From £87,200
The business can carry out all aspects of building work:- single or double storey extensions- kitchen and bathroom installations- p...
From £87,192
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £86,984
Lambert Home Builds is a trusted extension builder serving customers in Cowley and the surrounding area. Contact us to today to get a competitive q...
From £87,216
Experienced extension builder ready to quote for your work. DRC Construction is the best extension builder in Cowley. No obligation free quotes and...
From £87,216
Need to find an Extension Builder near you for all your extension buildering work?
BA Knott Oxford Ltd provides a local, trusted extension ...
From £87,128
Relax... you have found a reliable extension builder in Cowley. CHF CONSTRUCTION is a friendly and reliable company based in Cowley who consider no...
From £87,192
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,240
Approved extension builder in Cowley, covering 20 miles.
Whatever extension buildering work you need, including emergency repairs, hire a co...
From £87,512
Michael E Phillips is an established extension buildering business in Cowley. We come highly recommended and provide competitive quotes for your wo...
From £87,016
Relax... you have found a reliable extension builder in Cowley. D Beagle Building Contractors is a friendly and reliable company based in Cowley wh...

Building a granny annexe ranges from £86,984 (Lambert Home Builds based in OX2) to £87,512 (Michael E Phillips based in OX2), 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 Cowley by posting a job with HaMuch. We will send it to extension builders in Cowley who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Oxford | £37 | £261 |
| Granny Annexe near Abingdon-on-Thames | £35 | £258 |
| Granny Annexe near South Oxfordshire | £36 | £253 |
| Granny Annexe near Didcot | £36 | £266 |
| Granny Annexe near Cherwell | £35 | £249 |
| Granny Annexe near Bicester | £35 | £249 |
| Granny Annexe near Witney | £32 | £244 |
| Granny Annexe near Vale of White Horse | £36 | £271 |
| Granny Annexe near Aylesbury Vale | £36 | £246 |
| Granny Annexe near Aylesbury | £42 | £270 |
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 - £17,690

Two storey extension - £88,284

Build a timber frame extension - £26,190

Build a swimming pool - £81,190

Single storey extension - £58,792

Side return extension - £43,633

Install an RSJ - £2,390

Outbuilding - £10,190

Build a Mansard loft conversion - £52,190

Loft conversion - £35,528

Build a kitchen extension - £42,190

Hip to gable loft conversion - £42,190

Granny annexe - £87,190

Garden office - £10,190

Convert a Garage - £16,190

Garage - £18,690

Build a flat roof extension - £22,190

Build a dormer loft conversion - £42,190

Concrete foundations - £6,440

Convert a bungalow loft - £29,190

Convert a basement - £39,633