From £87,240
Hertfordshire, AL1
JAS Housing Developments is an established and experienced local extension builder in Hertfordshire. Please contact us for a free, no obligation qu...
From £87,280
Hertfordshire, AL1
Need to find an Extension Builder near you for all your extension buildering work?
JGS Building Ltd provides a local, trusted extension bui...
From £87,240
Hertfordshire, AL1
Beswick Building and Renovations LTD is a trusted extension builder serving customers in Hertfordshire and the surrounding area. Contact us to toda...
From £87,136
Relax... you have found a reliable extension builder in Hertfordshire. Property Interior Services is a friendly and reliable company based in Hertf...
From £87,320
Hertfordshire, AL1
Relax... you have found a reliable extension builder in Hertfordshire. Designer Shade Solutions is a friendly and reliable company based in Hertfor...
From £87,440
Hertfordshire, AL1
IC Builders have been helping customers in St Albans and the surrounding area by providing professional, trustworthy building services.We k...
From £87,080
Trusted and professional extension builder in Hertfordshire. Experienced in all extension buildering work and keeping within budget and on quote. P...
From £87,144
Relax... you have found a reliable extension builder in Hertfordshire. DK Home Refurbishment Limited is a friendly and reliable company based in He...
From £87,216
Hertfordshire, AL4
Ebro Construction Group are here to help customers who need an Extension Builder in Hertfordshire. We offer a competitive rate to complete all your...

Building a granny annexe ranges from £87,024 (Planson’s Building Services based in AL1) to £87,440 (IC Builders based in AL1), 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 Hertfordshire by posting a job with HaMuch. We will send it to extension builders in Hertfordshire who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near St Albans | £63 | £288 |
| Granny Annexe near Hatfield | £64 | £283 |
| Granny Annexe near Harpenden | £86 | £315 |
| Granny Annexe near Borehamwood | £42 | £270 |
| Granny Annexe near Welwyn Garden City | £42 | £268 |
| Granny Annexe near Hemel Hempstead | £42 | £270 |
| Granny Annexe near Potters Bar | £43 | £273 |
| Granny Annexe near Bushey | £42 | £276 |
| Granny Annexe near Dacorum | £42 | £269 |
| Granny Annexe near Watford | £43 | £278 |
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 - £17,712

Two storey extension - £88,318

Build a timber frame extension - £26,212

Build a swimming pool - £81,212

Single storey extension - £59,240

Side return extension - £43,885

Install an RSJ - £2,412

Outbuilding - £10,212

Build a Mansard loft conversion - £52,212

Loft conversion - £35,738

Build a kitchen extension - £42,212

Hip to gable loft conversion - £42,212

Granny annexe - £87,212

Garden office - £10,212

Convert a Garage - £16,212

Garage - £18,712

Build a flat roof extension - £22,212

Build a dormer loft conversion - £42,212

Concrete foundations - £6,462

Convert a bungalow loft - £29,212

Convert a basement - £39,885