Cost to build a flat roof extension in Mill Hill

Flat roof extension cost in Mill Hill

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 Mill Hill?

A flat roof extension ranges from the cheapest of £21,200 (DBR Construction Ltd based in NW7) to the dearest of £22,800 (Greenbuild maintenance sevices ltd based in NW4), 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 Mill Hill by posting a job with HaMuch. We'll send it to extension builders in Mill Hill.

Estimates for flat roof extension near Mill Hill

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
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What insulation do I need for a flat roof extension?

	Job	Estimate
	Underpinning a house	£17,358
	Build a two storey extension	£87,786
	Build a timber frame extension	£25,858
	Install a swimming pool	£80,858
	Cost to build a single storey extension	£52,152
	Cost to build a side return extension	£39,898
	Install an RSJ	£2,058
	Build an outbuilding	£9,858
	Build a mansard loft conversion	£51,858
	Cost of a loft conversion	£32,415
	Build a kitchen extension	£41,858
	Build a hip to gable loft conversion	£41,858
	Build a granny annexe	£86,858
	Build a garden office	£9,858
	Convert a garage	£15,858
	Build a new garage	£18,358
	Build a flat roof extension	£21,858
	Build a dormer loft conversion	£41,858
	Lay a concrete foundation	£6,108
	Convert a bungalow loft	£28,858
	Basement conversion cost	£35,898

Business name	Flat roof extension cost
RAS Construction & Design Ltd, Hertfordshire, NW7	£21,960
Ask Windows Limited, 145A The Broadway, Mill Hill, London, Gr, NW7	£21,832
MH Costa Construction Ltd, 9 Mill Hill Industrial Estate, Flower Lane, London, Greater London, NW7	£21,856
DBR Construction Ltd, London, NW7	£21,200
NW London Contracts Ltd, Greater London, NW7	£21,960
Simion PC Construction Ltd, Edgware , HA8	£21,440
F C Builders London ltd, Edgware, HA8	£21,600
Coldshield ltd, Greater London, NW7	£21,960
Nisup Building Services, Edgware, HA8	£21,600
Alex Interiors Ltd, London, HA8	£21,952
CORTESE CONSTRUCTION, Greater London, NW7	£21,960
Lifestyle D.sign, 374 Watford way,, London, Greater London, NW4	£21,848
Arhiterra Design and Build Ltd, Greater London, NW9	£21,944
A & S Construction Ltd, LONDON, NW9	£21,600
SL Building Constructions, Greater London, NW9	£21,944
TCTServ Ltd, 42 Deans Lane, Edgware, Greater London, HA8	£21,848
Crest Construction and Interiors Ltd, Edgware, HA8	£21,888
AAA Team Building Services Ltd, London, NW9	£21,848
L H Builders, Edgware, HA8	£21,864
Otters Group Ltd, London, NW9	£21,848
Saha Properties Ltd, Greater London, NW4	£21,944
Carl Construction Limited, London, NW9	£21,944
RM GRAND BUILDERS LTD, Lynford Gardens Edgware, London, HA8	£21,848
Greenbuild maintenance sevices ltd, London, NW4	£22,800
Rapid Response Contractors Ltd, Greater London, HA8	£21,952

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Flat roof extension cost in Mill Hill

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Flat roof extension cost in Mill Hill

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