From £10,440
Need to find an Extension Builder near you for all your extension buildering work?
Main Construction provides a local, trusted extension bu...
From £9,872
Need an Extension Builder in RH13? MPS Home Improvements Ltd has been helping local clients (20 mile radius) with their extension buildering jobs f...
From £10,328
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £9,992
Member since August 2026
H P Building Services Sussex is a one-stop solution for all your extension buildering needs. Establish over 10 years ago and covering 20 miles arou...
From £10,272
Need to find an Extension Builder near you for all your extension buildering work?
DPP Construction (David Price Partnership) provides a lo...
From £10,168
R S Construction (Surrey) is an established extension buildering business in RH13. We come highly recommended and provide competitive quotes for yo...
From £10,032
We are a family run business we 40 years experience delivering multiple projects from new developments . Extension. Loft conversion. Including foun...
From £10,112
, BN18
Futureways Design and Build are here to help customers who need an Extension Builder in RH13. We offer a competitive rate to complete all your exte...
From £10,200
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £10,408
Garage Door Repairs is an established extension buildering business in RH13. We come highly recommended and provide competitive quotes for your wor...

Outbuilding costs in RH13 range from the cheapest of £9,872 (MPS Home Improvements Ltd based in RH14) to the dearest of £10,440 (Main Construction based in BN12), 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 RH13 by posting a job with HaMuch and we will send it to extension builders.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Outbuilding near Horsham | £38 | £265 |
| Outbuilding near Mid Sussex | £35 | £261 |
| Outbuilding near Crawley | £38 | £255 |
| Outbuilding near Burgess Hill | £36 | £240 |
| Outbuilding near Haywards Heath | £35 | £256 |
| Outbuilding near Horley | £38 | £258 |
| Outbuilding near Shoreham-by-Sea | £36 | £250 |
| Outbuilding near Lancing | £37 | £251 |
| Outbuilding near Reigate | £40 | £270 |
| Outbuilding near East Grinstead | £37 | £259 |
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 - £17,682

Two storey extension - £88,274

Build a timber frame extension - £26,182

Build a swimming pool - £81,182

Single storey extension - £58,648

Side return extension - £43,552

Install an RSJ - £2,382

Outbuilding - £10,182

Build a Mansard loft conversion - £52,182

Loft conversion - £35,460

Build a kitchen extension - £42,182

Hip to gable loft conversion - £42,182

Granny annexe - £87,182

Garden office - £10,182

Convert a Garage - £16,182

Garage - £18,682

Build a flat roof extension - £22,182

Build a dormer loft conversion - £42,182

Concrete foundations - £6,432

Convert a bungalow loft - £29,182

Convert a basement - £39,552