Cost to build a flat roof extension in Whitehall

Flat roof extension cost in Whitehall

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 Whitehall?

A flat roof extension ranges from the cheapest of £20,160 (London Design And Build based in SW1A) to the dearest of £21,944 (Adamko Dry Lining London based in WC2N), 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 Whitehall by posting a job with HaMuch. We'll send it to extension builders in Whitehall.

Estimates for flat roof extension near Whitehall

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	£17,332
	Build a two storey extension	£87,748
	Build a timber frame extension	£25,832
	Install a swimming pool	£80,832
	Cost to build a single storey extension	£51,646
	Cost to build a side return extension	£39,614
	Install an RSJ	£2,032
	Build an outbuilding	£9,832
	Build a mansard loft conversion	£51,832
	Cost of a loft conversion	£32,178
	Build a kitchen extension	£41,832
	Build a hip to gable loft conversion	£41,832
	Build a granny annexe	£86,832
	Build a garden office	£9,832
	Convert a garage	£15,832
	Build a new garage	£18,332
	Build a flat roof extension	£21,832
	Build a dormer loft conversion	£41,832
	Lay a concrete foundation	£6,082
	Convert a bungalow loft	£28,832
	Basement conversion cost	£35,614

Business name	Flat roof extension cost
London Projects Ltd, 11 Carteret Street, London, Greater London, SW1H	£21,848
Adamko Dry Lining London, Greater London, WC2N	£21,944
London Design And Build , Roehampton, SW1A	£20,160
A to Z Builders Ltd, Houses of Parliament, SW1P	£21,880
Elv8 Interiors, Greater London, W1B	£21,944
Mayfair Design, Greater London, W1J	£21,944
Luxe Refurbs, 16 Berkeley Street, London, Greater London, W1J	£21,840
F & F Building Services, Houses of Parliament, SW1P	£21,880
We Love Build - Three Arches, London, Greater London, W1J	£21,840
We Love Build, Greater London, W1J	£21,944
Big Mamma, Greater London, W1F	£21,944
The Maybria Group, Mayfair, Greater London, W1J	£21,848
Future Homes Design and Build, 4 Old Park Lane, Mayfair, London, W1K	£21,848
Cornerstone, Greater London, W1F	£21,944
Sehem Design, london, W1F	£21,944
Starfish Properties, 14 Hanover Street, 3rd Floor, London, W1S	£21,848
House Rendering Ltd, 71-75, Shelton Street, Covent Garden, Greater London, WC2H	£21,848
Matstone Projects Limited, Greater London, WC2H	£21,944
My Lady Builder, Greater London, WC2H	£21,944
Whitehorse Build London, Greater London, WC2H	£21,944
ElleHaus, Greater London, WC2H	£21,944
My Trusted Builder, London, Greater London, wc2h	£21,848
ORO Projects, Greater London, WC2H	£21,944
HouseUP, 71-75 Shelton Street, Covent Garden, London, WC2H	£21,848
Gil Construction Ltd, Greater London, WC2H	£21,944

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Flat roof extension cost in Whitehall

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Flat roof extension cost in Whitehall

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