On paper, it was never a parking space
Here is the local quirk that surprises people. Milton Keynes City Council adopted its current Parking Standards in January 2023, and paragraph 4.4 of that document reads, in full, "Garages do not count as parking spaces." When planners count the spaces a new house needs, the garage is left out of the sum.
So converting yours rarely takes away anything the planners were relying on. What the same document does care about is the length of that drive. A space in front of a garage has to be at least 6 metres long so a car can sit there without hanging over the footway, and a standard bay is 5 metres by 2.5. If your drive is shorter than a family car, think now about where it will go.
If you fancy a carport alongside instead, the standards say it must be open on two sides and at least 3 by 5 metres inside. And find the bikes a new home, a shed or store, before the builders arrive.
Ten ways to use it, ordered for MK houses
Integral. If the garage sits under the main roof, the roof and three walls are already there. The wall it shares with the hall or kitchen is one of the parts building control will want to see detailed.
Single. The new wall where the door was may need its own footing. Parts of the city sit on Oxford Clay, so expect building control to ask how deep it goes.
Read our full guide: Single Garage Conversion: What Is Involved and What to Budget For →
Double. Convert one bay and keep the other, though the kept bay won't count as a space either.
Bedroom. A bedroom needs daylight and a safe way out in a fire. If you live by the Great Ouse or the Ouzel in Newport Pagnell, Bletchley or Stony Stratford, a garage floor is the lowest in the house, so look at the flood map before choosing it for sleeping.
Home office. Suits anyone who splits the week between home and the train to Euston. A desk by the new front window also keeps work out of the bedrooms.
Utility or playroom. A good answer where the kitchen is tight and the washing machine has already moved into the garage. A playroom is a habitable room, so it gets the same insulation and ventilation as any other.
Gym or studio. Fine in a garage that stands on its own. On a terrace or link-detached row, dropped weights carry, so put acoustic lining and a decent floor in the budget.
Detached. Kept as a gym or study the household uses, it normally stays part of the house. Make it somewhere a person lives independently and the Planning Portal says you need planning permission.
Planning and approval. Inside work usually needs no planning application. Building regulations approval usually does, and it is a separate decision.
Cost. We don't publish MK prices. A deeper footing on clay, a wall to the house that needs upgrading or a drive that needs lengthening are what move a quote here, so ask three firms to price one drawing.
The estate's original permission
Much of the city went up in phases, each under its own planning consent. The council's own guidance warns that householder rights may have been withdrawn by a condition on an earlier permission. The Planning Portal goes further and names garage conversions as one of the things such conditions sometimes catch, especially on new developments.
So two neighbours in different grid squares can get different answers. Ask the council for the decision notice that covers your street and read the conditions. If one says the garage must be kept for parking, you need a planning application. If nothing does but you want it in writing, a lawful development certificate is the formal answer.
Building control is the council's own team at the Civic. Its charges table has a line of its own for converting a garage into habitable rooms, with separate columns for full plans and a building notice. Get approval in place before the door comes out, because putting it right afterwards means a regularisation application.
Old fronts in Newport Pagnell, Wolverton and Olney
Swapping a garage door for a window rarely bothers anyone, except in the Wolverton and Olney conservation areas. Wolverton's Article 4 direction removes rights for alterations to any elevation facing a road, side walls on corner plots included, and Olney's covers any alteration at all. If your garage faces the street in either, plan on an application.
Newport Pagnell has no direction of its own, but its 2010 conservation area review shows where officers stand. It calls the loss of front gardens to hard standing on Mill Street a regrettable change, and says plastic windows and doors rarely if ever reproduce the look of timber. If the new window will sit in a row of older houses, we would use painted timber made to match theirs, and keep the front boundary.
One last check for any new living room on a slab. Look up your address on the UKradon map. Where radon is raised, building control may ask for protection under the new floor.
Where these facts come from
- Milton Keynes City Council: Parking Standards SPD (2023)
- Milton Keynes City Council: Parking Standards SPD page
- Milton Keynes City Council: do I need planning permission?
- Milton Keynes City Council: lawful development certificates
- Milton Keynes City Council: building regulation charges
- Milton Keynes City Council: building control
- Milton Keynes City Council: Article 4 directions
- Newport Pagnell Conservation Area Review (2010)
- Milton Keynes Level 1 Strategic Flood Risk Assessment (2024)
- Planning Portal: garage conversion planning permission
- Planning Portal: building regulations for a garage conversion
- Planning Portal: detached garage as self-contained living space
- LABC: do I need to consider radon?
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Questions people in Milton Keynes ask
We're on a newer estate in Brooklands. Will the council say we've lost a parking space?
Not under its current standards, because they say garages do not count as parking spaces in the first place. The thing to check is whether your estate's permission carries a condition about the garage. If it does, you still need to apply.
Our drive is only about 5 metres long. Is that a problem?
It can be. The council expects a space in front of a garage to be at least 6 metres so cars don't overhang the footway. A shorter drive with no garage door behind it is less of an issue, but measure your own car before you decide.
Can my teenager live in our detached garage in Woburn Sands as a separate flat?
Not without planning permission. Once it works as somewhere to live independently, the Planning Portal treats it as a change of use.
We're in Wolverton. Can we fill in the garage door at the side of our corner house?
Probably not without permission. The Wolverton Article 4 direction covers road-facing elevations, and on a corner plot that includes the side wall. Ask the council's planning team before you order windows.