Cost to build a flat roof extension in SW3

Flat roof extension cost in SW3

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 SW3?

A flat roof extension ranges from the cheapest of £21,840 (ADOVA based in SW3) 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 SW3 by posting a job with HaMuch. We'll send it to extension builders in SW3.

Estimates for flat roof extension near SW3

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	£17,417
	Build a two storey extension	£87,875
	Build a timber frame extension	£25,917
	Install a swimming pool	£80,917
	Cost to build a single storey extension	£53,336
	Cost to build a side return extension	£40,564
	Install an RSJ	£2,117
	Build an outbuilding	£9,917
	Build a mansard loft conversion	£51,917
	Cost of a loft conversion	£32,970
	Build a kitchen extension	£41,917
	Build a hip to gable loft conversion	£41,917
	Build a granny annexe	£86,917
	Build a garden office	£9,917
	Convert a garage	£15,917
	Build a new garage	£18,417
	Build a flat roof extension	£21,917
	Build a dormer loft conversion	£41,917
	Lay a concrete foundation	£6,167
	Convert a bungalow loft	£28,917
	Basement conversion cost	£36,564

Business name	Flat roof extension cost
ADOVA, London, Greater London, SW3	£21,840
Oro Projects, 13 Radnor Walk, London, Greater London, SW3	£21,840
Clarisford, Greater London, SW3	£21,944
Clarisford, London, Greater London, SW3	£21,840
Autas Developments, London, SW1W	£21,944
Haus to Home, Greater London, SW3	£21,936
Sloane Ave Renovations, 130 Sloane Street, London, Greater London, SW1X	£21,840
Property Refurbishment London, 21 Ellis Street, Sloane Square, London, Greater London, SW1X	£21,840
Builders by Design Ltd, Greater London, SW3	£21,936
Hearne House, London, Greater London, SW3	£21,840
ALT CONSTRUCTION, Greater London, SW1W	£21,944
Crosshatch, Greater London, SW3	£21,944
Crosshatch, London, Greater London, SW3	£21,840
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
Green Inside Limited T/A Dnomyar Interiors, 11 Bute Street, London, Greater London, SW7	£21,944
Knightsbridge Design, Greater London, SW1X	£21,944
Klai Construction , London, SW7	£22,400
Monica Davis Property Limited, London, SW10	£21,944
Royale Renovations, Battersea, SW11	£21,880
Eerospace, Londonderry, SW11	£21,936
Luxury Movement, London, Greater London, SW1V	£21,840
Cobalt Interiors, London, Greater London, SW7	£21,944
MS Contractor Ltd, Greater London, SW10	£21,944
novospace ltd, Greater London, SW11	£21,936

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Flat roof extension cost in SW3

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Flat roof extension cost in SW3

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