From £86,784
Need to find an Extension Builder near you for all your extension buildering work?
DT ANDERSON CONSTRUCTION LTD provides a local, trusted e...

Building a granny annexe ranges from £86,784 (DT ANDERSON CONSTRUCTION LTD based in WA8) to £87,064 (Bakers Building Maintenance based in WA8), 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 WA8 by posting a job with HaMuch. We will send it to extension builders in WA8 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Widnes | £31 | £220 |
| Granny Annexe near Halton | £31 | £220 |
| Granny Annexe near Runcorn | £33 | £228 |
| Granny Annexe near Huyton with Roby | £31 | £225 |
| Granny Annexe near Prescot | £31 | £223 |
| Granny Annexe near Knowsley | £31 | £222 |
| Granny Annexe near St Helens | £31 | £224 |
| Granny Annexe near Warrington | £31 | £222 |
| Granny Annexe near Newton-le-Willows | £31 | £221 |
| Granny Annexe near Golborne | £30 | £222 |
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 - £17,424

Two storey extension - £87,886

Build a timber frame extension - £25,924

Build a swimming pool - £80,924

Single storey extension - £53,480

Side return extension - £40,645

Install an RSJ - £2,124

Outbuilding - £9,924

Build a Mansard loft conversion - £51,924

Loft conversion - £33,038

Build a kitchen extension - £41,924

Hip to gable loft conversion - £41,924

Granny annexe - £86,924

Garden office - £9,924

Convert a Garage - £15,924

Garage - £18,424

Build a flat roof extension - £21,924

Build a dormer loft conversion - £41,924

Concrete foundations - £6,174

Convert a bungalow loft - £28,924

Convert a basement - £36,645