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Select your affordable PO10 extension builder
Chris Bond
We are a Small Family run business with over 30 years experience in the building trade, Carpentry is my main trade, with NVQ Level 2.
Rob Butler
Need to find an Extension Builder near you for all your extension buildering work?
Oakstone Developments provides a local, trusted extensio...
Park Building Services Ltd is a trusted extension builder serving customers in PO10 and the surrounding area. Contact us to today to get a competit...
Experienced extension builder ready to quote for your work. HOLLYBANK BUILDING is the best extension builder in PO10. No obligation free quotes and...
A T Holmes & Son Chimney Sweep is a trusted extension builder serving customers in PO10 and the surrounding area. Contact us to today to get a comp...
Hyden's approach is simple, use a structured repeatable approach to building delivery, using the best tradesmen in the business. The outcome is a b...
From £3,704
Scott Jones
Need to find an Extension Builder near you for all your extension buildering work?
KC Fencing Ltd provides a local, trusted extension buil...
From £2,168
Brad Willis
Solent Home Improvements are here to help customers who need an Extension Builder in PO10. We offer a competitive rate to complete all your extensi...
From £2,312
Brad Willis
Solent Home Improvements are here to help customers who need an Extension Builder in PO10. We offer a competitive rate to complete all your extensi...
From £2,096
With over 40 years of experience ARC Property Maintenance & Home Improvements Ltd has been providing a full range of structural repairs and buildin...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in PO10 it ranges from £1,952 (Park Building Services Ltd based in PO9) to £3,704 (KC Fencing Ltd based in po9).
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 PO10 by posting a job with HaMuch and we will send it to extension builders in PO10.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Havant & Waterloo | £35 | £248 |
| Install An RSJ near Havant | £35 | £249 |
| Install An RSJ near Waterlooville | £36 | £250 |
| Install An RSJ near Horndean | £36 | £254 |
| Install An RSJ near Chichester | £34 | £242 |
| Install An RSJ near Portsmouth | £36 | £250 |
| Install An RSJ near Gosport | £35 | £246 |
| Install An RSJ near Fareham | £35 | £250 |
| Install An RSJ near Bognor Regis | £35 | £247 |
| Install An RSJ near Lee-on-the-Solent | £35 | £249 |
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 - £17,779

Two storey extension - £88,419

Build a timber frame extension - £26,279

Build a swimming pool - £81,279

Single storey extension - £60,584

Side return extension - £44,641

Install an RSJ - £2,479

Outbuilding - £10,279

Build a Mansard loft conversion - £52,279

Loft conversion - £36,368

Build a kitchen extension - £42,279

Hip to gable loft conversion - £42,279

Granny annexe - £87,279

Garden office - £10,279

Convert a Garage - £16,279

Garage - £18,779

Build a flat roof extension - £22,279

Build a dormer loft conversion - £42,279

Concrete foundations - £6,529

Convert a bungalow loft - £29,279

Convert a basement - £40,641