Builders Insurance in the UK: What General Builders Actually Need

Reviewed by Matthew Bartlett, Director, Apex Insurance Brokers Limited · Last reviewed 2026-08-06

Building work sits at the sharp end of insurance for a reason. You work on other people's property, often occupied while you're there. You dig near services you didn't install, put people at height, bring heat and heavy plant onto site, and leave materials and tools somewhere overnight. A single bad afternoon – a grinder spark landing in loft insulation, a compression fitting letting go over a weekend – can produce a claim worth more than several years of your turnover.

This page walks through the covers that matter for general building firms and sole-trader builders in the UK: what the law actually requires, what's driven by contract, and where the common gaps sit. It's written for the builder pricing an extension in Solihull just as much as the eight-van firm running domestic and light commercial work across a region.

What insurance does a builder actually need?

Only one of these covers is compulsory by statute, and only in one circumstance – but a working builder's programme usually includes most of the following:

• Public liability (PL) – injury to third parties and damage to property that isn't yours. Not a legal requirement, but effectively mandatory in practice.
• Employers' liability (EL) – legally required under the Employers' Liability (Compulsory Insurance) Act 1969 if you employ staff, and that generally includes labour-only subcontractors.
• Contract works – the job itself: the partly built structure and materials on site, against fire, storm, theft, vandalism and similar perils.
• Tools and plant – your own kit, plus hired-in plant you're contractually responsible for.
• Personal accident and sickness – income protection if injury or illness stops you working, particularly important for sole traders who have no EL cover for themselves.

If you run vans or wagons, motor insurance is a separate legal requirement under the Road Traffic Act 1988 – a commercial vehicle policy sits alongside the trade covers above, not inside them.

Is public liability insurance a legal requirement for builders?

No – and it's worth being precise about this, because plenty of websites blur it. There is no UK statute compelling a builder to hold public liability insurance. What makes it non-negotiable is everything else: main contractors won't let you on site without it, local authority frameworks specify it, many clients' architects and contract administrators check it before work starts, and a JCT or similar building contract will typically oblige you to carry it.

For a builder, PL responds when your work injures someone who isn't your employee, or damages property you don't own and aren't working on. Think of the scaffold board that drops onto a parked car, the customer who trips over trailing cable, or the neighbouring property that takes water damage when a soil stack is disturbed. One of the most expensive recurring builder claims is the underground service strike – cutting through an electricity cable or gas main during groundworks – so if you dig, tell your broker, and check how your policy treats it.

Watch the conditions as closely as the limit. Builders' liability policies commonly carry restrictions or warranties around work at height above a stated level, work below a stated depth, and heat work – blowtorches, hot air guns, grinders, bitumen boilers. A hot works condition typically requires specific precautions and a fire watch after the work finishes. Breach the condition and a fire claim can be declined, which for a builder is the difference between a bad month and losing the business.

Do I need employers' liability if I only use subcontractors?

This is the question that catches more builders out than any other. Under the Employers' Liability (Compulsory Insurance) Act 1969, you must hold employers' liability insurance if you employ people – and for insurance purposes, labour-only subcontractors are generally treated as employees. If you supply the materials, direct the work and pay someone for their labour, the fact that they invoice you rather than appear on PAYE usually doesn't change the position: they'll typically count as an employee, and you need EL in place.

Bona fide subcontractors – firms working under their own direction, with their own materials, insurance and public liability cover – are treated differently. They generally sit under your public liability exposure rather than EL, but insurers will expect you to check they carry their own PL at an adequate limit before they start. Get in the habit of collecting subcontractors' insurance documents each year; it's exactly what a main contractor does to you, and it's what your insurer will ask about after a claim.

EL policies in the UK are typically written with a £10 million limit of indemnity as standard, and you're required to hold at least the statutory minimum level of cover. Sole traders genuinely working alone, with no help on the tools, are outside the compulsory requirement – but the moment a mate helps you strike a scaffold for a day's cash, you're an employer. If your staffing flexes job to job, say so when you buy the policy rather than after someone's hurt.

What is contract works insurance and why do builders need it?

Public liability protects other people's property – it does nothing for the job you're building. Contract works cover fills that gap: it insures the works in progress and the unfixed materials on site against perils such as fire, storm, flood, theft and malicious damage. If a half-built extension burns down the night before plastering, contract works is what pays to rebuild it. Without it, you'd be redoing months of work at your own cost, because the client's obligation to pay is for a finished job.

Three practical points. First, set the sum insured at the full rebuild value of your largest typical contract – including materials, your labour and an allowance for debris removal and professional fees – not just your profit margin. Second, check who the contract makes responsible for insuring the works: JCT contracts allocate this differently depending on the option chosen, and on renovation or extension work the split between insuring the new works and the existing structure matters enormously. Third, tell your broker about the odd bigger job. A policy rated for £80,000 extensions won't quietly stretch to a £400,000 new build.

