Is Planning Permission Needed for a Garage Conversion

Article Summary:
Most garage conversions fall under Permitted Development, meaning planning permission is not required—unless you’re creating a new dwelling or altering the building footprint. Find out more…

Many homeowners now prefer improving their existing property over moving. Whether to create extra living space or boost resale value, understanding the planning rules—especially for garage conversions—is essential.

Is Planning Permission Needed for a Garage Conversion?

Most garage conversions don’t need planning permission—but building regulations always apply.

Garage conversions are increasingly popular as homeowners use the space for offices, gyms, studios, or extra bedrooms. For typical houses, converting a garage into a habitable room does not require planning permission, provided the work stays internal and doesn’t enlarge the building.

However, if you plan to convert the garage into an independent dwelling, you will need full planning permission. Flats, maisonettes and buildings created under change-of-use rules also fall outside standard permitted development.

Building Regulations Still Apply

Even when planning permission isn’t required, a garage conversion must comply with building regulations—covering insulation, ventilation, structural work, fire safety and moisture resistance. These ensure the finished room meets modern habitable standards.

Is Planning Permission Needed to Extend a Garage?

Extending a garage is more complex than simply converting one. Many garage extensions are still possible under permitted development, provided they meet the following criteria:

No more than 50% of the garden/plot is covered with outbuildings
Not forward of the principal elevation (the house front)
No part of the garage is higher than the house roof
Maximum height of 4m (or 3m if within 2m of a boundary)

Always check specific local rules, as conservation areas or Article 4 directions may remove permitted development rights.

Is Planning Permission Needed to Build a New Garage?

A new self build garage can often be built without planning permission, provided:

It is not designed as a living space (no beds or full-time accommodation)
It is under 15m² if freestanding
Under 30m² if attached to the house
Meets distance requirements from boundaries and other structures

Local authorities can confirm whether PD rights apply to your property, ensuring your garage project stays compliant.

Garage Conversion Planning – At a Glance

Topic	Summary
Convert Existing Garage	No planning permission needed if building isn’t enlarged
Create New Dwelling	Full planning permission required
Extend a Garage	Permitted if size and height limits are met
Build New Garage	Often possible without permission under strict size rules

Last updated: 26 November 2025

Need advice on garage conversions or planning rules?

Our team can guide you through the regulations for conversions, extensions or new oak-framed garages.

Contact the Trade Oak team