How much PI insurance cover do I need as a consulting engineer in the UK?

~2 min read

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

Consulting engineers in the UK face a PI sizing question shaped less by regulator prescription and more by contractual requirement and specific work exposure. Unlike architects or surveyors, the engineering profession has no single statutory regulator prescribing PII limits. Instead, the client contract matrix — JCT, NEC, framework agreements, PFI, direct commercial appointments — typically specifies the minimum PII cover. This entry sets out how consulting engineers should size cover, the discipline variations, and where BSA 2022 changes the calculation.

Short answer — market ranges

Sole practitioner or micro-firm, low-value residential work: £250k–£500k primary. Public sector work not accessible at this level.
Small consultancy (2–5 engineers), mixed civil/structural, £2m–£10m construction values: £1m–£5m primary.
Mid-market consultancy (5–20 engineers), civil/structural/M&E: £5m–£10m primary plus £5m–£15m top-up common.
Larger consultancy (20+ engineers): £15m–£25m tower typical for civil-heavy books; £25m+ for structural specialists with high-rise residential.
High-rise residential structural specialists: £25m–£50m towers common post-BSA 2022.

Discipline variations

Structural engineering carries the highest severity exposure of the mainstream engineering disciplines. A single miscalculated foundation load, cladding attachment error, or temporary works failure can generate claim quanta running into eight figures.

Civil engineering carries mid-range severity with broader distribution.

M&E engineering carries lower average severity but safety-related electrical failures can be significant.

Environmental and geotechnical generate substantial remediation-cost claims on contaminated land or ground condition assessments.

The BSA 2022 overlay

Section 135 extended the DPA 1972 limitation window to 30 years retrospectively and 15 years prospectively for defective residential dwellings. Any consulting engineer whose work fell within DPA section 1 faces claim tails materially longer than the pre-BSA six-year limitation.

Contractual PII requirements

JCT construction contract on commercial project: £2m–£5m depending on project value
NEC contract, public-sector infrastructure: £5m–£10m typical
Framework agreement, larger public sector: £10m+ on CCS frameworks
PFI/PPP arrangements: £10m–£25m contractual specification common

Worked example

Illustrative only. A six-engineer structural consultancy, £1.9m fee income, mixed portfolio. Contractual matrix requires £10m on the largest current appointments. Broker recommendation: £10m primary layer with high-rise residential endorsement, £10m top-up for a £20m tower. Fifteen-year run-off costed given residential BSA exposure.

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