From £2,592
Need an Extension Builder in Lemsford? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for man...
From £2,248
Trusted and professional extension builder in Lemsford. Experienced in all extension buildering work and keeping within budget and on quote. WHITE ...
From £2,760
Our homes need to be regularly maintained and from time to time they need to be rejuvenated, modernised and enhanced. When it comes to building wor...
From £2,296
Experienced extension builder ready to quote for your work. Mr is the best extension builder in Lemsford. No obligation free quotes and many happy ...
From £2,184
JK Doors is a trusted extension builder serving customers in Lemsford and the surrounding area. Contact us to today to get a competitive quote for ...
From £2,392
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
From £2,512
skilled worker who specializes in completing a wide range of building and renovation projects
From £3,784
Propello is an established and experienced local extension builder in Lemsford. Please contact us for a free, no obligation quote and competitive ...
From £2,448
At Building Services Contractors we pride ourselves on an efficient and friendly service, and strive to achieve 100% customer satisfaction.
From £2,624
Sharp Building Ltd is an established and experienced local extension builder in Lemsford. Please contact us for a free, no obligation quote and com...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Lemsford it ranges from £2,184 (JK Doors based in W1W) to £3,784 (Propello based in E17).
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 Lemsford by posting a job with HaMuch and we will send it to extension builders in Lemsford.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Welwyn Garden City | £42 | £268 |
| Install An RSJ near Hatfield | £64 | £283 |
| Install An RSJ near Hertford | £46 | £289 |
| Install An RSJ near Harpenden | £86 | £315 |
| Install An RSJ near St Albans | £63 | £288 |
| Install An RSJ near Potters Bar | £43 | £273 |
| Install An RSJ near Stevenage | £44 | £282 |
| Install An RSJ near Ware | £47 | £296 |
| Install An RSJ near Hitchin | £43 | £283 |
| Install An RSJ near Cheshunt | £48 | £285 |
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 - £17,884

Two storey extension - £88,576

Build a timber frame extension - £26,384

Build a swimming pool - £81,384

Single storey extension - £62,680

Side return extension - £45,820

Install an RSJ - £2,584

Outbuilding - £10,384

Build a Mansard loft conversion - £52,384

Loft conversion - £37,350

Build a kitchen extension - £42,384

Hip to gable loft conversion - £42,384

Granny annexe - £87,384

Garden office - £10,384

Convert a Garage - £16,384

Garage - £18,884

Build a flat roof extension - £22,384

Build a dormer loft conversion - £42,384

Concrete foundations - £6,634

Convert a bungalow loft - £29,384

Convert a basement - £41,820