From £2,456
Greater London, N10
Relax... you have found a reliable extension builder in N10. PLAN C - Design. Build. Create is a friendly and reliable company based in N10 who co...
From £2,512
We are builders with a difference.We are proud to be a family business. Brothers Pierre and Christian Carboni established PLAN C in 2011, having pr...
From £2,504
Muswell Hill, N10
N10 Building Contractors Ltd are here to help customers who need an Extension Builder in N10. We offer a competitive rate to complete all your exte...
From £2,224
Need an Extension Builder in N10? Ally Electrical Services Ltd has been helping local clients (5 mile radius) with their extension buildering jobs ...
From £2,496
Greater London, N10
Property maintenance service, hold a pool of tradesmen ready to work.
From £2,568
Relax... you have found a reliable extension builder in N10. CM Build is a friendly and reliable company based in N10 who consider no job as too bi...
From £2,224
Greater London, N10
Whether it's garden design, a garden studio or home renovations - we can do it. What you show me, what you imagine, we can build. Contact us now fo...
From £2,472
Galaia Limited are here to help customers who need an Extension Builder in N10. We offer a competitive rate to complete all your extension builderi...
From £2,280
London, N10
Trusted and professional extension builder in N10. Experienced in all extension buildering work and keeping within budget and on quote. Arundell As...
From £2,392
SJ Expert Building Services are here to help customers who need an Extension Builder in N10. We offer a competitive rate to complete all your exten...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in N10 it ranges from £2,224 (Ally Electrical Services Ltd based in N10) to £2,568 (CM Build based in N10).
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 N10 by posting a job with HaMuch and we will send it to extension builders in N10.
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 - £17,713

Two storey extension - £88,319

Build a timber frame extension - £26,213

Build a swimming pool - £81,213

Single storey extension - £59,256

Side return extension - £43,894

Install an RSJ - £2,413

Outbuilding - £10,213

Build a Mansard loft conversion - £52,213

Loft conversion - £35,745

Build a kitchen extension - £42,213

Hip to gable loft conversion - £42,213

Granny annexe - £87,213

Garden office - £10,213

Convert a Garage - £16,213

Garage - £18,713

Build a flat roof extension - £22,213

Build a dormer loft conversion - £42,213

Concrete foundations - £6,463

Convert a bungalow loft - £29,213

Convert a basement - £39,894