Stuart Cooke
S Cooke Building Services is an established and experienced local extension builder in E18. Please contact us for a free, no obligation quote and c...
ASV Development Ltd are here to help customers who need an Extension Builder in E18. We offer a competitive rate to complete all your extension bui...
UK Drywall Ltd is an established and experienced local extension builder in E18. Please contact us for a free, no obligation quote and competitive ...
Need to find an Extension Builder near you for all your extension buildering work?
Dragan Building Construction provides a local, trusted e...
Ilirjan Sheqja
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
KJ Darby Building Contracts Ltd is an established and experienced local extension builder in E18. Please contact us for a free, no obligation quote...
Expert Crew Ltd is an established and experienced local extension builder in E18. Please contact us for a free, no obligation quote and competitive...
From £86,920
CHRIS BUILDER is an established and experienced local extension builder in E18. Please contact us for a free, no obligation quote and competitive r...
From £87,384
Concept Building Solutions is a trusted extension builder serving customers in E18 and the surrounding area. Contact us to today to get a competiti...
From £86,872
M & D BUILDING & DECORATING are here to help customers who need an Extension Builder in E18. We offer a competitive rate to complete all your exten...

Building a granny annexe ranges from £86,872 (Dragan Building Construction based in E10) to £88,312 (Iservices-uk.org based in E17), 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 E18 by posting a job with HaMuch. We will send it to extension builders in E18 who will be happy to help you.
"Granny annexe" - REDBRIDGE, job posted 10/01/25
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 - £17,749

Two storey extension - £88,373

Build a timber frame extension - £26,249

Build a swimming pool - £81,249

Single storey extension - £59,976

Side return extension - £44,299

Install an RSJ - £2,449

Outbuilding - £10,249

Build a Mansard loft conversion - £52,249

Loft conversion - £36,083

Build a kitchen extension - £42,249

Hip to gable loft conversion - £42,249

Granny annexe - £87,249

Garden office - £10,249

Convert a Garage - £16,249

Garage - £18,749

Build a flat roof extension - £22,249

Build a dormer loft conversion - £42,249

Concrete foundations - £6,499

Convert a bungalow loft - £29,249

Convert a basement - £40,299