Builders
Understand the work behind the price.
Give builders a consistent brief and make the important differences in their quotations visible: the specification, allowances, exclusions and timing.
Your area. Your shortlist.
Find your local shortlist.
Enter any UK postcode to find researched firms and compare your options.
No contact details needed. Build budget means the total project value, not the designer’s fee.
Available in this beta: save your extension project, request each service separately and compare quotations you already have. The team reviews requests first. Postcode search lists researched firms across the UK, separately labelled from CYB-approved firms with confirmed coverage. Confirm each firm’s service area and availability. Verified customer reviews are not available yet.
Is this your next step?
When this service can help
You want to understand a construction budget, are preparing to get quotes, or already have drawings ready for pricing. You can start with an idea; a detailed quote may need more information.
What to have ready
Your latest drawings and specification if you have them, plus any decisions on finishes and timing. Tell us what is still undecided.
Discuss the scope
A quotation should explain which of these are included.
- Agreed drawings and specification
- Structural work, roof and glazing
- Drainage, services and finishes
- Programme and payment stages
Look beyond the total
Questions to compare fairly
The calculator provides an early budgeting range. It is not a quotation from a builder, and professional availability must be confirmed for your project.
- Are both quotes based on the same drawing revision?
- What is excluded or only provisionally allowed for?
- How is VAT treated and what is the total payable?
- What could change the price or start date?
Start with your own project.
Your answers help the team understand the work you need.