From £87,240
The Orchid Group are here to help customers who need an Extension Builder in Botany Bay. We offer a competitive rate to complete all your extension...
From £87,248
Trusted and professional extension builder in Botany Bay. Experienced in all extension buildering work and keeping within budget and on quote. A & ...
From £86,984
W-G LOFTS have over 25 years experience in the construction industry we are based in ENFIELD covering all surrounding areasWe manage your l...
From £87,344
Need an Extension Builder in Botany Bay? Bzone Builders has been helping local clients (10 mile radius) with their extension buildering jobs for ma...
From £87,048
Firtree Building Services Ltd is a trusted extension builder serving customers in Botany Bay and the surrounding area. Contact us to today to get a...
From £87,224
SweepSmart is an established extension buildering business in Botany Bay. We come highly recommended and provide competitive quotes for your work.<...
From £87,432
Experienced extension builder ready to quote for your work. AL Plumbing & Electrical is the best extension builder in Botany Bay. No obligation fre...
From £87,168
We are focused on delivering high quality loft conversions, house extensions, full or partial house refurbishment, also maximising the full potent...
From £87,040
C. Jenkin Builders Limited is an established extension buildering business in Botany Bay. We come highly recommended and provide competitive quotes...
From £86,904
Need to find an Extension Builder near you for all your extension buildering work?
MULBERRY CONSTRUCTION LTD provides a local, trusted exte...

Building a granny annexe ranges from £86,904 (MULBERRY CONSTRUCTION LTD based in N21) to £87,432 (AL Plumbing & Electrical based in EN1), 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 Botany Bay by posting a job with HaMuch. We will send it to extension builders in Botany Bay 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 - £17,663

Two storey extension - £88,245

Build a timber frame extension - £26,163

Build a swimming pool - £81,163

Single storey extension - £58,264

Side return extension - £43,336

Install an RSJ - £2,363

Outbuilding - £10,163

Build a Mansard loft conversion - £52,163

Loft conversion - £35,280

Build a kitchen extension - £42,163

Hip to gable loft conversion - £42,163

Granny annexe - £87,163

Garden office - £10,163

Convert a Garage - £16,163

Garage - £18,663

Build a flat roof extension - £22,163

Build a dormer loft conversion - £42,163

Concrete foundations - £6,413

Convert a bungalow loft - £29,163

Convert a basement - £39,336