A four-partner chartered quantity surveying practice in the South West is appointed as PQS on a mixed-use scheme — fifty-eight apartments above ground-floor retail, gross development value just under £19m. The practice prepares the cost plan at RIBA Stage 3, advises on procurement, drafts tender documentation under JCT Design and Build 2024 and administers the contract on behalf of the employer. Eighteen months after practical completion the developer's accountants reconcile the final account and conclude the project has overrun by £1.6m against the Stage 4 cost plan. The developer's solicitors write to the QS practice alleging negligent cost estimation, inadequate contingency provision, and a failure to advise on the inflationary risk inherent in a fixed-price contract let in a volatile materials market. The claim is pleaded at £1.6m plus interest plus costs.
That letter, eighteen months after sign-off, is the kind of claim that defines quantity surveyors' Professional Indemnity Insurance in 2026. Whether the policy responds — and whether the firm survives a contested two-year defence — depends on the cover in force when the matter is notified, the wording of the RICS-approved policy, the documentation in the cost-plan working papers, and the choices the firm made about limit, excess and aggregation when it last renewed.
This guide is for principals, partners and directors at UK quantity surveying practices — chartered PQS firms, contractor's QS departments operated as separate legal entities, cost consultants, employer's agents, project managers who hold themselves out as competent in cost control, and the multi-disciplinary practices that combine quantity surveying with project management, contract administration or building surveying. It explains what PI insurance is doing for a QS firm in 2026, what RICS expects under its minimum terms, where the contractual framework of JCT and NEC4 generates exposure, and where the decisions at renewal matter.
What Professional Indemnity Insurance covers for quantity surveyors
Professional Indemnity Insurance — usually written as PI or PII — pays the legal costs of defending a civil claim brought against your firm by a client or third party alleging financial loss arising from your professional services, and pays any damages or settlement awarded against you up to the limit of indemnity. QS PI is written on a claims-made basis: the policy that responds is the one in force at the date the claim or circumstance is first notified, not the policy in force when the work was carried out. Continuity of cover, the retroactive date and run-off arrangements therefore sit at the centre of whether a claim is ever paid.
For a quantity surveying practice "professional services" is a broad envelope — feasibility studies and order-of-cost estimates, cost planning across the RIBA stages, procurement advice, preparation of bills of quantities and pricing documents, tender analysis, contract administration as employer's agent, contract administrator or project manager, interim and final valuations, change control and variation pricing, loss-and-expense assessment, final account negotiation, contractual claim preparation, post-contract cost control, expert witness work in adjudication and litigation, dispute support, and life-cycle cost analysis. Where the QS holds itself out as competent in adjacent disciplines — building surveying, project management, party wall, sustainability assessment — those activities form part of the insured envelope provided the policy schedule contemplates them.
The product does not cover the QS firm's own fee disputes (in most policies, save for defence costs in certain wordings), regulatory fines and penalties imposed by RICS or any other body, dishonesty or fraud by partners or directors, work outside the firm's defined professional activities, or — critically for quantity surveyors administering JCT and NEC4 contracts — contractually-assumed liabilities exceeding the duty of reasonable skill and care. The last is the area where many QS practices find themselves carrying obligations the policy will not respond to.
RICS and the regulatory framework
Quantity surveying in the UK sits within the Royal Institution of Chartered Surveyors. Unlike engineers — where no single statutory regulator mandates PI — the RICS regime is prescriptive and binding on every firm regulated by the Institution. A QS practice carrying RICS regulation must hold PI cover that complies with the RICS Minimum Terms in force from time to time, on a wording approved by RICS, placed with an RICS-listed insurer.
The current RICS Minimum Terms (the 2024 schedule, as updated) set the floor. The per-claim minimum limit is tiered by the firm's preceding year fee income: smaller firms (income up to £100,000) require a £250,000 minimum limit; mid-sized firms (£100,001 to £200,000) £500,000; firms above £200,001 require £1,000,000 as a floor. These are absolute floors, not target levels — every firm should size cover by reference to the worst-case exposure on its actual portfolio, with the minimums treated as the regulatory baseline below which the firm cannot fall.
The minimum terms also dictate the policy excess. Excess is capped relative to fee income — the cap rises with firm size, but is set such that the excess cannot become a back-door dilution of the floor cover. Aggregation under the minimum terms is on an "each and every claim" basis for the primary tower (separately from any aggregate limits on cladding, fire-safety or specified exclusions). Notification provisions, fraud exclusions, run-off requirements for sole principals (uncapped run-off; on death or retirement, run-off for at least six years on the same terms), and the specific exclusions permitted are all set within the minimum terms — an RICS-approved wording cannot exclude them away.
