When a garage conversion is permitted development
Converting an attached or integral garage into living space is normally classed as permitted development, which means you don't need to apply for planning permission, provided that:
- The work is internal or doesn't enlarge the building — replacing the garage door with a wall and window is fine.
- The new wall, window and any external changes use materials that look similar to the existing house.
- Your home's permitted development rights haven't been removed.
- The garage is being used as part of your home (not as a separate dwelling).
Most of the semi-detached and detached homes we convert across Greater Manchester, Lancashire and Cheshire fall into this category. You can apply to the council for a Lawful Development Certificate to confirm it in writing — useful when you sell — and we can arrange this for you.
When you do need planning permission
- Permitted development rights have been removed. This is very common on newer estates (roughly the last 20–25 years), where the original planning permission included a condition requiring garages to be kept for parking. Check your deeds or the original planning decision — or let us check the council's planning portal for you.
- Listed buildings always need listed building consent for alterations.
- Conservation areas and Article 4 directions can restrict external changes, particularly to the front of the house.
- Flats and maisonettes don't have the same permitted development rights as houses.
- Detached garages converted into sleeping accommodation, or any garage converted into a self-contained annexe with its own kitchen, bathroom and entrance, may be treated as a change of use or a new dwelling.
- Changes to the building's size or height — raising the roof, extending the footprint, adding a dormer.
- Business use where clients or customers visit regularly, or where the use would affect neighbours.
- Loss of parking in areas where the council has a policy of protecting off-street parking (some town centres and high-density estates).
How we handle planning for you
- At the free survey we check the council's planning history for your address and look for any conditions removing permitted development rights.
- If the conversion is permitted development, we tell you so — and can apply for a Lawful Development Certificate if you'd like written confirmation.
- If an application is needed, we prepare the drawings, submit the householder application and deal with the planning officer. Most decisions take around eight weeks.
- Building Regulations approval is separate from planning and is always required — read our guide.
Local councils we work with
We deal regularly with the planning and Building Control departments at Manchester, Salford, Trafford, Stockport, Tameside, Oldham, Rochdale, Bury, Bolton, Wigan, Warrington, Cheshire East, Blackburn with Darwen, Chorley, South Ribble and Preston councils, so we know how each one approaches garage conversions and what they expect to see.
Don't skip this step. A conversion built without the permission it needed can be enforced against, is a headache when you sell, and may not be covered by your buildings insurance. Ten minutes of checking at the survey stage saves all of that.