Public liability insurance construction questions in the UK mostly come down to contracts, not statutes. This guide shows which rules are legal, which are set by clients and councils, how the standard building contract forms treat insurance, and what HSE data says about the risk. We checked the pages on 3 November 2026. We explain and do not recommend any policy.
Quick answer
We found no UK rule that makes public liability insurance compulsory for construction firms, but employers' liability is required once you employ staff. Contract documents and licences set limits, often £5 million or £10 million in the examples we read.
Public Liability Insurance Construction at a Glance
| Question | Short answer |
|---|---|
| Is public liability compulsory for builders? | We found no gov.uk page saying so, and HSE Northern Ireland calls it voluntary |
| What is compulsory? | Employers' liability, once you employ anyone |
| Does CDM 2015 mention insurance? | The HSE summary says nothing about it |
| What do councils ask contractors for? | £5 million public liability on school sites, in the example we read |
| Who sets the figure? | The client, the contract or the licence |
| What do HSE figures show? | 25 worker deaths in construction in 2025/26, provisional |
| Which cover protects workers? | Employers' liability, not public liability |
Where the Legal Line Sits for Public Liability Insurance in Construction
Two layers of rules apply to a construction business, and neither makes public liability insurance compulsory. The first is employers' liability. Gov.uk says you need it as soon as you become an employer, with at least £5 million of cover from an authorised insurer, and that a fine of £2,500 applies for every day you are not properly insured. Close family members and people based outside England, Scotland and Wales are exempt.
The second layer is health and safety law, which governs how work is done and not how it is insured. The Construction (Design and Management) Regulations 2015, known as CDM 2015, are summarised on an HSE page last updated on 7 November 2024. That page lists duties for clients, designers, principal designers, principal contractors, contractors and workers, and it says nothing about insurance. The so what: a CDM duty is something you do, and an insurance policy is something you hold. One does not replace the other. Our hub guide shows how the three main covers fit together.
Who Holds a Duty on a Project
The HSE page names the roles that appear in contract documents, so knowing them helps you read a requirement. The table summarises what the page says each role does.
| Role | What the HSE page says |
|---|---|
| Commercial client | Makes suitable arrangements for managing a project and appoints the other duty holders |
| Principal designer | Plans, manages and coordinates health and safety before construction, where there is more than one contractor |
| Principal contractor | Coordinates the construction phase and prepares the construction phase plan, where there is more than one contractor |
| Contractor | Plans, manages and monitors its own work so it is done without risk to health and safety |
| Worker | Looks after their own and others' safety, reports dangers and cooperates |
Domestic clients are in scope, but the page says their client duties normally pass to the contractor on a single-contractor project, or to the principal contractor on a multi-contractor one. If the householder does the work themselves, CDM 2015 does not apply. We did not find a source saying how a policy treats a domestic client, so ask the seller if your work is mostly for householders.
Reading the Risk: What HSE Data Does and Does Not Show
HSE's provisional figures say 25 workers were killed in construction in 2025/26, the largest count of any main industry. The page was updated on 30 June 2026, and the figures will be finalised in July 2027. HSE's earlier construction summary, published on 20 November 2025, gave 35 provisional deaths for 2024/25, an average of 40 across 2020/21 to 2024/25, and about 50,000 workers with non-fatal injuries a year, based on the Labour Force Survey. It also gave around 2.2 million working days lost each year.
We do not compare 35 with 25. One is a provisional figure from an older release and the other is a provisional figure from a newer page, and we have not seen the final numbers for either. The so what is more useful: these are statistics about workers, so they relate mainly to employers' liability. Public liability responds to injury or damage affecting people you do not employ, such as a passer-by, a visitor or a neighbour. We did not find an HSE table of third-party injuries from construction work, so we make no claim about their size.
Where Public Liability Insurance Construction Limits Come From
Limits on construction work come from the body that controls the job. The table lists the examples we found. Our requirements guide owns the full comparison, including the age of each page.
| Source | What it asks | Page status |
|---|---|---|
| Staffordshire County Council, school-site contractors | At least £5 million public liability and at least £10 million employers' liability, kept in force continuously | Undated |
| Medway Council, scaffolding and hoarding licences | Public liability, not employers' liability, of at least £5 million | Dated 10 December 2019, about 7 years old by our arithmetic |
| East Sussex County Council, tenders | £10 million for each claim as standard, reduced for lower-risk activities | Undated |
Look at the Staffordshire row. The council asks for more employers' liability than the legal minimum, which shows that a client can set a bar above the law. Look at the Medway row too. The licence asks for a particular policy, public liability, and says employers' liability does not satisfy it. The so what: when you send proof of cover, check that you are sending the policy the clause names. Say a scaffolder applies for a highway licence and attaches the wrong certificate. The application then fails on a paperwork point, not a safety one.
How Building Contracts Treat Insurance
Standard building contracts add a third source of requirements. We read two secondary pages about the JCT forms, so treat this section as a pointer and read the contract itself.
