Designing out crime: CPTED basics for a commercial property.

Crime Prevention Through Environmental Design, usually shortened to CPTED, is the practice of designing and managing a place so that offending is harder, more visible and less rewarding. The Queensland Police Service publishes CPTED Guidelines for Queensland, first developed in 2007 and updated in 2021, written for businesses as well as councils and planners. On a commercial property the highest-value changes are usually the cheap ones: light the things worth protecting, open up the sightlines, make the boundary between public and private obvious, and keep the place looking cared for.

The seven principles in plain English

You will see CPTED summarised elsewhere as three or four principles. Queensland uses seven, and the guidelines are explicit that they are not rules and not universal solutions. They point at what matters in a particular setting, so you still have to look at your own site.

• Activation. More legitimate people using a space means more chance something wrong gets noticed. A loading dock with traffic all day is a different proposition after hours.
• Surveillance. Designing so people in and around a space can see into it. The guidelines call this passive surveillance, and separate it from the active surveillance that officers and monitored CCTV provide.
• Ownership. A site that looks like somebody cares about it reads differently to one nobody has touched in months.
• Stakeholder management. The maintenance principle: rubbish removal, working lights, fast repairs, and a regular audit of whether any of it still holds.
• Legibility. People can tell where they are and where they are meant to go.
• Territoriality. A clear line between public and private ground, so anybody in the wrong place stands out.
• Vulnerability. Some places carry more risk. The guidelines single out ATMs, service stations, car parks and isolated transport stops.

Lighting: what the evidence supports

Lighting is the first thing most owners reach for, and the research backs it, with limits worth knowing. A 2022 systematic review by Brandon Welsh, David Farrington and Stephen Douglas in Criminology and Public Policy pooled 21 street lighting studies from four countries across almost 50 years. Lit areas showed a 14 per cent reduction in total crime against comparable control areas, significant for property crime and not significant for violent crime.

The effect was larger in studies that measured daytime crime as well as night crime. If lighting worked purely by making things easier to see after dark, the benefit would sit only at night. Part of what a well-lit site signals is that somebody is spending money on the place, and that reads at any hour.

The Queensland guidelines add two qualifiers. Lighting should support surveillance and minimise shadows and glare, and it should be designed against the technical standards rather than by eye. For paths and outdoor car parks that is AS/NZS 1158.3.1, the pedestrian area lighting standard, updated in 2020. They also warn that an area nobody can see into from outside can still be damaged whether it is lit or not, so lighting a corner nobody overlooks mostly helps the offender see what they are doing.

On a commercial site that means:

• Light the assets and the routes people use: the entry, the staff door, the car park, the path between them, the store or compound.
• Even coverage beats bright pools. A very bright light next to a dark gap makes the gap harder to see into.
• Aim it down and shield it. Glare that hits a passing driver or patrol officer hides the site instead of revealing it.
• The guidelines want a main entry visible from the street, signed legibly day and night, lit inside and out, with no concealment spots beside it.

Sightlines, fences and the concealment problem

Sightlines cost nothing and get lost slowly. Planting matures, a stack of pallets becomes permanent, and a year later there is a spot beside the roller door that cannot be seen from anywhere. The Queensland practices are specific: maintain view corridors over low bushes and walls and under tree canopies, and design out the blind spots. Vegetation is the usual culprit, and the fix is a pruning schedule rather than a redesign.

Fencing is where owners most often work against themselves. Solid hoarding feels stronger, and it removes every passing set of eyes once somebody is over it. The guidelines illustrate the balance with a house: a front fence no higher than 1.2 metres, or 1.8 metres if at least half of it is transparent. The number is residential and the logic carries to a commercial boundary. Define the edge without blinding the street. The same goes for grilles and shutters, because a shopfront that goes blind at 6pm has given away surveillance for the whole night.

Boundaries and upkeep

Territoriality is not about building higher. The Queensland practices ask that boundaries be defined without resorting to high fences, keep-out signs and guards where other means will do, using planting, changes of surface and level, low walls, seating and signage to mark where public ends and private begins. Entry from public into private space should be obvious, so that somebody standing in the wrong place is visibly in the wrong place.

Of the seven, upkeep is the one most often skipped, and it is the cheapest to fix. The guidelines call for regular rubbish removal, maintained lighting, signage and landscaping, fast repair of damage, graffiti resistant finishes, and current contact details on site so problems get reported. Two lights out, a gate that no longer latches and graffiti that has been up a month all say the same thing about how closely a site is watched.

Where design stops and security starts

CPTED reduces how often you need a response. It does not remove the need for one, and the guidelines draw that line themselves: where the principles cannot be applied far enough in the design, they direct you to organised technological and human surveillance, or to measures such as duress points.

Cameras sit in that second group, and they earn their place when positioned for a defined job, which is why we scope CCTV and surveillance around coverage before anyone talks about hardware. Our guide to choosing a CCTV installer in Ipswich covers what to ask first.

Design also changes how a trespass problem plays out. If you are already dealing with repeat entry, our post on trespassers on commercial property in Queensland sets out the options.

A walk-around you can do this week

Do it twice, once in daylight and once after dark, with a notepad.

• Stand at each boundary and look in. What cannot you see, and what is in the way?
• Walk the route your last person out takes to their car, and note every dark stretch.
• Count the lights that are out or aimed at nothing.
• Find every spot where a person could stand unseen. That is your concealment list.
• Ask the people who lock up which part of the site they dislike being at alone. They already know.

That covers most of what a small site needs. Larger properties, particularly ones where security has been added piece by piece over years, need somebody to look at it properly. That is what a security consulting engagement does, and the report is written to be acted on regardless of who does the work.

Questions we get

Does better lighting actually reduce break-ins?

The best available evidence says yes, modestly, and mostly for property crime. The 2022 Welsh, Farrington and Douglas review pooled 21 street lighting studies and found a 14 per cent reduction in total crime in lit areas against comparable control areas, significant for property crime and not for violent crime. Lighting works best where it helps someone see the space. A corner nobody overlooks can still be damaged whether it is lit or not.

What does a commercial security audit look at?

A site risk assessment covers the perimeter, doors and locks, lighting, sightlines, CCTV coverage and alarm posture, plus an access control review and the site's incident history. It ends in a written threat profile and a prioritised recommendation list split into quick wins, structural changes and longer-term capital spend, with indicative budgets. It should be useful whether or not the firm that wrote it does the work.

Get a set of eyes on your site

We do written site risk assessments across Ipswich, Booval and the wider region, fixed-priced against a defined scope. Tell us the property and what has been happening on it. Request a consultation → or call 0414 829 850.

Published 8 September 2026 · Anthony Tupper, Founder · Tupper Security Services holds Queensland Security Firm Licence (Class 1) #4572076.