Cost to build a flat roof extension in SW5

Flat roof extension cost in SW5

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 SW5?

A flat roof extension ranges from the cheapest of £21,840 (Gatta Star Group ltd based in SW10) 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 SW5 by posting a job with HaMuch. We'll send it to extension builders in SW5.

Estimates for flat roof extension near SW5

"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	£17,414
	Build a two storey extension	£87,871
	Build a timber frame extension	£25,914
	Install a swimming pool	£80,914
	Cost to build a single storey extension	£53,278
	Cost to build a side return extension	£40,532
	Install an RSJ	£2,114
	Build an outbuilding	£9,914
	Build a mansard loft conversion	£51,914
	Cost of a loft conversion	£32,943
	Build a kitchen extension	£41,914
	Build a hip to gable loft conversion	£41,914
	Build a granny annexe	£86,914
	Build a garden office	£9,914
	Convert a garage	£15,914
	Build a new garage	£18,414
	Build a flat roof extension	£21,914
	Build a dormer loft conversion	£41,914
	Lay a concrete foundation	£6,164
	Convert a bungalow loft	£28,914
	Basement conversion cost	£36,532

Business name	Flat roof extension cost
Gatta Star Group ltd, London, Greater London, SW10	£21,840
TELEMARK CONSTRUCTION LTD, Earl's Court, SW5	£21,864
Short Let Management Ltd, Greater London, SW10	£21,944
Leufroy, Greater London, SW5	£21,944
Leufroy, 62 Kenway Road, London, Greater London, SW5	£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
Hartley Homes, 97 Old Brompton Road, South Kensington, Greater London, SW7	£21,840
Ventura Property Developments, Ground Floor Office, 97 Old Brompton Road, London, SW7	£21,840
Crosshatch, London, Greater London, SW3	£21,840
Crosshatch, Greater London, SW3	£21,944
Green Inside Limited T/A Dnomyar Interiors, 11 Bute Street, London, Greater London, SW7	£21,944
GMSquare Ltd, Greater London, SW6	£21,944
MS Contractor Ltd, Greater London, SW10	£21,944
MALLETT, London, Greater London, W8	£21,848
chasewood maintenance, london, sw6	£21,840
FrontierstroyUK, Greater London, W8	£21,944
Monica Davis Property Limited, London, SW10	£21,944
ELLEN MARTIN, London, Greater London, SW6	£21,840
Klai Construction , London, SW7	£22,400
H G Builders, Fulham, London, SW6	£22,000
Vyas Design, South Ayrshire, W8	£21,944
DAMA CONSTRUCTION LTD, West Kensington, W14	£21,864
Rose Narmani, Greater London, W8	£21,944
The Architects Of London, 239 Kensington High Street, London, Greater London, W8	£21,848

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Flat roof extension cost in SW5

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Flat roof extension cost in SW5

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