Interactive calculator with real prices adjusted by UK region. Select your scope, pick your region, get your instant estimate.
1. Choose Scope of Work
2. Select Your Region
What Affects the Cost?
Garage size
Insulation requirements
Damp proofing
Window and door installation
Flooring
Heating
Plumbing (if adding bathroom)
Building regulations
Frequently Asked Questions
How much does a garage conversion cost UK?
A basic single garage conversion costs £6,000-£12,000. A full conversion with en-suite bathroom costs £12,000-£20,000. A double garage conversion costs £15,000-£25,000.
Do I need planning permission for a garage conversion?
Usually no, as garage conversions are internal alterations. However, if you change the external appearance significantly, are in a conservation area, or the property is listed, you may need planning permission.
Does a garage conversion add value?
A garage conversion typically adds 10-15% to property value. On a £250,000 home, that is £25,000-£37,500 — usually far more than the conversion cost.