Steve Bannister
We are a small family run business with over 20 years experience in brickwork, bathroom/kitchen fitting, roofing, landscaping, fencing, tiling and ...
Experienced extension builder ready to quote for your work. Shepperd Developments is the best extension builder in PO4. No obligation free quotes a...
Experienced extension builder ready to quote for your work. Portsmouth Building Repairs is the best extension builder in PO4. No obligation free qu...
Peter Fenn Property is a trusted extension builder serving customers in PO4 and the surrounding area. Contact us to today to get a competitive quot...
JKS Property is an established and experienced local extension builder in PO4. Please contact us for a free, no obligation quote and competitive ra...
M.K Warner Building Services is an established extension buildering business in PO4. We come highly recommended and provide competitive quotes for ...
BUILD PROJECT LIMITED are here to help customers who need an Extension Builder in PO4. We offer a competitive rate to complete all your extension b...
Experienced extension builder ready to quote for your work. JM Roofing & Building Services is the best extension builder in PO4. No obligation free...
Jason Wall
Build Light Group is an established and experienced local extension builder in PO4. Please contact us for a free, no obligation quote and competiti...

Garden offices range from the cheapest of £9,824 (P Pattison based in PO12) to the dearest of £10,176 (JKS Property based in PO5), 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 PO4 by posting a job with HaMuch. We'll send it to extension builders in PO4.
"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 - £17,502

Two storey extension - £88,004

Build a timber frame extension - £26,002

Build a swimming pool - £81,002

Single storey extension - £55,048

Side return extension - £41,527

Install an RSJ - £2,202

Outbuilding - £10,002

Build a Mansard loft conversion - £52,002

Loft conversion - £33,773

Build a kitchen extension - £42,002

Hip to gable loft conversion - £42,002

Granny annexe - £87,002

Garden office - £10,002

Convert a Garage - £16,002

Garage - £18,502

Build a flat roof extension - £22,002

Build a dormer loft conversion - £42,002

Concrete foundations - £6,252

Convert a bungalow loft - £29,002

Convert a basement - £37,527