From £87,568
We strive for quality for our clients. With over 37 years experience in the building industry we can offer a full service for our clients including...
From £87,272
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,432
Experienced extension builder ready to quote for your work. SWANEY CONSTRUCTION LTD is the best extension builder in MK45. No obligation free quote...
From £87,552
Blue Conker are dedicated to creating spaces for you to enjoy living. From the planning stages through to the finishing touches, our team of profes...

Building a granny annexe ranges from £87,272 (Prive Consultancy Ltd based in MK45) to £87,568 (O & E Developments Ld based in MK45), 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 MK45 by posting a job with HaMuch. We will send it to extension builders in MK45 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Ampthill | £38 | £258 |
| Granny Annexe near Mid Bedfordshire | £42 | £276 |
| Granny Annexe near Kempston | £44 | £273 |
| Granny Annexe near South Bedfordshire | £45 | £278 |
| Granny Annexe near Bedford | £45 | £278 |
| Granny Annexe near Biggleswade | £41 | £268 |
| Granny Annexe near Luton | £42 | £279 |
| Granny Annexe near Dunstable | £41 | £274 |
| Granny Annexe near Letchworth | £44 | £283 |
| Granny Annexe near Bletchley | £39 | £265 |
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 - £17,956

Two storey extension - £88,684

Build a timber frame extension - £26,456

Build a swimming pool - £81,456

Single storey extension - £64,120

Side return extension - £46,630

Install an RSJ - £2,656

Outbuilding - £10,456

Build a Mansard loft conversion - £52,456

Loft conversion - £38,025

Build a kitchen extension - £42,456

Hip to gable loft conversion - £42,456

Granny annexe - £87,456

Garden office - £10,456

Convert a Garage - £16,456

Garage - £18,956

Build a flat roof extension - £22,456

Build a dormer loft conversion - £42,456

Concrete foundations - £6,706

Convert a bungalow loft - £29,456

Convert a basement - £42,630