Be clear about the job first
Write down what you want done, and for bigger projects get drawings and a specification. Builders can only give comparable quotes if they are all pricing the same thing.
Get at least three written quotes
Ask for a written, itemised quote (a fixed price) rather than an estimate (a rough guide that can change). Check what is included: materials, waste removal, VAT, making good and clearing up. A much lower price than the others is worth questioning.
Check the tradesperson
- Trade body or scheme membership: for example the Federation of Master Builders (FMB) or TrustMark. Check membership on the organisation's own website, not just a logo on a van.
- Registration where the law requires it: gas work must be done by a Gas Safe registered engineer; electricians should be registered with a competent person scheme.
- Insurance: ask to see public liability insurance.
- Reviews and references: read independent reviews and, for big jobs, speak to past customers or visit a finished project.
- A real address and landline or company details, not just a mobile number.
Agree a written contract
For anything beyond a small job, put the agreement in writing. It should cover:
- The scope of work and specification
- The price, and what happens if changes are needed
- Payment stages
- Start and finish dates
- Who obtains planning permission and Building Regulations approval
- Waste removal, working hours and site tidiness
- Guarantees and how problems will be put right
Pay in stages, not upfront
Avoid paying a large sum upfront. Agree stage payments linked to completed work, and keep back a final amount until the job is finished and signed off. Paying larger amounts by credit card can give extra protection under Section 75 of the Consumer Credit Act, where it applies.
Know your rights
- Under the Consumer Rights Act 2015, a trader must carry out a service with reasonable care and skill, within a reasonable time if no time is agreed, and for a reasonable price if no price is agreed.
- If you agree a contract in your home or away from the trader's premises, you usually have a 14-day right to cancel under the Consumer Contracts Regulations.
- Beware of doorstep traders who pressure you to agree to work on the spot. Take your time and get other quotes.
For free advice on a dispute, contact Citizens Advice.
Permissions and sign-off
Larger jobs may need planning permission, Building Regulations approval or a party wall notice. Agree who is responsible for each, and keep every certificate (Building Control completion certificate, electrical and gas certificates, guarantees). You will need them when you sell your home. Rules differ between England, Wales, Scotland and Northern Ireland, so check with your local council.
Last updated: 14 October 2026
