Cost to build a flat roof extension in W12

Flat roof extension cost in W12

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 W12?

A flat roof extension ranges from the cheapest of £21,832 (JNJ Building Services Ltd based in W12) to the dearest of £21,944 (The Great Wolf Construction based in W12), 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 W12 by posting a job with HaMuch. We'll send it to extension builders in W12.

Estimates for flat roof extension near W12

"Flat roof extension for a period mews terraced house. We'd like a bedroom extension with full bathroom and a roof top terrace. Footprint is roughly 8.5m x 6m."

How much does a flat roof extension cost?
Flat roof extension cost per m2
Factors affecting the cost of flat roof extensions
Advantages and disadvantages of flat roofs
Which is cheaper: a flat roof or pitched roof?
How long does a flat roof extension take?
Do you need planning permission for a flat roof extension?
How long does a flat roof last?
Can you walk on a flat roof extension?
What insulation do I need for a flat roof extension?

	Job	Estimate
	Underpinning a house	£17,399
	Build a two storey extension	£87,849
	Build a timber frame extension	£25,899
	Install a swimming pool	£80,899
	Cost to build a single storey extension	£52,984
	Cost to build a side return extension	£40,366
	Install an RSJ	£2,099
	Build an outbuilding	£9,899
	Build a mansard loft conversion	£51,899
	Cost of a loft conversion	£32,805
	Build a kitchen extension	£41,899
	Build a hip to gable loft conversion	£41,899
	Build a granny annexe	£86,899
	Build a garden office	£9,899
	Convert a garage	£15,899
	Build a new garage	£18,399
	Build a flat roof extension	£21,899
	Build a dormer loft conversion	£41,899
	Lay a concrete foundation	£6,149
	Convert a bungalow loft	£28,899
	Basement conversion cost	£36,366

Business name	Flat roof extension cost
Graham Construction, Shepherd's Bush, W12	£21,888
The Great Wolf Construction, Londonderry, W12	£21,944
Newpark Construction, Shepherd's Bush, W12	£21,888
Add Global, 71 Golhawk Road, London, Greater London, W12	£21,848
Clay Design & Build, Greater London, W12	£21,944
GWS Roofing Specialists, London, Greater London, W12	£21,944
Heaven Sent Construction, Shepherd's Bush, W12	£21,888
Natalia Kennerley, Greater London, W12	£21,944
Hammerhead General Contractors Ltd, London, Greater London, W12	£21,848
Sam Loft, Notting Hill, W11	£21,888
IC&T PROJECTS, Greater London, W12	£21,944
HUGHES BUILDERS, Shepherd's Bush, W12	£21,888
JNJ Building Services Ltd, 151 Askew Road, Hammersmith, London, Lon, W12	£21,832
Baes design ltd, Greater London, W10	£21,944
Jonathan P Spencer Design and Build Limited, London, Greater London, W6	£21,848
HvB Development + Elnaz Namaki Studio, Studio 2, 48-49 Princes Place, London, Greater London, W11	£21,848
One L Building Services, London, Greater London, W11	£21,848
Haris Builders, London, W12	£21,944
MRJ Building Services, Notting Hill, W11	£21,888
Jobbs, Greater London, W11	£21,944
GB Buildings & Renovations, London, London, Greater London, W6	£21,848
Robert & Sons, Surrey, W10	£21,944
Neoliydia Ltd & Echinus Design Studio, Greater London, W12	£21,944
Neoliydia Ltd & Echinus Design Studio, London, Greater London, W12	£21,848
K & S, London, W10	£21,944

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Flat roof extension cost in W12

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Flat roof extension cost in W12

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