Professional indemnity insurance and why it matters to you
Professional indemnity insurance responds to the policy in force when a claim is made, not when the work was done. That single feature decides whether you have a remedy.
Consultant professional indemnity planning cover is the insurance that pays when a consultant's advice turns out to be wrong and you lose money as a result. For a self-builder it matters in one specific way: if the ecologist, the drainage engineer or the planning consultant makes a mistake that costs you a season or a redesign, the insurance is what stands between you and a claim against a practice with no assets.
It is worth ten minutes of asking before you appoint anybody. Most people never ask, and then discover the position only when something has gone wrong.
What the insurance covers and what it does not
Professional indemnity insurance covers claims arising from negligent acts, errors or omissions in professional services. A survey that missed a protected species. A drainage design based on the wrong invert level. A planning statement that misread the adopted policy and led to a refusal.
It does not cover everything. It is not a guarantee of outcome, so a refused application is not itself a claim; you would have to show the consultant fell below the standard of a reasonably competent practitioner in that field and that the failure caused you loss. It does not cover the consultant's fee if you are simply unhappy. And policies carry exclusions, some of which have widened in recent years, with fire safety and cladding work being the obvious example.
The distinction that catches people out is between an error and an unwelcome result. Planning is a judgement system. A consultant who advises that a scheme has a reasonable prospect, states the risks and is proved wrong has not necessarily been negligent.
Levels of cover and how to ask about them
Ask two questions. What is the limit of indemnity, and is it each and every claim or in the aggregate.
A £1,000,000 limit on an each and every claim basis means that sum is available for each separate claim in the policy year. The same limit in the aggregate means £1,000,000 total for the year, shared across every claim made against that practice. On a busy consultancy, aggregate cover can be exhausted by other people's problems before you ever make a claim.
Then ask about the excess, because a small practice with a high excess may not be in a practical position to settle a modest claim.
Chartered bodies set some of the floor here. Firms regulated by the Royal Institution of Chartered Surveyors must hold professional indemnity insurance to minimum levels set on a sliding scale by turnover, and chartered architecture practices are required to hold cover as a condition of chartered practice status. Not every discipline is subject to an equivalent mandatory requirement, so for a smaller specialist consultancy the honest answer is that you have to ask and see the certificate.
Claims made policies and run off cover
This is the technical point that matters most and is understood least.
Professional indemnity is written on a claims made basis. Cover responds according to the policy in force when the claim is made, not the policy in force when the work was done. So a report written in 2024 by a practice that stopped paying premiums in 2026 is uninsured when the problem emerges in 2027, even though the practice was fully insured on the day it did the work.
Run off cover is the answer. When a practice closes or a sole trader retires, run off insurance keeps the claims made cover alive for a period afterwards. Six years is a common target because of the ordinary contractual limitation period, and longer where the appointment was executed as a deed.
Ask a sole practitioner what their run off arrangements are. It is not an impertinent question. It is the difference between having a remedy and having a grievance.
Liability caps in appointment terms
Most consultant appointments now cap liability, and the cap can be very much lower than the insurance limit. A cap set at the level of the fee is common for small commissions and means a £1,200 ecology report carries £1,200 of liability, whatever the consequences of getting it wrong.
Read for four things:
- The monetary cap, and whether it is expressed as a fee multiple or a fixed sum
- A net contribution clause, which limits the consultant's share where more than one party contributed to the loss
- The limitation period, and whether the appointment is a simple contract or executed as a deed
- Any exclusion of liability for indirect or consequential loss, which is where delay costs usually sit
Caps are negotiable on larger commissions and rarely on small ones. The realistic response for a self-builder is not to fight the cap but to know it exists, and to weight the appointment towards a practice whose work you can check.
Our guide to writing a brief for a specialist planning report covers how to set the scope so that the deliverable is defined tightly enough for a failure to be identifiable in the first place.
Where a warranty is needed for a funder
If you are borrowing against the project, the lender may want a collateral warranty from each consultant: a direct contractual link between the consultant and the lender, so the lender can sue in its own right if it takes possession.
Warranties often carry step-in rights, letting the funder take over the appointment. They also usually require the consultant to maintain professional indemnity insurance for a stated period at a stated level, which is one of the few mechanisms that actually forces run off cover to be bought.
Consultants price warranties. Ask at fee proposal stage whether one is included and what it would cost, because asking after appointment invites a variation.
Questions to ask before signing
- What is your limit of indemnity, and is it each and every claim or in the aggregate?
- Can I see a copy of the current certificate, with the renewal date?
- What exclusions apply to work of this type?
- If you cease practising, what run off cover will be in place and for how long?
- Does your appointment cap liability, and at what level?
- Will you provide a collateral warranty if my lender requires one, and at what cost?
Question two is the one that tells you the most. A practice that produces the certificate without hesitation is a practice that has thought about this. Hesitation is information.
The same questions apply whoever you are instructing, and they sit alongside the competence checks. For reports where a licensed or competent professional is legally required, such as a protected species survey or a biodiversity gain assessment, insurance does not substitute for the licence or the competence. You need both.
What to keep on file
Keep the fee proposal, the signed appointment, the insurance certificate current at the date of the appointment, the scope and exclusions, and every instruction that changed the scope afterwards. Keep them for at least as long as the limitation period running from completion.
Also keep the issued reports with their version numbers and dates. A claim that a report was wrong needs the report as issued, and reconstructing which draft the council actually received is difficult two years later.
Independence matters as much as insurance where the evidence is contested, and our note on independence and conflicts of interest in planning evidence covers that side of the appointment. A Structural Survey is a good example of a report where both the competence and the insurance position are worth checking before instruction.
Where PlanScope produces an AI-assisted draft, the professional who reviews and signs it off is the one carrying the responsibility for the content, which is exactly why the professional directory exists as a route to sign-off. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. For specialist technical reports, qualified professional input may be required.
This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.
Frequently asked questions
What does claims made mean?
Cover responds under the policy in force at the time the claim is made, not the policy in force when the work was carried out. A practice that was insured when it wrote your report but has since stopped paying premiums is uninsured when the problem emerges later, unless run off cover was bought to bridge the gap.
Is a refused application a claim against the consultant?
Not by itself. Planning is a judgement system and a consultant who advised that a scheme had a reasonable prospect, set out the risks and was proved wrong has not necessarily been negligent. A claim needs a failure to meet the standard of a reasonably competent practitioner, and a resulting financial loss.
What is the difference between each and every claim and aggregate cover?
An each and every claim limit makes the stated sum available separately for each claim in the policy year. An aggregate limit is the total available across all claims that year, shared between every client. Aggregate cover on a busy practice can be exhausted by other clients before you ever make a claim.
How long should run off cover last?
Six years is a common target because of the ordinary contractual limitation period, and longer where the appointment was executed as a deed. Ask a sole practitioner directly what arrangements are in place, because run off is a cost they carry after the income has stopped and it is sometimes not bought at all.
Does a liability cap make the insurance pointless?
No, but it changes what the insurance is worth to you. Caps set at the level of the fee are common on small commissions, so a modest report may carry only modest liability regardless of the practice's policy limit. Read the appointment for the cap, any net contribution clause and exclusions for consequential loss.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.