The Institution publishes the list of insurers approved to write RICS-compliant PI. A wording outside the approved list will not satisfy regulation; a wording on the list but stripped back below the minimums is non-compliant. Apex works only with insurers on the RICS-approved panel for QS PI placements.
The Engineering Council and the architects' regulator do not apply to QS practice. RICS is the single, binding regulator, with the APC (Assessment of Professional Competence) — the QS & Construction pathway — the route to chartered status, and the RICS Rules of Conduct (2022, as updated) governing professional behaviour.
Beyond RICS, the contractual and statutory backdrop matters. The standard form contracts under which QS firms operate — the JCT 2024 suite (Standard Building Contract, Design and Build, Intermediate, Minor Works, Construction Management, Management Building) and NEC4 (Engineering and Construction Contract — ECC; Professional Service Contract — PSC; Term Service Contract; Short Contract variants) — define the QS role with precision. JCT typically refers to the "Quantity Surveyor" by name with specific valuation, variation and loss-and-expense duties; NEC4 ECC casts the QS most commonly as Project Manager (a defined role with significant decision-making authority) or as supplier under the PSC. The administration of these contracts is the single largest source of professional exposure for most QS firms.
The Defective Premises Act 1972, as amended by section 135 of the Building Safety Act 2022, extends to "any person taking on work for or in connection with the provision of a dwelling". The retrospective extension to 30 years for work completed before 28 June 2022, and prospective 15 years for work completed on or after, captures QS services on residential schemes where the work in question contributed to the dwelling being unfit for habitation. For pure cost-plan or contract-administration work the engagement of the DPA is narrower than for designers, but it is not zero — and the long tail it creates affects run-off decisions for QS practices that have administered residential schemes.
The Building Safety Act 2022 more broadly introduced the higher-risk-building regime (residential buildings 18m or above, or 7 storeys or more, with at least two dwellings), gateways one to three, the duty-holder regime, the principal designer and principal contractor roles, and the Building Safety Regulator within the Health and Safety Executive. QS firms are not usually duty-holders in their own right, but project-management or employer's-agent role-creep can pull a QS practice into duties it has not properly costed into its PI cover.
The Construction (Design and Management) Regulations 2015 (CDM 2015) similarly allocate duties between client, principal designer, principal contractor, designers and contractors. The QS is not a CDM duty-holder by virtue of being a QS, but a QS practice acting as project manager or employer's agent can pick up duties that flow through to the policy schedule.
The Contracts (Rights of Third Parties) Act 1999 is the alternative to a collateral warranty regime — increasingly common in employer's-agent and project-management appointments where the funder, tenant or building owner wants direct rights without a separate executed warranty. The substantive exposure is similar; the procedural mechanics differ.
What QS PI actually covers — the wording detail
A standard UK quantity surveyors' PI policy, written on an RICS-approved wording, covers civil liability arising from breach of professional duty by the insured. Two RICS-compliant policies can still respond differently in practice. The wording variables that matter most are the following.
The definition of professional services. RICS-approved wordings typically use an open definition referencing "the professional activities of a chartered surveying practice" or similar. For multi-disciplinary firms — QS plus project management, plus building surveying, plus expert witness work — the schedule and any activity-specific endorsements need to map onto what the firm actually does. Expert witness work (covered in detail in our construction expert witness PI cluster) is the activity most commonly under-declared.
The duty of care covered. Policies cover the common-law and contractual duty of reasonable skill and care. Most exclude liability assumed for fitness for purpose, performance guarantees, "best endeavours" or "fit-for-intended-purpose" standards, or any contractual standard exceeding reasonable skill and care. A QS who signs a JCT Design and Build Employer's Requirements addendum that imports fitness-for-purpose language at consultant level is signing an uninsured liability.
The retroactive date. Because the policy is claims-made, the retroactive date controls how far back the policy reaches. "Unlimited retroactive" reaches any past work; a date set at, say, 1 January 2018 excludes earlier engagements. Continuity of retroactive cover across renewals is one of the most important things the broker monitors — a switch of insurer that resets the retroactive date can strand a five-year back-catalogue.
Aggregation, defence costs, sub-limits and exclusions. Most RICS-compliant policies pay defence costs within the limit of indemnity, written on an "any one claim" basis with aggregate caps on certain categories — cladding-related claims, fire-safety claims, asbestos, pollution, and Building Safety Act-related work are commonly sub-limited or aggregated. Cost-plan claims and final-account disputes (the cost overrun cluster covers this in detail) are typically inside the main limit but the aggregate position matters where multiple matters are notified in the same year.
