From £9,664
Need an Extension Builder in St Helens? KMC Brickwork has been helping local clients (20 mile radius) with their extension buildering jobs for many...
From £9,608
Trusted and professional extension builder in St Helens. Experienced in all extension buildering work and keeping within budget and on quote. M L R...
From £9,872
G. Finnigan Builders is an established extension buildering business in St Helens. We come highly recommended and provide competitive quotes for yo...
From £9,880
Need to find an Extension Builder near you for all your extension buildering work?
Leabra Construction North West Ltd provides a local, tru...
From £9,224
MJ Barker & Son is an established extension buildering business in St Helens. We come highly recommended and provide competitive quotes for your wo...
From £10,032
Hello, I am Allan. I have run Allan Rowe Property Services since September 2014. I am based in Newton Le Willows and provide a wide range of proper...
From £9,896
HIGHTOWN CONSTRUCTION LTD is an established extension buildering business in St Helens. We come highly recommended and provide competitive quotes f...
From £9,800
Higher End Construction Limited is an established extension buildering business in St Helens. We come highly recommended and provide competitive qu...
From £9,864
Need to find an Extension Builder near you for all your extension buildering work?
Maintenance Point provides a local, trusted extension bu...
From £9,824
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 £9,224 (MJ Barker & Son based in WA11) to the dearest of £10,032 (Allan Rowe Property Services based in WA12), 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 St Helens by posting a job with HaMuch. We'll send it to extension builders in St Helens.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Garden Office near St Helens | £31 | £224 |
| Garden Office near Prescot | £31 | £223 |
| Garden Office near Knowsley | £31 | £222 |
| Garden Office near Newton-le-Willows | £31 | £221 |
| Garden Office near Huyton with Roby | £31 | £225 |
| Garden Office near Ashton-in-Makerfield | £30 | £220 |
| Garden Office near Widnes | £31 | £220 |
| Garden Office near Golborne | £30 | £222 |
| Garden Office near Orrell | £29 | £214 |
| Garden Office near Kirkby | £31 | £223 |
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 - £17,266

Two storey extension - £87,650

Build a timber frame extension - £25,766

Build a swimming pool - £80,766

Single storey extension - £50,328

Side return extension - £38,872

Install an RSJ - £1,966

Outbuilding - £9,766

Build a Mansard loft conversion - £51,766

Loft conversion - £31,560

Build a kitchen extension - £41,766

Hip to gable loft conversion - £41,766

Granny annexe - £86,766

Garden office - £9,766

Convert a Garage - £15,766

Garage - £18,266

Build a flat roof extension - £21,766

Build a dormer loft conversion - £41,766

Concrete foundations - £6,016

Convert a bungalow loft - £28,766

Convert a basement - £34,872