Cost to build a flat roof extension in Kensington

Flat roof extension cost in Kensington

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 Kensington?

A flat roof extension ranges from the cheapest of £21,832 (Griana Builds based in W14) to the dearest of £21,944 (FrontierstroyUK based in W8), 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 Kensington by posting a job with HaMuch. We'll send it to extension builders in Kensington.

Estimates for flat roof extension near Kensington

"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	£17,387
	Build a two storey extension	£87,831
	Build a timber frame extension	£25,887
	Install a swimming pool	£80,887
	Cost to build a single storey extension	£52,747
	Cost to build a side return extension	£40,233
	Install an RSJ	£2,087
	Build an outbuilding	£9,887
	Build a mansard loft conversion	£51,887
	Cost of a loft conversion	£32,694
	Build a kitchen extension	£41,887
	Build a hip to gable loft conversion	£41,887
	Build a granny annexe	£86,887
	Build a garden office	£9,887
	Convert a garage	£15,887
	Build a new garage	£18,387
	Build a flat roof extension	£21,887
	Build a dormer loft conversion	£41,887
	Lay a concrete foundation	£6,137
	Convert a bungalow loft	£28,887
	Basement conversion cost	£36,233

Business name	Flat roof extension cost
FrontierstroyUK, Greater London, W8	£21,944
Vyas Design, South Ayrshire, W8	£21,944
Rose Narmani, Greater London, W8	£21,944
London Roofing Specialist Limited, Greater London, W8	£21,944
Broseley, London, W8	£21,848
Huntsmore, 96 Kensington High Street, London, Greater London, W8	£21,848
GSP, Greater London, W8	£21,944
Varga Homes Renovation, Greater London, W8	£21,944
The Architects Of London, 239 Kensington High Street, London, Greater London, W8	£21,848
MALLETT, 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
Clearly Renovations Ltd, London, Greater London, W8	£21,848
Leufroy, 62 Kenway Road, London, Greater London, SW5	£21,848
Leufroy, Greater London, SW5	£21,944
Jeffery and Wilkes, International House,, 142 Cromwell Road, Kensington, London, Greater London, SW7	£21,848
OL AND EDWARD LTD, 142 Cromwell Road, London, SW7	£21,848
2MO, London, Greater London, W14	£21,848
2MO, Greater London, W14	£21,944
Griana Builds, London, W14	£21,832
Home Healers Ltd., London, Greater London, W11	£21,848
M & A UK Ltd, Notting Hill, W11	£21,888
home refurbishments, London, Greater London, W14	£21,848
Monroe Wolfe, Greater London, W2	£21,944
Intellicasa, Greater London, W11	£21,944

Extend your Kensington with an extension

Flat roof extension cost in Kensington

Estimates for common extension builder jobs in Kensington;

Rates for other Kensington trades

Flat roof extension cost in Kensington

Get extension builder rates instantly