Cost to build a flat roof extension in W9

Flat roof extension cost in W9

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 W9?

A flat roof extension ranges from the cheapest of £21,848 (ProHome Construction ltd based in W9) to the dearest of £21,944 (Blue based in NW6), 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 W9 by posting a job with HaMuch. We'll send it to extension builders in W9.

Estimates for flat roof extension near W9

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	£17,391
	Build a two storey extension	£87,837
	Build a timber frame extension	£25,891
	Install a swimming pool	£80,891
	Cost to build a single storey extension	£52,824
	Cost to build a side return extension	£40,276
	Install an RSJ	£2,091
	Build an outbuilding	£9,891
	Build a mansard loft conversion	£51,891
	Cost of a loft conversion	£32,730
	Build a kitchen extension	£41,891
	Build a hip to gable loft conversion	£41,891
	Build a granny annexe	£86,891
	Build a garden office	£9,891
	Convert a garage	£15,891
	Build a new garage	£18,391
	Build a flat roof extension	£21,891
	Build a dormer loft conversion	£41,891
	Lay a concrete foundation	£6,141
	Convert a bungalow loft	£28,891
	Basement conversion cost	£36,276

Business name	Flat roof extension cost
Northwest Building Constructions Ltd, Paddington, W2	£21,888
Blue, Greater London, NW6	£21,944
Typhoon Services Ltd, Kilburn, NW6	£21,888
ProHome Construction ltd, Maida Vale, West London, London, Greater London, W9	£21,848
Oscar Builder, Kilburn, NW6	£21,864
Cly Design, Greater London, NW8	£21,944
Hamilton Park Properties, Greater London, W11	£21,944
Inigo & Co., London, Greater London, W11	£21,848
Hamilton Park Properties, London, Greater London, W11	£21,848
Paul Tully Building Contractor, Maida Vale, W9	£21,888
ADAM Carpentry, Greater London, W2	£21,944
CB Design & Architecture, 24 d cambridge avenue, london, Greater London, nw6	£21,848
London Craftmasters LTD, 57, 29 Abercorn Place, Westminster, Greater London, NW8	£21,848
Hisham Al Sawan, Kilburn, NW6	£21,888
Haven Design and Build, Greater London, NW6	£21,944
BPS Building, Kilburn, NW6	£21,888
G-something London, Greater London, W10	£21,944
ScpiPo, Greater London, Nw6	£21,944
Kappa Enterprises Ltd, 24 Evesham House, Hereford Road, London, Greater London, W2	£21,848
Domus Italia - The Italian Contractor, London, W11	£21,944
Domus Italia - The Italian Contractor, 27a Pembridge Villas, Notting Hill, London, W11	£21,848
The Lady Builder, 52 Queen's Gardens, London, Greater London, W2	£21,848
Tiptoe Design & Build, London, Greater London, W10	£21,848
House Of Blake, Greater London, NW6	£21,944
Marijana Debelic - Goldborne Design Ltd, London, Londonderry, W10	£21,848

Extend your W9 with an extension

Flat roof extension cost in W9

Estimates for common extension builder jobs in W9;

Rates for other W9 trades

Flat roof extension cost in W9

Get extension builder rates instantly