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A Midlands warehouse manager recently flagged a problem with a rear fire door. It no longer shut as it should. What bothered the engineer sent to check it was not the door as such. It was the fact that weeks had passed before anyone spotted it. The hinge had sagged, leaving a small gap. Staff had wedged the door open for air on several occasions. And the alarm sensor protecting that entrance had gone untested since installation three years earlier.
In the end, nothing came of it. There was no break-in. There was no loss and no incident to log. Yet this is precisely the sort of weakness that makes an opportunist’s job simple. It is also much more widespread than most owners realise.
According to the Home Office’s Commercial Victimisation Survey, nearly a third of firms across the UK will suffer some kind of crime this year. The figure spans a broad range of offences, from theft by customers to attacks on employees. Burglary and vandalism still make up a significant part of it. These are exactly what good security is meant to stop. In any given year, 8% of firms report a burglary or an attempted one. Another 8% report vandalism. ONS data adds to the picture. In the twelve months to March 2025, there were 78,707 non-domestic burglaries recorded in England and Wales alone. That is a large number. It is also unevenly spread. Some premises are simply softer targets. The gap between them is rarely one glaring failure. More often it is a few physical and procedural weaknesses that accumulate quietly over time.
Specialists who survey commercial sites see the same five red flags repeatedly. That applies to single retail units and sprawling multi-building warehouse complexes alike. No single sign is dramatic. Taken together, they show clearly how vulnerable a site really is.
1. Gaps in Camera Coverage
Cameras are almost universal in business. Cameras placed to watch the likely entry points are not.
The story is familiar. An ageing commercial CCTV system was fitted years ago. It was then extended bit by bit as the building evolved. New extensions, stores and parking areas were never properly included. Engineers often find old analogue kit still running. Its resolution is too poor to pick out a face or registration plate at any practical range. Recorders keep footage for just a few days and then write over it. Cameras point at the car park entrance while a side loading bay goes unwatched.
The answer is not always to “install more cameras.” Sometimes two existing units just need moving to remove a blind spot. Sometimes an ageing DVR should give way to an IP-based NVR system. That brings proper retention, remote viewing and alerts triggered by motion. The real test is whether coverage matches the building’s genuine weak points. Where cameras were fixed a decade ago is beside the point.
2. Weak or Patchy Outdoor Lighting
Few problems are easier to solve. Few are ignored more often. Overgrown bushes cover a dusk-to-dawn sensor. A motion-triggered floodlight has been out for months. No one reported it, because no one is there after dark to see. Lights were fitted when the building went up. Nobody reviewed them as planting grew or extensions appeared.
Bad lighting does more than hinder visual checks. It also weakens CCTV. Even a quality camera struggles in poor light without enough illumination or infrared suited to the range. Engineers learn a great deal from a five-minute walk around the boundary at night. It shows which zones are truly lit. It shows which are lit from the wrong angle. And it shows which have quietly gone dark.
3. Alarms Left Untested and Unserviced
Intruder alarms often go over a year without a service visit. Seasoned installers hardly comment on it now. A system is fitted and commissioned. After that it is mostly ignored, unless a false alarm prompts attention.
There are two reasons this matters. The first is that sensors deteriorate. PIR detectors can lose calibration. Backup batteries outlive their useful life. Dual-technology detectors, which pair microwave and infrared sensing, need recalibrating from time to time to perform properly. The second reason is often bigger: compliance. Under current national policy, systems kept to BS EN 50131 can qualify for police response. They must also be monitored via an alarm receiving centre approved by the NSI or SSAIB. If maintenance slips and false alarms pile up, that priority can be removed altogether. The business is then left depending solely on a keyholder or a third-party responder.
Routine servicing is not paperwork for its own sake. It keeps the system doing the job it was bought for.
4. Access That Is Unmanaged or Out of Date
Owners find this one the most surprising. It seldom looks like a security issue until someone traces it. Master keys remain unchanged after several waves of staff leaving. Alarm codes were shared with a team years back and never reset. Former employees still hold fobs that were never switched off.
Consultants frequently visit sites where the manager honestly cannot say how many working keys or codes are out there. That is no slight on the manager. It is the natural result of years of staff churn. Without a proper access control system, nobody logs who entered, who left, or when.
Modern access control can use cards, fobs or biometrics. Either way, it does two things shared keys cannot. It limits entry by time and zone. It also produces an audit trail. When an incident occurs, that log often separates knowing the facts from guessing at them.
5. Detection With No Response Attached
An alarm that sounds endlessly with no one answering is, in practice, as good as no alarm. Yet some sites still run a standalone intruder alarm. It has no link to a monitoring station. It relies on noise alone to scare off an intruder or catch a passer-by’s attention.
Monitoring closes that gap. The system connects to an alarm receiving centre, supported by an up-to-date keyholder list. Once a signal arrives, the ARC can check the alert. It can ring keyholders in the right sequence. Where the system is eligible, it can also ask for police attendance. Without that connection, response is left to luck. Does someone hear the alarm? Do they know whom to call? Can that person actually be reached?
Keyholder lists deserve a separate check as well. Engineers often find dead phone numbers on them. They find names of staff who have since left. They find contact orders that no longer match who is free at short notice.
Pulling It All Together
On its own, none of these five problems is disastrous. A dim floodlight will not sink a business. Nor will a keyholder list nobody has reviewed. The trouble is that they tend to appear together. Poorly lit sites often have old CCTV that was never upgraded to make up for it. Firms that forget to deactivate old fobs are often just as careless about alarm servicing. The risks build on each other.
A good site review is not about spotting one headline flaw. Its value lies in seeing how the five areas fit together and influence one another. A warehouse may have excellent CCTV. Without a monitored alarm, it still has a serious gap. A shop may keep its alarm in good order. If its cameras have blind spots, opportunistic thieves can still slip past, and the alarm alone will not stop them.
Some owners will recognise one or two of these issues in their own buildings. For them, the next move is simple. Bring in a qualified person to walk the site thoroughly. Do not wait for an incident to force the issue. The warehouse manager at the start was fortunate. The weakness surfaced before anyone took advantage of it. Not every firm will be so lucky. With commercial burglary at its current level, luck is no strategy to rely on.
