Your extension. Your quote. In 60 seconds.
Get your free extension quote in 60 seconds
Answer six quick questions about your property and see an indicative extension quote straight away, with a copy emailed to you.
A suitable local builder will then contact you to arrange a free, no-obligation site survey.
- Completely free to use
- Takes around 60 seconds
- Your quote emailed to you
- Free no-obligation site survey
Tell us about your property
Answer six quick questions about your home and the extension you want.
See your estimate
Receive an indicative extension cost range immediately.
Arrange your free survey
A suitable local builder will contact you to arrange a free site visit.
Step 1 of 2
Tell us about your property
Rough answers are fine. We use your property details to estimate the likely size and cost of the extension. All estimates assume a standard builder’s finish.
Question 1 of 6
What kind of extension are you planning?
Question 2 of 6
What type of property is it?
Question 3 of 6
How is it attached?
Question 4 of 6
Approximate size of the extension
Enter the floor area in square metres, or pick a rough size band.
Question 5 of 6
How many storeys will the extension be?
Question 6 of 6 · Optional
Anything else included in the work?
Select all that apply.
No credit card required. Our estimate is based on typical UK build costs and the information you provide.
The Build Extension Quotes Guide to Extending Your Home
A free, plain-English guide to UK extension types, planning permission, build stages and what affects extension prices. No details required.
How Build Extension Quotes works
- 1Tell us about your property
- 2See your estimated cost range
- 3Receive a free site survey
- 4Decide whether you wish to proceed
Why use Build Extension Quotes?
- Free online estimate
- Clear indicative price range
- Free site survey
- No obligation
- Quick and simple process
- Suitable local builder
Extension work covered
- Single-storey rear extensions
- Side return extensions
- Wrap-around extensions
- Double-storey extensions
- Garage conversions
- Kitchen extensions
- Orangeries and conservatories
- Porches and entrance halls
- Structural openings and steels
- Loft and roof alterations
Common questions
How accurate is the estimate?
It is an indicative range built from typical UK build rates and the answers you give. The firm price is confirmed after a builder surveys your property.
Does it cost anything?
No. The estimate and the site survey are both free, and there is no obligation to proceed.
Do I need planning permission?
Many single-storey rear extensions fall under permitted development, but double-storey work, flats and conservation areas usually need permission. Our free guide explains the limits.
What happens to my details?
They are used to prepare your estimate and to pass your enquiry to a suitable local builder for the free survey.