Guide · Contracts · 6 min read
Written contracts and variations that hold up
A contract is not a sign of distrust — it is the document that protects a good builder when a project changes, and domestic projects almost always change.
What a domestic contract should cover
- Full scope of works, with clear exclusions
- Price, payment stages and what triggers each release
- Programme dates and how delays outside your control are handled
- Materials, provisional sums and what happens if prices move
- Access, working hours, welfare and site responsibilities
- Defects, warranty and the complaints procedure
- Cancellation rights where consumer regulations apply
Handle variations in writing, every time
The pattern is familiar: a customer asks for a change on site, work continues, and the cost surfaces on the final invoice. By then the goodwill has gone.
A one-page variation record — what changed, why, the cost, the time impact and a signature or written confirmation — takes minutes and prevents most final-account arguments.
Keep the contract file with the project record
Contracts, variations, invoices and stage evidence belong together. When they live in one project record, answering a query a year later takes minutes rather than an afternoon of searching.
Find your gaps in two minutes
The free Builder Standard Assessment scores you out of 100 across contracts, payments, records, customer care and insurance, then shows exactly where you are losing marks. If documents or processes are missing, the £295 Professional Standards Audit helps you compile them.
This guidance is general information, not legal advice. Builder Standard is an independent platform and is not a government body, statutory regulator or government-endorsed scheme, and it cannot register or certify contractors for any government scheme.
Questions
Common questions
Do I need a contract for small jobs?
A proportionate written agreement is sensible on any paid job. Even a short scope, price and payment schedule in writing is far stronger than a verbal quote.
Does Builder Standard provide legal advice?
No. This is general good-practice guidance, not legal advice. For contract terms specific to your business, take professional legal advice.
Keep reading
Related guides and checklists
Compliance
The UK builder compliance checklist
Twenty-eight things a professional UK contractor should be able to produce on request — grouped by contracts, insurance, records, safety and customer care.
Payments
Stage payments without the arguments
Structure releases around defined stages and evidence, not calendar dates, and most payment friction disappears.
Customer care
Writing a complaints procedure customers trust
A short, clear complaints procedure issued up front is one of the cheapest reputation protections available to a contractor.