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Need an Extension Builder in TW6? ZNS Construction has been helping local clients (10 mile radius) with their extension buildering jobs for many ye...
We offer a wide range of building services to meet every type of projects.- Bathroom renovation- Kitchen refurbishment- Home extensions / conservat...
From £1,928
Emanuel Vodnar
At VEM Insulation Limited, we specialize in providing top-tier construction services including Exterior and interior Insulation, Plumbing and Drain...
From £2,200
Our building services company Rhino Builders Ltd was established in 2019. With over 16 years’ experience in the building trade, we help customers...
From £2,528
My Garden Room is an established extension buildering business in TW6. We come highly recommended and provide competitive quotes for your work.
...From £2,512
My Garden Room - exceptional garden buildings. Designed, delivered and installed all over the UK. Visit our London showroom!
From £2,464
The Market Design & Build is an established extension buildering business in TW6. We come highly recommended and provide competitive quotes for you...
From £2,448
Relax... you have found a reliable extension builder in TW6. Bizy Construction Ltd is a friendly and reliable company based in TW6 who consider no ...
From £2,480
Need an Extension Builder in TW6? Ryan and Collins Ltd. has been helping local clients (10 mile radius) with their extension buildering jobs for ma...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in TW6 it ranges from £1,928 (VEM INSULATION LIMITED based in tw19) to £2,632 (ZNS Construction based in TW14).
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 TW6 by posting a job with HaMuch and we will send it to extension builders in TW6.
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 - £17,678

Two storey extension - £88,268

Build a timber frame extension - £26,178

Build a swimming pool - £81,178

Single storey extension - £58,568

Side return extension - £43,507

Install an RSJ - £2,378

Outbuilding - £10,178

Build a Mansard loft conversion - £52,178

Loft conversion - £35,423

Build a kitchen extension - £42,178

Hip to gable loft conversion - £42,178

Granny annexe - £87,178

Garden office - £10,178

Convert a Garage - £16,178

Garage - £18,678

Build a flat roof extension - £22,178

Build a dormer loft conversion - £42,178

Concrete foundations - £6,428

Convert a bungalow loft - £29,178

Convert a basement - £39,507