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Mandala Building Services is a family-owned design and build maintenance company, encompassing everything from residential refurbishment to large-s...
J Wijayamohan
JJSR Construction Ltd is an established and experienced local extension builder in Borehamwood. Please contact us for a free, no obligation quote a...
Need to find an Extension Builder near you for all your extension buildering work?
BELLVIEW BUILDERS LTD provides a local, trusted extensio...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
SJ Expert Building Services are here to help customers who need an Extension Builder in Borehamwood. We offer a competitive rate to complete all yo...
Rafal Szczepanski
Our homes need to be regularly maintained and from time to time they need to be rejuvenated, modernised and enhanced. When it comes to building wor...
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...
Sharp Building Ltd is an established and experienced local extension builder in Borehamwood. Please contact us for a free, no obligation quote and ...
Mario Prajar Building Services is an established and experienced local extension builder in Borehamwood. Please contact us for a free, no obligatio...
RLC Construction are here to help customers who need an Extension Builder in Borehamwood. We offer a competitive rate to complete all your extensio...

A flat roof extension ranges from the cheapest of £22,024 (Mario Prajar Building Services based in HA2) to the dearest of £22,560 (Rafix Building based in EN4), 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 Borehamwood by posting a job with HaMuch. We'll send it to extension builders in Borehamwood.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Borehamwood | £42 | £271 |
| Build A Flat Roof Extension near High Barnet | £43 | £272 |
| Build A Flat Roof Extension near Bushey | £43 | £278 |
| Build A Flat Roof Extension near Potters Bar | £43 | £273 |
| Build A Flat Roof Extension near Brent Cross | £43 | £273 |
| Build A Flat Roof Extension near Watford | £43 | £280 |
| Build A Flat Roof Extension near Harrow | £43 | £270 |
| Build A Flat Roof Extension near Muswell Hill | £44 | £273 |
| Build A Flat Roof Extension near St Albans | £43 | £272 |
| Build A Flat Roof Extension near Hatfield | £42 | £266 |
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 - £17,804

Two storey extension - £88,456

Build a timber frame extension - £26,304

Build a swimming pool - £81,304

Single storey extension - £61,080

Side return extension - £44,920

Install an RSJ - £2,504

Outbuilding - £10,304

Build a Mansard loft conversion - £52,304

Loft conversion - £36,600

Build a kitchen extension - £42,304

Hip to gable loft conversion - £42,304

Granny annexe - £87,304

Garden office - £10,304

Convert a Garage - £16,304

Garage - £18,804

Build a flat roof extension - £22,304

Build a dormer loft conversion - £42,304

Concrete foundations - £6,554

Convert a bungalow loft - £29,304

Convert a basement - £40,920