Blue badge bay provision in a commercial car park

Accessible parking in a commercial car park is set by the adopted local standard and by the accessible buildings guidance the council expects you to follow, not by the Blue Badge scheme itself. The usual accessible parking bay requirement works out at around 5 per cent of capacity where the building is a workplace and around 6 per cent where it serves shopping, recreation or leisure, with a minimum of one designated bay however small the car park. Those proportions come from the accessible buildings standard, BS 8300-1, and from Approved Document M to the Building Regulations.

Get the numbers wrong and the fix costs little at drawing stage. Once the tarmac is down it costs a resurfacing contract.

Where the requirement actually comes from

Three separate strands meet in the same drawing. Planning policy and the authority's parking standards set the quantum. Approved Document M and BS 8300-1 set the dimensions and the relationship to the entrance. And the Equality Act 2010 sits behind both, because a service provider has a duty to make reasonable adjustments and a local authority exercising a planning function is subject to the public sector equality duty under section 149.

The Blue Badge scheme does something narrower than people assume. It governs who may use a designated bay on the highway and the concessions that attach to the badge, and the guidance for local authorities in England explains how badges are issued and enforced. It does not tell a developer how many bays to build off-street. Off-street provision in a private car park is a planning and building control matter.

That split explains a common argument at validation. An applicant says the bays are a Building Regulations issue to be settled later. The case officer answers that bay numbers and siting change the layout, the circulation and sometimes the landscaping, so they have to be fixed now.

Numbers as a proportion of capacity

Work from total capacity, then round up.

The enlarged standard bay is the part most schemes miss. Not every disabled driver or passenger holds a blue badge, and a wider standard bay with a little extra length helps people who can walk but cannot open a door fully in a 2.4m space. Where a car park is large, placing that allowance near the entrance alongside the designated bays is sensible.

Two caveats. Local standards sometimes set higher figures, particularly in town centres and at health and leisure uses, so read the adopted parking standards document rather than relying on the national guidance alone. And where a car park is shared between uses, calculate against the capacity serving each use rather than the whole site, then provide whichever total is higher.

Bay dimensions, transfer zones and hatching

A designated bay is a 2.4m by 4.8m space with a 1.2m wide access zone on each side and a 1.2m zone at the rear, which gives an overall footprint of 3.6m by 6.0m where bays are not paired. Two bays can share a single central access zone, so a pair occupies 6.0m across rather than 7.2m.

The hatched zones are not spare space. They cannot be counted as manoeuvring area, they cannot be used to meet the aisle width, and they should not be swallowed by a kerb upstand or a planter. Where a bay abuts a footway, the rear zone is usually placed behind the vehicle so a wheelchair user can transfer at the boot. For the wider set of figures, including bays on a slope and bays serving residential schemes, our guide to accessible parking dimensions, numbers and distances sets them out in one place.

Illustrative example: a retail unit with a 60 space car park. At 6 per cent, four designated bays are expected. Laid out as two pairs sharing central access zones, those four bays take 12.0m of frontage and 6.0m of depth, which is 1.2m more depth than the standard rows either side. If the designer keeps the row depth uniform at 4.8m, the rear transfer zones vanish into the aisle and the highway officer will ask for the layout to be redrawn.

Distance and route from the bay to the entrance

Designated bays belong as close to the principal accessible entrance as the layout allows, on a route that does not cross a service yard or a delivery lane. Guidance measures the distance from bay to entrance, and a figure of around 50m is widely applied as an upper limit for designated bays at shops and leisure uses.

Distance is only half of it. The route has to be step free, lit, wide enough for a wheelchair to pass a person walking the other way, and free of the bollards and cycle stands that tend to appear at the detailed design stage. Where the entrance is on a different level, a ramp or lift has to be shown on the planning drawings rather than left to a later condition.

Surface, gradient and crossing the kerb

Bays should be firm, level and well drained. A gradient no steeper than 1:50 across a bay is the figure usually applied, because anything steeper makes a wheelchair difficult to hold and a car door hard to control. Loose gravel and grass reinforcement fail on designated bays even where they are acceptable elsewhere on the site for drainage reasons.

Where the route leaves the bay and crosses a kerb, a flush dropped kerb with tactile paving is needed, and the dropped section has to line up with the access zone rather than sitting 3m away. Surface water should be taken away from the transfer zone, not across it. And if the car park is unlit at the hours the use operates, the lighting design belongs in the submission, because adding a column later can disturb a tree root protection area or a drainage run.

Signing, marking and keeping bays usable

Markings and signs do the day to day work. The bay should carry the wheelchair symbol in the surface marking, with an upright sign where parked vehicles would otherwise hide it, and the words on any sign should match the enforcement regime the operator intends to use.

Enforcement on private land rests on contract rather than on the Blue Badge concessions, so the operator needs terms and signage that allow misuse to be addressed. Planning can secure the provision but cannot police it, which is why a short management statement is worth submitting with the application. A Travel Plan is the natural home for that commitment on a larger scheme, alongside the monitoring arrangements.

What to put in the application

1. A dimensioned car park layout showing designated bays, shared access zones, enlarged standard bays and the aisle widths.
2. A schedule of total capacity, the percentage applied and the resulting bay numbers, with the policy reference.
3. The step free route from bay to entrance, marked on the plan with distances.
4. Gradients across bays and along the access route.
5. Dropped kerb and tactile paving positions.
6. Surface specification and the drainage approach for the bays.
7. A short note on signing, marking and how misuse will be managed.

On a scheme large enough to need transport evidence, fold the accessible provision into the Transport Statement or the assessment rather than leaving it to the architect's drawing alone. Officers read the written evidence when they draft conditions, and provision described in words is harder to erode at the discharge of conditions stage. Smaller commercial schemes can deal with it in a paragraph of the covering submission, provided the drawing carries the dimensions.

You can see which supporting documents a commercial scheme is likely to need by entering the postcode on PlanScope and answering the guided questions.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it, and confirm the current editions of Approved Document M and BS 8300-1, which are revised from time to time.

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