If you need more living space, both garage conversions and extensions can deliver. But which is right for you? Here's an honest comparison to help you decide.
Garage Conversion: The Basics
Typical cost: £15,000 - £25,000
Timescale: 3-4 weeks
Planning permission: Usually not required
A garage conversion transforms an existing structure into living space. The walls and roof are already there - you're adding insulation, flooring, windows, electrics, and heating.
Extension: The Basics
Typical cost: £35,000 - £60,000 (single storey)
Timescale: 8-12 weeks
Planning permission: Often not required under permitted development
An extension is built from scratch, typically at the rear of the house. It requires foundations, walls, roof, and all services to be installed from new.
When Garage Conversion Makes Sense
Budget is tight: Garage conversions cost roughly half what an extension costs for similar floor space.
Speed matters: You can have usable space in a month rather than three.
You don't use your garage: Be honest - is it full of junk rather than cars? Converting unused space makes sense.
Garden space is precious: A garage conversion doesn't touch your outdoor space.
The garage is attached: Attached garages are easier and cheaper to convert than detached ones.
When Extension Makes Sense
You need your garage: For parking, storage, or a workshop - don't convert space you actually use.
You want to transform the house: Extensions can create open-plan living spaces that completely change how your home works.
Maximum space is the goal: Extensions can be larger than garages and are easier to integrate with existing rooms.
Future value matters: Extensions typically add more to property value than garage conversions, especially if they create a larger kitchen-diner.
Potential Issues
Garage conversions: May reduce property value in areas where parking is premium. Some garages have damp issues or poor foundations that need addressing. Results can feel like converted garages if not done well.
Extensions: Higher cost and longer disruption. May require planning permission for larger builds. Reduces garden space.
What About Both?
Some homeowners do both - converting the garage and building an extension that links everything together. This can create substantial additional space and works particularly well on properties where the garage adjoins the kitchen.
The Local Picture
In areas like Bromley, Orpington and Sevenoaks where parking matters, think carefully before losing garage space. In Tonbridge or Maidstone where most properties have driveways, it's less of a concern. We can advise on what works best for your specific situation and location.
Need Help Deciding?
We build both garage conversions and extensions across Kent, Sussex and South London. Call 01732 905968 and we'll discuss which makes most sense for your home.