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Select your affordable SE19 extension builder
From £11,200
Sebastian Banga
Member since August 2025
Banga decoration. Is Base in south London for number of year Banga decoration is a small company. Wich provide an excellent job to the custom...
Robert Buci
Buci builders ltd is a trusted extension builder serving customers in SE19 and the surrounding area. Contact us to today to get a competitive quote...
John Mcdonagh
London, SE19
Watch our short video highlighting all our expertise and services here:
more than 10 y...
Vasi J
No Call out charges!
All Jobs Fully Insured and Guaranteed !!!
All aspects of Plumbing, Heating and Drains....
..."I am very pleased with the work carried out. All very clear and transparent." - ROMFORD,reviewed 10/01/18, KELLY
PW Construction & Renovation Ltd is a trusted extension builder serving customers in SE19 and the surrounding area. Contact us to today to get a co...
Glenn Miller
Relax... you have found a reliable extension builder in SE19. Glenn Miller Builders Limited is a friendly and reliable company based in SE19 who co...
Trusted and professional extension builder in SE19. Experienced in all extension buildering work and keeping within budget and on quote. K S BUILDE...
Need to find an Extension Builder near you for all your extension buildering work?
VDL Construction Ltd provides a local, trusted extension...
Experienced extension builder ready to quote for your work. Top Builders is the best extension builder in SE19. No obligation free quotes and many ...
Experienced extension builder ready to quote for your work. A & P Master Construction is the best extension builder in SE19. No obligation free quo...

Garden offices range from the cheapest of £9,952 (A & P Master Construction based in CR7) to the dearest of £11,200 (Banga Decoration based in CR7), but these are only estimates.
The best way to compare costs is to get actual quotes.
Get rates and quotes to build a garden office in SE19 by posting a job with HaMuch. We'll send it to extension builders in SE19.
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 - £17,824

Two storey extension - £88,486

Build a timber frame extension - £26,324

Build a swimming pool - £81,324

Single storey extension - £61,480

Side return extension - £45,145

Install an RSJ - £2,524

Outbuilding - £10,324

Build a Mansard loft conversion - £52,324

Loft conversion - £36,788

Build a kitchen extension - £42,324

Hip to gable loft conversion - £42,324

Granny annexe - £87,324

Garden office - £10,324

Convert a Garage - £16,324

Garage - £18,824

Build a flat roof extension - £22,324

Build a dormer loft conversion - £42,324

Concrete foundations - £6,574

Convert a bungalow loft - £29,324

Convert a basement - £41,145