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Ferguson Building Services Limited is an established and experienced local extension builder in Steyning. Please contact us for a free, no obligati...
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 Steyning. Experienced in all extension buildering work and keeping within budget and on quote. Stretc...
Need to find an Extension Builder near you for all your extension buildering work?
FIRST FORMAT BUILDING provides a local, trusted extensio...
From £37,410
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...
Proper Copper DesignWe are a design lead copper homeware company specializing in contemporary handles, taps, showers and accessories. Our products ...
Trusted and professional extension builder in Steyning. Experienced in all extension buildering work and keeping within budget and on quote. Good C...
ACF Carpentry Ltd is an established and experienced local extension builder in Steyning. Please contact us for a free, no obligation quote and comp...
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 Steyning. Experienced in all extension buildering work and keeping within budget and on quote. BRICKT...

Comparing extension builders estimates for a Convert a basement gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for the cost to convert a basement in Steyning by posting a job with HaMuch and we will send it to extension builders in Steyning.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Convert A Basement near Lancing | £36 | £249 |
| Convert A Basement near Shoreham-by-Sea | £36 | £250 |
| Convert A Basement near Worthing | £35 | £249 |
| Convert A Basement near Rustington | £35 | £242 |
| Convert A Basement near Brighton | £35 | £253 |
| Convert A Basement near Brighton and Hove | £35 | £252 |
| Convert A Basement near Burgess Hill | £36 | £256 |
| Convert A Basement near Littlehampton | £35 | £241 |
| Convert A Basement near Horsham | £38 | £265 |
| Convert A Basement near Arun | £35 | £241 |
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 - £17,551

Two storey extension - £88,077

Build a timber frame extension - £26,051

Build a swimming pool - £81,051

Single storey extension - £56,024

Side return extension - £42,076

Install an RSJ - £2,251

Outbuilding - £10,051

Build a Mansard loft conversion - £52,051

Loft conversion - £34,230

Build a kitchen extension - £42,051

Hip to gable loft conversion - £42,051

Granny annexe - £87,051

Garden office - £10,051

Convert a Garage - £16,051

Garage - £18,551

Build a flat roof extension - £22,051

Build a dormer loft conversion - £42,051

Concrete foundations - £6,301

Convert a bungalow loft - £29,051

Convert a basement - £38,076