From £87,448
Relax... you have found a reliable extension builder in Kingsthorpe. Bench Mark Construction is a friendly and reliable company based in Kingsthorp...
From £87,808
Need to find an Extension Builder near you for all your extension buildering work?
A M Interiors provides a local, trusted extension builde...
From £86,544
Need to find an Extension Builder near you for all your extension buildering work?
A G Hicks Building Services provides a local, trusted ex...
From £86,952
Relax... you have found a reliable extension builder in Kingsthorpe. Dean Prichard Building Services is a friendly and reliable company based in Ki...
From £87,224
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,040
Trusted and professional extension builder in Kingsthorpe. Experienced in all extension buildering work and keeping within budget and on quote. Lan...
From £87,496
Our building services company JAB Home Improvements helps customers in Milton Keynes and the surrounding area by providing professional, trustworth...
From £86,848
Need an Extension Builder in Kingsthorpe? Highland Homes & Gardens has been helping local clients (20 mile radius) with their extension buildering ...
From £87,272
Need to find an Extension Builder near you for all your extension buildering work?
Asanta Builder provides a local, trusted extension build...
From £87,088
Need to find an Extension Builder near you for all your extension buildering work?
Go-Large Design & Build Ltd provides a local, trusted ex...

Building a granny annexe ranges from £86,544 (A G Hicks Building Services based in NN3) to £87,808 (A M Interiors based in MK42), 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 Kingsthorpe by posting a job with HaMuch. We will send it to extension builders in Kingsthorpe 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 Daventry | £31 | £230 |
| Granny Annexe near Kettering | £34 | £237 |
| Granny Annexe near Rushden | £34 | £231 |
| Granny Annexe near Market Harborough | £31 | £217 |
| Granny Annexe near Milton Keynes | £39 | £263 |
| Granny Annexe near Rugby | £31 | £224 |
| Granny Annexe near Corby | £30 | £214 |
| Granny Annexe near Bedford | £45 | £278 |
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 - £17,672

Two storey extension - £88,258

Build a timber frame extension - £26,172

Build a swimming pool - £81,172

Single storey extension - £58,440

Side return extension - £43,435

Install an RSJ - £2,372

Outbuilding - £10,172

Build a Mansard loft conversion - £52,172

Loft conversion - £35,363

Build a kitchen extension - £42,172

Hip to gable loft conversion - £42,172

Granny annexe - £87,172

Garden office - £10,172

Convert a Garage - £16,172

Garage - £18,672

Build a flat roof extension - £22,172

Build a dormer loft conversion - £42,172

Concrete foundations - £6,422

Convert a bungalow loft - £29,172

Convert a basement - £39,435