Do Tradesmen Need Contract Works Insurance?
You need contract works insurance whenever you carry the risk for the job you are building before it is handed over. If the contract, or the absence of one, leaves the half-finished work at your door, the answer is yes.
It is never a legal requirement, unlike the employers’ liability inside a tradesman insurance policy. It is a question about who pays to rebuild if something destroys the work before completion.
This guide works through that decision, job type by job type, so you can tell quickly whether it applies to the work you actually do.
Work out who carries the risk for the job before handover, because that answer, not the size of the job, decides whether you need contract works cover. Relying on a main contractor’s policy is riskier than it looks unless you’ve actually read the wording. Make the call job by job rather than assuming one blanket policy fits every contract you take on.
Compare contract works cover before the next job starts.
- Who carries the risk for the works before handover?
- What do standard building contracts say about insuring the works?
- Which trades and job types actually need it?
- Can you rely on the main contractor's policy instead?
- What happens if you go without and something goes wrong?
- Is it ever reasonable to say no?
- How should you make the decision on each job?
- Frequently asked questions (FAQs)
Who carries the risk for the works before handover?
Normally the contractor does, right up to practical completion. Until the client takes possession, the unfinished work is your responsibility to put right at your own cost.
The default position on most jobs
You agreed to deliver a finished result for an agreed price. A fire, a flood or a gale that undoes your progress does not change what you owe the client.
That means you rebuild, out of your own money, and then hand over the job you already quoted. The second build has no income attached to it.
What happens with no written contract
Plenty of domestic work runs on a quote and a handshake. That does not move the risk onto the client, it just removes any chance of arguing that it moved.
Domestic jobs also carry duties under CDM 2015, where the client’s duties pass to the contractor on a single-contractor project. Nobody is quietly insuring the works on your behalf.
Why the client’s buildings policy rarely helps
A householder’s buildings insurance covers the existing house, not an extension being built onto it. Many insurers restrict or suspend cover entirely during major works.
Even where a client does hold cover for the site, it protects them rather than you. Property owners’ liability is a different product again, and it will not fund your reinstatement.
What do standard building contracts say about insuring the works?
JCT and similar standard forms allocate the works insurance duty explicitly, and the allocation changes depending on whether the job is a new build or work to an existing building.
The three common insurance options
JCT standard forms set out lettered insurance options. In broad terms one puts the duty on the contractor for new work, one puts it on the employer for new work, and one deals with work inside or attached to an existing structure.
| Typical option | Who insures the works | Where it is used |
| Contractor insures | You take out all risks cover, usually in joint names | New build projects run by the contractor |
| Employer insures | The client arranges all risks cover for the works | Clients with existing construction insurance in place |
| Existing structures | The client insures both the existing building and the works | Extensions, refurbishments and alterations |
| No named option | Falls back on the contractor by default | Quotes, estimates and handshake domestic jobs |
Reading the insurance clause before you price
The insurance clause tells you whether the cost of a policy belongs in your quote. Finding it after you have won the job is an expensive place to start.
If the client insures, ask for evidence and ask whether your work is named on it. A promise in a clause is not the same as a policy that responds.
Minor works and domestic forms
Shorter standard forms carry the same idea in fewer words. They still say who insures the works, and on most small jobs that is the contractor.
Which trades and job types actually need it?
Anyone building, extending, converting or installing something of real value needs it. Trades that attend, maintain, clean or decorate an existing building usually do not.
The jobs where the answer is yes
- New builds, extensions, loft and garage conversions.
- Structural alterations, underpinning and major refurbishment.
- Full re-roofs, timber frame erection and groundworks.
- Full rewires, full heating system installs and complete bathroom or kitchen fit-outs.
- Any job where materials and part-finished work on site run into five figures.
The jobs where it rarely applies
Reactive call-outs, servicing, small repairs and redecoration leave very little of your own work exposed at the end of the day. A painter and decorator on a two-day job has almost nothing that a storm could destroy.
The same is true of most handyman work and much day-to-day landscaping, though hard landscaping with expensive stone on site can flip the answer.
The grey area in the middle
The test is not your trade, it is the value sitting on site unfinished. Ask what it would cost you to buy the materials again and pay the labour again.
