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Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in Thornton Heath. No obligation f...
Gani Bush
Gb construction are here to help customers who need an Extension Builder in Thornton Heath. We offer a competitive rate to complete all your exten...
John Mcdonagh
Watch our short video highlighting all our expertise and services here:
more than 10 y...
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 Thornton Heath and the surrounding area. Contact us to today to get a competi...
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 Thornton Heath and the surrounding area. Contact us to today t...
Glenn Miller
Relax... you have found a reliable extension builder in Thornton Heath. Glenn Miller Builders Limited is a friendly and reliable company based in T...
Relax... you have found a reliable extension builder in Thornton Heath. PRM BUILDING is a friendly and reliable company based in Thornton Heath who...
QSA Builders Ltd are here to help customers who need an Extension Builder in Thornton Heath. We offer a competitive rate to complete all your exten...

Outbuilding costs in Thornton Heath range from the cheapest of £9,984 (RCB Group Design & Build based in SE21) to the dearest of £11,200 (Banga Decoration based in CR7), but these are just estimates.
Comparing extension builders estimates for building an outbuilding gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get rates and quotes to build an outbuilding in Thornton Heath by posting a job with HaMuch and we will send it to extension builders.
"Build an outbuilding" - SOUTH NORWOOD, job posted 03/02/25
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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 - £17,863

Two storey extension - £88,545

Build a timber frame extension - £26,363

Build a swimming pool - £81,363

Single storey extension - £62,264

Side return extension - £45,586

Install an RSJ - £2,563

Outbuilding - £10,363

Build a Mansard loft conversion - £52,363

Loft conversion - £37,155

Build a kitchen extension - £42,363

Hip to gable loft conversion - £42,363

Granny annexe - £87,363

Garden office - £10,363

Convert a Garage - £16,363

Garage - £18,863

Build a flat roof extension - £22,363

Build a dormer loft conversion - £42,363

Concrete foundations - £6,613

Convert a bungalow loft - £29,363

Convert a basement - £41,586