How much cover do you actually need?
The RICS minimum is the floor, not the target. The figure that is right for your firm depends on the size and value of the projects you take on, the contractual obligations you accept, and the warranties you give. A useful proxy: take the three largest live engagements, estimate the worst-case financial exposure if the cost-control work proved negligent, and ensure the PI limit comfortably exceeds the most exposed project with headroom for defence costs.
Indicative ranges, with the standard caveat that every firm's profile is different: a small PQS or cost consultant working on residential extensions, small commercial work and householder advice may sit at £500,000 to £1m per claim; a mid-sized chartered practice doing schools, mid-market commercial and small-to-medium residential schemes typically sits at £2m to £5m; a larger PQS or multi-disciplinary practice administering high-value commercial, healthcare, infrastructure or large residential schemes commonly carries £5m to £10m or more, often in layered programmes. Firms doing expert witness work on substantial disputes need to scale to the value of the matters they are instructed on, not just to their fee income.
The shape of the limit matters as well as the headline. An "any one claim" limit with unlimited aggregate is different from "any one claim" with an aggregate cap, which is different again from an "in the aggregate" policy where one large claim exhausts cover for the year. RICS minimum terms require "each and every" aggregation for the primary tower, but excess layers above the primary can be written aggregate-only.
Where claims come from — the recurring patterns
Working from anonymised industry patterns, quantity surveyors' PI claims cluster around the following themes.
Cost-plan and cost-estimation claims are the most common single category for PQS firms. The complaint is that the Stage 2, 3 or 4 cost plan understated the final cost, that contingency was inadequate, that risk allowances were not properly explained, or that escalation was not modelled. The defence — that the cost plan reflected reasonable skill and care at the date prepared, was based on the information then available, and was qualified by the standard assumptions — is rarely straightforward to mount once the developer's accountants have a £1m-plus delta to point to. Settlements range widely; the cost overrun cluster article covers the defence pattern in depth.
Measurement and quantity errors in bills of quantities or pricing documents — undermeasured items that result in contractor overcharging through variation, or overmeasured items leading to refund disputes — generate a steady stream of mid-five-figure to low-six-figure claims.
Valuation and certification errors under JCT or NEC4 — over-certification leading to overpayment of an insolvent contractor, under-certification leading to a contractor claim, late certification of extensions of time or loss-and-expense — are a defined exposure where the QS is named as the certifying party or holds the project manager role under NEC4.
Final account disputes between contractor and employer routinely pull the QS into proceedings where the QS prepared or agreed the final account on behalf of the employer. Where the contractor sues the employer for sums in dispute, the employer's response frequently includes a Part 20 or stand-alone claim against the QS for negligent agreement.
Contract advice and procurement claims — recommending the wrong form of contract, failing to advise on the consequences of single-stage versus two-stage tendering, missing the implications of contractor's design portion provisions — arise less often but with potentially substantial exposure.
Loss-and-expense and variation pricing claims under both JCT (clauses 4.20 to 4.26 in JCT 2024) and NEC4 (compensation events) regularly generate disputes where the QS's valuation is challenged.
Expert witness work is a distinct category covered in detail in our construction expert witness PI cluster — the QS as expert in adjudication, arbitration or TCC proceedings owes duties under CPR Part 35 and faces methodology-error allegations from the losing party.
Building Safety Act and higher-risk-building work is the newest pattern. QS firms acting as employer's agent or contract administrator on higher-risk-building projects can be drawn into gateway compliance disputes, golden-thread record-keeping allegations, and remediation cost-control claims following defect identification.
Defence costs on a contested QS PI claim typically run from low five-figures on a straightforward measurement dispute to mid-six-figures on a multi-party final-account or Building Safety Act matter. The defence-cost component alone has reshaped how the market underwrites the class — and is one of the reasons RICS minimum-term limits are floors rather than targets.
Run-off — six years, twelve, or longer
Because PI is written on a claims-made basis, the QS who has retired, sold or wound down a firm is uninsured for past work the moment the last working policy lapses, unless run-off cover is in place. Run-off is a non-renewing policy that responds to claims notified during its term arising from work done before the firm ceased — bought as a single up-front premium calculated as a multiple of the firm's last working policy premium.
