Tips for Choosing the Right Builder for Your Extension Project

Building an extension is a big decision, and choosing the right builder for the job is crucial. Here are some tips to help you find the right builder for your extension project:

Research and Read Reviews

Use trusted and vetted sites, like Checkatrade, to research and read reviews from other customers. You can also see if your builder is a member of a trading body, like The Guild of Builders, Federation of Master Builders, National Federation of Builders, and the UK government’s Trust Mark scheme.

Ask for Comparable Written Quotes

Always ask for comparable written quotes from three to five builders. This will help you get a better idea of the average cost of your extension project.

Ask for References and a Portfolio

Ask for references and see if the builder can show you a comparable extension they’ve done for someone else. Also, ask to see their portfolio, so you can see their workmanship and experience.

Work with an Architect

Work with an architect to have clear plans and specifications in place. This will help you stay within budget and ensure that all building regulations are adhered to.

Agree on the Project’s Timescales

Agree on the project’s timescales with your builder. This will help keep costs under control and ensure that everyone stays focused on the project.

Get to Know Your Prospective Builder

To get to know your prospective builder, ask them important questions like:

  • What type of work have you previously done?
  • Have you worked on an extension similar to this one in the past year? And, can I see it?
  • Can you give me a written quote inclusive of; plans and construction drawings, and a full specification of all materials, fixtures, fittings, and finishes?
  • How will you factor in allowances for the provisional sums?
  • Who are you insured with and what does it cover?
  • Are you familiar with planning regulations? And, will my extension be affected by them?
  • Do you have Builders Public Liability insurance? And, what other insurance coverage do you have?
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Hiring a Builder Checklist

Here’s a handy checklist to keep in mind when hiring a builder:

  • Use a trusted and vetted site, like Checkatrade.
  • Ask friends and family if they have any builder recommendations.
  • See if your builder is a member of a trading body.
  • Be careful if a builder makes an unsolicited call to your home claiming they’ve noticed structural issues or damage to your home.
  • Check that they have adequate insurance.
  • See if they have done similar building work before.


Hiring the right builder is crucial for the success of your extension project. By doing thorough research, asking important questions, and following these tips, you can find the right builder for your extension project. Remember, building an extension is a big decision, but with the right builder, it can be a stress-free and exciting experience.