Do builders need written contracts?

If you are a builder, plumber, electrician or any other tradesperson carrying out work on someone's home, you might wonder whether you actually need a written contract. The short answer: while verbal agreements are technically binding, operating without one is a gamble most tradespeople cannot afford to take.

What does the law say?

Under the Consumer Rights Act 2015, any service provided to a consumer must be carried out with reasonable care and skill, within a reasonable time, and for a reasonable price (if no price was agreed). These protections apply whether or not there is a written contract.

However, a verbal agreement is much harder to enforce. If a dispute arises, it becomes your word against the homeowner's. A written contract gives both sides a clear reference point for what was agreed.

A written contract is not about distrust — it is about making sure both sides remember the same conversation six weeks later.

What should a building contract cover?

A good contract does not need to be long or complicated. At a minimum, it should cover:

• Scope of works — a clear description of what will be done (and what will not)
• Price — the total cost, whether it includes VAT, and how payments are structured
• Timescales — start date, expected completion date, and what happens if there are delays
• Payment terms — when payments are due and how they are made
• Changes — how variations or extras are handled and agreed
• Defects — what happens if problems are found after completion

For a detailed walkthrough of each clause with plain-English explanations, see our complete building contract checklist.

Practical benefits of written contracts

Beyond the legal protection, written contracts improve the working relationship. They set clear expectations from the start, reduce misunderstandings, and give both parties confidence that the job will be managed fairly.

For tradespeople, a professional contract also signals credibility. Homeowners are more likely to trust — and recommend — a builder who puts everything in writing.

What about templates?

Generic templates can be a starting point, but they often miss important details or include language that does not apply to your situation. The best approach is a contract that is tailored to the specific job while covering the essential terms.

TradeContract is designed to make this easy. You answer a few questions about the job and the system generates a professional contract that covers the key terms. Both sides can review and accept it, and every change is recorded.

The bottom line

You do not legally need a written contract for domestic building work, but operating without one is a risk that is entirely avoidable. A written agreement protects your business, protects your customer, and makes the whole job run more smoothly. For a practical look at how quick and easy modern contracts can be, see our guide on the 5-minute contract for tradespeople.