2026 Garage Conversion Costs in Kent
Single Garage → Habitable Room
Insulation, plastering, electrics, new external wall with window, flooring.
Garage → Bedroom + En-Suite
Adds full plumbing, WC, shower, waste run, tiled wet area.
Double Garage → Open-Plan Annexe
Kitchenette, living area, separate entrance, upgraded heating and glazing.
Prices are indicative 2026 ranges for standard properties in Kent. Every job is quoted individually after a site visit — no surprise costs mid-build.
What's Included in Every Conversion
Planning Permission — The Honest Answer
Most integral or attached garage conversions in Kent do not need planning permission because the work is internal and the outside of the building is largely unchanged. Swapping the garage door for a window and cavity wall in brick that matches the house is normally treated as permitted development.
Planning permission is normally required when the property is listed, in a conservation area, was built under a planning condition that removed permitted development rights (common on newer estates in Kings Hill, Kings Hill and parts of Ashford), or when the conversion creates a separate dwelling.
Building Regulations approval is always required. This covers structural loading, insulation values, ventilation, fire escape and electrical safety. We handle the full Building Control application and see every inspection through to a signed completion certificate.