From £2,248
Clayhill, IG5
Need an Extension Builder in IG5? C J Construction has been helping local clients (10 mile radius) with their extension buildering jobs for many ye...
From £2,592
DDC BUILDERS LTD is a trusted extension builder serving customers in IG5 and the surrounding area. Contact us to today to get a competitive quote f...
From £2,168
Britbuild Direct is an established and experienced local extension builder in IG5. Please contact us for a free, no obligation quote and competitiv...
From £2,408
We are a British construction company with over 30 years experience in both commercial and residential building work. As a one-stop-shop, we provid...
From £2,104
The Property Box is an established extension buildering business in IG5. We come highly recommended and provide competitive quotes for your work.
From £2,416
Trusted and professional extension builder in IG5. Experienced in all extension buildering work and keeping within budget and on quote. ICCH 2 Buil...
From £2,416
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,136
Slade Building and Construction Ltd is an established extension buildering business in IG5. We come highly recommended and provide competitive quot...
From £2,568
ASV Development Ltd are here to help customers who need an Extension Builder in IG5. We offer a competitive rate to complete all your extension bui...
From £2,656
At Bespoke Interiors Global, building & floor renovations are our passion. We have a holistic and personalised approach and take time to understand...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in IG5 it ranges from £2,104 (The Property Box based in IG4) to £2,656 (ARC Bespoke Interiors based in IG1).
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 IG5 by posting a job with HaMuch and we will send it to extension builders in IG5.
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 - £17,671

Two storey extension - £88,257

Build a timber frame extension - £26,171

Build a swimming pool - £81,171

Single storey extension - £58,424

Side return extension - £43,426

Install an RSJ - £2,371

Outbuilding - £10,171

Build a Mansard loft conversion - £52,171

Loft conversion - £35,355

Build a kitchen extension - £42,171

Hip to gable loft conversion - £42,171

Granny annexe - £87,171

Garden office - £10,171

Convert a Garage - £16,171

Garage - £18,671

Build a flat roof extension - £22,171

Build a dormer loft conversion - £42,171

Concrete foundations - £6,421

Convert a bungalow loft - £29,171

Convert a basement - £39,426