J Wijayamohan
JJSR Construction Ltd is an established and experienced local extension builder in Rayners Lane. Please contact us for a free, no obligation quote ...
UK Food
Need to find an Extension Builder near you for all your extension buildering work?
Mamma V's Caribbean and English Cuisine provides a local...
Platinum Electrics is a Branch off Platinum Premier Projects who deal in all types of construction projects. Platinum Electrics are based in London...
C & A Contractors is a trusted extension builder serving customers in Rayners Lane and the surrounding area. Contact us to today to get a competiti...
Relax... you have found a reliable extension builder in Rayners Lane. C T Edwards is a friendly and reliable company based in Rayners Lane who cons...
Volton Building & Paving is a trusted extension builder serving customers in Rayners Lane and the surrounding area. Contact us to today to get a co...
Trusted and professional extension builder in Rayners Lane. Experienced in all extension buildering work and keeping within budget and on quote. A ...
Karsan Dabasia
Trusted and professional extension builder in Rayners Lane. Experienced in all extension buildering work and keeping within budget and on quote. EU...
Stamp Design & Build Ltd is a trusted extension builder serving customers in Rayners Lane and the surrounding area. Contact us to today to get a co...
SS Building Services is a trusted extension builder serving customers in Rayners Lane and the surrounding area. Contact us to today to get a compet...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Rayners Lane it ranges from £2,152 (A D C BUILDERS based in HA1) to £2,632 (Platinum Premier Projects & Premier Electrics based in HA7).
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 Rayners Lane by posting a job with HaMuch and we will send it to extension builders in Rayners Lane.
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 - £17,660

Two storey extension - £88,240

Build a timber frame extension - £26,160

Build a swimming pool - £81,160

Single storey extension - £58,200

Side return extension - £43,300

Install an RSJ - £2,360

Outbuilding - £10,160

Build a Mansard loft conversion - £52,160

Loft conversion - £35,250

Build a kitchen extension - £42,160

Hip to gable loft conversion - £42,160

Granny annexe - £87,160

Garden office - £10,160

Convert a Garage - £16,160

Garage - £18,660

Build a flat roof extension - £22,160

Build a dormer loft conversion - £42,160

Concrete foundations - £6,410

Convert a bungalow loft - £29,160

Convert a basement - £39,300