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Build cost 
estimates
for residential 
projects

When planning your home extension or renovation,
the first question on everyone’s mind is,
how much is it going to cost?

To give you a better understanding, here are some average build prices represent mid-range specifications for a typical 3-bedroom semi-detached property. Please keep in mind that actual costs may vary depending on your specific property and design requirements.
Side
extension
£65,000
rearextension
Rear
extension
£75,000
side return extension
Side return
extension
£95,000
wrap around
Wrap around
extension
£155,000
2 story
Two storey
side extension
£150,000
2 storey rear
Two storey
rear extension
£150,000
hip to gable
Hip to gable
loft conversion
£80,000
loft
Loft
dormer
£50,000
velux
Velux
windows
£35,000
l shape
L-shaped
dormer
£60,000
mansard
Mansard
loft
£80,000
upward
Upward
extension
£120,000
garage
Garage
conversion
£25,000
internal
Internal
reconfigurations
£15,000
garden
Garden
outbuilding
£30,000
Please note: These prices are strictly estimates for educational purposes only and are based on mid-range specifications. Final costs will depend on several factors such as your property’s existing condition, new proposed design, your chosen materials and finishes etc.

Get a tailored build quote

If you already have architectural plans and are ready to take the next step, we can connect you with trusted builders to get an accurate quote for your project.

Receive a personalised quote from one of our approved contractors.
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