The right run-off period depends on the longest open commitment in the firm's portfolio. The standard contractual limitation period is six years from the cause of action; where appointments were executed as deeds (very common on substantial commercial and infrastructure work) the period is twelve years; for residential work the Defective Premises Act 1972 as amended by section 135 BSA 2022 gives 15 years for work completed on or after 28 June 2022 and 30 years for work completed before. RICS minimum terms separately require sole principals to hold run-off on death or retirement for at least six years on the same terms as the last working policy, with the run-off period uncapped in respect of sole-principal obligations the firm took on.
A QS practice retiring in 2026 with residential employer's-agent work in its back-catalogue from the 2000s and 2010s may face the long-tail extension of the DPA in respect of work it did before its current insurance arrangements existed. Six years remains the practical floor; twelve where deed-executed appointments are routine; the longer DPA periods need to be considered where residential work is in the portfolio. Selling rather than winding down does not automatically extinguish the run-off obligation; the sale documentation must address it.
Excess
QS PI policies carry an excess (deductible) on each and every claim, payable by the firm before the policy responds. Typical figures range from £2,500 for the smallest practices to £25,000 or £50,000 for larger firms; on Building Safety Act-related or cladding-related claims the excess is often a multiple of the standard figure, sometimes set as a percentage of the loss. RICS minimum terms cap the excess relative to fee income to prevent excess inflation eroding the regulatory floor. A higher excess reduces premium but moves more of the small-claim risk to the firm — relevant for QS practices where measurement and certification disputes regularly produce claims at or near the excess level.
Collateral warranties, third-party rights and the appointment
Quantity surveying practices, particularly those acting as employer's agent or contract administrator, are increasingly asked to sign collateral warranties or to accept third-party rights provisions under the Contracts (Rights of Third Parties) Act 1999. Each warranty or third-party right is a separate exposure for the policy.
The wording matters. A warranty that imposes duties beyond reasonable skill and care, omits a net contribution clause, carries an unrestricted assignment provision, or extends to a class of beneficiaries (funders' assignees, future tenants in perpetuity) that is open-ended, materially expands exposure. Where the underlying appointment is reasonable but the warranty wording is aggressive, the warranty is the document the policy ultimately responds against. Apex's standard renewal process includes review of the firm's current warranty obligations against the policy wording.
What insurers underwrite on, and how a firm chooses cover
Underwriters pricing QS PI renewals look at fee income split by service line (PQS, contractor's QS, project management, employer's agent, expert witness); sector and project type (commercial, residential, infrastructure, healthcare, education, fit-out); the proportion of work engaging the Building Safety Act, the Defective Premises Act, cladding remediation or higher-risk buildings; the five-year claims and notifications history; the standard form appointments the firm uses (JCT, NEC4, ACE, RIBA chain or bespoke); the collateral warranty regime and any third-party-rights provisions; internal quality controls including cost-plan sign-off procedures; the proportion of expert witness work; and any compliance or RICS regulation matters.
The choice of insurer, limit, retroactive date, excess and wording is the firm's. The questions worth working through each year are whether the headline limit is adequate for the worst-case exposure with headroom for defence costs; whether the wording covers all the firm's activities — particularly any expert witness work or adjacent disciplines; whether the retroactive date is continuous with previous cover; whether cladding, fire-safety and BSA provisions match the projects the firm is taking on; whether run-off provision is adequate for the longest open commitments; whether warranty obligations are consistent with the policy's cover; and whether the insurer is financially secure and on the RICS-approved list.
How Apex helps
Apex Insurance Brokers is an independent FCA-authorised insurance broker. We act as the firm's broker, which under the Financial Conduct Authority's Conduct of Business rules means we represent the firm's interests in the negotiation with the insurance market. We are not tied to any single insurer and we do not operate quotas that would skew our recommendation. In practice that means we take the firm's renewal information, present it to insurers on the RICS-approved panel who price the particular profile sensibly, negotiate terms, explain the wording differences between quotes, and document the decision so it stands up to internal compliance review and RICS regulation monitoring. We work regularly with QS practices ranging from sole principals through to multi-partner chartered firms with substantial commercial, residential and infrastructure portfolios.
The terms on which we act are set out in our Terms of Business, our handling of personal data in our Privacy notice, and the route to raising any concerns about our service is on our Complaints page. The quantity surveyors sector page is the place to start a renewal conversation, or contact us directly. If you are within ninety days of renewal this is the moment to review the policy you currently hold and decide whether the limit, wording, retroactive date and broker relationship are doing what your firm needs; if you are mid-policy, this is the moment to make sure your file shows everything notifiable has been notified — late notification is the single most common reason an otherwise-covered claim fails to be paid.
