From £2,680
Boston, PE21
Need an Extension Builder in Boston? D H S Dima Home Improvement Services has been helping local clients (20 mile radius) with their extension buil...
From £2,504
P MARSH BUILDING CONTRACTOR is an established and experienced local extension builder in Boston. Please contact us for a free, no obligation quote ...
From £2,032
Our building services company DH Home Improvements was established in 2003. Since then we have been helping customers in Lincolnshire and the surro...
From £2,104
R JOSE (BUILDER) is an established and experienced local extension builder in Boston. Please contact us for a free, no obligation quote and competi...
From £1,720
MOOR FARM BUILDING CO LIMITED is an established extension buildering business in Boston. We come highly recommended and provide competitive quotes ...
From £1,824
Experienced extension builder ready to quote for your work. RANDALL BUILDERS LTD is the best extension builder in Boston. No obligation free quotes...
From £1,728
Trusted and professional extension builder in Boston. Experienced in all extension buildering work and keeping within budget and on quote. PAUL JAC...
From £1,792
Relax... you have found a reliable extension builder in Boston. NEWTEC CONSTRUCTION LTD is a friendly and reliable company based in Boston who cons...
From £1,464
KIPS BUILDERS is a trusted extension builder serving customers in Boston and the surrounding area. Contact us to today to get a competitive quote f...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Boston it ranges from £1,464 (KIPS BUILDERS based in NG34) 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 Boston by posting a job with HaMuch and we will send it to extension builders in Boston.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Boston | £28 | £262 |
| Install An RSJ near Spalding | £32 | £238 |
| Install An RSJ near Wisbech | £34 | £255 |
| Install An RSJ near East Lindsey | £27 | £198 |
| Install An RSJ near King's Lynn | £33 | £254 |
| Install An RSJ near Kings Lynn & West Norfolk | £31 | £238 |
| Install An RSJ near Grantham | £38 | £228 |
| Install An RSJ near Stamford | £35 | £248 |
| Install An RSJ near Peterborough | £42 | £280 |
| Install An RSJ near Lincoln | £31 | £232 |
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 - £17,259

Two storey extension - £87,639

Build a timber frame extension - £25,759

Build a swimming pool - £80,759

Single storey extension - £50,184

Side return extension - £38,791

Install an RSJ - £1,959

Outbuilding - £9,759

Build a Mansard loft conversion - £51,759

Loft conversion - £31,493

Build a kitchen extension - £41,759

Hip to gable loft conversion - £41,759

Granny annexe - £86,759

Garden office - £9,759

Convert a Garage - £15,759

Garage - £18,259

Build a flat roof extension - £21,759

Build a dormer loft conversion - £41,759

Concrete foundations - £6,009

Convert a bungalow loft - £28,759

Convert a basement - £34,791