From £87,064
Croft-Hill Building & Joinery is a trusted extension builder serving customers in DL15 and the surrounding area. Contact us to today to get a compe...
From £86,968
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,040
Need to find an Extension Builder near you for all your extension buildering work?
SBC (BUILDERS) LIMITED provides a local, trusted extensi...

Building a granny annexe ranges from £86,968 (D. Simpson Roof Rite Services based in DL14) to £87,064 (Croft-Hill Building & Joinery based in DL15), 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 DL15 by posting a job with HaMuch. We will send it to extension builders in DL15 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Bishop Auckland | £38 | £248 |
| Granny Annexe near Spennymoor | £37 | £249 |
| Granny Annexe near Durham | £47 | £267 |
| Granny Annexe near Newton Aycliffe | £38 | £225 |
| Granny Annexe near Consett | £33 | £241 |
| Granny Annexe near Stanley | £34 | £242 |
| Granny Annexe near Chester-le-Street | £35 | £242 |
| Granny Annexe near Darlington | £60 | £222 |
| Granny Annexe near Washington | £33 | £254 |
| Granny Annexe near Sunderland | £33 | £251 |
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 - £17,524

Two storey extension - £88,036

Build a timber frame extension - £26,024

Build a swimming pool - £81,024

Single storey extension - £55,480

Side return extension - £41,770

Install an RSJ - £2,224

Outbuilding - £10,024

Build a Mansard loft conversion - £52,024

Loft conversion - £33,975

Build a kitchen extension - £42,024

Hip to gable loft conversion - £42,024

Granny annexe - £87,024

Garden office - £10,024

Convert a Garage - £16,024

Garage - £18,524

Build a flat roof extension - £22,024

Build a dormer loft conversion - £42,024

Concrete foundations - £6,274

Convert a bungalow loft - £29,024

Convert a basement - £37,770