From £33,150
Trusted and professional extension builder in Richmond Upon Thames. Experienced in all extension buildering work and keeping within budget and on q...
From £36,600
Silver Horizon Installers Ltd is an established extension buildering business in Richmond Upon Thames. We come highly recommended and provide compe...
From £33,600
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £34,575
Cube Lofts is an established and experienced local extension builder in Richmond Upon Thames. Please contact us for a free, no obligation quote and...
From £35,175
IMKO is an established and experienced local extension builder in Richmond Upon Thames. Please contact us for a free, no obligation quote and compe...
From £36,375
Need to find an Extension Builder near you for all your extension buildering work?
Sharp Projects London Limited provides a local, trusted ...
From £36,525
B26 Ltd is an established and experienced local extension builder in Richmond Upon Thames. Please contact us for a free, no obligation quote and co...
From £36,375
Need to find an Extension Builder near you for all your extension buildering work?
D GAFFNEY D G BUILDERS & CO provides a local, trusted ex...
From £33,075
Relax... you have found a reliable extension builder in Richmond Upon Thames. REED CONSTRUCTION LTD is a friendly and reliable company based in Ric...
From £32,850
Masterbuild & Design Ltd is an established and experienced local extension builder in Richmond Upon Thames. Please contact us for a free, no obliga...

Comparing extension builders estimates for Loft conversion gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for the cost of a loft conversion in Richmond Upon Thames by posting your job to extension builders in Richmond Upon Thames.
"Loft conversion of a small 3 bed end of terrace. Currently gang nail truss. Ending up with 3 velux to the front and a pitched dormer to the rear. Architect and engineer plans available." - WEST MOLESEY, job posted 09/08/25
"Loft conversion" - KINGSTON UPON THAMES, job posted 01/01/70
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 - £17,615

Two storey extension - £88,173

Build a timber frame extension - £26,115

Build a swimming pool - £81,115

Single storey extension - £57,304

Side return extension - £42,796

Install an RSJ - £2,315

Outbuilding - £10,115

Build a Mansard loft conversion - £52,115

Loft conversion - £34,830

Build a kitchen extension - £42,115

Hip to gable loft conversion - £42,115

Granny annexe - £87,115

Garden office - £10,115

Convert a Garage - £16,115

Garage - £18,615

Build a flat roof extension - £22,115

Build a dormer loft conversion - £42,115

Concrete foundations - £6,365

Convert a bungalow loft - £29,115

Convert a basement - £38,796