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Select your affordable SW16 extension builder
Streatham, SW16
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in SW16. No obligation free quotes...
From £88,200
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 SW16 and the surrounding area. Contact us to today to get a competitive quote...
John Mcdonagh
Watch our short video highlighting all our expertise and services here:
more than 10 y...
Langston Builders is a trusted extension builder serving customers in SW16 and the surrounding area. Contact us to today to get a competitive quote...
Tenfold Renovation
Need to find an Extension Builder near you for all your extension buildering work?
Tenfold Renovation provides a local, trusted extension b...
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 SW16 and the surrounding area. Contact us to today to get a co...
Streatham, SW16
Relax... you have found a reliable extension builder in SW16. PRM BUILDING is a friendly and reliable company based in SW16 who consider no job as ...
QSA Builders Ltd are here to help customers who need an Extension Builder in SW16. We offer a competitive rate to complete all your extension build...

Building a granny annexe ranges from £86,984 (RCB Group Design & Build based in SE21) to £88,200 (Banga Decoration based in CR7), but these are just estimates that can help give you an idea of who will be better value in your area.
The best thing to do is to get quotes to build a granny annexe in SW16 by posting a job with HaMuch. We will send it to extension builders in SW16 who will be happy to help you.
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 - £17,838

Two storey extension - £88,508

Build a timber frame extension - £26,338

Build a swimming pool - £81,338

Single storey extension - £61,768

Side return extension - £45,307

Install an RSJ - £2,538

Outbuilding - £10,338

Build a Mansard loft conversion - £52,338

Loft conversion - £36,923

Build a kitchen extension - £42,338

Hip to gable loft conversion - £42,338

Granny annexe - £87,338

Garden office - £10,338

Convert a Garage - £16,338

Garage - £18,838

Build a flat roof extension - £22,338

Build a dormer loft conversion - £42,338

Concrete foundations - £6,588

Convert a bungalow loft - £29,338

Convert a basement - £41,307