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The construction contractor — whether a JCT-form general contractor, an NEC4 framework contractor, a specialist trade contractor or a design-and-construct principal contractor — carries the longest-tail liability profile in the UK commercial economy. The combination of contractual liability under building contracts that frequently extend 12 to 25 years post-practical completion, latent defects in built work that routinely manifest 5 to 20 years after handover, the Defective Premises Act 1972 as comprehensively re-cast by the Building Safety Act 2022 (with a 30-year retrospective period for dwellings), the collateral warranty universe granting direct rights to funders, purchasers, tenants and the employer, and the post-Grenfell regulatory environment for higher-risk buildings, creates a run-off problem that no other commercial sector faces in comparable form.
This guide addresses the construction contractor’s run-off question — when the contractor closes, what cover continues, what additional cover is needed, and how long the residual exposure runs. It complements (and is distinct from) the design-and-construct contractor PI run-off guide in the sibling PI-side deep-dives.
General guidance only — your specific circumstances require specialist advice. Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority, FRN 724952.
A general contractor closing in 2026 carries five separate streams of residual liability arising from its trading period.
First, contractual liability under each live building contract. JCT Standard Building Contract 2016, JCT Design and Build 2016, NEC4 Engineering and Construction Contract — each contains express terms governing the contractor’s obligations post-practical completion. The defects liability period (typically 12 months under JCT, 6 months to 2 years under NEC) is followed by the limitation period for breach of contract. For contracts executed as deeds, the limitation period under section 8 of the Limitation Act 1980 is 12 years from breach.
Second, common-law negligence liability. Parallel exposure in tort for property damage and (more limited) economic loss. Generally co-terminus with contract limitation but with section 14A latent damage extension for negligence claims.
Third, Defective Premises Act 1972 section 1 liability for dwellings. The contractor’s statutory duty to “see that the work which he takes on is done in a workmanlike or, as the case may be, professional manner, with proper materials and so that as regards that work the dwelling will be fit for habitation when completed.” The duty is owed to “every person who acquires an interest” in the dwelling. The Building Safety Act 2022 section 135 amended the limitation period for section 1 claims: 15 years prospective from completion, 30 years retrospective for causes of action accrued before 28 June 2022. This is the single most consequential change in UK construction liability law in a generation.
Fourth, collateral warranty liability. Each collateral warranty granted by the contractor to a funder, purchaser, tenant or employer is a direct contract giving the beneficiary independent rights. The contractor’s PI cover obligation, the limitation period, the assignment provisions and the no-greater-duty clause are all collateral warranty drafting questions. The warranty universe on a typical large project can run to dozens of separate beneficiaries.
Fifth, Building Safety Act 2022 regulatory exposure. For higher-risk buildings (residential buildings of 18m+ or 7+ storeys with at least two residential units), the BSA creates a parallel regulatory framework including remediation orders, remediation contribution orders, and the Building Safety Regulator’s enforcement powers. Liability under the BSA regime is separate from civil liability and may extend beyond the conventional limitation periods.
The contractor at closure typically holds the following relevant covers:
Public liability and products liability. Occurrence-based. Historic incidents on completed projects remain covered by historic policies.
Employers’ liability. Occurrence-based. ELTO register submission essential.
Contractor’s all risks (CAR). Project-specific; ends with project completion.
Professional indemnity. Claims-made. Critical for any contractor with design responsibility — in-house design, novated consultant, sub-consultant design management. The PI run-off question is the central commercial decision.
Directors’ and officers’. Claims-made; bind run-off.
Latent defects insurance (LDI). Project-specific; remains in force for its period regardless of contractor closure (typically 10–12 years post-PC for new residential).
Construction contractor PI run-off differs from other commercial PI run-off in three dimensions.
Period. A solicitor’s run-off typically runs 6 years (the SRA MTC framework). An architect’s run-off runs 6–15 years depending on the deed and DPA position. A contractor’s run-off for any business with dwelling exposure now runs 15 years as a working floor post-BSA 2022.
Limit. Aggregate run-off limits across 12–15 years are operationally different from annual limits. A single major cladding claim can exhaust a £10m aggregate run-off limit, leaving subsequent claims uninsured.
Market. The number of insurers willing to write contractor PI run-off has reduced materially since 2019. For any contractor with cladding or high-rise residential exposure, the market is restricted; pricing has hardened; and exclusions are common.
The BSA 2022 is the dominant new exposure for construction contractor run-off. Three of its provisions are central.
Section 135 — limitation period for DPA 1972 section 1 claims. Extends the limitation period for DPA section 1 claims to 15 years prospective from completion (replacing the previous 6-year period) and creates a 30-year retrospective period for causes of action that had accrued by 28 June 2022. The retrospective period revives claims that would otherwise have been time-barred under the 6-year period.
The practical effect: a contractor that completed a residential project in 2010 could face claims arising from defective work until 2040 (the 30-year retrospective window). A contractor completing a residential project in 2026 will face claims until 2041 (15 years prospective).
