From £87,008
Ethos Property Developments Limited is an established extension buildering business in BL1. We come highly recommended and provide competitive quot...
From £85,960
Member since November 2019
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £86,656
Hello So we do not work and almost any work and it works very well and qualitatively If you are interested we can work in the future
From £86,792
Need to find an Extension Builder near you for all your extension buildering work?
DC Contractors provides a local, trusted extension build...
From £86,776
Relax... you have found a reliable extension builder in BL1. David Anderson Builders is a friendly and reliable company based in BL1 who consider n...
From £86,960
Need to find an Extension Builder near you for all your extension buildering work?
ESBP Specialists Ltd provides a local, trusted extension...
From £86,848
Trusted and professional extension builder in BL1. Experienced in all extension buildering work and keeping within budget and on quote. We Build ha...
From £86,608
Need an Extension Builder in BL1? MK Builders has been helping local clients (20 mile radius) with their extension buildering jobs for many years. ...
From £86,632
Trusted and professional extension builder in BL1. Experienced in all extension buildering work and keeping within budget and on quote. Fit-on Gara...

Building a granny annexe ranges from £85,960 (Aquatec Builder based in OL10) to £87,008 (Ethos Property Developments Limited based in SK15), 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 BL1 by posting a job with HaMuch. We will send it to extension builders in BL1 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Bolton | £31 | £219 |
| Granny Annexe near Farnworth | £30 | £219 |
| Granny Annexe near Horwich | £30 | £219 |
| Granny Annexe near Westhoughton | £31 | £222 |
| Granny Annexe near Little Hulton | £30 | £220 |
| Granny Annexe near Atherton | £31 | £223 |
| Granny Annexe near Radcliffe | £30 | £220 |
| Granny Annexe near Bury | £30 | £219 |
| Granny Annexe near Hindley | £30 | £219 |
| Granny Annexe near Swinton | £32 | £234 |
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 - £17,142

Two storey extension - £87,464

Build a timber frame extension - £25,642

Build a swimming pool - £80,642

Single storey extension - £47,848

Side return extension - £37,477

Install an RSJ - £1,842

Outbuilding - £9,642

Build a Mansard loft conversion - £51,642

Loft conversion - £30,398

Build a kitchen extension - £41,642

Hip to gable loft conversion - £41,642

Granny annexe - £86,642

Garden office - £9,642

Convert a Garage - £15,642

Garage - £18,142

Build a flat roof extension - £21,642

Build a dormer loft conversion - £41,642

Concrete foundations - £5,892

Convert a bungalow loft - £28,642

Convert a basement - £33,477