Cost to build a flat roof extension in NW1

Extend your NW1 with an extension

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 NW1?

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Flat roof extension cost in NW1
Build a flat roof extension cost in NW1
Estimates for common extension builder jobs in NW1;

Flat roof extension cost in NW1

A flat roof extension ranges from the cheapest of £21,848 (NWL BUILDERS LTD based in W1T) 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 NW1 by posting a job with HaMuch. We'll send it to extension builders in NW1.

Estimates for build a flat roof extension near NW1

Estimates for common extension builder jobs in NW1;

Rates for other NW1 trades

Build a flat roof extension cost in NW1

Estimate Build a flat roof extension cost in NW1 based on hourly/daily rate (excluding VAT or callout charges)
Business name	Build a flat roof extension cost
Masters Construction UK, London, NW1	£22,000
KRIER DESIGN, Greater London, NW1	£21,944
McCracken Consult & Construct, Greater London, NW1	£21,944
UR Interior, Greater London, NW1	£21,944
NWL BUILDERS LTD, 4th Floor, Silverstream House, 45 Fitzroy Street, Fitzrovia, London, Greater London, W1T	£21,848
Square Foot Basements Ltd, London, Greater London, NW1	£21,848
plansing, london, W1W	£21,888
Simone Pinducciu - Mesoni Ltd, Greater London, W1W	£21,944
NARCH Ltd, Greater London, WC1H	£21,944
Forster & Sons, London, Greater London, NW1	£21,848
ELJHANI BUILDING & PROPERTY MANAGEMENT SERVICES LTD, Newcastle upon Tyne , NE4	£22,400
Mark Collett Design and Build, 8 St Georges Terrace, Primrose Hill, London, Greater London, NW1	£21,848
Citygate, London, WC1H	£21,944
Atlant Construction, London, Greater London, W1T	£21,848
KBB Master Builder LTD, Greater London, W1W	£21,944
JK Doors, Fitzrovia, W1W	£21,888
UCS UK Ltd, Greater London, W1W	£21,944
Eternal Solutions, Greater London, W1W	£21,944
KBB Master Builder Ltd, Greater London, W1W	£21,944
JAY Executinos LTD, London, W1W	£21,944
Teammax LTD, 85 Great Portland Street, London, Greater London, W1W	£21,848
Grand Phase Ltd, 85 Great Portland Street, London, Greater London, W1W	£21,848
Capatus properties ltd, Greater London, W1W	£21,944
Italian Soft Leather Purses, Greater London, W1W	£21,944
Design 2000 UK Ltd, Greater London, W1W	£21,944

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	Job	Estimate
	Cost to underpin a house	£17,433
	Build a two storey extension	£87,900
	Cost to build a timber frame extension	£25,933
	Cost to build a swimming pool	£80,933
	Cost to build a single storey extension	£53,662
	Cost to build a side return extension	£40,748
	Cost to Install an RSJ	£2,133
	Build an outbuilding	£9,933
	Cost to build a mansard loft conversion	£51,933
	Cost of a loft conversion	£33,123
	Cost to build a kitchen extension	£41,933
	Build a hip to gable loft conversion	£41,933
	Build a granny annexe	£86,933
	Build a garden office	£9,933
	Cost of a garage conversion	£15,933
	Build a new garage	£18,433
	Cost to build a flat roof extension	£21,933
	Cost to build a dormer loft conversion	£41,933
	Lay a concrete foundation	£6,183
	Cost of a bungalow loft conversion	£28,933
	Basement conversion cost	£36,748