Sections 116–125 — remediation orders and contributions. The First-tier Tribunal can make remediation orders requiring landlords to remediate relevant defects in higher-risk buildings, and remediation contribution orders requiring associated persons (including contractors and others involved in the construction) to contribute to remediation costs. Liability extends beyond the conventional limitation framework. Insurance treatment of remediation contribution orders is still developing; many cyber-era PI wordings did not contemplate this exposure.
Sections 144–154 — Building Safety Regulator enforcement. The BSR has powers over higher-risk buildings during occupation, including improvement notices, prohibition notices, and prosecution for relevant offences. Director-level criminal liability is a frequent risk in BSR enforcement.
The cladding context. The post-Grenfell cladding remediation programme has generated sustained claim activity against contractors involved in cladding installation, façade construction, and external wall systems. Government funding (the Building Safety Fund and the Cladding Safety Scheme) addresses many claims but contractor liability remains in many cases, particularly where the building does not qualify for state funding.
Collateral warranties granted by contractors typically include:
The express obligations. Mirror the building contract: to perform in accordance with the contract, to exercise skill and care, to use materials of merchantable quality.
The no-greater-duty clause. The contractor’s liability to the warranty beneficiary is not greater than to the original employer. This protects the contractor from disproportionate aggregate exposure.
The PI maintenance clause. Requires the contractor to maintain PI cover for a defined period — typically 12 years post-practical completion. Failure exposes the contractor to breach-of-warranty claims.
Assignment provisions. Typically permit assignment by the beneficiary to successors-in-title, often once or twice without consent. The warranty universe can therefore extend beyond the original named beneficiaries over time.
Limitation. Deed-executed warranties carry 12-year limitation; under-hand warranties 6-year limitation.
For a contractor at closure, the warranty universe must be mapped. Each warranty’s PI maintenance clause defines the contractor’s binding obligation to maintain run-off for the warranty period.
A regional D&B contractor in the North West, 65 employees, £42m turnover, decides to wind up in 2026 after losing a key framework. The contractor’s recent project portfolio includes:
The PI run-off analysis:
Period. The residential exposure requires 15 years as a working floor (BSA 2022 section 135 prospective period). The earliest 2018 residential completion means cover needs to run to 2033 at minimum for the section 1 / BSA prospective period. The 30-year retrospective period for accrued causes of action could in principle extend exposure to 2048 for the 2018 completions, though the retrospective period covers causes of action accrued by June 2022 — by 2026 with 4-8 years’ use of the buildings, most accrued causes of action would have manifested. The practical floor: 15 years from latest residential completion (2024) = 2039.
Limit. Aggregate £10m over 15 years would be modest given the residential exposure. £15m–£25m is more defensible.
Cost. 15-year run-off for a D&B contractor with material dwelling exposure: 6.5x–9.0x last annual premium typically, before considering claims history. The contractor’s last annual PI premium was £180k; the run-off cost is therefore in the £1.2m–£1.6m range as a single premium.
Cladding history. If any of the residential schemes involved cladding remediation work, the position hardens substantially. Some insurers will not write cladding-exposed run-off at any price; others will write with cladding-specific sub-limits or exclusions.
D&O run-off. £8k annual D&O × 4.5x = £36k for 6 years. Modest by comparison.
Other run-off. Crime extended discovery £4k; cyber ERP £18k; EIL run-off £15k.
Total run-off cost. Approximately £1.3m–£1.7m, dominated by the PI run-off.
For a £42m turnover contractor closing after profitable trading, this is a defensible cost. For an insolvent closure, the cost is typically unaffordable from the estate and personal exposure of the directors becomes the focus.
For D&C contractors, the post-novation problem is the dominant PI run-off issue. The novated consultant’s design liability is inherited by the contractor at novation. The contractor’s PI policy must respond.
The novation mechanic. A tripartite deed (employer, consultant, contractor) novates the consultant’s appointment with the employer to the contractor at the building contract date. The contractor becomes the principal contractual counterparty for the design.
The contractor PI scope. The contractor’s PI policy schedule should explicitly include in-house design, novated consultant design management, and sub-consultant design supervision.
The consultant’s continuing PI. The novated consultant’s own PI continues to respond to claims against the consultant directly. The contractor’s PI responds to claims against the contractor (including for the consultant’s work as novated).
Run-off coordination. At closure of the contractor, the contractor’s PI run-off must cover the novated design exposure. The consultant’s own PI is independent; the contractor cannot rely on it.
Indicative contractor PI run-off pricing in 2026:
Principal drivers: dwelling work as percentage of completed-project value; cladding and external wall history; HRB history; claims and notification history; design scope (D&C, design-portion or construction-only).
A contractor whose work is alleged to be defective in a higher-risk building may face a remediation contribution order under BSA 2022 section 124. The order requires associated persons to contribute to remediation costs.
The cover question. Modern PI wordings now typically include cover for “any sum the insured is legally obliged to pay arising from a breach of professional duty in the conduct of the insured’s professional services” — wording that captures RCO exposure where the underlying breach is a professional failure. Older wordings may not. Cyber-related and discrete-event wordings (the LMA cyber and silent-cyber series) may exclude.
