From £22,008
Need to find an Extension Builder near you for all your extension buildering work?
Tj's Fencing provides a local, trusted extension builder...
From £21,808
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £21,936
Extensions, Refurbishments & Loft ConversionsAt Keystone our mission is to help our clients imagine, design & build environments that enhance their...
From £22,112
Experienced extension builder ready to quote for your work. MRA CONSTRUCTION is the best extension builder in Mid Sussex. No obligation free quotes...
From £22,600
Rjscarpentryconstruction is a well established company with over 30 years of experience in the carpentry and construction industries
From £21,848
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £21,288
I have been in the building trade for over 20 years and run my own business for the last 10 years. I am very reliable and have plenty of experience...
From £21,856
HEVIN BUILDERS is an established extension buildering business in Mid Sussex. We come highly recommended and provide competitive quotes for your wo...
From £22,360
TOLLEY CARPENTRY is an established extension buildering business in Mid Sussex. We come highly recommended and provide competitive quotes for your ...
From £22,064
JG Brickwork Services Limited is an established extension buildering business in Mid Sussex. We come highly recommended and provide competitive quo...

A flat roof extension ranges from the cheapest of £21,288 (JUST ONE BUILDING SERVICES based in RH11) to the dearest of £22,600 (RJ's Carpentry Construction based in RH15), 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 Mid Sussex by posting a job with HaMuch. We'll send it to extension builders in Mid Sussex.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Mid Sussex | £35 | £261 |
| Build A Flat Roof Extension near Haywards Heath | £35 | £256 |
| Build A Flat Roof Extension near Burgess Hill | £36 | £240 |
| Build A Flat Roof Extension near Crawley | £38 | £255 |
| Build A Flat Roof Extension near East Grinstead | £37 | £259 |
| Build A Flat Roof Extension near Horsham | £38 | £265 |
| Build A Flat Roof Extension near Horley | £38 | £258 |
| Build A Flat Roof Extension near Crowborough | £36 | £258 |
| Build A Flat Roof Extension near Brighton and Hove | £35 | £251 |
| Build A Flat Roof Extension near Redhill | £41 | £269 |
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 - £17,488

Two storey extension - £87,982

Build a timber frame extension - £25,988

Build a swimming pool - £80,988

Single storey extension - £54,760

Side return extension - £41,365

Install an RSJ - £2,188

Outbuilding - £9,988

Build a Mansard loft conversion - £51,988

Loft conversion - £33,638

Build a kitchen extension - £41,988

Hip to gable loft conversion - £41,988

Granny annexe - £86,988

Garden office - £9,988

Convert a Garage - £15,988

Garage - £18,488

Build a flat roof extension - £21,988

Build a dormer loft conversion - £41,988

Concrete foundations - £6,238

Convert a bungalow loft - £28,988

Convert a basement - £37,365