From £2,072
Need to find an Extension Builder near you for all your extension buildering work?
AMJAC CONSTRUCTION LTD provides a local, trusted extensi...
From £2,192
Eltham Greenwich, SE9
Neris Building Solutions specialising in building of loft conversions, home extensions and home refurbishments.
From £2,504
Experienced extension builder ready to quote for your work. Altash Building Services is the best extension builder in Eltham. No obligation free qu...
From £2,336
Eltham London, SE9
Need to find an Extension Builder near you for all your extension buildering work?
Hartigans Construction provides a local, trusted extensi...
From £2,424
TA LEE BUILDING SERVICES is an established extension buildering business in Eltham. We come highly recommended and provide competitive quotes for y...
From £2,384
Eltham London, SE9
Need an Extension Builder in Eltham? Loft Living has been helping local clients (5 mile radius) with their extension buildering jobs for many years...
From £2,440
Denkar Ltd is an established and experienced local extension builder in Eltham. Please contact us for a free, no obligation quote and competitive r...
From £2,128
Eltham, SE9
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,168
MAGNET CONSTRUCTION LIMITED are here to help customers who need an Extension Builder in Eltham. We offer a competitive rate to complete all your ex...
From £304
Eltham London, SE9
We are TDR Property Maintenance, a business that takes great pride in our work.
(Price Work Only)
Services We Cover:
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How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Eltham it ranges from £304 (TDR Property Maintenance based in SE9) to £2,504 (Altash Building Services based in SE9).
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 Eltham by posting a job with HaMuch and we will send it to extension builders in Eltham.
"RSJ installation - check if we need one installed" - ELTHAM, job posted 01/06/25
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 - £17,395

Two storey extension - £87,843

Build a timber frame extension - £25,895

Build a swimming pool - £80,895

Single storey extension - £52,904

Side return extension - £40,321

Install an RSJ - £2,095

Outbuilding - £9,895

Build a Mansard loft conversion - £51,895

Loft conversion - £32,768

Build a kitchen extension - £41,895

Hip to gable loft conversion - £41,895

Granny annexe - £86,895

Garden office - £9,895

Convert a Garage - £15,895

Garage - £18,395

Build a flat roof extension - £21,895

Build a dormer loft conversion - £41,895

Concrete foundations - £6,145

Convert a bungalow loft - £28,895

Convert a basement - £36,321