Cost to build a flat roof extension in Northwood

Flat roof extension cost in Northwood

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 Northwood?

A flat roof extension ranges from the cheapest of £20,040 (Adams Build and Design LTD. based in Ha6) to the dearest of £24,000 (Design & Build Builders Ltd based in WD18), 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 Northwood by posting a job with HaMuch. We'll send it to extension builders in Northwood.

Estimates for flat roof extension near Northwood

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?
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What insulation do I need for a flat roof extension?

	Job	Estimate
	Underpinning a house	£17,418
	Build a two storey extension	£87,878
	Build a timber frame extension	£25,918
	Install a swimming pool	£80,918
	Cost to build a single storey extension	£53,368
	Cost to build a side return extension	£40,582
	Install an RSJ	£2,118
	Build an outbuilding	£9,918
	Build a mansard loft conversion	£51,918
	Cost of a loft conversion	£32,985
	Build a kitchen extension	£41,918
	Build a hip to gable loft conversion	£41,918
	Build a granny annexe	£86,918
	Build a garden office	£9,918
	Convert a garage	£15,918
	Build a new garage	£18,418
	Build a flat roof extension	£21,918
	Build a dormer loft conversion	£41,918
	Lay a concrete foundation	£6,168
	Convert a bungalow loft	£28,918
	Basement conversion cost	£36,582

Business name	Flat roof extension cost
Daniel London, London, Greater London, HA6	£21,872
Adams Build and Design LTD., Greater London, Ha6	£20,040
Coste + Beno Ltd, Greater London, HA6	£21,968
Coste + Beno Ltd, 20 Leaf Close,, Northwood,, London, Greater London, HA6	£21,864
Project Squared Construction Ltd, Hertfordshire, ha6	£21,968
S2M VENTURES LLP, West Lothian, HA6	£21,968
J B S Development & Construction Ltd, Pinner, HA5	£21,888
Excelsior Construction Ltd, Pinner, HA5	£21,888
AV Home Improvements, Herts, WD19	£21,968
RMB Building and Development Ltd, 1 Egerton Close, Pinner, Middlesex, HA5	£21,856
Sharp Building Ltd, Watford, WD19	£21,896
Ideal Place Construction Ltd, Watford, WD19	£22,000
C S C BUILDINGS LTD, Oxhey, WD19	£21,888
GRAPHENE, London, Greater London, HA5	£21,856
Cannon Build Solutions, Hartsbourne House, Watford, Hertfordshire, WD19	£21,872
G.L. Campbell Builders LTD, 18 Colchester Drive, Pinner, Middlesex, HA5	£21,856
Building Service and Support Ltd, Pinner, HA5	£21,880
Design & Build Builders Ltd, Watford, WD18	£24,000
Frame Brickwork, West Watford, WD18	£21,896
Oldfield Construction, London, Greater London, Ha4	£21,856
Architectural Brickwork Services, Hertfordshire, WD19	£21,968
Harrow Roofing and Building Limited, Middlesex, HA5	£21,952
none, Lancashire, HA5	£21,944
The Property Planner, Greater London, HA4	£21,952
DeHavilland Design & Build Limited, Middlesex, Greater London, HA4	£21,864

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Flat roof extension cost in Northwood

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Flat roof extension cost in Northwood

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