failed visits >10%; QA left entirely to installing operatives |
| O5. Systems integrity | Fully integrated field service and compliance software | Paper-based inspection reports and scheduling |
Dimension E: People & Organisation (13% weighting)
| Factor | Premium Profile | Discount Profile |
|---|---|---|
| P1. Key-person dependency | Business runs for months without founder; institutional relationships | Founders hold key client relationships and FIRAS/IFC certs |
| P2. Management depth | Documented cover per role; team presents in diligence | Spans of control >8; no genuine second tier |
| P3. Workforce retention | Operative churn <10%; structured training programmes | Operative churn >20%; permanent recruitment struggles |
| P4. Knowledge documentation | Impeccable photographic and digital records of all installations | Incomplete records exposing buyer to historic liability |
| P5. Incentive alignment | Executed shareholders' agreement; aligned EMI scheme | Unpapered option promises; minority holders without drag-along |
Dimension F: Strategic (13% weighting)
| Factor | Premium Profile | Discount Profile |
|---|---|---|
| S1. Market position | Top-tier position in defined territory with unmatched route density | Thin, scattered coverage; no dominant territory |
| S2. Regulatory tailwind | Core revenue mandated by current regulation (e.g., Building Safety Act) | Discretionary services; no regulatory driver |
| S3. Accreditation moat | Company-level FIRAS, IFC, or LPS 1531 certification | Lapsed certifications or reliance on individual operatives |
| S4. Organic growth engine | Mapped whitespace; running campaigns; capacity planned | Growth from founder relationships and inbound luck |
| S5. Exit readiness | Clean historic record; strong PI cover with minimal fire safety exclusions | Significant historic HRB work exposed to 30-year DPA limitation |
Worked Examples
Example 1: The Structural Compliance Premium (Illustrative) Company A generates £1.5 million in defended EBITDA. 60% of its revenue comes from ongoing fire door inspections, maintenance, and compartmentation surveys for NHS trusts and universities. 40% is from remediation frameworks. The company has company-level FIRAS certification, directly employs its operatives, and maintains a flawless digital golden thread. The founders have built a second tier of management and stepped back from daily operations.
- Defended EBITDA: £1,500,000
- Multiple applied: 7.2x (Upper half of the £1M-£2M band due to structural revenue mix, clean liability profile, and management depth)
- Enterprise Value: £10,800,000
Example 2: The Remediation Pulse Discount (Illustrative) Company B also generates £1.5 million in defended EBITDA. However, 85% of its revenue is derived from two large, government-funded cladding and external wall remediation projects that will complete in 18 months. The remaining 15% is ad-hoc new-build firestopping subcontracting. The company relies heavily on agency labour and has significant historic installation exposure prior to 2022. The founder still prices all major tenders.
- Defended EBITDA: £1,500,000
- Multiple applied: 5.5x (Bottom of the £1M-£2M band due to the finite demand pulse, liability risk, and founder dependency)
- Enterprise Value: £8,250,000
United Kingdom Transactions (2025–2026)
| Date | Target | Acquirer | Acquirer Type | Consideration | Source |
|---|---|---|---|---|---|
| May 2026 | Total Fire Safety | Complii (Ansor) | PE Bolt-on | Undisclosed | [1] |
| Apr 2026 | Parr Fire Protection Services | Complii (Ansor) | PE Bolt-on | Undisclosed | [2] |
| Feb 2026 | Passive Fire Safety Solutions | Preventr (Tandy Ventures) | PE Bolt-on | Undisclosed | [5] |
| Jan 2026 | Fire Doors Rite | IDSL Group (LDC) | PE Bolt-on | Undisclosed | [3] |
| Dec 2025 | Capital Fire Doors | Complii (Ansor) | PE Bolt-on | Undisclosed | [6] |
| Nov 2024 | Hartland Fire | IDSL Group (LDC) | PE Bolt-on | Undisclosed | [3] |
| Mar 2024 | Checkmate Fire | IK Partners | PE Platform | Undisclosed | [4] |
What this table says when read together
The UK passive fire protection market is experiencing highly targeted consolidation, driven by multi-discipline compliance groups and specialist fire door/compartmentation platforms. Complii (formerly Compliance Group, backed by Ansor) has been exceptionally active, acquiring Total Fire Safety, Parr Fire Protection, and Capital Fire Doors in rapid succession to build out its passive capabilities. IDSL Group, backed by LDC, is executing a similar buy-and-build strategy focused heavily on fire doors and inspection services, acquiring Fire Doors Rite to bolster its £51 million revenue base. Deal values in this niche are almost universally undisclosed, reflecting the private nature of the lower mid-market and the complex liability and PI insurance negotiations that often heavily structure the final consideration.
