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J Wijayamohan
Harrow, HA1
JJSR Construction Ltd is an established and experienced local extension builder in HA1. Please contact us for a free, no obligation quote and compe...
Mario Prajar Building Services is an established and experienced local extension builder in HA1. Please contact us for a free, no obligation quote ...
RLC Construction are here to help customers who need an Extension Builder in HA1. We offer a competitive rate to complete all your extension builde...
Need to find an Extension Builder near you for all your extension buildering work?
J K GENERAL BUILDING LTD provides a local, trusted exten...
WHIPP CONSTRUCTION LTD is an established extension buildering business in HA1. We come highly recommended and provide competitive quotes for your w...
C & A Contractors is a trusted extension builder serving customers in HA1 and the surrounding area. Contact us to today to get a competitive quote ...
Relax... you have found a reliable extension builder in HA1. PERFORMA CONSTRUCTION LIMITED is a friendly and reliable company based in HA1 who cons...
UK Food
Need to find an Extension Builder near you for all your extension buildering work?
Mamma V's Caribbean and English Cuisine provides a local...
Platinum Electrics is a Branch off Platinum Premier Projects who deal in all types of construction projects. Platinum Electrics are based in London...
Trusted and professional extension builder in HA1. Experienced in all extension buildering work and keeping within budget and on quote. A D C BUILD...

Building a granny annexe ranges from £86,952 (A D C BUILDERS based in HA1) to £87,432 (Platinum Premier Projects & Premier Electrics based in HA7), 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 HA1 by posting a job with HaMuch. We will send it to extension builders in HA1 who will be happy to help you.
| Borough in London |
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| Granny Annexe in Harrow |
| Granny Annexe in Rayners Lane |
| Granny Annexe in Wealdstone |
| Granny Annexe in Pinner |
| Granny Annexe in Stanmore |
| Granny Annexe in Sudbury |
| Granny Annexe in Wembley |
| Granny Annexe in Greenford |
| Granny Annexe in Northolt |
| Granny Annexe in Ruislip |
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 - £17,650

Two storey extension - £88,226

Build a timber frame extension - £26,150

Build a swimming pool - £81,150

Single storey extension - £58,008

Side return extension - £43,192

Install an RSJ - £2,350

Outbuilding - £10,150

Build a Mansard loft conversion - £52,150

Loft conversion - £35,160

Build a kitchen extension - £42,150

Hip to gable loft conversion - £42,150

Granny annexe - £87,150

Garden office - £10,150

Convert a Garage - £16,150

Garage - £18,650

Build a flat roof extension - £22,150

Build a dormer loft conversion - £42,150

Concrete foundations - £6,400

Convert a bungalow loft - £29,150

Convert a basement - £39,192