From £87,440
IC Builders have been helping customers in St Albans and the surrounding area by providing professional, trustworthy building services.We k...
From £87,320
Relax... you have found a reliable extension builder in St Albans. Designer Shade Solutions is a friendly and reliable company based in St Albans w...
From £87,240
Beswick Building and Renovations LTD is a trusted extension builder serving customers in St Albans and the surrounding area. Contact us to today to...
From £87,240
JAS Housing Developments is an established and experienced local extension builder in St Albans. Please contact us for a free, no obligation quote ...
From £87,280
Need to find an Extension Builder near you for all your extension buildering work?
JGS Building Ltd provides a local, trusted extension bui...
From £87,480
Building services company Renospace was established in 2000. Since then we have been helping customers in Hertfordshire and the surrounding area by...
From £87,080
Trusted and professional extension builder in St Albans. Experienced in all extension buildering work and keeping within budget and on quote. P & A...
From £87,144
Relax... you have found a reliable extension builder in St Albans. DK Home Refurbishment Limited is a friendly and reliable company based in St Alb...
From £87,136
Relax... you have found a reliable extension builder in St Albans. Property Interior Services is a friendly and reliable company based in St Albans...

Building a granny annexe ranges from £87,024 (Planson’s Building Services based in AL1) to £87,480 (RenoSpace based in AL3), 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 St Albans by posting a job with HaMuch. We will send it to extension builders in St Albans who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near St Albans | £63 | £288 |
| Granny Annexe near Harpenden | £86 | £315 |
| Granny Annexe near Hatfield | £64 | £283 |
| Granny Annexe near Hemel Hempstead | £42 | £270 |
| Granny Annexe near Dacorum | £42 | £269 |
| Granny Annexe near Borehamwood | £42 | £270 |
| Granny Annexe near Welwyn Garden City | £42 | £268 |
| Granny Annexe near Bushey | £42 | £276 |
| Granny Annexe near Watford | £43 | £278 |
| Granny Annexe near Potters Bar | £43 | £273 |
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 - £17,738

Two storey extension - £88,358

Build a timber frame extension - £26,238

Build a swimming pool - £81,238

Single storey extension - £59,768

Side return extension - £44,182

Install an RSJ - £2,438

Outbuilding - £10,238

Build a Mansard loft conversion - £52,238

Loft conversion - £35,985

Build a kitchen extension - £42,238

Hip to gable loft conversion - £42,238

Granny annexe - £87,238

Garden office - £10,238

Convert a Garage - £16,238

Garage - £18,738

Build a flat roof extension - £22,238

Build a dormer loft conversion - £42,238

Concrete foundations - £6,488

Convert a bungalow loft - £29,238

Convert a basement - £40,182