A Fenwick Elliott article published on 8 June 2021, and shown as modified on 1 August 2025, says the contractor's public liability insurance is required under clause 6.4 of the JCT Design and Build form. The firm says it often covers existing structures up to an agreed level, with the landlord's insurance responding above that level. It also advises contractors to check for "care, custody or control" exclusions that could remove cover for the property where the work takes place.
A 2019 article on the JCT site, credited to an insurance broker's staff member, lists three insurance options. In Option A the contractor insures the works. In Option B the employer does. In Option C the employer arranges cover for the contractor, including the existing structure against specified perils. The article gives £10 million as an example limit for contractor third party liability. It is old and commercial, so we use it only to show the structure.
| Option | Who insures the works | Is that public liability? |
|---|---|---|
| A | Contractor | No, it is insurance of the works |
| B | Employer | No |
| C | Employer arranges it for the contractor | No, with existing structures covered for specified perils |
The table's last column is our reading. Works insurance and public liability answer different questions, so a contract can require both. The so what: when a contract says "insurance", ask whether it means insurance of the works, third party liability, or both.
Subcontractors and the Chain
A main contractor may ask each subcontractor for proof of cover, and the figure may differ from the one in the main contract. We found no source that sets the rule for the whole chain, so the answer lies in the subcontract.
Picture a small groundworks firm engaged by a contractor who works for a council. The council's page asks the contractor for one figure. The subcontract may ask the groundworks firm for the same figure, a lower one or a higher one. The firm reads the subcontract clause, checks its schedule for the limit and basis, and asks its seller for a letter or certificate that matches the dates of the work. The firm needs no special knowledge for this. It needs two documents laid side by side. Our sole trader guide covers the same checks for a one person firm.
A Public Liability Insurance Construction Contract Check Before You Sign
Use the grid below to test public liability insurance construction wording on any contract or tender. It is our worksheet, not an insurer's form.
| Question | Where to look | Your answer |
|---|---|---|
| Which policies does the contract name? | The insurance clause | |
| What figure, and is it for each claim or for the year? | The clause or schedule | |
| Does the wording exclude care, custody or control of the property I work on? | The policy wording | |
| Are existing structures covered, and by whom? | The contract and the owner's policy | |
| For what dates must cover be in force? | The contract programme and the certificate | |
| Is a higher figure needed for part of the work? | Tender documents |
An empty cell is a question for the client or the seller. The fourth row ties to the Fenwick Elliott point about existing structures, and the third to the exclusion it flags. The so what: a limit on a certificate means little until the wording behind it covers the kind of work you actually do.
Buying, Checking and Complaining
When you buy, the Insurance Act 2015 duty of fair presentation applies to business contracts. Part 2 of the Act, as enacted, requires you to disclose what you know or ought to know, or give enough information to prompt further questions. Describe the work accurately, including work at height or on occupied premises, because public liability insurance construction quotes are only as good as the description behind them.
Search the exact firm name on the FCA Financial Services Register, last updated on 13 February 2026. If you need to complain, contact the firm first, then go to the Financial Ombudsman Service within 6 months of the final response. The Ombudsman applies size tests, set out on its eligibility page, so a growing contractor should check its numbers.
What Is Moving Into 2027
| Item | What we found | Why it matters |
|---|---|---|
| HSE figures | The 2025/26 deaths figures are provisional and will be finalised in July 2027 | Re-check before quoting any number |
| Product liability law | A Law Commission consultation closes on 14 January 2027 | Contractors who supply materials or products should watch the outcome |
| Council pages | Several figures sit on undated or old pages | Re-check each requirement at the next tender |
Where to Go Next on Cairn Cover
The one thing to remember about public liability insurance construction work: the law fixes employers' liability, and the contract, council or licence fixes the rest. Cairn Cover is a free guide and does not sell insurance or quote prices. Read the 10 million guide if a tender names a high limit, and the public and product liability guide if you supply goods.
Frequently Asked Questions
Is public liability insurance compulsory for builders in the UK? We found no gov.uk page that makes it compulsory, and HSE Northern Ireland calls it voluntary. Clients, councils and contracts often require it, so check the document that asks for your work.
What is compulsory for a construction business? Employers' liability is, once you employ anyone, with at least £5 million of cover. Fines run to £2,500 for every day you are not properly insured.
How much public liability do contractors need? It depends on the client. One council page asks for at least £5 million on school sites, and another sets £10 million for each claim as a standard. Your contract sets the figure that counts.
Does CDM 2015 require insurance? The HSE summary says nothing about insurance. CDM 2015 sets duties for how projects are managed and carried out.
Does public liability cover my workers? No. Public liability responds to injury or damage affecting people you do not employ. Injury to your own staff is an employers' liability matter.
What is the difference between works insurance and public liability? Works insurance protects the project itself, and public liability responds to third party claims. A JCT contract can require both, so read which one a clause names.
Do I need a higher limit for a council tender? Possibly. East Sussex sets £10 million for each claim as standard, reduced for lower-risk work. Check the tender document.
How does Cairn Cover help? We read government, regulator and council pages, date them, and link them on the words they support. We do not sell insurance, quote prices or recommend a limit.