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Ricky Alexander
Trusted and professional extension builder in Portslade. Experienced in all extension buildering work and keeping within budget and on quote. RA Co...
Ferguson Building Services Limited is an established and experienced local extension builder in Portslade. Please contact us for a free, no obligat...
Graeme Davies
Experienced extension builder ready to quote for your work. Graeme Davies Plumbing and Heating is the best extension builder in Portslade. No oblig...
Need to find an Extension Builder near you for all your extension buildering work?
FIRST FORMAT BUILDING provides a local, trusted extensio...
Need an Extension Builder in Portslade? East West Refurbishment Limited has been helping local clients (20 mile radius) with their extension builde...
Citadel Construction is an established extension buildering business in Portslade. We come highly recommended and provide competitive quotes for yo...
The studio is based on our founder's vision in concept and interior design, Fabio Lauro has long been in the business of creating atmospheres. His ...
From £21,992
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...
Proper Copper DesignWe are a design lead copper homeware company specializing in contemporary handles, taps, showers and accessories. Our products ...
Experienced extension builder ready to quote for your work. Brighton Marina Hand Car Wash is the best extension builder in Portslade. No obligation...

A flat roof extension ranges from the cheapest of £21,768 (Graeme Davies Plumbing and Heating based in BN3) to the dearest of £22,800 (RA Construction based in BN2), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in Portslade by posting a job with HaMuch. We'll send it to extension builders in Portslade.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Shoreham-by-Sea | £36 | £250 |
| Build A Flat Roof Extension near Brighton | £35 | £253 |
| Build A Flat Roof Extension near Brighton and Hove | £35 | £252 |
| Build A Flat Roof Extension near Lancing | £36 | £249 |
| Build A Flat Roof Extension near Worthing | £35 | £249 |
| Build A Flat Roof Extension near Burgess Hill | £36 | £256 |
| Build A Flat Roof Extension near Haywards Heath | £35 | £256 |
| Build A Flat Roof Extension near Rustington | £35 | £242 |
| Build A Flat Roof Extension near Mid Sussex | £35 | £261 |
| Build A Flat Roof Extension near Littlehampton | £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 - £17,573

Two storey extension - £88,109

Build a timber frame extension - £26,073

Build a swimming pool - £81,073

Single storey extension - £56,456

Side return extension - £42,319

Install an RSJ - £2,273

Outbuilding - £10,073

Build a Mansard loft conversion - £52,073

Loft conversion - £34,433

Build a kitchen extension - £42,073

Hip to gable loft conversion - £42,073

Granny annexe - £87,073

Garden office - £10,073

Convert a Garage - £16,073

Garage - £18,573

Build a flat roof extension - £22,073

Build a dormer loft conversion - £42,073

Concrete foundations - £6,323

Convert a bungalow loft - £29,073

Convert a basement - £38,319