If that number would hurt, you need the cover. If it would not, you probably do not.
Can you rely on the main contractor’s policy instead?
Sometimes, but only where the project policy names or includes subcontractors and you have that in writing. Assuming it is one of the more expensive mistakes in subcontracting.
When project cover does extend to you
On larger sites the principal contractor often insures the whole works in joint names. Where your work forms part of that insured project, a separate policy of your own adds little.
Ask for the certificate and the wording, not a verbal assurance. Check whether subcontracted work is included and whether the insurer waives subrogation against you.
Where the gap opens up
- The policy covers the main contractor’s works but excludes subcontract packages.
- Cover exists but the insurer can recover its outlay from you afterwards.
- Your materials sit in your own yard or van, outside the site address.
- The excess falls on the party responsible, which can mean you.
Getting it confirmed in writing
An email from the contract manager naming the policy and confirming subcontractor inclusion is enough to act on. A line in a tender pack is not.
What happens if you go without and something goes wrong?
You fund the rebuild from your own margin, and you may be in breach of contract at the same time. On a mid-sized job that is a business-ending combination.
Paying for the same job twice
A part-built extension destroyed by fire has to be cleared, rebuilt and finished before you see the rest of the contract sum. The client is not obliged to pay twice for one result.
The ABI reported in January 2026 that 28% of UK sole traders hold no business insurance at all, with median spend among those who do at £250 to £499 a year. A single works loss dwarfs that.
Breach of Contract on Top of the Loss
Where the contract required works insurance and you did not hold it, the failure is a breach in its own right. The client can stop you working, withhold payment or terminate.
That exposure exists from the day you sign, whether or not anything ever gets damaged.
Is it ever reasonable to say no?
Yes. If you only ever do small repairs and maintenance, or the client genuinely insures the works, buying it adds cost without moving much risk.
Small maintenance and repair work
A day rate, a bag of fittings and no standing structure at risk is a thin case for the cover. The premium is real and the exposure is not.
Those trades are usually better served by putting the money into liability limits. Public liability cover is what their clients and schemes actually ask to see.
Where the client insures the works
On some commercial and public sector jobs the employer insures the whole works and names the contractor. Duplicating that with your own policy buys nothing.
Confirm it, then keep a copy in the job file. Arrangements change between tender and site.
The cost side of the decision
Adding a works section to an existing package costs less than buying it standalone, and how much tradesman insurance costs in the UK sets out the shape of those premiums. The premium is also an allowable business expense under HMRC’s guidance for the self-employed.
How should you make the decision on each job?
Run four checks before you price: what the contract says, what is at risk on site, who else is insuring it, and what a total loss would cost you to redo.
The four questions to ask every time
- Does the contract name a works insurance duty, and whose is it?
- What is the peak value of materials and finished work on site?
- Is there a project policy, and does it name subcontractors?
- Could I fund a full rebuild out of retained profit if I had to?
Reviewing the answer at renewal
Trades grow into this cover. The year you take on your first extension is the year the answer changes, and annual cover is easier to hold than a policy per job.
Set the contract value limit against the biggest job you expect to win, not the biggest one you have done. Reviewing what a tradesman policy covers at each renewal keeps the sections matched to the work.
Frequently Asked Questions (FAQs)
No. No statute requires it, but building contracts routinely do, and breaching that requirement is a contractual failure in its own right.
It depends on the work, not the business structure. A sole trader building extensions needs it far more than a limited company doing reactive repairs.
Usually not. Where very little of your own unfinished work sits on site overnight, the premium buys very little protection.
No. Public liability answers claims brought against you by other people, and your own part-finished job is not a third-party claim.
Only if the policy says so. Ask for written confirmation that subcontracted work is included and that the insurer will not recover from you afterwards.
Check it. Most household buildings policies restrict cover during major works and insure the client rather than your contract.
Base it on the largest single job you expect to run, counting labour and materials at full reinstatement cost rather than your quoted price.
Yes. Single-contract cover exists, though annual cover with a maximum contract value is simpler if you take on this kind of work more than once or twice a year.
Yes, where the policy is taken out wholly and exclusively for the business. HMRC treats business insurance as an allowable expense against trading profits.