Larger or more complex risk? Speak directly to a director — call 0117 325 0027 or email info@apexinsurancebrokers.co.uk.

How do I insure my tools and plant?

Tool theft is one of the most frequent claims builders make, and vans are the target. Most tools policies apply an overnight theft condition: cover for tools left in a vehicle overnight usually applies only if the vehicle is locked, often with forcible entry required as evidence, and some policies restrict or exclude overnight cover altogether unless the van is garaged or in a secured compound. Read that condition before you need it, and insure tools at replacement-as-new values – a wear-and-tear deduction on a five-year-old kit list is a miserable surprise.

Owned plant – mixers, breakers, towers, small excavators – can be insured against damage and theft in the same section or a dedicated one. Hired-in plant deserves particular attention: hire agreements commonly make you responsible for the plant while it's in your care, including continuing hire charges while a damaged or stolen machine is replaced. Hired-in plant cover picks up both the machine and, where included, those ongoing charges. If you hire regularly, an annual hired-in plant section is almost always tidier than relying on the hire company's waiver each time.

What about personal accident cover for a sole-trader builder?

Employers' liability protects your employees. Nothing in a standard liability programme pays you if you fall from a scaffold and can't work for four months. For a sole trader, or a small firm built around one or two key people on the tools, personal accident and sickness cover is the piece that keeps the mortgage paid: a weekly benefit while you can't work, and lump sums for specified serious injuries. It's inexpensive relative to the rest of the programme and routinely overlooked. If your income stops when your body stops, it belongs on the schedule.

What limits will main contractors and local authorities ask for?

Public liability is bought at a limit of indemnity, and the market convention is £1 million, £2 million or £5 million, with higher limits available where a contract demands them – these are illustrative options, not recommendations. What drives your choice is usually contractual: main contractors commonly stipulate a minimum PL limit in their subcontract terms, and local authority and housing association frameworks typically set their own requirements as a condition of tendering. Ask for the insurance requirements before you price the job, not after you've won it – upgrading a limit mid-policy is possible, but doing it under deadline pressure the week you're due on site is avoidable.

Beyond the headline limit, watch for specific contractual requests: an indemnity to principal clause (extending your policy to indemnify the main contractor or employer for claims arising from your work), evidence of EL and contract works cover, and occasionally non-negligence cover for damage to neighbouring property from collapse, vibration or weakening of support – a requirement that appears in some JCT contracts. None of these are exotic, but they need to be arranged deliberately. A broker who works with builders will recognise the wording on sight; send us the contract's insurance clauses and we'll check them against your policy before you sign.

What do builders' insurance claims actually look like?

The claims that recur in this trade are remarkably consistent. Escape of water is a big one: a first-fix plumbing joint or an isolated pipe that lets go after the team leaves on Friday, saturating a finished kitchen two floors down. Fire following hot works – roofing torches and grinding sparks especially – produces the severe losses. Groundworks bring service strikes and, on tight urban plots, damage to neighbouring structures from excavation near shared walls. Falls from height remain the serious-injury pattern across UK construction, which is why insurers ask hard questions about your work above certain heights and your use of scaffolding versus ladders. And theft – from vans overnight and from open sites – is the steady drumbeat underneath it all.

Two habits improve almost every claim outcome: photograph the site and your precautions as you go (hot works permits, isolation of services, securing of the site at night), and notify your broker early. Late notification is one of the most common self-inflicted problems in liability claims – if a customer mentions an injury or a neighbour mentions a crack, report it even if you think it's nothing.

How much does builders insurance cost?

There's no honest flat answer, so we won't invent one. Premiums are rated on the shape of your business: turnover and wageroll, the split between employees and subcontractors, the type of work (extensions and refurbishment rate differently from new build, groundworks or anything structural), maximum heights and depths, use of heat, your largest contract value, and your claims history. A tidy five-year claims record and clear answers on heights, depths and hot works genuinely move the price. The most expensive policy is the cheap one that doesn't respond – a declined fire claim over an unmet hot works condition costs more than a decade of premium savings.

Why arrange builders insurance through Apex?

Apex Insurance Brokers is an independent, FCA-authorised broker based in Bristol, arranging cover for building trades across the UK. We deal with builders daily, so the conversation starts from how your firm actually works – who's on the books, who's labour-only, what the biggest job looks like, what the main contractor's paperwork demands – and the policy is built around that, with the conditions explained in plain terms before you buy. When something goes wrong, you deal with people who know your file, not a call centre reading a script.

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