Cost to build a flat roof extension in NW3

Flat roof extension cost in NW3

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 NW3?

A flat roof extension ranges from the cheapest of £21,840 (R&Co Property Development Ltd based in NW8) to the dearest of £22,400 (ELJHANI BUILDING & PROPERTY MANAGEMENT SERVICES LTD based in NE4), 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 NW3 by posting a job with HaMuch. We'll send it to extension builders in NW3.

Estimates for flat roof extension near NW3

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	£87,870
	Build a timber frame extension	£25,914
	Install a swimming pool	£80,914
	Cost to build a single storey extension	£53,272
	Cost to build a side return extension	£40,528
	Install an RSJ	£2,114
	Build an outbuilding	£9,914
	Build a mansard loft conversion	£51,914
	Cost of a loft conversion	£32,940
	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	£36,528

Business name	Flat roof extension cost
AVmen Construction, Greater London, NW3	£21,944
Novo Solutions Group Ltd, London, NW3	£21,944
Open Space London, London, Greater London, NW3	£21,848
Superior Project Ltd, Greater London, NW3	£21,944
Kigumi ltd, London, Nw3	£21,944
Buildview Construction Ltd, Greater London, NW3	£21,944
BUILD SPACE, Primrose Hill, NW3	£21,864
BDCM Design & Build, London, Greater London, NW3	£21,848
Hampstead Design Hub, Londonderry, NW6	£21,944
RY Interior Ltd, London, NW3	£21,944
SLS BUILDERS LIMITED, Kentish Town, NW5	£21,864
EUROBUILD PROPERTIES CO LTD, Kilburn, NW6	£21,856
Mel-Art Ltd, Greater London, NW6	£21,944
Hedi Group, 517 Finchley Road, London, Greater London, NW3	£21,848
Mark Collett Design and Build, 8 St Georges Terrace, Primrose Hill, London, Greater London, NW1	£21,848
NWL Renovations Ltd , London , Nw6	£21,864
ELJHANI BUILDING & PROPERTY MANAGEMENT SERVICES LTD, Newcastle upon Tyne , NE4	£22,400
Eye Construction, Greater London, NW6	£21,944
Capital Projects, London, NW5	£21,944
Capital Projects, Unit 320, Highgate Studios, 53-79 Highgate Road, London, NW5	£21,848
R&Co Property Development Ltd, London, NW8	£21,840
ASE Design & Build Ltd, Kilburn, NW6	£21,888
Adrian Noonan Ltd, London, NW5	£21,888
Forster & Sons, London, Greater London, NW1	£21,848
RAM Build Construction Ltd, 21 Laurier Rd, Highgate, London, Greater London, NW5	£21,848

Extend your NW3 with an extension

Flat roof extension cost in NW3

Estimates for common extension builder jobs in NW3;

Rates for other NW3 trades

Flat roof extension cost in NW3

Get extension builder rates instantly