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Flat roof extension cost in SY21

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 SY21?

A flat roof extension ranges from the cheapest of £21,280 (SDW CONSTRUCTION LTD based in SY15) to the dearest of £21,688 (Your Home Made Ltd based in SY11), 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 SY21 by posting a job with HaMuch. We'll send it to extension builders in SY21.

Estimates for flat roof extension near SY21

Estimates for common extension builder jobs in SY21;

JobEstimate
Underpinning a house£16,970
Build a two storey extension£87,205
Build a timber frame extension£25,470
Install a swimming pool£80,470
Cost to build a single storey extension£44,404
Cost to build a side return extension£35,540
Install an RSJ£1,670
Build an outbuilding£9,470
Build a mansard loft conversion£51,470
Cost of a loft conversion£28,783
Build a kitchen extension£41,470
Build a hip to gable loft conversion£41,470
Build a granny annexe£86,470
Build a garden office£9,470
Convert a garage£15,470
Build a new garage£17,970
Build a flat roof extension£21,470
Build a dormer loft conversion£41,470
Lay a concrete foundation£5,720
Convert a bungalow loft£28,470
Basement conversion cost£31,540
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Rates for other SY21 trades

Appliance Repair Specialist
Bathroom Fitter
Builder
Carpenter and Joiner
Cleaner
Conservatory Specialist
Door Fitter
Drain Specialist
Driveway Specialist
Electrician
Extension Builder
Fencer
Fire and Security Specialist
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Gardener
Handyman
Heating Engineer
Kitchen Fitter
Landscaper
Painter and Decorator
Patio and Path Specialist
Plasterer
Plumber
Removals and Storage
Roofer
Tiler
Window Fitter
Flat roof extension cost in SY21
Estimate Flat roof extension cost in SY21 based on hourly/daily rate (excluding VAT or callout charges)
Business name Flat roof extension cost
SDW CONSTRUCTION LTD, Montgomery, SY15 £21,280
John Sillitoe Building Contractor, Llanllwchaiarn, SY16 £21,344
Richard Sherratt Builders Ltd, Shrewsbury , SY5 £21,280
EVABUILD LIMITED, Llanllwchaiarn, SY16 £21,360
J S CONSTRUCTION, Oswestry Rural, SY10 £21,584
Kevin Davies Building Contractors, Oswestry , SY10 £21,520
Your Home Made Ltd, Shropshire, SY11 £21,688
OPH Joinery, Shrewsbury, SY1 £21,608
Fistral ltd, Unit F4, Plot 2, Bank Top Ind Est, St Martin?s, SY10 £21,568

Get extension builder rates instantly

Get extension builder rates instantly (excluding VAT or callout charges)
Location in UKHourly RateDaily Rate
Flat Roof Extension near Shrewsbury£24£192
Flat Roof Extension near The Wrekin£24£196
Flat Roof Extension near Wrexham Maelor£28£217
Flat Roof Extension near Wrexham£29£220
Flat Roof Extension near Telford£25£197