From £2,256
East Dulwich, SE22
Experienced extension builder ready to quote for your work. The Perfectionist is the best extension builder in SE22. No obligation free quotes and ...
From £2,536
Our locally run, family building services company J&S Property Services has 65 years combined experience. We have been helping customers in London ...
From £2,080
East Dulwich, SE22
FRIERN BUILDING LTD is an established extension buildering business in SE22. We come highly recommended and provide competitive quotes for your wor...
From £2,224
We do all aspect of work in construction from basement to new build loft extension refurbishments
From £2,192
London, SE22
Five Sextillion is an established and experienced local extension builder in SE22. Please contact us for a free, no obligation quote and competitiv...
From £2,472
BERNARD CONSTRUCTION LTD are here to help customers who need an Extension Builder in SE22. We offer a competitive rate to complete all your extensi...
From £2,320
Global Business BoxLttd are here to help customers who need an Extension Builder in SE22. We offer a competitive rate to complete all your extensio...
From £2,704
Business Email:info@ Glazing & Boarding With local glaziers available 24 hours a day, 7 days a week we...
From £2,224
Greater London, SE22
James Hall Property Solutions Ltd is a trusted extension builder serving customers in SE22 and the surrounding area. Contact us to today to get a c...
From £2,408
Trusted and professional extension builder in SE22. Experienced in all extension buildering work and keeping within budget and on quote. Vidanov Bu...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SE22 it ranges from £2,080 (FRIERN BUILDING LTD based in SE22) to £2,704 (Babar Jeweler Shop based in SE21).
Comparing extension builders estimates for fitting an RSJ gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get rates and quotes to install an RSJ in SE22 by posting a job with HaMuch and we will send it to extension builders in SE22.
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 - £17,642

Two storey extension - £88,212

Build a timber frame extension - £26,142

Build a swimming pool - £81,142

Single storey extension - £57,832

Side return extension - £43,093

Install an RSJ - £2,342

Outbuilding - £10,142

Build a Mansard loft conversion - £52,142

Loft conversion - £35,078

Build a kitchen extension - £42,142

Hip to gable loft conversion - £42,142

Granny annexe - £87,142

Garden office - £10,142

Convert a Garage - £16,142

Garage - £18,642

Build a flat roof extension - £22,142

Build a dormer loft conversion - £42,142

Concrete foundations - £6,392

Convert a bungalow loft - £29,142

Convert a basement - £39,093