From £10,392
Our building services company Country Home Concepts has been helping customers in Hertfordshire and the surrounding area by providing professional,...
From £10,320
Totalworth Building Services is an established extension buildering business in SG4. We come highly recommended and provide competitive quotes for ...
From £10,016
Experienced extension builder ready to quote for your work. G B BUILDSTORE LTD is the best extension builder in SG4. No obligation free quotes and ...
From £10,272
Harris Building Solutions Limited is an established extension buildering business in SG4. We come highly recommended and provide competitive quotes...
From £10,232
We are a local roofing company offering a complete roofing service.We provide one of the most cost effective, reliable roofing services in and ...
From £10,512
Building and Technology Systems LTD is a company with honest core values of providing really fast, outstanding quality and value at competitive pri...
From £10,408
M P BUILDING LIMITED is an established and experienced local extension builder in SG4. Please contact us for a free, no obligation quote and compet...
From £9,704
Need an Extension Builder in SG4? L P L Property Services Limited has been helping local clients (20 mile radius) with their extension buildering j...
From £10,360
We are a family run business with over 30 years of combined experience, we offer everything from replacing doors and worktops on your kitchen to sm...
From £10,168
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Outbuilding costs in SG4 range from the cheapest of £9,704 (L P L Property Services Limited based in SG5) to the dearest of £10,512 (Building And Technology Systems Ltd based in SG4), 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 SG4 by posting a job with HaMuch and we will send it to extension builders.
"Outbuilding" - SG2, job posted 06/01/26
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Outbuilding near Hitchin | £43 | £283 |
| Outbuilding near Stevenage | £44 | £282 |
| Outbuilding near North Hertfordshire | £44 | £283 |
| Outbuilding near Letchworth | £44 | £283 |
| Outbuilding near Luton | £41 | £278 |
| Outbuilding near Harpenden | £86 | £315 |
| Outbuilding near Welwyn Garden City | £42 | £268 |
| Outbuilding near East Hertfordshire | £44 | £289 |
| Outbuilding near Mid Bedfordshire | £42 | £276 |
| Outbuilding near Hertford | £46 | £289 |
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