Need an Extension Builder in PE12? D H S Dima Home Improvement Services has been helping local clients (20 mile radius) with their extension builde...
Trusted and professional extension builder in PE12. Experienced in all extension buildering work and keeping within budget and on quote. RBAM Const...
Trinity Green Building Contractors are here to help customers who need an Extension Builder in PE12. We offer a competitive rate to complete all yo...
Trusted and professional extension builder in PE12. Experienced in all extension buildering work and keeping within budget and on quote. Moores Roo...
Your Local builders in Peterborough
GMF Builders is owned and managed by Graham Fuller who has approximately 23 years experience in the ...
Member since January 2026
Welcome to Price & Sons! We are a building company based in Peterborough. If you are interested in a quote please get in touch with us!
Lauren Builders are a domestic and commercial building company based in Peterborough, and is owned and run by Father & Son, Mick & Lee Gapper, who ...
Relax... you have found a reliable extension builder in PE12. B & K BUILDING SERVICES is a friendly and reliable company based in PE12 who consider...
Trusted and professional extension builder in PE12. Experienced in all extension buildering work and keeping within budget and on quote. ANDREW RUS...
Trusted and professional extension builder in PE12. Experienced in all extension buildering work and keeping within budget and on quote. WEST NORFO...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in PE12 it ranges from £1,728 (B & K BUILDING SERVICES based in PE30) to £2,680 (D H S Dima Home Improvement Services based in PE21).
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 PE12 by posting a job with HaMuch and we will send it to extension builders in PE12.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Spalding | £32 | £238 |
| Install An RSJ near Wisbech | £34 | £255 |
| Install An RSJ near Boston | £28 | £262 |
| Install An RSJ near King's Lynn | £33 | £254 |
| Install An RSJ near Peterborough | £40 | £281 |
| Install An RSJ near Kings Lynn & West Norfolk | £31 | £238 |
| Install An RSJ near Stamford | £35 | £248 |
| Install An RSJ near Huntingdonshire | £36 | £290 |
| Install An RSJ near Grantham | £38 | £228 |
| Install An RSJ near Ely | £40 | £279 |
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 - £17,514

Two storey extension - £88,022

Build a timber frame extension - £26,014

Build a swimming pool - £81,014

Single storey extension - £55,288

Side return extension - £41,662

Install an RSJ - £2,214

Outbuilding - £10,014

Build a Mansard loft conversion - £52,014

Loft conversion - £33,885

Build a kitchen extension - £42,014

Hip to gable loft conversion - £42,014

Granny annexe - £87,014

Garden office - £10,014

Convert a Garage - £16,014

Garage - £18,514

Build a flat roof extension - £22,014

Build a dormer loft conversion - £42,014

Concrete foundations - £6,264

Convert a bungalow loft - £29,014

Convert a basement - £37,662