From £87,000
Our building services company Added Space Ltd have over fifty years combined experience. We have been helping customers in Harlow and the surroundi...
From £90,152
We are small building company working for the residential and domestic properties? We work on all types of buildings creating Loft conversion and H...
From £86,840
Urban lofts and extensions ltd is an established extension buildering business in CM20. We come highly recommended and provide competitive quotes f...
From £87,168
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,168
Welstrong Construction is a team of friends and brothers who enjoy working in the building industry and aim to make sure every customer is fully sa...
From £87,056
With over 20 years of experience we specialise in fit-outs and maximising your living space. Lofts, extensions, basements, new builds and domestic ...
From £86,912
J G BUILDING SERVICES is a trusted extension builder serving customers in CM20 and the surrounding area. Contact us to today to get a competitive q...
From £87,080
VIBE CONSTRUCTION LIMITED is an established extension buildering business in CM20. We come highly recommended and provide competitive quotes for yo...
From £87,352
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,024
Need an Extension Builder in CM20? Loft in Space London has been helping local clients (20 mile radius) with their extension buildering jobs for ma...

Building a granny annexe ranges from £86,840 (Urban lofts and extensions ltd based in cm20) to £90,152 (Essex loft extensions Ltd based in CM20), 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 CM20 by posting a job with HaMuch. We will send it to extension builders in CM20 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Harlow | £43 | £288 |
| Granny Annexe near Hoddesdon | £46 | £296 |
| Granny Annexe near Ware | £47 | £296 |
| Granny Annexe near Bishop's Stortford | £42 | £264 |
| Granny Annexe near Cheshunt | £48 | £285 |
| Granny Annexe near Epping Forest | £44 | £273 |
| Granny Annexe near Hertford | £46 | £289 |
| Granny Annexe near Loughton | £44 | £273 |
| Granny Annexe near East Hertfordshire | £44 | £289 |
| Granny Annexe near Welwyn Garden City | £42 | £268 |
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 - £17,875

Two storey extension - £88,563

Build a timber frame extension - £26,375

Build a swimming pool - £81,375

Single storey extension - £62,504

Side return extension - £45,721

Install an RSJ - £2,575

Outbuilding - £10,375

Build a Mansard loft conversion - £52,375

Loft conversion - £37,268

Build a kitchen extension - £42,375

Hip to gable loft conversion - £42,375

Granny annexe - £87,375

Garden office - £10,375

Convert a Garage - £16,375

Garage - £18,875

Build a flat roof extension - £22,375

Build a dormer loft conversion - £42,375

Concrete foundations - £6,625

Convert a bungalow loft - £29,375

Convert a basement - £41,721