From £2,160
Greater London, N8
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,320
We have worked with homeowners all over London and designers to produce work we think you'll love. Our past projects include both new construction ...
From £2,600
Experienced extension builder ready to quote for your work. SSS Brothers Limited is the best extension builder in N8. No obligation free quotes and...
From £2,544
Need an Extension Builder in N8? BM Lofts Limited has been helping local clients (5 mile radius) with their extension buildering jobs for many year...
From £2,456
Michael Collins Builders are experts in domestic conversions and extensions - drawing on over 25 years experience in the trade. We have built up a ...
From £2,120
Need to find an Extension Builder near you for all your extension buildering work?
OAKWOOD CONSTRUCTION UK LTD provides a local, trusted ex...
From £2,240
London Metropolitan Construction Ltd is and property refurbishment and renovation company based and operating throughout London undertaking new bui...
From £2,224
Whether it's garden design, a garden studio or home renovations - we can do it. What you show me, what you imagine, we can build. Contact us now fo...
From £2,568
Relax... you have found a reliable extension builder in N8. CM Build is a friendly and reliable company based in N8 who consider no job as too big ...
From £2,536
We make the adage ‘House is where the heart is’, a reality for the house-owners.We are an empathetic housebuilder that delivers elegance and du...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in N8 it ranges from £2,120 (OAKWOOD CONSTRUCTION UK LTD based in N22) to £2,600 (SSS Brothers Limited based in N15).
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 N8 by posting a job with HaMuch and we will send it to extension builders in N8.
"RSJ re-installation" - N16
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 - £17,677

Two storey extension - £88,265

Build a timber frame extension - £26,177

Build a swimming pool - £81,177

Single storey extension - £58,536

Side return extension - £43,489

Install an RSJ - £2,377

Outbuilding - £10,177

Build a Mansard loft conversion - £52,177

Loft conversion - £35,408

Build a kitchen extension - £42,177

Hip to gable loft conversion - £42,177

Granny annexe - £87,177

Garden office - £10,177

Convert a Garage - £16,177

Garage - £18,677

Build a flat roof extension - £22,177

Build a dormer loft conversion - £42,177

Concrete foundations - £6,427

Convert a bungalow loft - £29,177

Convert a basement - £39,489