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Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
QA's Pointing Brick Repair
Relax... you have found a reliable extension builder in Lambeth. QA's Pointing and Brick Repair is a friendly and reliable company based in Lambeth...
Torrington Design
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO
Experienced extension builder ready to quote for your work. The Perfectionist is the best extension builder in Lambeth. No obligation free quotes a...
Experienced extension builder ready to quote for your work. D & G Building & Decorating is the best extension builder in Lambeth. No obligation fre...
CK Constructions & Development Ltd is a trusted extension builder serving customers in Lambeth and the surrounding area. Contact us to today to get...
A to Z Builders Ltd are here to help customers who need an Extension Builder in Lambeth. We offer a competitive rate to complete all your extension...
Experienced extension builder ready to quote for your work. Cornerstones Construction is the best extension builder in Lambeth. No obligation free ...
JK Doors is a trusted extension builder serving customers in Lambeth and the surrounding area. Contact us to today to get a competitive quote for e...
JM Building Services is a trusted extension builder serving customers in Lambeth and the surrounding area. Contact us to today to get a competitive...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Lambeth it ranges from £2,176 (A to Z Builders Ltd based in SW1P) to £2,576 (CK Constructions & Development Ltd based in WC1N).
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 Lambeth by posting a job with HaMuch and we will send it to extension builders in Lambeth.
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 - £17,640

Two storey extension - £88,210

Build a timber frame extension - £26,140

Build a swimming pool - £81,140

Single storey extension - £57,800

Side return extension - £43,075

Install an RSJ - £2,340

Outbuilding - £10,140

Build a Mansard loft conversion - £52,140

Loft conversion - £35,063

Build a kitchen extension - £42,140

Hip to gable loft conversion - £42,140

Granny annexe - £87,140

Garden office - £10,140

Convert a Garage - £16,140

Garage - £18,640

Build a flat roof extension - £22,140

Build a dormer loft conversion - £42,140

Concrete foundations - £6,390

Convert a bungalow loft - £29,140

Convert a basement - £39,075