Pre-renewal review. Contractors approaching closure should specifically review the RCO treatment in the existing PI policy and the proposed run-off binder.
For UK construction contractors:
Begin the run-off conversation 18 months before planned closure. The market is restricted, pricing is hardening, and submission preparation requires substantial effort.
Map the residential exposure: completion dates, unit counts, cladding type, height, BSA HRB classification. This is the underwriter’s first question.
Map the collateral warranty universe by project: beneficiaries, PI maintenance clauses, deed/under-hand, assignment provisions.
Set the run-off limit by reference to credible single-project worst-case exposure. A 480-unit apartment block cladding remediation cost can reach £20m+; a £10m aggregate is inadequate for any contractor with material residential exposure.
Consider sub-limits and exclusions carefully. Cladding sub-limits are common; understand the trade-off between premium and exposure.
For D&C contractors, ensure the run-off explicitly covers novated design liability.
Maintain the documentation infrastructure: project files, building contract copies, collateral warranty register, design records, post-completion correspondence. The run-off claim handling in year 14 depends on the documentation.
Establish a single post-closure contact for run-off claims. The relationship matters more than the contract for difficult claims.
For directors: bind personal D&O run-off independent of the company position. The BSR regulatory enforcement environment is severe.
Q1. Can I bind contractor PI run-off after I’ve closed? Generally no. The run-off must be bound at or before cessation. Late-binding markets exist but at premium.
Q2. What if my historic PI policy covered the project but I’ve changed insurers since? The historic policy is the one that responds to a circumstance notified during its currency. For claims-made-and-notified policies, the trigger is the date of notification, not the date of the underlying work. The current run-off policy responds to claims first made during the run-off period.
Q3. Does my main contractor PI cover sub-contractor work? Typically yes for sub-consultant design management. For sub-contractor construction defects, the public liability and products liability are the principal covers; sub-contractor’s own insurance is the primary recovery for sub-contractor errors.
Q4. What about completed buildings I worked on 15 years ago? Historic policies in force at the time of notification respond. The BSA 30-year retrospective period revives previously time-barred claims; the historic insurer’s position on such revived claims is a complex coverage question.
Q5. Will my historic insurer still be around? This is the residual market risk. Most major UK PI insurers maintain stable identity. Smaller specialist insurers may have exited or been acquired; the policy follows in any portfolio transfer. The FSCS protection applies to authorised UK insurers that default.
Q6. Does run-off cover criminal proceedings against directors? D&O run-off typically covers defence costs subject to the conduct exclusion (no cover for proven fraud). Criminal fines are uninsurable. Defence costs response is the primary value.
Q7. What’s the BSA 2022 remediation order exposure in practice? For HRB-classified buildings (18m+ or 7+ storeys with residential), substantial. For lower-rise residential, lesser but real. Specialist legal advice essential.
Q8. Can I rely on parent company guarantees instead of run-off? Parent guarantees protect the named beneficiary; they do not provide insurance protection to the contractor directly. The contractor’s own residual exposure remains. Parent guarantees are usually a complement to insurance, not a substitute.
Q9. What about projects I worked on before the LDI was bought? LDI (latent defects insurance) bought by the developer protects the developer/beneficiary, not the contractor. Contractor exposure under the building contract is independent.
Q10. How long do I keep insurance documents? At least 30 years for any work involving dwellings post-BSA. The exposure window is now genuinely multi-decade.
Defective Premises Act 1972 section 1 (as amended by Building Safety Act 2022 section 135). Building Safety Act 2022, especially sections 116–125 (remediation orders), 124 (remediation contribution orders), 135 (limitation), 144–154 (BSR enforcement). Limitation Act 1980, sections 5 (simple contract), 8 (deed), 11A (defective product), 14A (latent damage), 32 (concealment). Consumer Protection Act 1987. JCT Standard Building Contract 2016 — clause 6.11 (PI cover). JCT Design and Build 2016 — clause 6.11. NEC4 Engineering and Construction Contract — Option X18. Hill v Tupper and the latent defects line of authority. Murphy v Brentwood District Council [1991] 1 AC 398 (pure economic loss in tort). Robinson v PE Jones (Contractors) Ltd [2011] EWCA Civ 9 (DPA section 1). URS Corporation Ltd v BDW Trading Ltd [2023] EWCA Civ 772 (BSA 2022 application). Grenfell Tower Inquiry reports (Phase 1 and Phase 2). Building Safety Fund and Cladding Safety Scheme guidance.
Index: Commercial Run-Off Deep-Dives Deep-Dive 1: Commercial run-off architectural overview Deep-Dive 3: Manufacturer product liability run-off Deep-Dive 4: D&O run-off after dissolution PI-side run-off Deep-Dive 7: D&C contractor PI run-off — the PI-side companion piece focusing specifically on consultant-novation D&C exposure.
Disclaimer: General guidance only. Specific cessation and insurance decisions require specialist advice. Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority, FRN 724952.
Apex Insurance Brokers serves UK professional services firms and commercial businesses. Call 0117 325 0027, email hello@apexinsurancebrokers.co.uk, or request a quotation.
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