Valuation & Business Optimisation Report For owners 12 to 36 months from a sale, we build a detailed valuation and business optimisation report that typically identifies six to seven figures of additional value. A few thousand pounds standalone, or included free as part of our sell-side advisory if you are planning a sale in the next 12 months. Book a discovery call to learn more.
United States Transactions (2025–2026)
| Date | Target | Acquirer | Acquirer Type | Consideration | Source |
|---|---|---|---|---|---|
| Dec 2025 | Guardian Fire Services | Investcorp | PE Platform | Undisclosed | [7] |
| 2022 | Fire Door Solutions | Barrier Companies | PE Bolt-on | Undisclosed | [8] |
| 2022 | United Fire Door Inspection | Barrier Companies | PE Bolt-on | Undisclosed | [8] |
What this table says when read together
In the United States, passive fire protection is less frequently treated as a standalone acquisition category compared to the UK. Major consolidators like Pye-Barker, APi Group, and Summit Companies acquire broadly across active and passive fire, integrating firestopping and fire door inspection into wider life safety portfolios. However, specialist consolidators do exist, such as Lincolnshire Management's Barrier Companies, which has executed a targeted roll-up of fire door compliance businesses. The recent platform acquisition of Guardian Fire Services by Investcorp in December 2025 highlights continued private equity appetite for broad-based fire and life safety assets with strong compliance-driven recurring revenue.
Demand Drivers and Consolidation Map
Buyers do not pay premium multiples because a sector is pleasant; they pay because demand is contractual, statutory or structural. This trade currently has all three, and each driver below is verified against a primary source as of July 2026.
- June 2022 (UK): The Defective Premises Act 1972 was amended by the Building Safety Act, extending the limitation period for claims relating to defective work on dwellings to 30 years retrospectively (for work completed prior to 28 June 2022) and 15 years prospectively. This is the single most critical liability factor in UK passive fire M&A [9].
- January 2026 (UK): The Building Safety Regulator (BSR) became a standalone non-departmental public body sponsored by MHCLG, having moved out of the HSE. The BSR enforces the Gateway regime for higher-risk buildings, placing passive fire protection squarely on the critical path of major projects [10].
- June 2026 (UK): MHCLG data confirmed 4,469 residential buildings over 11 metres identified with unsafe cladding. Of these, only 1,681 (38%) have completed remediation, leaving a substantial, quantified, but finite multi-year runway for remediation contractors [11].
- Ongoing (US): FM 4991 (Standard for Approval of Firestop Contractors) and the UL Qualified Firestop Contractor Program remain the critical commercial gates for US contractors bidding on major healthcare, commercial, and institutional projects.
The consolidation map: who is actually buying
United Kingdom Acquirers
- Complii: Backed by Ansor Capital; aggressive roll-up across fire doors and passive fire.
- IDSL Group: LDC-backed; £51M+ revenue compliance platform.
- Checkmate Fire: Backed by IK Partners; major platform in compartmentation.
- Preventr: Backed by Tandy Ventures; acquiring regional passive fire specialists.
- PTSG: Backed by Macquarie and Warburg Pincus; operates NEO Property Solutions.
- Ranger Fire & Security: Inflexion-backed; acquiring broadly across fire and security.
United States Acquirers
- Barrier Companies: Backed by Lincolnshire Management; specialist fire door roll-up.
- APi Group: Listed (NYSE: APG); broad life safety consolidator.
- Pye-Barker Fire & Safety: Altas Partners-backed; integrates passive into wider portfolio.
- Summit Companies: BDT & MSD Partners-backed; broad fire protection platform.
