Cost to build a flat roof extension in NW5

Flat roof extension cost in NW5

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 NW5?

A flat roof extension ranges from the cheapest of £21,848 (Capital Projects based in NW5) 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 NW5 by posting a job with HaMuch. We'll send it to extension builders in NW5.

Estimates for flat roof extension near NW5

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	£17,415
	Build a two storey extension	£87,872
	Build a timber frame extension	£25,915
	Install a swimming pool	£80,915
	Cost to build a single storey extension	£53,298
	Cost to build a side return extension	£40,542
	Install an RSJ	£2,115
	Build an outbuilding	£9,915
	Build a mansard loft conversion	£51,915
	Cost of a loft conversion	£32,952
	Build a kitchen extension	£41,915
	Build a hip to gable loft conversion	£41,915
	Build a granny annexe	£86,915
	Build a garden office	£9,915
	Convert a garage	£15,915
	Build a new garage	£18,415
	Build a flat roof extension	£21,915
	Build a dormer loft conversion	£41,915
	Lay a concrete foundation	£6,165
	Convert a bungalow loft	£28,915
	Basement conversion cost	£36,542

Business name	Flat roof extension cost
Capital Projects, Unit 320, Highgate Studios, 53-79 Highgate Road, London, NW5	£21,848
Capital Projects, London, NW5	£21,944
JAMES REGAN CONSTRUCTION, Kentish Town, NW5	£21,864
RAM Build Construction Ltd, 21 Laurier Rd, Highgate, London, Greater London, NW5	£21,848
Forster & Sons, London, Greater London, NW1	£21,848
SLS BUILDERS LIMITED, Kentish Town, NW5	£21,864
Adrian Noonan Ltd, London, NW5	£21,888
Square Foot Basements Ltd, London, Greater London, NW1	£21,848
D.W Baker, Holloway, N7	£21,888
Avocado Sweets Design Studio, Studio 37, Bickerton House, 25-27 Bickerton Road, London, Greater London, N19	£21,848
Novo Solutions Group Ltd, London, NW3	£21,944
Hudson Builders & Bathrooms, London, N7	£21,944
Warren House Construction Ltd, 74 Shaftesbury Road, London, Greater London, N19	£21,848
BUILD SPACE, Primrose Hill, NW3	£21,864
AVmen Construction, Greater London, NW3	£21,944
ELJHANI BUILDING & PROPERTY MANAGEMENT SERVICES LTD, Newcastle upon Tyne , NE4	£22,400
KRIER DESIGN, Greater London, NW1	£21,944
McCracken Consult & Construct, Greater London, NW1	£21,944
UR Interior, Greater London, NW1	£21,944
Mark Collett Design and Build, 8 St Georges Terrace, Primrose Hill, London, Greater London, NW1	£21,848
Andreas Thomas Demetri, Holloway, N7	£21,888
ARCHWAY DESIGN+BUILD LTD, Archway, N19	£21,864
Masters Construction UK, London, NW1	£22,000
Bok Services Ltd, Greater London, N7	£21,944
Supreme Home Improvements London, London, n19	£21,864

Extend your NW5 with an extension

Flat roof extension cost in NW5

Estimates for common extension builder jobs in NW5;

Rates for other NW5 trades

Flat roof extension cost in NW5

Get extension builder rates instantly