From £18,548
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in BR7. No obligation free quotes ...
From £18,684
Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in BR7. No obligation free quotes and m...
From £19,060
Our homes need to be regularly maintained and from time to time they need to be rejuvenated, modernised and enhanced. When it comes to building wor...
From £18,596
Experienced extension builder ready to quote for your work. Mr is the best extension builder in BR7. No obligation free quotes and many happy custo...
From £18,484
JK Doors is a trusted extension builder serving customers in BR7 and the surrounding area. Contact us to today to get a competitive quote for exten...
From £18,692
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
From £18,892
Need an Extension Builder in BR7? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £18,812
skilled worker who specializes in completing a wide range of building and renovation projects
From £19,116
HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in BR7 and the surrounding area. Contact us to today to get a comp...
From £18,388
Member since April 2025
Trusted and professional extension builder in BR7. Experienced in all extension buildering work and keeping within budget and on quote. GR MAINTENA...

Builders charge between £18,388 (GR MAINTENANCE LTD based in IG11) and £19,116 (HOUSE BUILDING SERVICES LIMITED based in DA16) in BR7 to build a garage, but these costs are only estimates.
Comparing extension builders estimates for building a garage gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get real quotes to build a new garage in BR7 by posting a job with HaMuch and we will send it to extension builders in BR7.
| Borough in London |
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| Garage in Chislehurst |
| Garage in Petts Wood |
| Garage in Sidcup |
| Garage in Bromley |
| Garage in Bexley |
| Garage in Eltham |
| Garage in Keston |
| Garage in Grove Park |
| Garage in Orpington |
| Garage in Bexley |
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,727

Two storey extension - £88,341

Build a timber frame extension - £26,227

Build a swimming pool - £81,227

Single storey extension - £59,544

Side return extension - £44,056

Install an RSJ - £2,427

Outbuilding - £10,227

Build a Mansard loft conversion - £52,227

Loft conversion - £35,880

Build a kitchen extension - £42,227

Hip to gable loft conversion - £42,227

Granny annexe - £87,227

Garden office - £10,227

Convert a Garage - £16,227

Garage - £18,727

Build a flat roof extension - £22,227

Build a dormer loft conversion - £42,227

Concrete foundations - £6,477

Convert a bungalow loft - £29,227

Convert a basement - £40,056