- Guardian Fire Services: Investcorp-backed; platform acquisition December 2025.
- TopBuild / TruTeam: Listed (NYSE: BLD); major commercial fireproofing division.
What kills the multiple
The factor framework above describes the upside. This section is the mirror image: the six findings that most reliably cut offers in this trade, written as the buyer's investment committee actually reasons.
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"The earnings are 90% cladding remediation." "Buyers know the government-funded remediation pulse is finite. If you have no structural survey or maintenance revenue underneath it, they are buying a runway, not a sustainable business, and the multiple will plummet. We price the remediation book as cyclical volume, not an annuity."
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"Our PI insurance has a total fire safety exclusion." "The UK construction PI market has applied severe fire safety exclusions since late 2019. If your cover is heavily restricted, you carry uninsured risk that a buyer will not inherit without massive warranty escrows or a severe price chip. A business without adequate PI cover is functionally un-acquirable at a premium."
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"We don't have company-level FIRAS certification." "If your ability to bid work relies on the personal qualifications of a departing founder or a handful of subcontractors, the buyer is acquiring a business that could lose its licence to operate overnight. We will not pay for revenue that evaporates when a key employee leaves."
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"We didn't keep digital records of our 2018 installations." "Under the 30-year retrospective limitation of the Defective Premises Act, buyers assume historic liability. Without a digital golden thread to prove the work was compliant, the buyer must price in the risk of future claims. Every undocumented installation is a potential liability."
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"We only do new-build subcontracting." "New-build work carries main-contractor payment risk, retentions, and cyclical exposure. It is the lowest quality of earnings in the sector and will not attract a premium compliance multiple. We discount heavily for backlog risk."
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"The operatives are all agency labour." "Buyers want a stable, trained, and directly employed workforce to ensure quality control. Heavy reliance on transient subcontractors destroys the margin and creates unacceptable installation risk. It also signals a weak company culture."
Deal Structure by Size
The multiple sets the headline; the structure decides what you bank, and when. As businesses grow, the structure of the transaction changes.
The Defective Premises Act's 30-year retrospective limitation period dominates deal structuring in the UK passive fire sector. Because acquirers inherit exposure on work completed decades ago, transactions are heavily structured to allocate this risk.
In sub-£2 million EBITDA deals, asset purchases are common to leave historic liabilities behind with the corporate shell. Where share sales occur, buyers demand extensive warranties, significant cash retentions held in escrow, and strong run-off insurance cover. Above £3 million EBITDA, where the business acts as a platform, structures frequently require the founders to roll over a portion of their equity into the acquiring vehicle, ensuring they remain financially aligned with the long-term performance and liability profile of the historic installation book.
| Feature | United Kingdom | United States |
|---|---|---|
| Market Maturity | Highly active, driven by post-Grenfell legislation | Steady consolidation, often absorbed into wider fire/life safety |
| Primary Driver | Building Safety Act, Defective Premises Act | IBC, State/Local Fire Codes |
| Key Certifications | FIRAS, IFC, LPS 1531 | UL Qualified Contractor, FM 4991 |
| Deal Mechanics | Escrows and strong warranties near-universal | Completion accounts common; RWI utilised on larger deals |
Three implications for a UK owner:
- UK buyers place immense focus on historic installation records and PI insurance history due to the 30-year retrospective liability under the Defective Premises Act. Clean records transfer value; missing records destroy it.
- The UK market distinguishes sharply between finite remediation contractors and structural maintenance/survey businesses, pricing them on entirely different curves. A balanced mix is essential for a premium valuation.
- In the US, passive fire capabilities are often acquired as strategic bolt-ons by active fire (sprinkler/alarm) consolidators looking to offer a complete life safety suite, rather than by pure-play passive fire platforms.
Listed Comparables
Data retrieved August 2026. Public company multiples are sentiment markers only. There is no direct read-across from these figures to private lower mid-market transactions.
- Light Science Technologies Holdings (LSE: LSTH): Acquired the patented Injectaclad cavity fire barrier technology in April 2026 to strengthen its growing passive fire protection division, demonstrating public market appetite for scalable remediation technologies [12].
