Alan Hicks
Need to find an Extension Builder near you for all your extension buildering work?
A G Hicks Building Services provides a local, trusted ex...
Need to find an Extension Builder near you for all your extension buildering work?
Picking your Local Builder provides a local, trusted ext...
Trusted and professional extension builder in Spratton. Experienced in all extension buildering work and keeping within budget and on quote. Northa...
Walsh Builders Ltd is an established and experienced local extension builder in Spratton. Please contact us for a free, no obligation quote and com...
M Home Renovations is an established extension buildering business in Spratton. We come highly recommended and provide competitive quotes for your ...
Relax... you have found a reliable extension builder in Spratton. Wright Building is a friendly and reliable company based in Spratton who consider...
Need an Extension Builder in Spratton? DAB & K&G Building Services has been helping local clients (20 mile radius) with their extension buildering ...
Samrai Associates was founded by Hars Samrai in Northampton in order to provide clients with a prompt and robust Architectural Service. Over time m...
Neil Donlevy
Need to find an Extension Builder near you for all your extension buildering work?
The Builders - Northampton Limited provides a local, tru...
Trusted and professional extension builder in Spratton. Experienced in all extension buildering work and keeping within budget and on quote. P F HO...

Building a granny annexe ranges from £86,544 (A G Hicks Building Services based in NN3) to £87,248 (Samrai Associates Limited based in NN3), 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 Spratton by posting a job with HaMuch. We will send it to extension builders in Spratton who will be happy to help you.
"Granny annexe" - NN5, job posted 08/04/26
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Northampton | £35 | £239 |
| Granny Annexe near Wellingborough | £39 | £251 |
| Granny Annexe near Kettering | £34 | £237 |
| Granny Annexe near Daventry | £31 | £230 |
| Granny Annexe near Market Harborough | £31 | £217 |
| Granny Annexe near Rugby | £31 | £224 |
| Granny Annexe near Rushden | £34 | £231 |
| Granny Annexe near Corby | £30 | £214 |
| Granny Annexe near Wigston | £28 | £209 |
| Granny Annexe near Milton Keynes | £39 | £263 |
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 - £17,439

Two storey extension - £87,909

Build a timber frame extension - £25,939

Build a swimming pool - £80,939

Single storey extension - £53,784

Side return extension - £40,816

Install an RSJ - £2,139

Outbuilding - £9,939

Build a Mansard loft conversion - £51,939

Loft conversion - £33,180

Build a kitchen extension - £41,939

Hip to gable loft conversion - £41,939

Granny annexe - £86,939

Garden office - £9,939

Convert a Garage - £15,939

Garage - £18,439

Build a flat roof extension - £21,939

Build a dormer loft conversion - £41,939

Concrete foundations - £6,189

Convert a bungalow loft - £28,939

Convert a basement - £36,816