Garage to Annexe Conversions in South Wales

A garage-to-annexe conversion creates a fully self-contained living space within your existing footprint — perfect for elderly relatives, adult children or as a granny flat. We handle insulation, plumbing, electrics, kitchenette installation and en-suite bathroom — meeting all Building Regulations. Annexe conversions usually need no planning permission as long as they're ancillary to the main house. Most projects complete in 4–6 weeks.

Benefits

  • Self-Contained Living: Bedroom, en-suite and kitchenette — full independence within your home.
  • Cheaper Than Extending: Significantly less cost and disruption than building a new annexe from scratch.
  • Adds Major Property Value: Multi-generational and granny-annexe-ready homes are increasingly in demand.
  • Full Building Regs Sign-Off: All plumbing, electrics, fire safety and insulation to current standards.
  • Step-Free Access: Ground-floor accessible layout — ideal for ageing or mobility-impaired relatives.
  • Usually No Planning Needed: Ancillary annexes within the existing footprint are normally permitted development.

Our garage to annexe conversions range

  • Granny Annexe Conversion: Bedroom, en-suite wet room and kitchenette — designed for elderly relatives.
  • Teenager / Adult Child Annexe: Self-contained bedsit with privacy from the main house.
  • Holiday Let Garage Annexe: Higher-spec finish with separate entrance for short-term lettings.
  • Double Garage Annexe: Larger annexe with separate lounge, bedroom and full bathroom in a double garage.

Frequently Asked Questions

Do I need planning permission for a garage annexe?

Usually not — provided the annexe stays ancillary to the main house and isn't rented as a separate dwelling. We confirm planning status before quoting.

Can I rent out a converted garage annexe?

Short-term holiday lettings are normally fine; long-term lets often require a change of use application. We'll advise on your specific situation.

How much does a garage annexe conversion cost?

Typically £18,000 to £32,000 depending on whether you need a kitchenette and en-suite. Fixed quotes provided after detailed survey.

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Get a fixed-price quote within 24 hours. Free home survey. 10-year guarantee. Call 02920 860894 or request a callback.