Reviewed by Sean McNamara, 2026-10-07
The letter is 80% of an incomplete-work dispute. Written properly, most builders re-engage; written badly, you hand them a defence. This is the structure that works - and the traps that don't.
Every sentence should be checkable: dates, amounts, scope items, deadline. No accusations ('cowboy', 'shambles') - they feel good and read badly in front of a judge. The builder's own review responses will be emotional; yours won't. That contrast wins in adjudication and in court.
1) Every incomplete item genuinely part of the agreed scope (not scope creep you remember wanting). 2) Payments to date reconciled against work completed - overpayment weakens your position; underpayment strengthens theirs. 3) The deadline you set is reasonable - a 7-day demand for a roof makes you look unreasonable; 21 days for snagging reads fair.
Structure: 1) Contract reference (even 'our agreement of [date]' for verbal contracts). 2) Itemised list of incomplete/defective work, each against the agreed scope. 3) Statutory hook: Consumer Rights Act 2015 - reasonable care, skill and time. 4) Deadline (14-28 days, reasonable). 5) Consequence: alternative contractor engagement at their cost, then legal action. 6) Send tracked, keep copies.
The letter is step two; step one was the informal request. Step three, if the deadline passes: letter before action under the Pre-Action Protocol. Between them, quantify: photos of each incomplete item, costs of completion from other contractors (get two quotes), and payments made to date.
Refusal in writing is actually useful evidence - it converts delay into clear breach. Respond with the same completion-demand letter, noting their refusal, and set the cure deadline. Refusal + missed deadline = strong grounds to engage a replacement contractor and claim the extra cost.
Same letter, plus one paragraph: the date work stopped, the state of the site at abandonment (photos attached), and your reservation of rights. Walking off mid-job usually amounts to repudiatory breach - but do NOT declare the contract terminated yourself until you have checked the contract or had the termination step reviewed; wrongful termination is the classic own-goal.
Documented claims under £10,000 in the small claims track: usually yes - modest fees, no lawyers needed, photo-led evidence works. The letter you send now becomes Exhibit A. Above £10,000, factor in fast-track costs and consider construction adjudication where the contract allows.
Contract damages compensate financial loss, not stress. Where the work involved a consumer contract, distress damages remain exceptional. Focus the claim on: completion costs, delay costs (alternative accommodation, storage), and any remedial work - the categories that actually recover money.