Cost to build a flat roof extension in SW19

Flat roof extension cost in SW19

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 SW19?

A flat roof extension ranges from the cheapest of £21,824 (Renaissance Timothy Brewer Ltd based in SW17) to the dearest of £22,240 (Silverain Limited based in SW19), 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 SW19 by posting a job with HaMuch. We'll send it to extension builders in SW19.

Estimates for flat roof extension near SW19

How much does a flat roof extension cost?
Flat roof extension cost per m2
Factors affecting the cost of flat roof extensions
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	Job	Estimate
	Underpinning a house	£17,400
	Build a two storey extension	£87,850
	Build a timber frame extension	£25,900
	Install a swimming pool	£80,900
	Cost to build a single storey extension	£52,997
	Cost to build a side return extension	£40,373
	Install an RSJ	£2,100
	Build an outbuilding	£9,900
	Build a mansard loft conversion	£51,900
	Cost of a loft conversion	£32,811
	Build a kitchen extension	£41,900
	Build a hip to gable loft conversion	£41,900
	Build a granny annexe	£86,900
	Build a garden office	£9,900
	Convert a garage	£15,900
	Build a new garage	£18,400
	Build a flat roof extension	£21,900
	Build a dormer loft conversion	£41,900
	Lay a concrete foundation	£6,150
	Convert a bungalow loft	£28,900
	Basement conversion cost	£36,373

Business name	Flat roof extension cost
Firman Reece Ltd, 11 Alexandra Road, London, Greater London, SW19	£21,840
Design Manage Build, Worple road mews, Wimbledon, London, Sw19	£21,840
DesignBox Architecture Limited, London, SW19	£21,880
Silverain Limited, London , SW19	£22,240
TTG CONSTRUCTION LTD, Wimbledon, SW19	£21,856
London Dream Building, London, Greater London, SW19	£21,840
London Dream Building, Greater London, SW19	£21,944
Westgate & Keele, London, Surrey, SW19	£21,840
ACE BUILDING CONTRACTORS AND D, Wimbledon, SW19	£21,856
HJPM, Londonderry, sw19	£21,944
Affleck Property Services, London, Greater London, SW17	£21,840
London Construct & Design, Greater London, SW19	£21,944
You Nailed It Ltd, London, SW19	£21,944
J & D Construction, Wimbledon, SW19	£21,864
Permanex Building Services, 94 Summerstown, London, SW17	£21,840
RELM Interiors Ltd, 50 Southdown Road, London, Greater London, SW20	£21,944
RECOM Construction, Greater London, SW20	£21,944
SURREY HOME & GARDEN SERVICES, London, SW20	£21,960
My Design Needs / Modernation Ltd., Greater London, SW20	£21,936
Sonik Building Services, Wimbledon, SW19	£21,880
A to Z Painters & Decorators, Wimbledon, SW19	£21,856
Renaissance Timothy Brewer Ltd, Tooting, SW17	£21,824
MIKO BUILDING SOLUTIONS, Wimbledon, SW19	£21,856
Arkadia Properties Ltd, Greater London, SW20	£21,944
Thompson McCabe, Dalton House, 60 Windsor Avenue, London, Greater London, SW19	£21,840

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Flat roof extension cost in SW19

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Flat roof extension cost in SW19

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