From £10,240
JAS Housing Developments is an established and experienced local extension builder in AL1. Please contact us for a free, no obligation quote and co...
From £10,280
Need to find an Extension Builder near you for all your extension buildering work?
JGS Building Ltd provides a local, trusted extension bui...
From £10,240
Beswick Building and Renovations LTD is a trusted extension builder serving customers in AL1 and the surrounding area. Contact us to today to get a...
From £10,136
Relax... you have found a reliable extension builder in AL1. Property Interior Services is a friendly and reliable company based in AL1 who conside...
From £10,320
Relax... you have found a reliable extension builder in AL1. Designer Shade Solutions is a friendly and reliable company based in AL1 who consider ...
From £10,440
IC Builders have been helping customers in St Albans and the surrounding area by providing professional, trustworthy building services.We k...
From £10,080
Trusted and professional extension builder in AL1. Experienced in all extension buildering work and keeping within budget and on quote. P & A Doher...
From £10,144
Relax... you have found a reliable extension builder in AL1. DK Home Refurbishment Limited is a friendly and reliable company based in AL1 who cons...
From £10,216
Ebro Construction Group are here to help customers who need an Extension Builder in AL1. We offer a competitive rate to complete all your extension...

Outbuilding costs in AL1 range from the cheapest of £10,024 (Planson’s Building Services based in AL1) to the dearest of £10,440 (IC Builders based in AL1), but these are just estimates.
Comparing extension builders estimates for building an outbuilding gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get rates and quotes to build an outbuilding in AL1 by posting a job with HaMuch and we will send it to extension builders.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Outbuilding near St Albans | £63 | £288 |
| Outbuilding near Hatfield | £64 | £283 |
| Outbuilding near Harpenden | £86 | £315 |
| Outbuilding near Borehamwood | £42 | £270 |
| Outbuilding near Welwyn Garden City | £42 | £268 |
| Outbuilding near Hemel Hempstead | £42 | £270 |
| Outbuilding near Potters Bar | £43 | £273 |
| Outbuilding near Bushey | £42 | £276 |
| Outbuilding near Dacorum | £42 | £269 |
| Outbuilding 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