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Andy Harris
Andy Harris Construction is an established and experienced local extension builder in Hammersmith. Please contact us for a free, no obligation quot...
Vas Constructs
RUBBERCOVER™ EPDM Permaroof rubber cover and roof system. Lead flashing. NCTS. Timber Frame Buildings. Refurbish fit out, structural ...
Building Vision London Ltd is a trusted extension builder serving customers in Hammersmith and the surrounding area. Contact us to today to get a c...
Red Box are a Fulham-based building and decorating business who work in West and Southwest London, and who specialise in fine interior renovations,...
Relax... you have found a reliable extension builder in Hammersmith. M & A UK Ltd is a friendly and reliable company based in Hammersmith who consi...
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 Hammersmith and the surrounding area. Contact us to today to get a competitiv...
Jonathan Rimmer
Experienced extension builder ready to quote for your work. Mr is the best extension builder in Hammersmith. No obligation free quotes and many hap...
Newpark Construction are here to help customers who need an Extension Builder in Hammersmith. We offer a competitive rate to complete all your exte...
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...

In Hammersmith, prices for dormer loft conversions range from £42,096 (Mr based in NW10) to £43,840 (1st & 2nd Fix Vasconstruct based in W12), but how much your conversion costs will vary depending on the size of your property, how easy access to your roof is and what you want to use the space for.
The best way to get an accurate price is to compare quotes from extension builders in Hammersmith. Post your job on HaMuch now and we'll put you in touch with available extension builders.
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 - £17,949

Two storey extension - £88,673

Build a timber frame extension - £26,449

Build a swimming pool - £81,449

Single storey extension - £63,976

Side return extension - £46,549

Install an RSJ - £2,649

Outbuilding - £10,449

Build a Mansard loft conversion - £52,449

Loft conversion - £37,958

Build a kitchen extension - £42,449

Hip to gable loft conversion - £42,449

Granny annexe - £87,449

Garden office - £10,449

Convert a Garage - £16,449

Garage - £18,949

Build a flat roof extension - £22,449

Build a dormer loft conversion - £42,449

Concrete foundations - £6,699

Convert a bungalow loft - £29,449

Convert a basement - £42,549