From £22,264
Billericay Loft Conversions is a trusted extension builder serving customers in CM11 and the surrounding area. Contact us to today to get a competi...
From £21,936
Need to find an Extension Builder near you for all your extension buildering work?
D J J BRICKWORK LIMITED provides a local, trusted extens...
From £22,008
Experienced extension builder ready to quote for your work. ABS Building Specialists is the best extension builder in CM11. No obligation free quot...
From £21,864
Need to find an Extension Builder near you for all your extension buildering work?
RV BUILDING & MAINTENANCE provides a local, trusted exte...
From £21,776
Rimantas is an established extension buildering business in CM11. We come highly recommended and provide competitive quotes for your work.
From £22,168
Need to find an Extension Builder near you for all your extension buildering work?
Essex Conservatories provides a local, trusted extension...
From £21,952
Need an Extension Builder in CM11? PAUL BAILEY CONSTRUCTION has been helping local clients (20 mile radius) with their extension buildering jobs fo...
From £22,288
Relax... you have found a reliable extension builder in CM11. PBS Homes Ltd is a friendly and reliable company based in CM11 who consider no job as...
From £21,880
Concept Interiors Management Ltd is a trusted extension builder serving customers in CM11 and the surrounding area. Contact us to today to get a co...
From £21,976
We are a family run business that have experience of over 30 years in property maintenance, estate agents and insurance works. We provide ...

A flat roof extension ranges from the cheapest of £21,776 (Rimantas based in CM12) to the dearest of £22,288 (PBS Homes Ltd based in CM4), 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 CM11 by posting a job with HaMuch. We'll send it to extension builders in CM11.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Billericay | £38 | £248 |
| Build A Flat Roof Extension near Basildon | £39 | £251 |
| Build A Flat Roof Extension near Wickford | £39 | £255 |
| Build A Flat Roof Extension near Brentwood | £39 | £256 |
| Build A Flat Roof Extension near Stanford-le-Hope | £40 | £254 |
| Build A Flat Roof Extension near Rayleigh | £39 | £252 |
| Build A Flat Roof Extension near Thundersley | £38 | £251 |
| Build A Flat Roof Extension near Chelmsford | £38 | £258 |
| Build A Flat Roof Extension near Canvey Island | £39 | £256 |
| Build A Flat Roof Extension near Thurrock | £41 | £260 |
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 - £17,511

Two storey extension - £88,017

Build a timber frame extension - £26,011

Build a swimming pool - £81,011

Single storey extension - £55,224

Side return extension - £41,626

Install an RSJ - £2,211

Outbuilding - £10,011

Build a Mansard loft conversion - £52,011

Loft conversion - £33,855

Build a kitchen extension - £42,011

Hip to gable loft conversion - £42,011

Granny annexe - £87,011

Garden office - £10,011

Convert a Garage - £16,011

Garage - £18,511

Build a flat roof extension - £22,011

Build a dormer loft conversion - £42,011

Concrete foundations - £6,261

Convert a bungalow loft - £29,011

Convert a basement - £37,626