Lose a parking space, put it back on the plot
The council's Householder Development SPD, in force since 1 June 2026, has a paragraph headed "Conversion of existing garages". It says the room you create may cost the house its on-site parking, and that any space lost "must be re-provided on the site" to the standards in the Local Plan's parking annex.
That only bites when the work needs planning permission, and internal work that doesn't enlarge the house usually doesn't. The catch is the same paragraph's warning that many Crawley homes have conditions on their original consent stopping the loss of parking and garaging. If yours does, you are making an application, and the planner will ask where the car goes now. Ask the council for the decision notice for your road before you pay anyone to draw.
The SPD also says a converted garage has to be part of the house, not a separate unit. And any new window, door or wall should match the original in size, style and colour, lined up with the openings already there. A brick panel and a window that copies the ones beside it is what officers want to see.
Garages that aren't next to the house
Plenty of New Town houses were grouped round courts that face away from the road. The council still rents out thousands of lock-up garages across the neighbourhoods. A lock-up is a tenancy, not part of your home, so it isn't yours to convert. Everything below is about a garage on your own plot.
Size matters in a parking argument. The SPD borrows Manual for Streets' minimum garage of 3 metres by 6 metres. A narrower one was never a full-size space by that measure, so say so in any application.
Front gardens, verges and the dropped kerb
Re-providing the space usually means the front garden. A parking bay has to be at least 2.4 metres wide and 4.8 metres long, and the SPD won't accept a new drive where a car can't fit. It asks for permeable or porous surfaces, with no water running onto the road, because paved-over front gardens add up to more flooding.
Crawley's estates make the rest harder. Some permissions keep the street open plan, so even a low front wall may need consent. Officers resist crossings over large green verges, and refuses them where trees would be lost or public parking on the street would shrink. The dropped kerb itself is licensed by West Sussex County Council highways, applied for by your contractor, and a new access onto a classified road needs planning permission from the borough as well.
Integral garage. If your house in Maidenbower, planned as a private neighbourhood in 1986, or in Forge Wood, the newest, has one built in, start with the conditions. The Planning Portal points to new housing developments as the place to check whether conversion rights were removed.
Single garage. In parts of Crawley the original stores and garages were built with flat roofs. One of those needs insulating and probably recovering, and the infilled door opening needs a footing in clay ground.
Read our full guide: Single Garage Conversion: What Is Involved and What to Budget For →
Bedroom. In a flood zone the council wants sleeping space upstairs. Where a ground-floor bedroom goes ahead there, the floor may have to be raised above the expected flood level, which eats into headroom. Near the Mole or the Gatwick Stream, check the flood map first.
Home office. Quiet, close to the kitchen and easy to wire for broadband. Once it is heated and used every day it counts as living space, so building regulations approval applies just as it would for a bedroom.
Utility or playroom. Keeping a store behind the old door leaves the front of the house unchanged, which helps on a conservation area street.
Double garage. Converting one bay and keeping the other is the obvious way through a parking condition. Measure the half you keep against the 3 metre width the SPD quotes.
Gym or studio. Think about the neighbour first. If the garage shares a wall with next door, line it for sound, and lay a floor that can take dropped weights before anything else goes in.
Detached garage. Kept for the household's own use, as a workshop or gym, the Planning Portal says permission is typically not needed. The council's guide says an outbuilding should not be main living space, and turning one into a separate home may need permission whatever the works.
Planning and building control. Two separate checks. Planning turns on conditions, conservation areas and listed buildings. Building regulations cover structure, fire escape, damp and radon, ventilation and insulation, and the council's own team, Crawley Building Control, does that work.
Cost and value. No prices here. A new bay and dropped kerb, a raised floor or a new flat roof can each change the job, so get three firms to look at your garage and your front garden together.
Conservation areas and the front of the house
The council's guide reminds owners that some permitted development rights don't apply in a conservation area, an Area of Special Local Character, or to a listed or locally listed building. None of Crawley's Article 4 directions is aimed at garage doors. The one about walls and fences covers a single site.
Forestfield and Shrublands in Furnace Green is the place to tread carefully. The council lists keeping cars and people on separate routes among the estate's features, so a change to how a house meets its parking will be read against the whole layout. Talk to the planners first.
On radon, building control may ask for precautions in a conversion where the ground calls for it. Look up your address on the UKradon map before the floor is designed.
Where these facts come from
- Crawley Householder Development SPD (adopted June 2026)
- Crawley Borough Local Plan 2023 to 2040 (Parking Standards Annex)
- Crawley Borough Council: garages and storage
- West Sussex County Council: dropped kerbs
- Crawley Borough Council: Forestfield and Shrublands
- Crawley Borough Council: Article 4 directions
- Crawley Borough Council: building control
- Planning Portal: garage conversion planning permission
- Planning Portal: building regulations for garage conversions
- Planning Portal: converting a garage into a workshop
- GOV.UK: Approved Documents
- LABC: do I need to consider radon?
How FirQuote works in Crawley: We connect you with local specialists who visit your property before giving you a price. You get up to 3 written quotes — no call centres, no estimates from photos, no obligation to accept any quote.
Questions people in Crawley ask
We rent a council lock-up round the corner. Can we turn it into a workshop with power?
Ask the council as landlord. The lock-ups are let for a car or stored items, with some commercial storage allowed under the tenancy terms. They aren't yours to convert.
Our Maidenbower garage has a condition about keeping it for parking. What now?
You need planning permission, and the council will expect the lost space to be put back on the plot. Show a bay of at least 2.4 by 4.8 metres in permeable paving on the drawings, and check whether a dropped kerb needs a West Sussex highways licence.
Can we widen the drive across the grass verge outside?
Possibly. Crossings over large green verges are resisted, and ones that lose trees or on-street spaces are refused. Get a view from the planners and West Sussex highways before you build the room that depends on it.
Who signs off a garage conversion in Crawley?
Crawley Building Control, the council's own service since October 2025, unless your builder uses a registered building control approver. Keep the completion certificate. A buyer's solicitor will ask for it.