From £2,344
Hertfordshire, WD17
Primrose Projects is an established and experienced local extension builder in WD17. Please contact us for a free, no obligation quote and competit...
From £2,624
Experienced extension builder ready to quote for your work. 1st Choice Builders UK is the best extension builder in WD17. No obligation free quotes...
From £2,112
Experienced extension builder ready to quote for your work. Progressive Design London is the best extension builder in WD17. No obligation free quo...
From £2,208
Our building services company Conversion Property and Electrical Services has 17 years of experience in the industry. We have been helping customer...
From £2,224
A&T Building is an established extension buildering business in WD17. We come highly recommended and provide competitive quotes for your work.
...From £2,472
Relax... you have found a reliable extension builder in WD17. Tonybuild is a friendly and reliable company based in WD17 who consider no job as too...
From £2,424
T N Roofing is an established extension buildering business in WD17. We come highly recommended and provide competitive quotes for your work.
From £2,512
Relax... you have found a reliable extension builder in WD17. Frame Brickwork is a friendly and reliable company based in WD17 who consider no job ...
From £4,960
Trusted and professional extension builder in WD17. Experienced in all extension buildering work and keeping within budget and on quote. Design & B...
From £2,480
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in WD17 it ranges from £2,112 (Progressive Design London based in WD24) to £4,960 (Design & Build Builders Ltd based in WD18).
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 WD17 by posting a job with HaMuch and we will send it to extension builders in WD17.
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 - £17,936

Two storey extension - £88,654

Build a timber frame extension - £26,436

Build a swimming pool - £81,436

Single storey extension - £63,720

Side return extension - £46,405

Install an RSJ - £2,636

Outbuilding - £10,436

Build a Mansard loft conversion - £52,436

Loft conversion - £37,838

Build a kitchen extension - £42,436

Hip to gable loft conversion - £42,436

Granny annexe - £87,436

Garden office - £10,436

Convert a Garage - £16,436

Garage - £18,936

Build a flat roof extension - £22,436

Build a dormer loft conversion - £42,436

Concrete foundations - £6,686

Convert a bungalow loft - £29,436

Convert a basement - £42,405