Architects and surveyors insurance UK — combined and coordinated PI cover

~3 min read

Reviewed by Matthew Bartlett, Director · Last reviewed 2026-07-08

Some UK design and property practices operate with both architects (ARB-registered) and surveyors (RICS-regulated) under one roof. Others operate as separate legal entities that share office space or resources. Either way, the professional indemnity cover needs to address both regulator regimes — ARB Standard 8 and RICS Rule 9 with the RICS PII Requirements — and any specific work-type exposures that either discipline generates. This entry sets out how coordinated architects-and-surveyors PI cover typically works, where the regulator overlaps sit, and typical placement structures.

Two firms or one

The structural choice is the first driver. A single limited company holding both ARB-registered architects and RICS-registered surveyors carries PI at the firm level covering both disciplines — one policy, one renewal, one wording. Two separate limited companies (or LLPs) each hold their own PI cover, with an internal coordination mechanism where the same client engages both entities.

Single-entity is administratively simpler. Two-entity is common where the disciplines have different economic profiles or where each entity has different partnership arrangements.

Combined firm PII wording

A combined ARB/RICS firm's PI policy needs a wording that:

Expressly covers both ARB-registered architects and RICS-registered surveyors as professionals within scope
Meets the RICS PII Requirements (the more prescriptive of the two regulator regimes) — specifically on aggregation, defence costs, extensions for pollution/defamation/loss of documents
Covers work types on both sides — building surveys and dilapidations on the RICS side; contract administration and lead consultant work on the ARB side
Addresses BSA 2022 s.135 residential exposure across both disciplines

Short answer — market ranges

Small combined practice (2–5 professionals), mixed commercial and residential design + surveying, £300k–£1m turnover: £2m–£5m primary. Effectively the higher of the ARB adequacy standard and the RICS band minimum.
Mid-market combined firm (5–15 professionals), £1m–£3m turnover: £5m–£10m primary layer. BSA 2022 residential exposure typically pushes sizing to the upper end.
Larger multi-discipline firm (15+ professionals): £10m–£25m tower typical.

Where the discipline mix pushes sizing up

Two work types generate specific claim exposure at the upper end.

Red Book valuation (RICS side). Valuations delivered for lender clients carry loss claim quanta that can dwarf the fee. See our Red Book PII entry.

Contract administration on high-value schemes (ARB side). The architect acting as contract administrator sits in the line of fire for payment disputes and delay claims. Where the firm handles CA on £10m+ schemes, sizing should reflect the specific exposure.

Two-entity coordination

Where the practice operates as two separate legal entities, coordination matters. On a single client engagement where both entities contribute — the surveying firm produces the building survey; the architectural firm produces the design and CA — a claim can involve both. The two policies should be placed to coordinate, with clean allocation of liability at the wording level.

BSA 2022 across both disciplines

Both architects and surveyors sit within DPA section 1 scope for residential dwelling work. BSA 2022 s.135's 30-year retrospective / 15-year prospective limitation extension applies to both. Combined firms with residential exposure carry the combined risk on both sides.

Worked example

Illustrative only. A five-professional combined ARB/RICS practice: three architects, two building surveyors, £1.4m turnover. Mixed commercial fit-out (£3-8m construction values) and residential design + surveying (some above 18m). Combined PI policy at £5m primary + £5m top-up for a £10m tower, wording meeting RICS PII Requirements as the more prescriptive base, express coverage for both ARB-registered and RICS-registered activities, contract admin endorsement, BSA 2022 residential endorsement. Fifteen-year run-off costed given the residential exposure across both disciplines.

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