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John Addis
Our building services company JAB Home Improvements helps customers in Milton Keynes and the surrounding area by providing professional, trustworth...
Buckingham, MK18
Relax... you have found a reliable extension builder in Buckingham. D Beagle Building Contractors is a friendly and reliable company based in Bucki...
We are Cognitive Construction, a forward-thinking design & build company.Our houses are our castles and we take great pride in transforming homes a...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Buckingham it ranges from £2,216 (D Beagle Building Contractors based in MK18) to £2,696 (JAB based in MK4).
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 Buckingham by posting a job with HaMuch and we will send it to extension builders in Buckingham.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Aylesbury Vale | £36 | £246 |
| Install An RSJ near Bicester | £35 | £249 |
| Install An RSJ near Milton Keynes | £39 | £263 |
| Install An RSJ near Bletchley | £39 | £265 |
| Install An RSJ near Cherwell | £35 | £249 |
| Install An RSJ near Aylesbury | £42 | £270 |
| Install An RSJ near Leighton Buzzard | £38 | £270 |
| Install An RSJ near Banbury | £33 | £239 |
| Install An RSJ near Northampton | £35 | £239 |
| Install An RSJ near Dunstable | £41 | £274 |
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 - £17,695

Two storey extension - £88,292

Build a timber frame extension - £26,195

Build a swimming pool - £81,195

Single storey extension - £58,893

Side return extension - £43,690

Install an RSJ - £2,395

Outbuilding - £10,195

Build a Mansard loft conversion - £52,195

Loft conversion - £35,575

Build a kitchen extension - £42,195

Hip to gable loft conversion - £42,195

Granny annexe - £87,195

Garden office - £10,195

Convert a Garage - £16,195

Garage - £18,695

Build a flat roof extension - £22,195

Build a dormer loft conversion - £42,195

Concrete foundations - £6,445

Convert a bungalow loft - £29,195

Convert a basement - £39,690