Cost to build a flat roof extension in N21

Extend your N21 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 N21?

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Flat roof extension cost in N21
Build a flat roof extension cost in N21
Estimates for common extension builder jobs in N21;

Flat roof extension cost in N21

A flat roof extension ranges from the cheapest of £21,656 (Acacia Gardens Ltd based in N13) to the dearest of £21,944 (C. Jenkin Builders Limited based in N21), 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 N21 by posting a job with HaMuch. We'll send it to extension builders in N21.

Estimates for build a flat roof extension near N21

Estimates for common extension builder jobs in N21;

Rates for other N21 trades

Build a flat roof extension cost in N21

Estimate Build a flat roof extension cost in N21 based on hourly/daily rate (excluding VAT or callout charges)
Business name	Build a flat roof extension cost
S E H BUILDERS LTD, Winchmore Hill, N21	£21,864
Cityscape Projects Ltd, 4 Elm Park Road, London, N21	£21,840
MULBERRY CONSTRUCTION LTD, Winchmore Hill, N21	£21,864
C. Jenkin Builders Limited, 39 The Spinney, Winchmore Hill, Enfield,, N21	£21,944
CESV Ltd, London, N13	£21,944
PonariBuilders Ltd, Greater London, n13	£21,944
Noel’s Design, Greater London, N13	£21,944
Euro Quant Ltd, Palmers Green, N13	£21,888
Acacia Gardens Ltd, Groundfloor, 483 Greenlanes, London, Gre, N13	£21,656
Des Contract Ltd, Southgate, London, Greater London, N14	£21,848
Multiarch Building Services Ltd, London, N13	£21,832
EVS ARCHITECTURE & CONSTRUCTION LTD, London, N14	£21,944
Bzone Builders, Botany Bay, EN2	£21,888
M & A Builders Ltd, Palmers Green, N13	£21,888
Grand Lion Group, London, N14	£21,944
AL Plumbing & Electrical, Enfield, EN1	£21,944
Tdb onsite, Enfield, EN1	£21,888
B&B London Construction Ltd, Enfield, EN1	£21,888
Artifex Building & Carpentry Limited, Southgate, N14	£21,944
The Orchid Group, 4 Chase Side, enfield, EN2	£21,848
Drutu Building Services, Enfield, EN1	£21,856
TIPS CONSTRUCTION, London, Hertfordshire, N14	£21,840
Hassco Building Ltd, London, Greater London, N14	£21,848
Hassco Building Ltd, Greater London, N14	£21,944
Firtree Building Services Ltd, 36 Fir Tree Walk, Enfield, London, EN1	£21,832

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	Job	Estimate
	Cost to underpin a house	£17,383
	Build a two storey extension	£87,824
	Cost to build a timber frame extension	£25,883
	Cost to build a swimming pool	£80,883
	Cost to build a single storey extension	£52,651
	Cost to build a side return extension	£40,179
	Cost to Install an RSJ	£2,083
	Build an outbuilding	£9,883
	Cost to build a mansard loft conversion	£51,883
	Cost of a loft conversion	£32,649
	Cost to build a kitchen extension	£41,883
	Build a hip to gable loft conversion	£41,883
	Build a granny annexe	£86,883
	Build a garden office	£9,883
	Cost of a garage conversion	£15,883
	Build a new garage	£18,383
	Cost to build a flat roof extension	£21,883
	Cost to build a dormer loft conversion	£41,883
	Lay a concrete foundation	£6,133
	Cost of a bungalow loft conversion	£28,883
	Basement conversion cost	£36,179