Quantity surveyors carry contractual responsibilities that few other professionals share. A cost plan signed off at RIBA Stage 2 becomes the basis for borrowing decisions and shareholder commitments. An interim certificate signed by a professional quantity surveyor (PQS) releases money to a contractor whose solvency cannot always be assumed. A final account, once agreed, is rarely re-opened. Where a QS is appointed as contract administrator under a JCT (Joint Contracts Tribunal) suite, or as project manager under NEC4 (New Engineering Contract), the firm holds the pen on extensions of time, loss-and-expense assessments and compensation events worth many times the firm's fee.
Professional indemnity insurance (PI) is the policy that responds when a client alleges negligent advice, error or omission in those services. For practices regulated by the Royal Institution of Chartered Surveyors (RICS), and for chartered surveyors who have completed the Assessment of Professional Competence (APC) on the Quantity Surveying and Construction pathway, PI is a regulatory requirement and a precondition for tendering on most public-sector frameworks.
Whether you are a sole-practitioner cost consultant working with SME developers, a mid-sized PQS practice on Crown Commercial Service or Procure 22 / Procure 23 frameworks, or a contractor's commercial team carrying out internal valuation and final-account work, the PI policy you arrange should reflect the contracts you administer, the sectors you serve and the long tail of liability that construction work creates.
What does PI insurance cover for quantity surveyors?
A quantity surveyor's PI policy is designed to respond to civil liability arising from the professional services the firm provides. In practical terms, that means defence costs and damages awarded against the practice where a client alleges:
- Negligent cost planning, cost advice or feasibility estimating
- Errors or omissions in a Bill of Quantities (BoQ), pricing document or schedule of works
- Negligent administration of construction contracts (JCT, NEC4, FIDIC, bespoke PFI/PPP) including incorrect interim certificates, mishandled compensation events or missed contractual notices
- Negligent assessment of extensions of time (EOT) or loss-and-expense claims
- Errors in final-account agreement leading to overpayment of contractor
- Defective expert witness reports, adjudicator decisions or dispute services advice
- Breach of professional duty of care, including misstatement or misrepresentation in cost reports
- Breach of confidentiality or the unintended release of client information
- Loss of, or damage to, client documents and data in the surveyor's custody
Most modern wordings are arranged on a "civil liability" rather than a narrower "negligence" basis, which broadens the response to include innocent misrepresentation and certain contractual liabilities. Cover is almost always written on a claims-made basis: the policy in force when a claim is first notified is the policy that responds, not the policy in force when the work was done. Run-off cover, which extends notification rights after the firm ceases trading, is therefore central for retiring principals, mergers and practice sales.
RICS rules require regulated firms to maintain PI at minimum levels, on RICS-approved wordings, with an aggregated approach to the limit and specified excess caps relative to fee income. We can review your firm's RICS minimum requirements against the policy your insurer is offering and identify any gaps before renewal.
Common quantity surveyor PI claim scenarios
Real claims rarely follow the textbook examples. They tend to arise where commercial pressure, contractual complexity and end-user expectations collide. The following anonymised scenarios are typical of allegations a UK QS firm may face.
- Cost plan understated by a material margin. A PQS issues a Stage 3 cost plan that becomes the funding basis for a residential scheme. Tender returns come in materially above plan and the developer alleges the cost advice was negligently low, forcing value engineering and a delayed start. Defence and settlement costs reach a six-figure sum.
- Interim certificate overvaluation. A surveyor administering a JCT contract certifies works that, on later review, were not in fact complete to the value certified. The contractor enters administration. The employer alleges the over-certification exposed it to loss and pursues the QS for the shortfall.
- Missed NEC4 compensation event notice. A project manager misses the clause 61.3 notification deadline on a compensation event. The contractor argues the event should have been assessed and seeks recovery of the additional cost; the client argues that, but for the missed deadline, the additional cost would not have been payable. Both sides look to the QS firm.
- Final account overpayment. A final-account agreement is later challenged on the basis that the QS double-counted certain provisional sums. The employer recovers the overpayment from the QS practice via a PI claim, typically in the region of £100,000 to £250,000.
- Defective expert witness report. A QS engaged as an expert witness produces a report that is later excluded by the tribunal because of methodological error. The instructing client argues the case was lost as a result and seeks recovery of legal costs.
- Building Safety Act cost certification. A QS certifies costs on a higher-risk building project under the Building Safety Act. A later regulator review challenges the certification basis. The firm faces both a civil claim and the cost of supporting a regulatory investigation.
