Five square metres of front garden
Brick up a garage door and the car has to live somewhere. Usually that means the front garden, and the city council's highways page has two rules people trip over.
First, the surface. Paving more than five square metres between the house and the road needs planning permission unless it is built to the government's permeable surfacing guidance, which the council links to.
Second, the kerb. If your house sits on a classified road (any A, B or C road) the council wants a planning application for a new vehicle crossing before anything is dug. The crossing itself is built by the council or by an accredited contractor.
And the garage itself? Internal work that doesn't enlarge the house usually needs no planning permission. The catch is a condition. Derby's planning constraints page warns that householder rights can be taken away by condition when an estate is approved, so ask the council for your house's original decision notice and read the conditions at the end. Where an application is needed, the saved 2006 local plan counts car parking among the amenity points officers weigh.
Choosing what the garage becomes
Ordered roughly by how often they suit Derby houses. Each links to a full guide.
Single garage. The usual case beside a suburban semi. The new wall under the window may need its own footing, and that is the first thing a builder should check when the door comes out.
Read our full guide: Single Garage Conversion: What Is Involved and What to Budget For →
Integral. Built into the house, so the new room already shares a wall and often a ceiling with it. The old floor level and the door through from the hall are where the snags tend to be.
Home office. Stays in household use, so planning rarely comes into it. Run data cable in before the walls are lined.
Bedroom. Building control will look hard at the escape route and ventilation. In parts of the inner wards, adding bedrooms for lodgers can turn into a planning question too (see below).
Utility or playroom. Converting the back half and keeping a store behind the old door avoids a new front wall altogether, handy on a scheduled house in Mickleover village.
Double garage. One bay converted and one kept for the car leaves the drive alone, which matters where a new crossing would need an application.
Detached garage. Fine as a gym, workshop or study while it stays in domestic use with the house. Turn it into a separate home, whoever lives there, and the Planning Portal says permission may be needed whatever the work.
Gym or studio. Where the garage backs onto next door's, insulate the shared wall against sound before the weights go in.
Planning and building control. Two separate checks. Planning depends on your house's conditions and any Article 4 direction; Building Regulations approval is needed for almost any habitable room and comes through the Derbyshire partnership.
Cost and value. No figures here. The footing and any new kerb or hardstanding at the front move a Derby quote more than the finishes do.
Mickleover village and the street-facing directions
A garage door is a door. That sounds obvious, but it is why some Derby conversions need an application when the same job a mile away does not.
Mickleover's 1992 Article 4 direction lists individual houses on The Green, The Square, Etwall Road, Orchard Street and a few neighbouring streets. For those houses it removes the right to alter doors, windows and roof materials, and to paint or render brickwork facing the road. Swap a garage door for a window and wall there and you need permission first.
The council's summary puts nine other conservation areas under the same street-facing control, Spondon, Allestree and Darley Abbey among them. Arboretum, Hartington Street and Strutts Park add front walls and gates, so knocking out a boundary wall for a new parking space is caught there as well. Some directions list particular houses rather than whole areas, so check whether yours is included.
Extra rooms inside the ring road
Since 3 May 2025, an Article 4 direction has meant planning permission is needed to turn a family house into a small house in multiple occupation. It covers all of Arboretum ward and parts of Abbey, Alvaston North, Darley, Mackworth, New Zealand, Normanton, Sinfin and Osmaston within the ring road.
Converting a garage into a bedroom for your own family doesn't touch it. Converting it so the house can be let to unrelated sharers as an HMO is a different matter, and the planning question there is the change of use, not the building work.
The old slab and the final certificate
Most garage floors are a bare slab a step below the house. The Planning Portal expects a new damp proof membrane and insulation, and building inspectors want the membrane lapped into the damp course in the walls. In the parts of the city the flood assessment names for groundwater, Markeaton and Alvaston among them, give that floor extra thought.
A ground floor bedroom in a flood zone is a poor bet. Government standing advice wants people on a ground floor to be able to reach a refuge above the flood level, so keep the bedroom upstairs and use the garage for something else.
Radon depends on the address, so look yours up on the UKradon map and ask building control what the new floor needs. Sign-off comes from Derbyshire Building Control Partnership, the shared service Derby uses, or from a private inspector. Keep the completion certificate somewhere safe.
Where these facts come from
- Derby City Council: vehicle access and dropped kerbs
- Derby City Council: planning constraints
- City of Derby Local Plan Review (saved policies)
- Mickleover Conservation Area Article 4 direction
- Derby City Council: conservation area FAQs (Article 4)
- Derby City Council: HMO Article 4 direction
- Derby City Strategic Flood Risk Assessment Level 1
- Derby City Council: building control (DBCP)
- Planning Portal: garage conversion planning permission
- Planning Portal: building regulations for garage conversions
- Planning Portal: garage workshop in domestic use
- Planning Portal: garage conversion flooring
- GOV.UK: flood risk assessment standing advice
- LABC: garage conversion tips from building control
- LABC: radon and building work
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Questions people in Derby ask
We're on an A road in Littleover. Is it fine to convert the garage and park on the front?
The conversion may need nothing from the planners, but a new dropped kerb onto an A, B or C road needs a planning application first. Paving the garden needs one too if it is over five square metres and doesn't drain. Sort the parking first.
Our house is on The Green in Mickleover. Can we replace the garage door with a window?
If your house is in the schedule to the 1992 Article 4 direction, no, not without planning permission, because it removes the right to alter doors and windows facing the road. Ask the council's development control team to confirm whether your house is listed.
We let rooms near the Arboretum. Would a garage bedroom need permission?
For your own household, the planning side is usually quiet. If the extra room is part of turning the house into a small HMO for unrelated sharers, the 2025 HMO direction means you need planning permission for the change of use, and the building work still needs Building Regulations approval.
Do we need building control if the garage just becomes a home office?
Almost always. The Planning Portal says turning a garage into habitable space normally needs approval. In Derby that comes from Derbyshire Building Control Partnership or an approved inspector.