From £86,664
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 £86,608
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 £86,872
G. Finnigan Builders is an established extension buildering business in St Helens. We come highly recommended and provide competitive quotes for yo...
From £86,880
Need to find an Extension Builder near you for all your extension buildering work?
Leabra Construction North West Ltd provides a local, tru...
From £86,224
MJ Barker & Son is an established extension buildering business in St Helens. We come highly recommended and provide competitive quotes for your wo...
From £87,032
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 £86,896
HIGHTOWN CONSTRUCTION LTD is an established extension buildering business in St Helens. We come highly recommended and provide competitive quotes f...
From £86,800
Higher End Construction Limited is an established extension buildering business in St Helens. We come highly recommended and provide competitive qu...
From £86,864
Need to find an Extension Builder near you for all your extension buildering work?
Maintenance Point provides a local, trusted extension bu...
From £86,824
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Building a granny annexe ranges from £86,224 (MJ Barker & Son based in WA11) to £87,032 (Allan Rowe Property Services based in WA12), but these are just estimates that can help give you an idea of who will be better value in your area.
The best thing to do is to get quotes to build a granny annexe in St Helens by posting a job with HaMuch. We will send it to extension builders in St Helens who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near St Helens | £31 | £224 |
| Granny Annexe near Prescot | £31 | £223 |
| Granny Annexe near Knowsley | £31 | £222 |
| Granny Annexe near Newton-le-Willows | £31 | £221 |
| Granny Annexe near Huyton with Roby | £31 | £225 |
| Granny Annexe near Ashton-in-Makerfield | £30 | £220 |
| Granny Annexe near Widnes | £31 | £220 |
| Granny Annexe near Golborne | £30 | £222 |
| Granny Annexe near Orrell | £29 | £214 |
| Granny Annexe 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