The biggest single change for building surveyors since Grenfell is not the Building Safety Act itself — it is the assumption that a survey opinion written in 2008 will be read, in court, against the law and the standards of 2026.
Building surveyors sit at an unusually exposed intersection. They write opinions that mortgage lenders, leaseholders, freeholders and developers all rely on. They sign EWS1 forms. They inspect post-completion. They issue dilapidation schedules and condition surveys. Each of those work products can now feed into a Defective Premises Act 1972 claim running on a thirty-year retrospective tail under section 135 of the Building Safety Act 2022. The PI market has reacted with fire safety exclusions, tightened aggregates and aggressive scrutiny of historic dwelling work. This guide sets out what the Act actually does to a surveying practice’s exposure, how the RICS Minimum Approved Wording responds, and the single biggest trap on changing insurer.
A building surveyor’s PI claims profile has historically been dominated by valuation disputes, missed defects on Homebuyer reports, and boundary or dilapidation arguments. Post-Grenfell, fire safety opinions and external wall assessments have become a distinct and increasingly dominant category. EWS1 forms — designed as a short-term mortgage liquidity fix in 2019 — became a long-tail liability creator the moment surveyors started signing them in volume.
The Building Safety Act 2022 sharpened that exposure in three ways relevant to surveyors. Section 135 extended the Defective Premises Act 1972 limitation period to thirty years retrospective and fifteen years prospective. That captures any survey work done on a dwelling — not just on a Higher-Risk Building — where the surveyor’s opinion contributed to a property being unfit for habitation when completed or remediated. Section 130 building liability orders allow associated companies to be drawn in where the named defendant is insolvent, which matters to multi-entity surveying groups. The Higher-Risk Buildings regime imposes specific duties on those acting as the BSA Principal Designer or carrying out building control functions, with a separate competence framework.
Most practising surveyors will not sit as BSA Principal Designer. But many sit on the periphery — undertaking pre-purchase due diligence on residential blocks, condition surveys on housing stock, advising freeholders on remediation contractor selection, certifying remediation completion. Each of those tasks can become a Defective Premises Act 1972 claim if the underlying scheme is later found to have been unfit for habitation. RICS members continue to be bound by the RICS Rules of Conduct and the obligation to carry PI cover compliant with the RICS Minimum Approved Wording.
RICS-regulated surveying firms must hold PI insurance compliant with the RICS Professional Indemnity Insurance Minimum Approved Wording. The minimum wording requires civil liability cover, each-and-every claim limits at a level set by the firm’s fee income band, defence costs in addition to the limit, and run-off cover for six years after cessation. The minimum wording also constrains how insurers can write fire safety and cladding cutbacks — but it does not eliminate them, and recent RICS amendments have allowed defined fire safety aggregation provided the aggregate is not below the otherwise-applicable each-and-every limit.
For a Defective Premises Act 1972 claim arising from a 2009 EWS1 or a 2014 condition survey, the policy that responds is the policy in force when the claim is first made against the firm — subject to continuous cover and proper notification of any prior known circumstances. That makes the retroactive date the most important single number on the schedule.
Three policy mechanics matter:
A circumstance must be notified under the policy as soon as the insured is aware of it; failure to do so engages section 3 of the Insurance Act 2015 at the next renewal and, more practically, can block the relevant year’s policy from responding.
A surveying practice — six partners, residential and commercial split roughly 60/40 — signed twelve EWS1 forms between 2019 and 2021 on mid-rise blocks in two cities. In 2025 a leaseholder action consortium serves pre-action correspondence on three of those blocks, arguing the EWS1 assessments were negligent and that the assessor should have escalated to a full intrusive survey. The aggregate quantum across the three blocks is pleaded at £2.6m, with associated costs.
The practice has £5m each-and-every with defence costs in addition, retroactive date 1999. The current policy responds. But the wording includes a fire safety aggregate sub-limit of £3m. The three blocks are arguably one “related matters or transactions” claim, which would aggregate to one occurrence — favourable here because it leaves £2m of fire safety aggregate for the rest of the year. Defence costs run at £400,000 in year one, sitting outside the limit. The practice’s broker confirms aggregation position with the insurer in writing before settlement to avoid an argument later that each block is a separate claim eroding the aggregate three times.
Start fourteen weeks out. Build a clear historic exposure map: every dwelling-related instruction by decade, every EWS1 signed by year, and every remediation advisory engagement. Reconcile that to your circumstance log. If there is any pending remediation dispute, notify it before the renewal date so it falls on the current policy rather than the renewed one.
Push your broker to test the market on three specific points: the definition of the fire safety exclusion, whether the aggregate sub-limit is necessary at the proposed quantum, and the retroactive date on any switch quote. A new insurer offering competitive premium with a retroactive date set at inception is not a competitive quote — it is a different product. Get any retroactive date confirmation in writing on the schedule, not just in covering correspondence.
Review run-off pricing now, even if you are not planning to wind down. Run-off quotes give you a market signal on how insurers see the tail on your book. If the run-off quote is more than two-and-a-half times your in-force premium, the market is pricing a real concern. That is information you can use commercially.
Apex’s view: We see more surveying firms damaged by the retroactive-date trap on insurer switches than by any other single mechanic. The lower premium looks like a win until a 2012 EWS1 lands as a 2027 claim and the new policy declines it. We continue to advise that any switch of construction PI insurer must be tested against a written retroactive date confirmation matching the firm’s true start of dwelling work, and that the broker present the schedule extract to the partner who signs the order, not just to the office manager who pays it. On the fire safety wording itself, the market is still inconsistent — push the broker to negotiate the definition, not just the price.
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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