Most construction sites are not targeted by sophisticated criminals. They are targeted because they are easy. A gap in the hoarding that nobody closed after a delivery, a compound overlooked by a footpath, a drum of cable left where it was dropped on Friday afternoon. The same handful of problems account for most of what goes wrong on the sites we cover, and the majority of them are decided long before the first officer signs on, in how the job was specified.
What follows is the list we work through with a client before mobilising, and what actually addresses each item.
1. Theft of plant, materials and fuel
Theft is rarely opportunistic in the way people imagine. The things that disappear are the things with a resale market and no serial number worth tracing: copper cable, hand and power tools, fuel from plant left on site, first-fix materials sitting in the open between delivery and installation, and increasingly the plant itself where keys are interchangeable across a manufacturer’s range.
The timing is just as predictable as the target. Losses cluster around the quiet periods that anyone watching a site can identify without effort: weekends, bank holidays, the shutdown between Christmas and the new year, and the days immediately after a large delivery when material is on site but not yet fixed. If a site is going to be hit, those are when.
That predictability is the useful part, because it means cover can be weighted rather than spread evenly. A single measure rarely works on its own. What does work is layering: sound hoarding and a compound that is actually closed, lighting that removes the dark corners, monitored CCTV covering the approaches and the compound rather than pointing at the middle of the site, and a physical presence during the periods that matter. On sites that do not warrant a permanent officer, mobile patrols at irregular times are more effective than a fixed nightly visit, which simply teaches anyone watching when the site is empty.
Where a site holds high-value plant or has already been hit, a permanent SIA-licensed officer is usually the cheaper option once the cost of a single loss, the plant hire standing charge and the programme delay are counted together.
2. Trespass, and the people who are not there to steal anything
Not everyone who gets onto a site is there for the copper. Children treat a part-built structure as somewhere to explore, and an unfinished stair core or an open lift shaft is more dangerous to them than anything on a completed site. Urban explorers climb scaffolding for photographs. In the colder months, people sleep in part-complete buildings and in welfare units.
This matters commercially as well as morally. An occupier owes a duty of care even to people who had no right to be there, and a serious injury to a trespasser on a live site is a far larger problem than a stolen tool. It is also the risk most often left out of a security specification, because the brief is usually written around theft.
The measures overlap with theft prevention but are not identical. Perimeter integrity is the first line, and it degrades constantly as deliveries come and go, so it needs checking rather than assuming. Beyond that, the difference is presence and response time. A camera records a child climbing a scaffold. An officer, or a patrol that arrives quickly on an alarm, stops it.
3. Not knowing who is on site
Ask a site manager at three in the afternoon how many people are on site and how quickly they could name them. On a well-run job the answer is immediate. On a busy job with multiple subcontractors and a gate that has been propped open since the morning pour, it often is not.
This is a safety problem before it is a security problem. In an evacuation, the roll call is only as good as the record of who signed in, and an inaccurate headcount means either a search for someone who went home at lunchtime or, worse, no search for someone who did not.
A gateman on the access point solves several problems at once: inductions are checked before anyone gets past the gate rather than afterwards, subcontractors and visitors are logged in and out, deliveries are booked in against the programme, and there is a live record of who is on site. It is the least glamorous role on a site and frequently the one that pays for itself fastest.
4. Vehicle movements and the interface with pedestrians
The most dangerous routine activity on most sites is a vehicle reversing. Add a constrained urban site, a public footway running past the gate, deliveries arriving without a booked slot and a driver who has never been to the site before, and the risk rises sharply.
Separating people from vehicles is a design problem first, solved in the traffic management plan and the site layout. But plans assume compliance, and compliance needs someone on the ground. Traffic marshals direct vehicles in and out, control the interface with the public footway, and stop the reversing manoeuvre that the plan assumed would not be necessary. On sites with significant or complex vehicle movements, this sits alongside wider traffic management rather than being bolted on afterwards.
5. The quiet phases nobody budgets for
Two phases of a project are consistently under-protected, and both are gaps in the contract rather than gaps in the fence.
The first is before enabling works begin, when a site has been acquired and cleared but nothing is happening yet. It is empty, unwatched and often not yet anyone’s responsibility on the programme. The second is the handover gap at the end, after the contractor demobilises but before the client occupies, when the building is at its most valuable and its most vulnerable. Everything is installed, nothing is being used, and the security that covered the construction phase has already been stood down.
Both are vacant property problems rather than construction security problems, and they are cheap to cover precisely because the site is quiet. They are expensive to ignore.
6. Welfare, including the security team’s
An officer on a twelve-hour night shift with nowhere warm to sit, no working toilet and no means of making a hot drink is not an alert officer at four in the morning. This is the most commonly overlooked item in a security specification, and it directly determines the quality of the service delivered.
Where the site does not already have suitable provision for out-of-hours cover, it needs to be specified alongside the officer. Site cabins and welfare units are part of the same conversation as the guarding, not a separate procurement exercise to be resolved later.
7. Evidencing it to the principal contractor
Increasingly the question is not whether a site is secure but whether that can be demonstrated: at a client audit, in a tender return, or after an incident when an insurer asks what was actually in place on the night.
Three things matter here. Every security officer supplied must hold a valid Security Industry Authority licence for the role they are performing, and that is verifiable. The management systems behind the service should be certified rather than asserted; Andor Group holds ISO 9001, ISO 14001 and ISO 45001, together with SafeContractor and Constructionline accreditation. And the day-to-day record needs to exist: timestamped patrol logs, incident reports and visitor records, available to the client rather than sitting in a book in a cabin.
That last point is the one that tends to get skipped at procurement and missed badly afterwards. A patrol that was not recorded is, for evidential purposes, a patrol that did not happen.
8. Getting the specification right before mobilisation
Almost every problem above is cheaper to solve at pre-construction than in week six. A security provider given the programme, the site layout, the delivery schedule and the phasing can weight cover towards the periods of genuine exposure. A provider given a start date and a gate can only supply a body.
The information worth sharing early is straightforward: the programme and its quiet periods, what high-value material and plant will be on site and when, the site boundary and its weak points, expected vehicle movements, neighbouring land use and access, and what the client or funder requires by way of reporting. From that, assignment instructions can be written for the specific site rather than adapted from a template.
Talking it through
If you have a site coming up, or one where the current arrangement is not working, we would rather look at the programme and the layout than quote from a schedule of rates. You can see the full range of construction site security services we provide, or get in touch directly on 020 4602 3974 or at sales@andorgroup.com.