Extend your BS37 with an extension

A flat roof extension is a great way to add extra space to your home without splashing out on the costs of a pitched roof extension. Often exempt from planning permission rules, you can build a flat roof extension up to 3 metres in height as long as it's not visible from a road. But how much do they cost in BS37?

Build a flat roof extension cost in BS37 - Sort by rates or availability

A M I Construction

From £21,880

(last active 02/10/26)

Location

Caldicot, NP26

Relax... you have found a reliable extension builder in BS37. A M I Construction is a friendly and reliable company based in BS37 who consider no j...

J SUTTON CONSTRUCTION

From £21,720

(last active 01/10/26)

Location

Stroud, GL5

Relax... you have found a reliable extension builder in BS37. J SUTTON CONSTRUCTION is a friendly and reliable company based in BS37 who consider n...

Sunnyside Property Developments

From £21,944

(last active 01/10/26)

Location

Avon, BS48

Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

SMJ Construction

From £21,856

(last active 30/09/26)

Location

Downend, BS16

Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

N J Laity & Son & Grandson's

From £22,296

(last active 30/09/26)

Location

Brentry, BS10

N J Laity & Son & Grandson's are here to help customers who need an Extension Builder in BS37. We offer a competitive rate to complete all your ext...

MOORLAND DESIGN & BUILD LTD

From £21,840

(last active 30/09/26)

Location

Nailsea, BS48

MOORLAND DESIGN & BUILD LTD are here to help customers who need an Extension Builder in BS37. We offer a competitive rate to complete all your exte...

Neil Causon & Son

From £21,728

(last active 30/09/26)

Location

Clevedon, BS21

Neil Causon & Son is an established and experienced local extension builder in BS37. Please contact us for a free, no obligation quote and competit...

Mucha Construcion

From £21,824

(last active 30/09/26)

Location

Brentry, BS10

Need an Extension Builder in BS37? Mucha Construcion has been helping local clients (20 mile radius) with their extension buildering jobs for many ...

GARY G BOND LIMITED

From £22,544

(last active 27/09/26)

Location

Bristol, BS16

GARY G BOND LIMITED are here to help customers who need an Extension Builder in BS37. We offer a competitive rate to complete all your extension bu...

RD Pope Construction

From £21,920

(last active 26/09/26)

Location

Bristol, BS7

Relax... you have found a reliable extension builder in BS37. RD Pope Construction is a friendly and reliable company based in BS37 who consider no...

Flat roof extension cost in BS37

Estimates for build a flat roof extension near BS37

A flat roof extension ranges from the cheapest of £21,720 (J SUTTON CONSTRUCTION based in GL5) to the dearest of £22,544 (GARY G BOND LIMITED based in BS16), 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 BS37 by posting a job with HaMuch. We'll send it to extension builders in BS37.


Get extension builder rates instantly

Get extension builder rates instantly (excluding VAT or callout charges)
Location in UKHourly RateDaily Rate
Build A Flat Roof Extension near Yate£34£263
Build A Flat Roof Extension near South Gloucestershire£34£260
Build A Flat Roof Extension near Bradley Stoke£34£259
Build A Flat Roof Extension near Kingswood£34£257
Build A Flat Roof Extension near Bristol£33£255
Build A Flat Roof Extension near Keynsham£33£251
Build A Flat Roof Extension near Clifton£33£255
Build A Flat Roof Extension near Chippenham£34£258
Build A Flat Roof Extension near Portishead£33£247
Build A Flat Roof Extension near Bath£32£249

Estimates for common extension builder jobs in BS37;

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

Underpin a building - £17,455

Two storey extension

Two storey extension - £87,933

Build a timber frame extension

Build a timber frame extension - £25,955

Build a swimming pool

Build a swimming pool - £80,955

Single storey extension

Single storey extension - £54,104

Side return extension

Side return extension - £40,996

Install an RSJ

Install an RSJ - £2,155

Outbuilding

Outbuilding - £9,955

Build a Mansard loft conversion

Build a Mansard loft conversion - £51,955

Loft conversion

Loft conversion - £33,330

Build a kitchen extension

Build a kitchen extension - £41,955

Hip to gable loft conversion

Hip to gable loft conversion - £41,955

Granny annexe

Granny annexe - £86,955

Garden office

Garden office - £9,955

Convert a Garage

Convert a Garage - £15,955

Garage

Garage - £18,455

Build a flat roof extension

Build a flat roof extension - £21,955

Build a dormer loft conversion

Build a dormer loft conversion - £41,955

Concrete foundations

Concrete foundations - £6,205

Convert a bungalow loft

Convert a bungalow loft - £28,955

Convert a basement

Convert a basement - £36,996

More extensions & conversions cost guides...