From £87,112
Need to find an Extension Builder near you for all your extension buildering work?
J Pearson Building provides a local, trusted extension b...
From £86,752
Fitted Solutions was established in 2006 by founder Sam Fisher; with a promise to deliver exceptional craftmanship combined with first class custom...
From £86,904
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £86,864
Nestled in the rolling hillside of the West Midlands, Derby is a city birthed by the Roman Empire, and grown in the industrial revolution. Initiall...
From £86,744
The Blackbrook Group offers a one-stop shop for your construction project. We offer support from concept through to completion. We start with an in...

Building a granny annexe ranges from £86,744 (The Blackbrook Group based in DE22) to £87,112 (J Pearson Building based in DE24), 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 DE21 by posting a job with HaMuch. We will send it to extension builders in DE21 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Derby | £29 | £227 |
| Granny Annexe near Erewash | £31 | £234 |
| Granny Annexe near Ilkeston | £31 | £236 |
| Granny Annexe near Amber Valley | £32 | £244 |
| Granny Annexe near Belper | £32 | £244 |
| Granny Annexe near Heanor | £31 | £236 |
| Granny Annexe near Long Eaton | £32 | £249 |
| Granny Annexe near Ripley | £32 | £246 |
| Granny Annexe near Broxtowe | £34 | £240 |
| Granny Annexe near Nottingham | £34 | £241 |
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 - £17,375

Two storey extension - £87,813

Build a timber frame extension - £25,875

Build a swimming pool - £80,875

Single storey extension - £52,504

Side return extension - £40,096

Install an RSJ - £2,075

Outbuilding - £9,875

Build a Mansard loft conversion - £51,875

Loft conversion - £32,580

Build a kitchen extension - £41,875

Hip to gable loft conversion - £41,875

Granny annexe - £86,875

Garden office - £9,875

Convert a Garage - £15,875

Garage - £18,375

Build a flat roof extension - £21,875

Build a dormer loft conversion - £41,875

Concrete foundations - £6,125

Convert a bungalow loft - £28,875

Convert a basement - £36,096