Cost to build a flat roof extension in SW7

Flat roof extension cost in SW7

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 SW7?

A flat roof extension ranges from the cheapest of £21,840 (Ventura Property Developments based in SW7) to the dearest of £22,400 (Klai Construction based in SW7), 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 SW7 by posting a job with HaMuch. We'll send it to extension builders in SW7.

Estimates for flat roof extension near SW7

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?
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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	£17,409
	Build a two storey extension	£87,864
	Build a timber frame extension	£25,909
	Install a swimming pool	£80,909
	Cost to build a single storey extension	£53,182
	Cost to build a side return extension	£40,478
	Install an RSJ	£2,109
	Build an outbuilding	£9,909
	Build a mansard loft conversion	£51,909
	Cost of a loft conversion	£32,898
	Build a kitchen extension	£41,909
	Build a hip to gable loft conversion	£41,909
	Build a granny annexe	£86,909
	Build a garden office	£9,909
	Convert a garage	£15,909
	Build a new garage	£18,409
	Build a flat roof extension	£21,909
	Build a dormer loft conversion	£41,909
	Lay a concrete foundation	£6,159
	Convert a bungalow loft	£28,909
	Basement conversion cost	£36,478

Business name	Flat roof extension cost
Klai Construction , London, SW7	£22,400
Green Inside Limited T/A Dnomyar Interiors, 11 Bute Street, London, Greater London, SW7	£21,944
Ventura Property Developments, Ground Floor Office, 97 Old Brompton Road, London, SW7	£21,840
Hartley Homes, 97 Old Brompton Road, South Kensington, Greater London, SW7	£21,840
Clarisford, Greater London, SW3	£21,944
Clarisford, London, Greater London, SW3	£21,840
Hearne House, London, Greater London, SW3	£21,840
Crosshatch, London, Greater London, SW3	£21,840
Crosshatch, Greater London, SW3	£21,944
MALLETT, London, Greater London, W8	£21,848
OL AND EDWARD LTD, 142 Cromwell Road, London, SW7	£21,848
Jeffery and Wilkes, International House,, 142 Cromwell Road, Kensington, London, Greater London, SW7	£21,848
Cobalt Interiors, London, Greater London, SW7	£21,944
Knightsbridge Design, Greater London, SW1X	£21,944
Oro Projects, 13 Radnor Walk, London, Greater London, SW3	£21,840
ADOVA, London, Greater London, SW3	£21,840
Sloane Ave Renovations, 130 Sloane Street, London, Greater London, SW1X	£21,840
Autas Developments, London, SW1W	£21,944
Property Refurbishment London, 21 Ellis Street, Sloane Square, London, Greater London, SW1X	£21,840
Leufroy, 62 Kenway Road, London, Greater London, SW5	£21,848
Leufroy, Greater London, SW5	£21,944
Varga Homes Renovation, Greater London, W8	£21,944
ALT CONSTRUCTION, Greater London, SW1W	£21,944
Builders by Design Ltd, Greater London, SW3	£21,936
FrontierstroyUK, Greater London, W8	£21,944

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Flat roof extension cost in SW7

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Flat roof extension cost in SW7

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