From £2,280
Orpington, BR5
Experienced extension builder ready to quote for your work. Probuilder London Ltd is the best extension builder in BR5. No obligation free quotes a...
From £2,392
Oakmore Builders Limited is a trusted extension builder serving customers in BR5 and the surrounding area. Contact us to today to get a competitive...
From £2,208
Orpington, BR5
LBS Builders is an established and experienced local extension builder in BR5. Please contact us for a free, no obligation quote and competitive ra...
From £2,280
Need an Extension Builder in BR5? Cygnus Construction has been helping local clients (10 mile radius) with their extension buildering jobs for many...
From £2,296
Petts Wood, BR5
Need an Extension Builder in BR5? P&k Building Ltd has been helping local clients (10 mile radius) with their extension buildering jobs for many ye...
From £2,416
Relax... you have found a reliable extension builder in BR5. POVERSET BUILDING COMPANY is a friendly and reliable company based in BR5 who consider...
From £2,064
Petts Wood, BR5
Need an Extension Builder in BR5? RJC BUILDING SERVICES has been helping local clients (10 mile radius) with their extension buildering jobs for ma...
From £2,280
Alpha Construction Building Company ltd. undertakes a wide variety of refurbishment works from roofing, kitchens and bathrooms to lofts extensions ...
From £2,208
Kent, BR5
Ha property services is an established and experienced local extension builder in BR5. Please contact us for a free, no obligation quote and compet...
From £2,536
Our building services company Precise Building Limited have fifteen-year experience of helping customers in Kent and the surrounding area by provid...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in BR5 it ranges from £2,064 (RJC BUILDING SERVICES based in BR5) to £2,536 (Precise Building Limited based in BR5).
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 BR5 by posting a job with HaMuch and we will send it to extension builders in BR5.
| Borough in London |
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| Install An RSJ in Petts Wood |
| Install An RSJ in Orpington |
| Install An RSJ in Chislehurst |
| Install An RSJ in Sidcup |
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| Install An RSJ in Bexley |
| Install An RSJ in Keston |
| Install An RSJ in Bromley |
| Install An RSJ in Bexley |
| Install An RSJ in Eltham |
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 - £17,596

Two storey extension - £88,144

Build a timber frame extension - £26,096

Build a swimming pool - £81,096

Single storey extension - £56,920

Side return extension - £42,580

Install an RSJ - £2,296

Outbuilding - £10,096

Build a Mansard loft conversion - £52,096

Loft conversion - £34,650

Build a kitchen extension - £42,096

Hip to gable loft conversion - £42,096

Granny annexe - £87,096

Garden office - £10,096

Convert a Garage - £16,096

Garage - £18,596

Build a flat roof extension - £22,096

Build a dormer loft conversion - £42,096

Concrete foundations - £6,346

Convert a bungalow loft - £29,096

Convert a basement - £38,580