From £21,880
Experienced extension builder ready to quote for your work. CIA Construction Limited is the best extension builder in SS1. No obligation free quote...
From £22,360
Need an Extension Builder in SS1? Ellis & James Builders Limited has been helping local clients (20 mile radius) with their extension buildering jo...
From £22,008
Over 35 years experience
We are Gas Safe registered
We are Verified
We pride ourselves on great custom...
From £22,240
M&J Brickwork Ltd are a Chelmsford based Bricklaying & General Building company that operate throughout the Essex and South London...
From £22,176
Witton & Pearce Builders in Essex is a trusted extension builder serving customers in SS1 and the surrounding area. Contact us to today to get a co...
From £21,456
Experienced extension builder ready to quote for your work. Capital Roofing Ltd is the best extension builder in SS1. No obligation free quotes and...
From £22,272
P OUGHTON BUILDING is an established and experienced local extension builder in SS1. Please contact us for a free, no obligation quote and competit...
From £22,160
Property Maintenance are here to help customers who need an Extension Builder in SS1. We offer a competitive rate to complete all your extension bu...
From £21,056
35 years in the trade can Lay bricks plaster roofing wall and floor tiling
From £21,720
Need to find an Extension Builder near you for all your extension buildering work?
JLS Building Services provides a local, trusted extensio...

A flat roof extension ranges from the cheapest of £21,056 (S MEGSON CONSTRUCTION based in CT5) to the dearest of £22,360 (Ellis & James Builders Limited based in SS17), 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 SS1 by posting a job with HaMuch. We'll send it to extension builders in SS1.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Southend-on-Sea | £37 | £247 |
| Build A Flat Roof Extension near Canvey Island | £39 | £256 |
| Build A Flat Roof Extension near Thundersley | £38 | £251 |
| Build A Flat Roof Extension near Rayleigh | £39 | £252 |
| Build A Flat Roof Extension near Wickford | £39 | £255 |
| Build A Flat Roof Extension near Basildon | £39 | £251 |
| Build A Flat Roof Extension near Stanford-le-Hope | £40 | £254 |
| Build A Flat Roof Extension near Gillingham | £39 | £253 |
| Build A Flat Roof Extension near Sittingbourne | £35 | £246 |
| Build A Flat Roof Extension near Billericay | £38 | £248 |
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 - £17,433

Two storey extension - £87,899

Build a timber frame extension - £25,933

Build a swimming pool - £80,933

Single storey extension - £53,656

Side return extension - £40,744

Install an RSJ - £2,133

Outbuilding - £9,933

Build a Mansard loft conversion - £51,933

Loft conversion - £33,120

Build a kitchen extension - £41,933

Hip to gable loft conversion - £41,933

Granny annexe - £86,933

Garden office - £9,933

Convert a Garage - £15,933

Garage - £18,433

Build a flat roof extension - £21,933

Build a dormer loft conversion - £41,933

Concrete foundations - £6,183

Convert a bungalow loft - £28,933

Convert a basement - £36,744