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Steve Bannister
We are a small family run business with over 20 years experience in brickwork, bathroom/kitchen fitting, roofing, landscaping, fencing, tiling and ...
O NEILL CONSTRUCTION LTD is an established extension buildering business in Southsea. We come highly recommended and provide competitive quotes for...
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.
Devscapes is an established extension buildering business in Southsea. We come highly recommended and provide competitive quotes for your work.
...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 Southsea and the surrounding area. Contact us to today to get a comp...
Experienced extension builder ready to quote for your work. Shepperd Developments is the best extension builder in Southsea. No obligation free quo...
Southsea, PO4
Experienced extension builder ready to quote for your work. Portsmouth Building Repairs is the best extension builder in Southsea. No obligation fr...
Peter Fenn Property is a trusted extension builder serving customers in Southsea and the surrounding area. Contact us to today to get a competitive...
Southsea, PO5
JKS Property is an established and experienced local extension builder in Southsea. Please contact us for a free, no obligation quote and competiti...

Garden offices range from the cheapest of £9,752 (Park Building Services Ltd based in PO9) to the dearest of £11,096 (R&B Property Improvements based in PO9), but these are only estimates.
The best way to compare costs is to get actual quotes.
Get rates and quotes to build a garden office in Southsea by posting a job with HaMuch. We'll send it to extension builders in Southsea.
"Garden office" - PO9, job posted 01/05/26
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Garden Office near Portsmouth | £36 | £250 |
| Garden Office near Gosport | £35 | £246 |
| Garden Office near Havant & Waterloo | £35 | £248 |
| Garden Office near Havant | £35 | £249 |
| Garden Office near Ryde | £34 | £255 |
| Garden Office near Lee-on-the-Solent | £35 | £249 |
| Garden Office near Fareham | £35 | £250 |
| Garden Office near Waterlooville | £36 | £250 |
| Garden Office near Horndean | £36 | £254 |
| Garden Office near Locks Heath | £33 | £240 |
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 - £17,610

Two storey extension - £88,164

Build a timber frame extension - £26,110

Build a swimming pool - £81,110

Single storey extension - £57,192

Side return extension - £42,733

Install an RSJ - £2,310

Outbuilding - £10,110

Build a Mansard loft conversion - £52,110

Loft conversion - £34,778

Build a kitchen extension - £42,110

Hip to gable loft conversion - £42,110

Granny annexe - £87,110

Garden office - £10,110

Convert a Garage - £16,110

Garage - £18,610

Build a flat roof extension - £22,110

Build a dormer loft conversion - £42,110

Concrete foundations - £6,360

Convert a bungalow loft - £29,110

Convert a basement - £38,733