Do I Need Planning Permission for a Garage Door?

• Like-for-like replacement: permitted development — no planning permission
• Changing type or adding electric operation: still PD on a standard house
• Listed building: usually needs Listed Building Consent
• Article 4 direction / some conservation areas: permission may be required for a front-facing door
• Widening or forming a new opening: likely needs planning and Building Regulations (structural)
• Converting the garage to a room: the conversion — not just the door — is what may need planning

In short: swapping a garage door is almost always fine to just get on with. Pause only if your home is listed or under an Article 4 direction, or if you're changing the size of the opening or converting the garage — those bring planning and/or Building Regulations into play.

Simply replacing a garage door is permitted development. What changes the picture is converting the garage into a habitable room — where the door is removed and the opening infilled with a wall and window. The infill itself is often permitted development, but two things commonly bring in planning: an Article 4 direction (which many estates and conservation areas have, specifically to control the loss of garages and front parking), or a planning condition on the original house that removed PD rights.

Even where planning isn't needed, a garage conversion always needs Building Regulations approval — for insulation, damp-proofing, structural support over the old opening, ventilation and fire safety. Check both before you start.