Can I sue my builder for unfinished work?
Reviewed by Sean McNamara, 2026-10-07
Unfinished work is the most provable building dispute: the contract says X, the site shows not-X, and the damages are the price of the difference. This page walks the basis, the measurement, and the route.
Damages arithmetic, concretely
Contract: £40,000, you paid £30,000, work 80% done, completion costs £12,000. Approach: damages = completion cost £12,000 - unpaid balance £10,000 = £2,000 net claim (plus consequences like delayed mortgage sign-off if documented). Overclaiming the full £12,000 while holding £10,000 is the fastest way to look unreasonable - quantify properly and settle faster.,
Route by value, with time realities
Under £10k: small claims (no cost risk beyond fees; months). £10k-25k: fast track (costs exposure grows). Above: consider ADJUDICATION - construction contracts have a statutory right to adjudication (weeks, binding until trial, the industry's real dispute tool under the Housing Grants Act). The walk-off disputes adjudication resolves fastest - document-heavy, fact-simple.,
Questions this page answers
- Can I sue my builder for unfinished work?
- Yes: breach of contract (non-completion) and failure of the CRA service standard. Damages = the reasonable cost of completing the works (another builder's quote) minus any unpaid contract balance. Strong cases have: written contract or quote, payment record, dated photos of unfinished state, the completion quotation.
- What should I do if my builder is refusing to complete the work?
- Dated photos of the current state; written notice requiring completion within a stated reasonable time; if passed, two quotes for completion; then the disputes ladder. Don't just hire someone on day 8 - the notice protects you from an argument that you repudiated first.
- How long is a builder liable for their work?
- Non-completion itself: the 6-year contract clock from breach. (Quality defects later follow the same limitation rules - see the liability page.)
- How long is a builder liable for his work in the UK?
- Six years from breach in England and Wales for contract claims, subject to the guarantee terms and any separate insurance-backed warranty.
- Do I have to pay a builder for incomplete work?
- You pay for work COMPLETED that matches the contract, less the cost of finishing the rest. If you paid everything upfront and nothing is finished, the claim is the refund of unearned sums. Never withhold payment for good work as leverage for bad work - separate the two ledgers and the judge will too.
Sources and further reading