Building Vision London Ltd is a trusted extension builder serving customers in Chiswick and the surrounding area. Contact us to today to get a comp...
Need to find an Extension Builder near you for all your extension buildering work?
AJ Wells provides a local, trusted extension buildering ...
AG-Renovation Ltd is a trusted extension builder serving customers in Chiswick and the surrounding area. Contact us to today to get a competitive q...
Newpark Construction are here to help customers who need an Extension Builder in Chiswick. We offer a competitive rate to complete all your extensi...
At Ferdas Design & Build Ltd we have been fitting bespoke bathrooms since 2013. We pride ourselves on being the go-to bathroom fitters for discerni...
Tomasz Pedowicz
Hi we have 15 years of experience in building and construction industry our specialization is bathrooms and renovations please have a look at the w...
Elite Construction London Ltd
Elite Construction London Ltd has been one of the top providers of building and remodeling services in London for more than ten years.Our goal is ...
Red Box are a Fulham-based building and decorating business who work in West and Southwest London, and who specialise in fine interior renovations,...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Andy Harris
Andy Harris Construction is an established and experienced local extension builder in Chiswick. Please contact us for a free, no obligation quote a...

Building a granny annexe ranges from £86,904 (Elite Construction London Ltd based in TW8) to £87,504 (Ferdas Design & Build Ltd based in W3), 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 Chiswick by posting a job with HaMuch. We will send it to extension builders in Chiswick who will be happy to help you.
| Borough in London |
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| Granny Annexe in Chiswick |
| Granny Annexe in Acton |
| Granny Annexe in Barnes |
| Granny Annexe in Hammersmith |
| Granny Annexe in Mortlake |
| Granny Annexe in Shepherd's Bush |
| Granny Annexe in Brentford |
| Granny Annexe in Kew |
| Granny Annexe in Ealing |
| Granny Annexe in West Kensington |
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 - £17,754

Two storey extension - £88,380

Build a timber frame extension - £26,254

Build a swimming pool - £81,254

Single storey extension - £60,072

Side return extension - £44,353

Install an RSJ - £2,454

Outbuilding - £10,254

Build a Mansard loft conversion - £52,254

Loft conversion - £36,128

Build a kitchen extension - £42,254

Hip to gable loft conversion - £42,254

Granny annexe - £87,254

Garden office - £10,254

Convert a Garage - £16,254

Garage - £18,754

Build a flat roof extension - £22,254

Build a dormer loft conversion - £42,254

Concrete foundations - £6,504

Convert a bungalow loft - £29,254

Convert a basement - £40,353