Building / Extensions / Conversions · 5 cities

Find builders in London, Manchester, Birmingham, Leeds and Bristol

Phone numbers for builders in London, Manchester, Birmingham, Leeds and Bristol. The work on these lists is extensions, loft conversions and refurbishment. Choose a city, then phone the business yourself. This site does not send the job.

An extension or a loft is more than a day rate. Ask what the written package includes. Many extensions, loft conversions and structural openings need building control, and some need planning permission. A listing is not an approval and not a party-wall agreement. Read the cost notes for a sourced national range.

Businesses on this list

62 businesses on this list.

How to read a price for extensions, loft conversions and refurbishment

The Checkatrade house extension cost guide, table last updated June 2026, puts a finished extension at £1,800–£3,000 a square metre excluding VAT, average £2,400. It says builders in London and the South East typically charge more, and that the figures are not location-based. A figure here is not a quote from this site. Checked 14 October 2026.

What to check before you phone

Ask whether the metre rate excludes VAT, and whether building control or planning is still to come. A listing is not that consent.

Which cities have builders on this site?

Open a city to see the names and phone numbers. The cities are London, Manchester, Birmingham, Leeds and Bristol.

If I choose this trade, do you pass the job on?

No. You use the phone number, the email or the website on the record.

How do I read a price for building / extensions / conversions?

The Checkatrade house extension cost guide, table last updated June 2026, puts a finished extension at £1,800–£3,000 a square metre excluding VAT, average £2,400. It says builders in London and the South East typically charge more, and that the figures are not location-based. A figure here is not a quote from this site. Checked 14 October 2026.