Choosing the right cover for your quantity surveying firm
The right PI limit reflects the contracts you sign, the largest realistic exposure on a single project, and the requirements of RICS and the frameworks you work on. As a general guide for UK QS practices:
- £2m–£5m is common for smaller and mid-sized PQS practices and contractor's QS teams working on standard commercial and residential projects
- £5m–£10m is frequently specified by larger developers, public-sector clients and Crown Commercial Service or NHS Procure 22/23 frameworks
- £10m–£25m is typical for major infrastructure, large mixed-use schemes and PFI/PPP work, often arranged through project-specific PI
A particular consideration for QS firms is the choice between aggregate and each-and-every-claim wordings. Many QS practices deal with a high number of relatively low-value matters across multiple live projects. An aggregate limit can be exhausted by an unusually busy claims year, leaving no cover for later notifications. Each-and-every-claim wordings provide a separate limit per claim, subject to insurer appetite and pricing. We can discuss which structure best suits your work mix.
Other points to test include the breadth of the "professional services" definition (does it capture contract administration, project management, employer's agent, dispute services, expert witness and BIM coordination if you offer those?), the position on net-contribution clauses in appointments, treatment of sub-consultants, and the availability of run-off cover for an extended period given the long limitation periods that now apply to construction claims.
Why work with Apex as your quantity surveyor PI broker
Apex Insurance Brokers Limited is an independent broker based in Bristol, specialising in professional indemnity for UK professional services firms. We are authorised and regulated by the Financial Conduct Authority (FCA firm reference 724952) and have access to a panel of insurers active in the construction professional indemnity market, including specialist Lloyd's syndicates and RICS-approved policy providers.
Working with an independent specialist means your renewal is not tied to a single insurer's appetite. We can present your firm to the markets most likely to engage with your service mix, your turnover profile and the contracts you administer — whether that is small commercial fit-out, major residential development, healthcare, education, infrastructure or higher-risk buildings under the Building Safety Act. We take time to understand the appointment documents and net-contribution wording that drive your insurance requirement, and we provide claims advocacy — supporting you through the notification, defence and resolution of any claim or circumstance.
We do not pay or receive inducements, and we are transparent about how we are remunerated. Our aim is to arrange cover that is appropriate for your firm and well-matched to the work you actually do.
Frequently asked questions
Does RICS require quantity surveyors to carry PI insurance? Yes. RICS-regulated firms must maintain PI at the minimum limits set out in the RICS regulations, on RICS-approved wordings, with specified excess caps relative to fee income. We can review your firm against current RICS minimum requirements as part of any quotation exercise.
What is the difference between aggregate and each-and-every-claim limits? An aggregate limit is the total amount the insurer will pay across all claims in a policy year. An each-and-every-claim limit applies separately to each claim. For QS firms with frequent low-value matters, each-and-every-claim can offer stronger protection but is not always available; aggregate wordings with reinstatement provisions are a common alternative.
Will my policy cover dispute services and expert witness work? Most policies cover RICS-accredited dispute services (adjudication, expert witness, mediation) as part of professional services, but it is worth confirming explicitly, especially where the firm acts as a third-party adjudicator rather than as adviser to a party.
What about NEC4 project manager and JCT contract administrator roles? These contract-holder roles carry higher exposure than pure cost consultancy, particularly around timely notices and certification. They are usually covered as professional services, but insurers will want to understand the proportion of fee income from these activities.
How does the Building Safety Act 2022 affect my PI cover? The Building Safety Act has extended limitation periods for claims relating to dwellings and introduced cost-certification expectations for higher-risk buildings. Insurers consider these factors when underwriting, and some impose conditions on HRB work. We can review your activity and confirm where your existing policy responds.
What is run-off cover and how long should I buy it? Run-off cover extends the right to notify claims after a firm ceases trading or sells. Six years is a common minimum, but RICS guidance and the extended construction limitation periods mean that longer run-off (often 6 to 12 years) is increasingly considered, particularly for principals retiring from PQS practice.
Do I need separate cyber insurance as well? Most PI policies include limited data and confidentiality wordings but are not a substitute for a standalone cyber policy. Firms running cloud-hosted cost-planning tools, shared BIM environments and client portals should consider cyber cover alongside PI.
Get a quote
If you would like to discuss your PI arrangements, request a review of your current wording, or obtain terms for a new policy, please get in touch. Call 0117 325 0027, email info@apexinsurancebrokers.co.uk, or request a quote online. Full contact details are available on our contact page.
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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. Last reviewed: May 2026.