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Whether your week is lime mortar in the conservation core or first fix on a new estate, tell us how your work splits and we’ll shape the cover around it.
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Reviewed by Apex Insurance Brokers · Last reviewed 2026-08-08
Because the town genuinely splits in two, and a builder’s risk profile splits with it. The old core is a market town that grew up in the shadow of a castle — narrow plots, stone and old brick, buildings put up long before cavity walls or damp-proof courses, and a conservation area wrapped around much of it. Then, around the edges, Thornbury has been growing fast: new-build estates, infill plots, and the steady stream of groundworks, first-fix and finishing packages that housing growth generates.
A generic “builder’s policy” prices you as an average of the two. If most of your turnover is delicate conservation-core renovation, you may be under-covered on reinstatement values. If you spend your weeks subcontracting on the new estates, you may be carrying the wrong liability limits for the contracts you sign. The honest starting point is a broker asking which side of Thornbury actually pays your invoices — often it’s both, in which proportion matters.
Three things, and all of them are about money rather than paperwork.
Reinstatement costs run higher than standard rates. If a fire or escape of water wrecks a part-finished renovation of an old Thornbury property, putting it back is not a plasterboard-and-blockwork exercise. Lime plaster, matched stone, joinery made to fit openings that were never square — the materials and the trades that can handle them cost more and take longer to source. Your contract works sum insured needs to reflect the specification you’re actually building to, not a new-build equivalent, or you risk being your own insurer for the shortfall.
The neighbours are old too. Work in a tight historic core usually means working hard against — or physically attached to — other people’s aged buildings. Vibration from breaking out, removal of support during underpinning or structural openings, water finding its way through a shared wall: this is exactly the territory where public liability claims from adjoining owners come from, and where contracts on older buildings sometimes require non-negligence cover (the JCT 6.5.1-type insurance) for damage to neighbouring property that happens even when nobody has done anything wrong. If you’ve never been asked for it, you will be eventually on this kind of work.
Hot works are a bigger deal in old fabric. Torch-applied roofing, soldering, grinding near centuries-dry timber — insurers apply hot-works conditions for a reason, and breaching them (no fire watch, wrong extinguishers to hand) can void the very cover you were relying on. On heritage jobs, read those conditions before you price the job, not after something smoulders.
New-build growth changes the shape of your work: less direct-to-homeowner, more subcontract packages under a principal contractor. That brings contractual demands your policy has to meet before you’re allowed through the site gate.
Public liability is not a legal requirement for builders — that surprises people, but it’s true. It is, however, a near-universal contractual one. Main contractors on housing sites typically specify a minimum indemnity limit, commonly £5 million or more, and will want documentary evidence before you start. If your policy carries a lower limit because it was set up years ago for domestic extensions, that’s a conversation to have before you tender, not the week you’re due on site.
Employers’ liability is different: it is the legal one. Under the Employers’ Liability (Compulsory Insurance) Act 1969, you must hold employers’ liability cover once you employ staff. The trap for Thornbury sole traders scaling up for estate work is labour-only subcontractors — the mate you bring in on a day rate, working under your direction with your materials, generally counts as an employee for this purpose. “He’s self-employed, he sorts his own tax” does not settle the question. If you direct the work, assume you need EL and tell your broker exactly how you use labour, so the policy is rated on reality.
Whichever side of town you work, your tools spend their lives in a van — parked on a half-built estate road during the day, outside your house or a job overnight. Tool theft from vans is one of the most frequent claims tradespeople make anywhere in the UK, and it’s where policy small print bites hardest: overnight theft cover is often limited, excluded, or conditional on the van being locked, alarmed, or emptied. If your policy says tools come out of the van overnight and yours don’t, you have a gap, not cover.
Plant deserves the same honesty. Owned plant needs insuring for what it would cost to replace; hired-in plant is usually your responsibility under the hire terms, including continuing hire charges while a damaged machine is off the road. Estate groundworks in a growing town mean more plant movements, not fewer — make sure the policy matches how much kit you actually touch.
To be clear about who we are: Apex Insurance Brokers is a Bristol-based, FCA-authorised broker arranging cover for clients across the UK, including builders and building firms in Thornbury. We don’t have an office in the town — what we have is the habit of asking the questions this page has been asking: how much of your work is old-fabric renovation, how much is estate subcontracting, how you use labour, what your contracts demand, and what actually sits in the van overnight. The answers decide what good cover looks like for you.
For the full picture of what a builder’s insurance programme can include — liability, contract works, tools, plant and more — see our national guide to builders’ insurance across the UK.
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.
