INSURANCE GUIDE Architects Professional Indemnity Insurance UK - ARB requirements and what it covers |
TL;DR
- Professional indemnity insurance is mandatory for all registered architects under Standard 8 of the ARB (Architects Registration Board) Code of Conduct.
- Architects PI covers claims from clients for financial loss caused by design errors, specification mistakes, negligent supervision, and other professional failures.
- The RIBA recommends a minimum PI limit based on fee income - typically at least 2.5 times the annual fee income or GBP 250,000, whichever is greater.
- Design and build contractors who take on design responsibility need PI as well as CAR insurance - standard CAR does not cover design errors.
- Annual premiums range from approximately GBP 1,000 for a sole practitioner to GBP 20,000+ for a larger practice with complex project types.
Last reviewed: June 2026
KEY FACTS | |
| Legal basis | ARB Code of Conduct Standard 8 - PI insurance mandatory for all registered architects in practice |
| What it covers | Design errors, specification mistakes, negligent supervision, breach of professional duty, and related civil liability |
| RIBA minimum limit | At least 2.5 times annual fee income or GBP 250,000, whichever is greater - RIBA recommendation |
| Design and build | Contractors undertaking design responsibility need PI in addition to CAR - CAR does not cover design errors |
| Claims-made basis | Policy in force when claim is made responds - retroactive cover maintained through continuous renewal |
| Annual premium range | GBP 1,000 to GBP 5,000 for sole practitioners; GBP 5,000 to GBP 20,000+ for larger practices |
ARB and RIBA PI Requirements
The Architects Registration Board (ARB) is the statutory body that regulates architects in the UK under the Architects Act 1997. All persons using the title "architect" must be registered with the ARB. Standard 8 of the ARB Code of Conduct requires registered architects to have adequate and appropriate insurance cover in place. Practising without PI insurance is a breach of the ARB Code and can result in disciplinary action including removal from the register.
The Royal Institute of British Architects (RIBA) is the professional body for architects. RIBA membership is separate from ARB registration and RIBA publishes its own recommended PI minimum levels. The RIBA standard appointment forms for architects include PI provisions and recommended minimum limits.
KEY FACTS
|
What Architects PI Covers
Architects PI covers the civil liability of the architect arising from the provision of professional architectural services. Key covered scenarios include:
- Design errors: Errors in the architectural design that result in structural problems, cost overruns, or functional failures in the completed building
- Specification mistakes: Incorrect material or product specifications that cause building defects or performance failures
- Negligent supervision: Failure to adequately supervise the construction works causing defects to arise undetected
- Planning advice errors: Incorrect advice on planning requirements resulting in the client proceeding with a development that cannot be approved
- Contract administration errors: Mistakes in administering the building contract causing financial loss to the client
Related Guides |
Disclaimer: This guide is for general information only. Kael Tripton Ltd is not authorised or regulated by the FCA. Always verify details with an FCA-authorised insurer or broker before purchasing. |
Frequently Asked Questions
What is the minimum PI limit for architects?
The RIBA recommends a minimum PI limit of 2.5 times the annual fee income or GBP 250,000, whichever is greater. The ARB Code requires "adequate and appropriate" insurance without specifying a minimum limit numerically. In practice, RIBA client appointment forms specify the minimum limit the architect must maintain. For significant projects, clients may require GBP 1 million to GBP 5 million or more.
Do architects need PI after they retire?
Yes. Run-off PI cover is required after retirement or cessation of practice to cover claims arising from past work. The limitation period for negligence claims is 6 years for simple contracts and 12 years for contracts under deed. Architects should maintain run-off cover for the relevant limitation period after their last project completes. The last insurer before retirement may have specific run-off obligations under the policy terms.
Does CAR insurance cover design errors for design and build architects?
No. Contractors all risk (CAR) insurance covers physical damage to the works under construction. It explicitly excludes design errors. A design and build contractor or architect who takes on design responsibility needs separate professional indemnity insurance for the design element. Both CAR and PI are required for a design and build project.
Does architects PI cover loss of documents?
Most architects PI policies include a loss of documents extension covering the cost of reproducing drawings, specifications, and other documents lost or destroyed, and any associated liability to third parties for the document loss. Given the increasing reliance on digital drawings and BIM models, loss of data and cyber risks are also relevant to architects - check whether the PI policy includes cyber cover or whether a separate cyber policy is needed.
What is a RIBA appointment and how does it relate to PI?
RIBA appointment documents (including the RIBA Standard Professional Services Contract) are standard-form contracts for architectural services. They include provisions requiring architects to maintain PI at minimum specified limits throughout the appointment and for a defined period (typically 6 or 12 years) after practical completion. Using RIBA appointment forms is recommended practice and helps ensure consistent PI terms across the profession.
Sources |
