From £87,248
RS Plumbing and Heating is a trusted extension builder serving customers in MK42 and the surrounding area. Contact us to today to get a competitive...
From £87,200
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of work in MK42 an...
From £88,024
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of work in MK42 an...
From £87,808
Need to find an Extension Builder near you for all your work?
A M Interiors provides a local, trusted service in and around MK42. Homeown...
From £87,200
Relax... you have found a reliable extension builder in MK42. R G BUILDERS UK LTD is a friendly and reliable company based in MK42 who consider no ...
From £87,328
Need an Extension Builder in MK42? Custom Construction (UK) Ltd has been helping local clients (20 mile radius) with their jobs for many years. Ge...
From £87,448
Relax... you have found a reliable extension builder in MK42. Bench Mark Construction is a friendly and reliable company based in MK42 who consider...
From £87,304
Our building services company MH Building have a combined thirty-five years of experience and have been helping customers in Bedfordshire and the s...
From £86,880
Experienced extension builder ready to quote for your work. Cousins Builders Ltd is the best extension builder in MK42. No obligation free quotes a...
From £86,624
Trusted and professional extension builder in MK42. Experienced in all work and keeping within budget and on quote. K FREEMAN BUILDERS LIMITED hav...

Building a granny annexe ranges from £86,624 (K FREEMAN BUILDERS LIMITED based in MK43) to £88,024 (J K L Building Contractors Ltd based in MK42), 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 MK42 by posting a job with HaMuch. We will send it to extension builders in MK42 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Kempston | £37 | £230 |
| Granny Annexe near Bedford | £38 | £233 |
| Granny Annexe near South Bedfordshire | £38 | £233 |
| Granny Annexe near Ampthill | £31 | £214 |
| Granny Annexe near Mid Bedfordshire | £34 | £225 |
| Granny Annexe near Biggleswade | £35 | £230 |
| Granny Annexe near St Neots | £42 | £256 |
| Granny Annexe near Rushden | £30 | £209 |
| Granny Annexe near Milton Keynes | £33 | £226 |
| Granny Annexe near Bletchley | £34 | £227 |
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 - £17,806

Two storey extension - £88,460

Build a timber frame extension - £26,306

Build a swimming pool - £81,306

Single storey extension - £61,128

Side return extension - £44,947

Install an RSJ - £2,506

Outbuilding - £10,306

Build a Mansard loft conversion - £52,306

Loft conversion - £36,623

Build a kitchen extension - £42,306

Hip to gable loft conversion - £42,306

Granny annexe - £87,306

Garden office - £10,306

Convert a Garage - £16,306

Garage - £18,806

Build a flat roof extension - £22,306

Build a dormer loft conversion - £42,306

Concrete foundations - £6,556

Convert a bungalow loft - £29,306

Convert a basement - £40,947