Private Property & Customer Parking Signs Explained

A car park on private land runs on a different footing to the street outside it. Council parking signs carry the weight of road law; your car park sign works by setting the conditions of entry a driver accepts when they pull in. Get the wording and placement right and unauthorised parking is manageable. Get it wrong, most often by copying a council sign, and the sign can be worth very little. This guide covers what a private property parking sign has to do, where it goes, and the enforcement limits that vary by state. For signs on roads and shared traffic areas, see our guide to car park & traffic signs, and browse the full car park & parking signs range.

What are private property parking signs?

Private property parking signs are the signs a landowner or occupier uses to control parking on land the public can drive into but does not own: a shop car park, a strata block, a medical centre, a depot yard or a staff car park. They tell a driver who may park, on what terms, and what happens if they ignore it.

The legal mechanism is different to a street sign. A council No Stopping sign is a regulatory device backed by road rules and enforced with infringement notices. Your car park sign is closer to a notice of terms: it sets out the conditions on which you allow a driver onto your land. That is why the wording carries so much weight, and why a private parking notice is not a fine, whatever it is titled.

Does AS 1742.11 apply on private land?

AS 1742.11 Manual of uniform traffic control devices, Part 11: Parking controls is the Australian Standard covering parking signs and pavement markings, including linear and area parking control, sign design, placement and reflectorisation. On a public road it is the reference. On private land it is guidance rather than a rule, though councils commonly expect signage to follow it where the public can access the car park, and following it makes a sign easier to read at a glance.

There is one rule that matters more than any of that: a private sign must not pass itself off as an official one. Regulatory parking signs belong to councils and road authorities. Reproducing their colours, symbols and wording on private land invites a challenge to the whole sign. Purpose-made private property signage uses its own wording, such as “Private Property”, “Customer Parking Only” or “Unauthorised Vehicles May Be Towed”, precisely so it is clearly a landowner’s notice and not an imitation of a council sign.

Types of private property parking signs

Most car parks need a small set working together rather than one sign at the gate:

• Entry / conditions-of-entry signs: the controlling sign, at the vehicle entrance, stating that the land is private and on what terms parking is permitted.
• Customer or client parking only: reserves the bays for the people the car park is there to serve.
• Reserved, permit and staff bay signs: allocate individual bays by name, unit, permit or role.
• Visitor parking signs: direct visitors to the right bays and away from resident or staff spaces.
• Tow-away and unauthorised vehicle warnings: state the consequence, which only works if it is true and lawful where you are.
• No parking / keep clear markings: protect access ways, loading zones, bin pads and fire paths.
• Accessible bay signage: marks accessible spaces so they stay available to the people who need them.

Where the car park also carries pedestrians and vehicles in the same space, add the traffic layer as well: speed limit and shared zone signs for the driving surface, and prohibition signs where entry has to be refused outright.

Where to put them so they actually work

Placement is what turns a sign into a condition of entry. A driver can only accept terms they had a fair chance to read before committing to park.

• At every vehicle entrance, facing the driver, far enough back to be read at approach speed, not after the turn-in.
• At the bays themselves, so a reserved or customer-only bay is unambiguous from the driver’s seat.
• Repeated through larger car parks, so terms are visible from anywhere on the lot rather than only at the gate.
• Lit or reflective where the car park is used after dark.
• Mounted at a readable height and kept clear of foliage, parked trailers and stacked stock.

Specify an outdoor substrate: metal or aluminium rather than adhesive vinyl. A faded, unreadable sign is the easiest thing for a driver to dispute. Pair the parking terms with any notice signs covering the rest of your conditions of entry.

Enforcement: what a sign can and cannot do

This is where owners most often over-reach, and the rules are not the same across the country.

Wheel clamping is banned in some states. Western Australia prohibits vehicle immobilisation (clamps, boots and similar devices) as a parking control, and Queensland makes it unlawful to detain a parked vehicle with an immobilising device. Do not put clamping on a sign without checking the position where the car park is.

Towing is conditional, not automatic. Where towing from private land is permitted it typically comes with obligations: adequate signage, waiting periods, and reasonable steps to find the driver first. A tow-away warning sign is one requirement among several, not authority on its own.

A private parking notice is not an infringement. Only an authority can issue one. Wording that imitates a government penalty notice undermines the sign and the notice together. Check the current position with your state road or transport authority, or take legal advice, before promising a consequence on a sign.

Private car park signage checklist