- PTSG (Premier Technical Services Group): Previously AIM-listed before being taken private, PTSG operates a significant passive fire services division (NEO Property Solutions) alongside its wider compliance offerings.
- TopBuild Corp (NYSE: BLD): While primarily an insulation installer, TopBuild's TruTeam division handles significant commercial fireproofing and firestopping in the US, trading on broad construction and specialty contractor sentiment.
FAQ
What is the average EBITDA multiple for a passive fire protection business? A passive fire contractor generating £1 million to £2 million in defended EBITDA typically sells for 5.5x to 8.0x. Smaller businesses (£500K to £1M) generally trade at 4.0x to 5.5x, while larger regional platforms (£3M to £5M) command 7.0x to 9.0x.
How does cladding remediation revenue affect the valuation? Remediation revenue is a finite demand pulse. Buyers discount businesses heavily reliant on cladding or compartmentation remediation because the revenue has a visible end date. Businesses with a high mix of recurring survey and fire door maintenance work achieve much higher multiples.
What size passive fire business do private equity firms buy? Private equity platforms typically seek bolt-on acquisitions with at least £500K to £1 million in EBITDA. For a new standalone platform investment, they generally look for businesses generating £2.5 million to £5M+ in EBITDA.
Glossary
- Defended EBITDA: The sustainable operating profit of the business after adjusting for owner compensation and non-recurring items.
- FIRAS: A leading UK third-party certification scheme for installers of passive fire protection systems.
- Golden Thread: The digitally stored, accurate, and up-to-date information required by the Building Safety Act to manage building safety across its lifecycle.
- HRB: Higher-Risk Building. Typically defined in the UK as a building at least 18 metres in height or with at least seven storeys containing at least two residential units.
- Pulse Revenue: Short-term, high-value revenue generated by finite remediation programmes, as opposed to structural, recurring maintenance revenue.
- FM 4991: The US Standard for the Approval of Firestop Contractors, a critical commercial credential.
Methodology and Sources
DealFlowAgent compiles valuation data through continuous tracking of lower mid-market M&A activity in the UK and US. Our multiples are triangulated from disclosed transaction terms, published corporate finance sector reports, listed company filings, government remediation statistics, and direct engagement with active acquirers in the fire and life safety sector.
About DealFlowAgent
DealFlowAgent is a specialist sell-side M&A advisory firm protecting the legacies of owner-led businesses. We connect owners of building services, facilities management, and healthcare companies with a pre-qualified network of strategic acquirers and private equity sponsors.
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Related Guides
- Fire Safety Valuation Guide
- Fire Sprinkler & Suppression Valuation Guide
- HVAC Valuation Guide
- Electrical Valuation Guide
- Security Systems Valuation Guide
Disclaimer: This guide provides general market information and does not constitute financial or legal advice. Every business is unique, and valuations depend on specific operational and financial circumstances.
References
[1] Complii, "Total Fire Safety joins Complii, strengthening its passive fire protection offering", May 2026. [2] Complii, "Complii acquires Parr Fire Protection Services, marking its 19th acquisition", April 2026. [3] Fire Door Journal, "IDSL Group welcomes Fire Doors Rite, strengthening UK leadership in fire door compliance", February 2026. [4] IK Partners, "IK Partners to invest in Checkmate Fire", March 2024. [5] International Fire and Safety Journal, "Preventr fire protection group secures £10m expansion funding", February 2026. [6] Facilitate Magazine, "Complii buys Capital Fire Doors to boost UK operations", December 2025. [7] Investcorp, "Investcorp Acquires Guardian Fire Services", December 2025. [8] Lincolnshire Management, "Lincolnshire Management Portfolio Company Barrier Companies Acquires Pair of Fire and Safety Compliance Businesses", July 2022. [9] Penningtons Manches Cooper, "Navigating building and fire safety claims - The Defective Premises Act", June 2025. [10] UK Government, Building Safety Regulator transition documentation, January 2026. [11] MHCLG, "Building Safety Remediation: monthly data release - June 2026", July 2026. [12] Light Science Technologies Holdings, "Strengthening our Passive Fire Protection division with Injectaclad acquisition", March 2026. [13] Dealsuite, "UK & Ireland SME M&A Report", H2 2025.
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