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 PO1. No obligation free quotes a...
Experienced extension builder ready to quote for your work. Portsmouth Building Repairs is the best extension builder in PO1. No obligation free qu...
Peter Fenn Property is a trusted extension builder serving customers in PO1 and the surrounding area. Contact us to today to get a competitive quot...
JKS Property is an established and experienced local extension builder in PO1. Please contact us for a free, no obligation quote and competitive ra...
M.K Warner Building Services is an established extension buildering business in PO1. We come highly recommended and provide competitive quotes for ...
BUILD PROJECT LIMITED are here to help customers who need an Extension Builder in PO1. 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 PO1. No obligation free...
Steve Harris
Hi my name is Steve harris of hb builders we are based in portchester and have over 40 years of experience in the building trade we would be mor...
Jason Wall
Build Light Group is an established and experienced local extension builder in PO1. Please contact us for a free, no obligation quote and competiti...

Garden offices range from the cheapest of £9,736 (H B Builders based in PO16) 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 PO1 by posting a job with HaMuch. We'll send it to extension builders in PO1.
"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 Lee-on-the-Solent | £35 | £249 |
| Garden Office near Fareham | £35 | £250 |
| Garden Office near Ryde | £34 | £255 |
| Garden Office near Havant & Waterloo | £35 | £248 |
| Garden Office near Havant | £35 | £249 |
| 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 - £17,494

Two storey extension - £87,990

Build a timber frame extension - £25,994

Build a swimming pool - £80,994

Single storey extension - £54,872

Side return extension - £41,428

Install an RSJ - £2,194

Outbuilding - £9,994

Build a Mansard loft conversion - £51,994

Loft conversion - £33,690

Build a kitchen extension - £41,994

Hip to gable loft conversion - £41,994

Granny annexe - £86,994

Garden office - £9,994

Convert a Garage - £15,994

Garage - £18,494

Build a flat roof extension - £21,994

Build a dormer loft conversion - £41,994

Concrete foundations - £6,244

Convert a bungalow loft - £28,994

Convert a basement - £37,428