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Select your affordable IG2 extension builder
Experienced extension builder ready to quote for your work. Render is the best extension builder in IG2. No obligation free quotes and many happy c...
Decorating Building Service are here to help customers who need an Extension Builder in IG2. We offer a competitive rate to complete all your exten...
From £2,376
MIHAI Martolea
Member since September 2026
Fedora and sons Ltd is a trusted extension builder serving customers in IG2 and the surrounding area. Contact us to today to get a competitive quot...
Need an Extension Builder in IG2? MD Building & Project Management Ltd has been helping local clients (10 mile radius) with their extension builder...
M & S Builders is a trusted extension builder serving customers in IG2 and the surrounding area. Contact us to today to get a competitive quote for...
B J CULLEN BUILDERS are here to help customers who need an Extension Builder in IG2. We offer a competitive rate to complete all your extension bui...
Relax... you have found a reliable extension builder in IG2. Major Building Contractors Ltd is a friendly and reliable company based in IG2 who con...
Need to find an Extension Builder near you for all your extension buildering work?
Sz Builders provides a local, trusted extension builderi...
Experienced extension builder ready to quote for your work. Jhon is the best extension builder in IG2. No obligation free quotes and many happy cus...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in IG2 it ranges from £2,096 (Jhon based in IG1) to £2,912 (Render 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 IG2 by posting a job with HaMuch and we will send it to extension builders in IG2.
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