Construction professional indemnity

Category: Professional indemnity insurance · Reviewed by the Apex broking team · Last reviewed 2026-08-22 · ~5 min read

Who needs it and why

Anyone who exercises professional skill on a construction project can be sued for the consequences of getting it wrong, and construction is unusual in how long that exposure persists and how many parties can bring the claim. Consultants — architects, structural and building services engineers, quantity surveyors, building surveyors, principal designers, project managers — carry the exposure directly. So does a contractor that takes on design responsibility under a design-and-build arrangement, and so does a specialist subcontractor that designs the element it installs.

The trigger is professional obligation rather than job title. A contractor that would ordinarily have no professional indemnity exposure acquires one the moment a contract makes it responsible for design, for selecting a specification, or for a performance outcome rather than for building to someone else’s drawings.

Why the wording matters more here than elsewhere

Construction PI differs from ordinary professional indemnity in a handful of respects that decide claims.

Standard of care. A professional appointment usually imports a duty of reasonable skill and care. A contract that instead promises fitness for purpose, or a specific performance outcome, is imposing a stricter obligation that most professional indemnity wordings do not cover. Signing up to fitness for purpose is the single most common way a construction professional creates an uninsured liability.

Collateral warranties and third-party rights. Consultants and design subcontractors are routinely asked to give collateral warranties to funders, purchasers and tenants, or to grant third-party rights. Each one widens the class of people who can sue on the same work. Wordings and endorsements need to be checked against what the warranties actually promise, particularly on assignment, net contribution and duration.

Net contribution. A net contribution clause limits a consultant’s liability to its fair share where several parties contributed to a loss, rather than leaving it exposed to the whole loss with a right of contribution against the others. Whether one is present is a material commercial point in any appointment.

Long-tail exposure. Construction claims surface many years after practical completion. That makes the retroactive date and continuity of cover critical, and makes run-off cover essential when a practice closes, is sold or ceases to trade.

Aggregation, exclusions and the current market

Construction PI wordings frequently carry aggregate rather than each-and-every limits, and the way related claims aggregate has a large effect on what is actually available when several units, plots or elements are affected by the same design defect. That is a wording question to settle at placement, not at claim.

Exclusions matter disproportionately in this class. Cladding and fire safety exclusions, and restrictions relating to particular materials or building types, have been a persistent feature of the market since the Grenfell Tower fire and the subsequent building safety reforms. Where an exclusion applies, the practical consequence is not only an uninsured claim but an inability to satisfy the insurance obligations in appointments and warranties, which can stop a firm winning work at all.

Buyers should expect underwriters to ask detailed questions about the sectors and building types worked on, the standard of care accepted in appointments, the volume and terms of collateral warranties, and design subcontracting arrangements.

Where to read further

This entry is deliberately a signpost. The detailed treatments live in three guides.

The Building Safety Act and professional indemnity guide covers the statutory changes to liability periods and duty-holder roles and their effect on PI placements.

The consulting engineers PI insurance guide covers the engineering-specific issues — appointment terms, subconsultants, temporary works and site presence.

The design liability and fit-out insurance guide covers contractors and specialists who acquire design responsibility through the contract rather than through a professional appointment.

For the underlying class, see professional indemnity insurance, and for the wider commercial programme in which construction PI usually sits, see our professional indemnity page.

How it fits alongside the rest of a construction programme

Construction PI covers the consequences of professional error. It does not cover physical damage to the works, which belongs to contractors all risks or construction all risks, and it does not cover injury or third-party property damage, which belongs to public liability and employers liability.

The interfaces between these covers are where claims fall between policies: defective design causing damage to the works themselves; damage caused by defective workmanship as opposed to defective design; and rectification costs versus consequential losses. Aligning the wordings across the programme is a job worth doing once, properly, at placement.

Why it matters

Construction is a sector where the insurance obligations are written into the contracts, the liabilities last for years, and the market’s appetite has narrowed. That combination means the wording decides both whether you can take the job and whether you survive the claim. Reading the appointment and the policy against each other, before signing either, is the whole discipline.

Frequently asked questions

Who needs construction professional indemnity insurance?

Anyone exercising professional skill on a project: architects, structural and building services engineers, surveyors, principal designers and project managers, plus design-and-build contractors and specialist subcontractors that design what they install. The trigger is professional or design responsibility under the contract, not the job title.

Why is fitness for purpose a problem for construction PI?

Professional indemnity wordings are built around a duty of reasonable skill and care. A contract promising fitness for purpose or a specific performance outcome imposes a stricter obligation that most wordings do not cover, so accepting it creates a liability the policy will not meet. It is the most common uninsured exposure in the class.

How long does construction PI exposure last?

Far longer than the project. Construction claims routinely surface many years after practical completion, which is why the retroactive date, unbroken continuity of cover and run-off cover on closure or sale of a practice matter as much as the current year's limit.

Does construction PI cover damage to the works?

No. Physical damage to the works belongs to contractors all risks or construction all risks cover, and injury or third-party property damage belongs to public and employers liability. Professional indemnity responds to the financial consequences of professional error, which is why the interfaces between the policies need aligning at placement.

Related entries

• Building Safety Act and professional indemnity
• Consulting engineers PI insurance guide
• Design liability and fit-out insurance
• Professional indemnity insurance
• Net contribution clause
• Run-off cover

This entry is part of the Apex Insurance Wiki. This entry is insurance information, not legal advice. It describes UK insurance law and market practice as at August 2026 and does not address the terms of any particular policy. Take advice on your own wording and your own facts before acting. Last reviewed 2026-08-22. Next review: 2027-02-22.

Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority (FRN 724952). This page is general information, not advice on a specific policy.