From £9,760
M B Brickwork is an established extension buildering business in PO6. We come highly recommended and provide competitive quotes for your work.
...From £10,128
Relax... you have found a reliable extension builder in PO6. SLG Mills Building Services is a friendly and reliable company based in PO6 who consid...
From £10,104
As a family owned limited company of over 40 years, our focus on quality and service has seen our business thrive and grow, solely through recommen...
From £9,728
Experienced extension builder ready to quote for your work. A G Builders is the best extension builder in PO6. No obligation free quotes and many h...
From £10,000
Build Light Group is an established and experienced local extension builder in PO6. Please contact us for a free, no obligation quote and competiti...
From £9,984
Sigma Probuild Ltd is an established extension buildering business in PO6. We come highly recommended and provide competitive quotes for your work....
From £9,824
Relax... you have found a reliable extension builder in PO6. Bribern Property Services is a friendly and reliable company based in PO6 who consider...
From £9,784
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £9,800
Need to find an Extension Builder near you for all your extension buildering work?
DC Roofing & Sons Ltd provides a local, trusted extensio...
From £9,712
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Garden offices range from the cheapest of £9,712 (Westcott Construction Ltd based in PO3) to the dearest of £10,128 (SLG Mills Building Services based in PO7), 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 PO6 by posting a job with HaMuch. We'll send it to extension builders in PO6.
"Garden office" - PO9, job posted 01/05/26
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Garden Office near Portsmouth | £36 | £250 |
| Garden Office near Waterlooville | £36 | £250 |
| Garden Office near Havant & Waterloo | £35 | £248 |
| Garden Office near Havant | £35 | £249 |
| Garden Office near Gosport | £35 | £246 |
| Garden Office near Horndean | £35 | £253 |
| Garden Office near Fareham | £35 | £250 |
| Garden Office near Lee-on-the-Solent | £35 | £249 |
| Garden Office near Locks Heath | £33 | £240 |
| Garden Office near Hedge End | £34 | £244 |
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 - £17,382

Two storey extension - £87,824

Build a timber frame extension - £25,882

Build a swimming pool - £80,882

Single storey extension - £52,648

Side return extension - £40,177

Install an RSJ - £2,082

Outbuilding - £9,882

Build a Mansard loft conversion - £51,882

Loft conversion - £32,648

Build a kitchen extension - £41,882

Hip to gable loft conversion - £41,882

Granny annexe - £86,882

Garden office - £9,882

Convert a Garage - £15,882

Garage - £18,382

Build a flat roof extension - £21,882

Build a dormer loft conversion - £41,882

Concrete foundations - £6,132

Convert a bungalow loft - £28,882

Convert a basement - £36,177