Frequently asked questions
Is Professional Indemnity Insurance mandatory for UK quantity surveyors?
For any firm regulated by RICS, yes — PI is mandatory under the RICS Rules of Conduct, and the cover must comply with the RICS Minimum Terms in force from time to time, written on an RICS-approved wording and placed with an RICS-listed insurer. The minimum limit is tiered by fee income: £250,000 below £100,000 of income, £500,000 between £100,001 and £200,000, and £1m above. These are floors; commercial and contractual realities usually push the appropriate figure significantly higher.
How much PI cover does a quantity surveying firm actually need?
It depends on the size of the schemes the firm is engaged on and the obligations accepted. The standard test is to take the three largest live engagements and estimate worst-case financial exposure with headroom for defence costs. Indicative ranges: £500k–£1m for very small practices doing householder and minor commercial work; £2m–£5m for mid-sized chartered firms on schools, commercial fit-out and small residential; £5m–£10m or more for firms administering high-value commercial, healthcare, infrastructure or substantial residential schemes. Expert witness work scales to dispute value.
What are the RICS Minimum Terms and why do they matter?
The RICS Minimum Terms are the schedule of policy provisions that any PI cover for a RICS-regulated practice must meet. They set per-claim minimum limits tiered by fee income, cap the excess relative to income, require "each and every claim" aggregation for the primary tower, control the permitted exclusions, and set run-off obligations including the requirement for sole principals to hold run-off on death or retirement. A wording outside the minimum terms is non-compliant with RICS regulation regardless of price.
How does the Building Safety Act 2022 affect QS PI?
QS firms are not usually duty-holders under the BSA in the way principal designers and principal contractors are. The exposure is indirect — via the extended Defective Premises Act limitation period (30 years retrospective, 15 years prospective for dwellings), via employer's-agent or project-management role-creep on higher-risk buildings, and via tighter underwriting and aggregation of cladding and fire-safety work. Run-off decisions for firms with residential employer's-agent work now need to account for the longer DPA tail.
What is run-off cover and how long should I hold it?
Run-off is a non-renewing policy that responds to claims notified during its term arising from work done before the firm ceased trading. The standard limitation period is six years; deed appointments extend it to twelve; the Defective Premises Act gives 15 years for dwellings completed on or after 28 June 2022 and 30 years for work completed before. RICS minimum terms require sole principals to hold run-off for at least six years on the same terms as the last working policy. Six is the floor; twelve where deeds are routine; longer where residential exposure exists.
Does my PI cover expert witness work?
Most RICS-approved QS PI wordings cover expert witness work as part of the firm's professional activities, but the activity should be declared on the proposal form and the schedule checked. Substantial expert witness practice — particularly on high-value adjudications, arbitrations or TCC proceedings — can warrant a specific endorsement and may attract additional premium. The cluster article on construction expert witness PI covers the detail, including the CPR Part 35 framework and the position post Jones v Kaney.
What happens if I have a notified claim at renewal?
The renewal market will be tighter and pricing typically harder. Some insurers may decline to quote; others will require detailed information about the matter and the firm's response. The broker's role is to present the circumstance fairly to the RICS-approved market. Well-documented circumstances with clear remediation steps generally renew more sensibly than poorly-handled ones. Where the open market closes for a particular profile, alternative routes exist (specialist insurers, layered programmes) but terms and pricing will differ from a clean renewal.
My JCT appointment imports fitness-for-purpose language — what should I do?
Sign nothing that imposes a standard above reasonable skill and care without first checking with the broker. Most PI policies exclude liability for fitness-for-purpose, performance guarantees and absolute warranties — those obligations sit outside the cover entirely. The conversation needs to happen at the appointment stage, not after the fact. Where the client will not move from the language, the question becomes whether to walk from the engagement or accept the uninsured exposure with eyes open.
Related guides
- QS PI and cost overrun disputes
- Construction expert witness PI
- Quantity surveyors sector page — speak to a broker
- All Apex PI sectors
About Apex Insurance Brokers
Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority, FCA firm reference 724952. Registered in England and Wales, Companies House 07014570. Trading address QCS, 53 Queen Charlotte Street, Bristol BS1 4HQ; registered office c/o Westcan, 5 Anglo Office Park, Bristol BS15 1NT. Email info@apexinsurancebrokers.co.uk, telephone 0117 325 0027. This guide is general information about Professional Indemnity Insurance for UK quantity surveying practices and is not advice tailored to any individual firm's circumstances. Last reviewed: May 2026.
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