From £10,008
Whites Carpentry & Building prides in delivering an excellent extension buildering service and value for money in PO12 and the surrounding areas. ...
From £11,096
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.
From £10,144
We are a small family run business with over 20 years experience in brickwork, bathroom/kitchen fitting, roofing, landscaping, fencing, tiling and ...
From £9,752
Park Building Services Ltd is a trusted extension builder serving customers in PO12 and the surrounding area. Contact us to today to get a competit...
From £10,128
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £10,056
K A Griffin General Builder is an established extension buildering business in PO12. We come highly recommended and provide competitive quotes for ...
From £10,224
Paul Stevens is a trusted extension builder serving customers in PO12 and the surrounding area. Contact us to today to get a competitive quote for ...
From £9,776
Been in the building trade for over 30years .have in that time worked all over the country on many different projects.
Have city &...
From £9,768
TP Developments are here to help customers who need an Extension Builder in PO12. We offer a competitive rate to complete all your extension builde...
From £10,144
Bailey Construction Services are here to help customers who need an Extension Builder in PO12. We offer a competitive rate to complete all your ext...

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 PO12 by posting a job with HaMuch. We'll send it to extension builders in PO12.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Garden Office near Gosport | £35 | £246 |
| Garden Office near Lee-on-the-Solent | £35 | £249 |
| Garden Office near Portsmouth | £36 | £250 |
| Garden Office near Fareham | £35 | £250 |
| Garden Office near Ryde | £34 | £255 |
| Garden Office near Havant & Waterloo | £35 | £248 |
| Garden Office near Waterlooville | £36 | £250 |
| Garden Office near Havant | £35 | £249 |
| Garden Office near Locks Heath | £33 | £240 |
| Garden Office near Horndean | £35 | £253 |
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