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Experienced extension builder ready to quote for your work. C C OLEARY CONSTRUCTION is the best extension builder in West Sussex. No obligation fre...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Trusted and professional extension builder in West Sussex. Experienced in all extension buildering work and keeping within budget and on quote. Str...
M Wesley General Builder & Property Maintenance is a trusted extension builder serving customers in West Sussex and the surrounding area. Contact u...
Need to find an Extension Builder near you for all your extension buildering work?
FIRST FORMAT BUILDING provides a local, trusted extensio...
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...
Relax... you have found a reliable extension builder in West Sussex. Haynes & Scott Developments is a friendly and reliable company based in West S...
Trusted and professional extension builder in West Sussex. Experienced in all extension buildering work and keeping within budget and on quote. S J...
Relax... you have found a reliable extension builder in West Sussex. ONE BUILD is a friendly and reliable company based in West Sussex who consider...
ACF Carpentry Ltd is an established and experienced local extension builder in West Sussex. Please contact us for a free, no obligation quote and c...

Outbuilding costs in West Sussex range from the cheapest of £9,744 (ONE BUILD based in BN17) to the dearest of £10,200 (Alan Pacy Builder 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 West Sussex by posting a job with HaMuch and we will send it to extension builders.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Outbuilding near Worthing | £35 | £249 |
| Outbuilding near Lancing | £36 | £249 |
| Outbuilding near Shoreham-by-Sea | £36 | £250 |
| Outbuilding near Rustington | £35 | £242 |
| Outbuilding near Littlehampton | £35 | £241 |
| Outbuilding near Arun | £35 | £241 |
| Outbuilding near Brighton | £35 | £253 |
| Outbuilding near Brighton and Hove | £35 | £252 |
| Outbuilding near Bognor Regis | £35 | £247 |
| Outbuilding near Burgess Hill | £36 | £256 |
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 - £17,452

Two storey extension - £87,928

Build a timber frame extension - £25,952

Build a swimming pool - £80,952

Single storey extension - £54,040

Side return extension - £40,960

Install an RSJ - £2,152

Outbuilding - £9,952

Build a Mansard loft conversion - £51,952

Loft conversion - £33,300

Build a kitchen extension - £41,952

Hip to gable loft conversion - £41,952

Granny annexe - £86,952

Garden office - £9,952

Convert a Garage - £15,952

Garage - £18,452

Build a flat roof extension - £21,952

Build a dormer loft conversion - £41,952

Concrete foundations - £6,202

Convert a bungalow loft - £28,952

Convert a basement - £36,960