Cost to build a flat roof extension in W11

Flat roof extension cost in W11

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 W11?

A flat roof extension ranges from the cheapest of £21,840 (Portobello Projects based in W11) to the dearest of £21,944 (Intellicasa based in W11), 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 W11 by posting a job with HaMuch. We'll send it to extension builders in W11.

Estimates for flat roof extension near W11

"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	£17,379
	Build a two storey extension	£87,819
	Build a timber frame extension	£25,879
	Install a swimming pool	£80,879
	Cost to build a single storey extension	£52,581
	Cost to build a side return extension	£40,139
	Install an RSJ	£2,079
	Build an outbuilding	£9,879
	Build a mansard loft conversion	£51,879
	Cost of a loft conversion	£32,616
	Build a kitchen extension	£41,879
	Build a hip to gable loft conversion	£41,879
	Build a granny annexe	£86,879
	Build a garden office	£9,879
	Convert a garage	£15,879
	Build a new garage	£18,379
	Build a flat roof extension	£21,879
	Build a dormer loft conversion	£41,879
	Lay a concrete foundation	£6,129
	Convert a bungalow loft	£28,879
	Basement conversion cost	£36,139

Business name	Flat roof extension cost
Portobello Projects, London, W11	£21,840
Intellicasa, Greater London, W11	£21,944
Translucent Studio, London, W11	£21,944
PEMBRIDGE CONSTRUCTION LTD, Notting Hill, W11	£21,864
Domus Italia - The Italian Contractor, London, W11	£21,944
Domus Italia - The Italian Contractor, 27a Pembridge Villas, Notting Hill, London, W11	£21,848
M & A UK Ltd, Notting Hill, W11	£21,888
Right Build Group, LONDON, W11	£21,920
MRJ Building Services, Notting Hill, W11	£21,888
HvB Development + Elnaz Namaki Studio, Studio 2, 48-49 Princes Place, London, Greater London, W11	£21,848
Hawkespur Ltd, London, Greater London, W2	£21,848
Home Healers Ltd., London, Greater London, W11	£21,848
One L Building Services, London, Greater London, W11	£21,848
Sam Loft, Notting Hill, W11	£21,888
Glenwood, 11 Ruston Mews, London, Greater London, W11	£21,848
Kappa Enterprises Ltd, 24 Evesham House, Hereford Road, London, Greater London, W2	£21,848
Jobbs, Greater London, W11	£21,944
Monroe Wolfe, Greater London, W2	£21,944
Inigo & Co., London, Greater London, W11	£21,848
Hamilton Park Properties, London, Greater London, W11	£21,848
Hamilton Park Properties, Greater London, W11	£21,944
EYKING, 12 Bassett Road, London, Greater London, W10	£21,848
Clearly Renovations Ltd, London, Greater London, W8	£21,848
Homeconcepts, London, Greater London, W8	£21,848
Alexander Build, 60 Kensington Church Street, Kensington & Chelsea, Greater London, W8	£21,848

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Flat roof extension cost in W11

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Flat roof extension cost in W11

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