What insurance does a builder legally need in the UK?

Only two covers are required by law. If you employ anyone (including labour-only subcontractors, apprentices and most casual labour) the Employers' Liability (Compulsory Insurance) Act 1969 requires employers' liability insurance with at least £5 million of cover from an authorised insurer, and HSE can fine you up to £2,500 for every day you trade without it. If you drive a van or any vehicle, the Road Traffic Act 1988 requires motor insurance, and it must cover business use, not just commuting. Everything else (public liability, contract works, tools) is optional in law but demanded by clients, councils and main contractors in practice.

Is public liability insurance a legal requirement for builders?

No. There is no statute requiring a builder to carry public liability insurance. HSE's own guidance describes it as generally voluntary, in contrast to compulsory employers' liability. It is commercially unavoidable rather than legally required: most commercial clients, local authorities and principal contractors will not let you on site without proof of cover, and domestic customers increasingly ask for it. Typical cover levels are £1 million, £2 million or £5 million; £5 million is the level most commonly demanded for council and commercial work.

Do I need employers' liability insurance for subcontractors?

Usually yes for labour-only subcontractors, no for genuinely independent bona fide subcontractors. HSE's guidance says the test is the real working relationship, not the label or tax status: if you supply the materials and tools, direct how and when the work is done, and pay them for their labour, they generally count as employees for the purposes of the 1969 Act even if they are self-employed for tax under CIS. A bona fide subcontractor who prices the job, works under their own direction and carries their own insurance is generally not your employee, but your public liability insurer will expect them to hold their own cover and will ask you to check certificates.

What does contract works insurance cover?

Contract works (sometimes called contractors' all risks) covers the work itself while it is unfinished (the half-built extension, materials on site, and materials in transit) against fire, flood, storm, theft and vandalism. Without it, a fire the night before handover leaves you rebuilding at your own cost, because public liability only covers damage to other people's property, not the works you are being paid to construct. JCT and most standard building contracts state which party must insure the works, so check the contract before assuming the client's policy covers you.

How much does builders' insurance cost?

It depends on trade, turnover, employee count, cover levels and claims history, which is why quoted 'average premiums' are rarely meaningful. A sole-trader general builder buying £1-2 million public liability typically pays a low three-figure annual premium; adding employers' liability, higher indemnity limits, contract works, plant and tools cover each raises it. Height and depth limits matter too, because insurers price roofing, scaffolding, underpinning and basement work much higher than general building. Get like-for-like quotes from at least three providers or use an FCA-authorised broker, and check every quote against the same cover levels and excesses.

What happens if I have no employers' liability insurance?

You can be fined up to £2,500 for any day on which you employ someone without the required insurance, and up to £1,000 for failing to display the certificate or refusing to show it to an HSE inspector. The exposure is bigger than the fine: an employee injured on site can sue you personally, and without insurance the damages, care costs and legal fees come out of the business, routinely six or seven figures for serious injury. Certificates should be kept even after they expire, because industrial-disease claims can arrive decades later.

Builders' insurance UK: what you legally need, what clients demand, and what you can skip

Sol WrightCo-founder, Tradehand

Published 14 August 2026Updated 19 August 2026

Only two insurances are required by law for a UK builder: employers' liability, at least £5 million the moment you employ anyone, and motor insurance for your van. Everything else (public liability, contract works, tools, plant, personal accident) is optional in law and near-mandatory in practice, because councils, commercial clients and principal contractors ask for certificates before you get near the site. This guide covers what each cover actually does, who genuinely needs it, and where builders overpay.

Builders' insurance UK: what you legally need, what clients demand, and what you can skip

The two covers the law requires

Employers' liability. The Employers' Liability (Compulsory Insurance) Act 1969 requires any employer to insure against liability for injury or disease sustained by employees, with a minimum of £5 million of cover, through an authorised insurer. The trap for builders is who counts as an employee: HSE's guidance looks at the real working relationship, so labour-only subcontractors (people you direct, supply materials to and pay for their time) generally count, even when they are self-employed for tax under CIS. Trading without the cover risks a fine of up to £2,500 per day.

Motor insurance. Section 143 of the Road Traffic Act 1988 makes it an offence to use a vehicle without third-party cover. For a work van the policy must include business use; a personal policy that covers "social, domestic and pleasure" plus commuting does not cover driving between jobs, and insurers do decline claims on that basis. Tools stolen from the van are usually a separate question, because most van policies exclude or cap tool theft, which is what standalone tools cover is for.

The covers clients demand anyway

Public liability pays compensation to a third party for injury or property damage (the scaffold board through the conservatory roof, the flood into the flat downstairs) but never the works themselves. No law requires it, yet it is the certificate every site and most domestic customers ask to see. Cover is sold at £1m, £2m and £5m; local-authority and commercial work usually specifies £5m, and the price step from £1m to £2m is typically small relative to the exposure.

Contract works covers the unfinished build itself (fire, storm, flood, theft of materials) which public liability never touches, because the works are your property until handover. Standard building contracts assign who insures the works, so match the policy to the contract rather than buying blind.

Tools and plant. Tools cover replaces hand and power tools, usually with an overnight-in-van condition (locked, alarmed, often "in a locked compound after 9pm") that is the most common reason tool claims fail, so read that clause before buying. Hired-in plant cover matters because plant-hire terms make you liable for the machine from delivery to collection; a stolen mini-digger on hire is your debt, not the hire company's.

The covers by situation: design-and-build firms need professional indemnity for design errors; new-build developers need a 10-year structural warranty because mainstream mortgage lenders require one; one-person bands with no employees can legitimately skip employers' liability, until the first labourer, when it becomes a same-day legal requirement.

Buying it well

Check any insurer or broker on the FCA register before paying, and use BIBA's find-a-broker service to reach specialist construction brokers.
Declare height and depth honestly. Roofing above 10-15 metres, basements and underpinning are rated differently; a claim from undeclared work is a declined claim.
Match cover level to the work you want, not the work you have. A £5m public liability certificate is often the ticket into council frameworks and commercial tenders.
Keep expired employers' liability certificates: HSE advises keeping a complete record because disease claims (asbestos, HAVS, hearing loss) surface decades after the exposure.
Re-quote at renewal with your real turnover and headcount, because premiums track both, and last year's figures silently carry over if you let them.