A car showroom forecourt: display, lighting and signage

Displaying cars for sale on open land is a use of land, so car showroom forecourt planning permission is normally required for the display area even where the showroom building itself is already in use for vehicle sales. The sale and display of motor vehicles is a sui generis use, outside the Use Classes Order, which means almost any change involving it needs an application. Lighting, banners and transporter unloading then generate the conditions.

Forecourt applications are refused on lighting and highway grounds far more often than on principle.

The use class position for vehicle sales

Motor vehicle showrooms sit outside the use classes, as a use in their own right. That has two consequences worth understanding before you plan anything.

A change from any other use into vehicle sales needs permission. A former retail unit, a former petrol filling station or a vacant industrial yard all require an application, and the fact that the previous use was commercial does not help. And a move out of vehicle sales into another use needs permission too, which is why these sites often sit vacant longer than their neighbours.

Extending the display area onto land not previously used for display is also a material change of use of that land. Grass verges, a former storage yard behind the building, a strip of forecourt previously laid out as customer parking: all of them need permission for display use, and all of them get noticed, because a row of cars on previously open land is visible from the street.

Forecourt display and whether it needs permission

Three questions settle it.

Ramps, plinths and display rotators are structures, so they need permission in their own way even on established display land. The same is true of a flagpole over a stated height, a canopy and a customer handover bay.

Where the position is uncertain because the forecourt has been used informally for years, a certificate of lawfulness for an existing use under section 191 of the Town and Country Planning Act 1990 is the way to settle it. The evidential test is on the applicant, and it needs more than a recollection: aerial imagery, dated photographs, sales records and sworn statements.

Lighting levels and spill onto the highway

Display lighting is the issue that decides these applications. The commercial pressure is to light the stock brightly enough to be seen from a passing car at night, and that is precisely what causes the harm.

The Institution of Lighting Professionals guidance note on obtrusive light sets limits by environmental zone, with tighter figures for darker areas and separate, stricter limits after a curfew time. Assessment looks at vertical illuminance at nearby windows, the luminous intensity of each luminaire as seen from a receptor, upward light, and the potential for glare to drivers on the adjoining road.

The design answers are well established and cost little to specify at the outset.

• Asymmetric optics directing light down onto the display area, with no light above the horizontal.
• Mounting heights chosen so the beam does not cross the site boundary.
• Column positions set back from the frontage rather than on it.
• A curfew setting that cuts display lighting to a security level after closing.
• A colour temperature that does not read as floodlighting against a residential backdrop.
• Measured commissioning results submitted to the authority after installation.

A Lighting Assessment prepared against the guidance, with contour plots and receptor calculations, is the document that gets this approved. Submitting a manufacturer's brochure instead is the reason many of these schemes go to a second round of consultation.

Illustrative example: a showroom on an A road with housing opposite. The original scheme proposed 8m columns on the frontage with symmetric floodlights, predicting vertical illuminance at the facades opposite well above the curfew limit for that environmental zone. The approved scheme uses 6m columns set 4m back with asymmetric optics, a 60 per cent dim after 8pm and a security level after 10pm. The display still reads from the road. Those figures are illustrative.

Flags, banners and advertisement consent

Advertisements are controlled separately, under the Town and Country Planning (Control of Advertisements) (England) Regulations 2007. The Regulations grant deemed consent for several categories, including certain flags and signs on business premises within stated size and position limits, and express consent is needed for everything else.

Forecourt practice tends to drift well beyond deemed consent. Bunting strung between columns, inflatable figures, A-boards on the footway, vehicle-mounted signs parked at the boundary and a row of printed flags along the frontage are all capable of needing express consent, and some of them also obstruct the highway. Authorities can and do take enforcement action, and the discontinuance power lets them remove even a deemed consent display where it harms amenity or public safety.

The two considerations the authority may apply are amenity and public safety, and nothing else. A well argued case on a sign's size, illumination and position addresses those two matters directly rather than explaining why the business needs the sign.

Valeting, interceptors and drainage

Valeting changes the drainage picture. Washdown water carries detergents, oils and traffic film, and it cannot go to a surface water drain.

The standard arrangement is a bunded wash bay draining to foul sewer through a suitably sized separator, with the water undertaker's trade effluent consent in place. Where no foul connection exists, a sealed tank with tankered removal is the fallback, and it has a running cost that surprises operators. Open forecourt areas where vehicles are parked need a separator on the surface water outfall as well, sized for the drainage area.

Set this out in a Drainage Strategy with the separator class, the catchment areas and the discharge point. Where a workshop, MOT bay or spraying is proposed, that is a further change of use and brings its own noise, odour and permitting questions, so do not bundle it into a display application and hope it passes unnoticed.

Delivery transporters and unloading

A car transporter is long, its ramps need clear space, and unloading on the public highway is the complaint that follows a showroom opening. The highway authority will want to see unloading within the site.

Show it with vehicle tracking for the largest transporter you expect to receive, including the swing of the deck ramps and the headroom needed to raise them. Demonstrate that the transporter can enter, unload and leave in forward gear where possible, and that unloading does not block the customer access or the display area. A Transport Statement with tracking drawings and a servicing schedule covers this proportionately for most sites. Our note on cash and carry to trade counter and the retail tests deals with the related question of how trade and customer traffic are separated on a single yard.

Conditions commonly applied

1. Display limited to the area shown on an approved plan, with no vehicles displayed elsewhere on the site.
2. No vehicles to be displayed, stored or repaired on the public highway or verge.
3. Lighting installed in accordance with approved details, with a dimming or curfew regime and commissioning results submitted.
4. No external amplified sound or public address system.
5. No vehicle repairs, servicing, MOT testing or spraying without a separate permission.
6. Hours of opening, and separate hours for deliveries and transporter unloading.
7. Oil separator and wash bay drainage installed before the use begins and maintained thereafter.
8. No flags, banners or bunting other than any display with consent under the advertisement regulations.

You can see which supporting documents a forecourt or showroom scheme is likely to need by entering the postcode on PlanScope.

This is general guidance, not legal advice. Check the position with your local planning authority, the highway authority and your water undertaker before relying on it.

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