From £87,072
We are Cognitive Construction, a forward-thinking design & build company.Our houses are our castles and we take great pride in transforming homes a...
From £87,016
Relax... you have found a reliable extension builder in MK18. D Beagle Building Contractors is a friendly and reliable company based in MK18 who co...
From £87,184
ROGERS BUILDERS (AYLESBURY)LTD are here to help customers who need an Extension Builder in MK18. We offer a competitive rate to complete all your e...
From £87,496
Our building services company JAB Home Improvements helps customers in Milton Keynes and the surrounding area by providing professional, trustworth...
From £87,392
Need an Extension Builder in MK18? STARGRADE CONSTRUCTION LTD has been helping local clients (20 mile radius) with their extension buildering jobs ...
From £87,248
Hyatt and Co Building Services was established over 20 years ago and have been providing customers in Milton Keynes and the surrounding areas a pro...
From £87,080
Richmond Services is an established and experienced local extension builder in MK18. Please contact us for a free, no obligation quote and competit...
From £87,168
Aspis Construction Ltd has been helping customers in Northamptonshire and the surrounding area for a number of years by providing professional, tru...
From £87,016
Need an Extension Builder in MK18? D Catt Builders has been helping local clients (20 mile radius) with their extension buildering jobs for many ye...

Building a granny annexe ranges from £86,856 (R&R CONSTRUCTION based in MK12) to £87,496 (JAB based in MK4), 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 MK18 by posting a job with HaMuch. We will send it to extension builders in MK18 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Aylesbury Vale | £36 | £246 |
| Granny Annexe near Bicester | £35 | £249 |
| Granny Annexe near Milton Keynes | £39 | £263 |
| Granny Annexe near Bletchley | £39 | £265 |
| Granny Annexe near Cherwell | £35 | £249 |
| Granny Annexe near Aylesbury | £42 | £270 |
| Granny Annexe near Leighton Buzzard | £38 | £270 |
| Granny Annexe near Banbury | £33 | £239 |
| Granny Annexe near Northampton | £35 | £239 |
| Granny Annexe near Dunstable | £41 | £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 - £17,653

Two storey extension - £88,229

Build a timber frame extension - £26,153

Build a swimming pool - £81,153

Single storey extension - £58,056

Side return extension - £43,219

Install an RSJ - £2,353

Outbuilding - £10,153

Build a Mansard loft conversion - £52,153

Loft conversion - £35,183

Build a kitchen extension - £42,153

Hip to gable loft conversion - £42,153

Granny annexe - £87,153

Garden office - £10,153

Convert a Garage - £16,153

Garage - £18,653

Build a flat roof extension - £22,153

Build a dormer loft conversion - £42,153

Concrete foundations - £6,403

Convert a bungalow loft - £29,153

Convert a basement - £39,219