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Construction site theft: how to protect a project

A construction site is protected when security covers the hours the site stands empty — nights, weekends, gaps between phases — with a closed perimeter and lighting, access control for every contractor, the right mix of static guarding, patrols and remote monitoring, and a record of every delivery and every incident. And because the site changes every month, the cover has to change with it.

Updated: 7 min readSources: 3

What usually gets stolen from a construction site?

Four categories: materials, tools, fuel and plant or its parts. Each is stolen in a different way and protected in a different way.

  • Materials: anything easy to resell — copper, cable, metal sections, plumbing and electrical items before installation. They are most at risk while they wait on the ground.
  • Tools: small, expensive and portable; they often go without any break-in, because nobody checks who leaves with what.
  • Fuel: from tanks and from machine fuel tanks, usually at night.
  • Plant and parts: generators, small machines, batteries, components taken from large machines.

The cost is not only the item’s value: a stolen cable or a disabled machine can stop a crew and push back the programme. So protection starts with an inventory: what is on site this week and where it is kept.

When is a construction site most at risk of theft?

When it is empty: nights, weekends, public holidays and the gaps between phases or contractors. On a typical working schedule those hours are about two thirds of the week.

If the site works Monday to Friday, 07:00–18:00, it is staffed 5 × 11 = 55 hours a week. For the other 168 − 55 = 113 hours nobody is working there — and 61 of them run without a break, from Friday evening to Monday morning.

  • Nights: darkness, nobody on site, noise that no one hears.
  • Weekends and public holidays: the longest unbroken gap; a theft may only be found on Monday.
  • Between phases: when one contractor leaves and the next has not arrived, nobody is in charge of the site.
  • After a large delivery: materials on the ground before they are installed or locked away.

A post covered around the clock is 168 hours a week — on Greece’s 40-hour full-time week (Labour Code, art. 189), at least 4.2 full-time positions. The 113 out-of-hours alone are already 113 ÷ 40 ≈ 2.8 positions.

How do I secure the perimeter of a construction site?

With continuous fencing and no gaps, a few gates that lock, and lighting on the perimeter, the gates and the storage areas. A perimeter does not stop every intrusion; it slows it down and makes it visible.

  • Fencing: continuous and checked daily — an opening made for one delivery often stays open.
  • Gates: as few as possible, locked, with a named person responsible for opening and closing.
  • Lighting: perimeter, gates, stores and plant parking; no shadows behind stacks of material.
  • Storage: a lockable container for tools and valuable materials, away from the fence line.
  • Plant: parked together in a lit area, with no keys left in it.
  • Fuel: a locked tank and a refuelling log, so consumption can be compared with machine hours.

OVIT starts each project with a perimeter survey: site boundaries, power availability, blind spots and high-value storage zones (worksite security).

How do I control who enters a construction site?

With one list of authorised contractors, people and vehicles, a record of every entry and exit at the gate, and a simple rule: if you are not on the list, you do not come in. Access control protects against theft and against the stranger nobody can explain.

  • Access list: which companies are working this week, which people and which vehicles, kept up to date by the project manager.
  • Gate log: name, company, time in and out, vehicle.
  • Identification: a card or marking that shows which contractor each person belongs to.
  • Leaving with materials or tools: only with written approval from the project manager.
  • Keys: who holds which key, and handed back when the contractor finishes.

The list changes with the project: when a contractor finishes, they come off the list the same day. What the gate records is personal data, so agree from the start who manages it and how long it is kept.

Static guard, patrols or remote monitoring for a construction site?

A static guard suits a site with a busy gate or high-value materials on site; patrols suit a smaller, lower-risk site; remote monitoring with cameras suits a large site that needs a constant picture. Most projects need a mix that changes from phase to phase.

  • Static guard: constant presence, gate and delivery checks, immediate response. Takes the most hours.
  • Patrols: visits at varying times with logged checkpoints. Fewer hours, but between visits nobody is there.
  • Remote monitoring: cameras watched from a control room. Needs power and connectivity on site, and a plan for who goes when something is detected — a patrol or the police.

Site cameras follow the rules for any video surveillance in Greece: clearly visible signs before the camera’s range, naming the controller, the purpose and whom to contact about data-subject rights (DPA Directive 1/2011, art. 12); deletion within 15 working days at most if no incident occurs (art. 8); and no use to monitor or evaluate workers (Hellenic Data Protection Authority, art. 27 of Law 4624/2019).

For construction sites, OVIT designs turnstile access, mobile CCTV towers and patrol response to suit the project. In the Guardly platform the client sees patrols, incidents and reports in one live picture.

How do I record material deliveries and incidents on a construction site?

Log every delivery at the gate with the time, supplier, vehicle and delivery note, and count it before anyone signs. Record every incident when it is found, with photos and the actions taken.

  • Time and vehicle: when it arrived, which driver, which registration.
  • Delivery note: what is declared, checked against the order.
  • Count: what was actually received, and who counted it.
  • Photo: the load and where it was stored.
  • Signature: who received it on behalf of the project.

For incidents — break-in, theft, a cut fence, an unknown vehicle — record the time, place, what was found, photos, who was told and whether the police were called. The record serves the police, the insurer and the conversation with contractors; a Saturday incident written up on Monday has already lost detail.

A delivery that was never counted cannot later be proven stolen. The first gap in the chain is often at the gate, not in the night.

How should site security change as the project progresses?

Review the cover at every change of phase: what materials are on site, how many contractors come in, how closed the building is. A set-up that suits excavation does not suit the M&E fit-out.

  • Excavation and foundations: heavy plant and fuel; focus on the perimeter, lighting and keys.
  • Structure: rebar and steel on the ground, many lorries; focus on the gate and deliveries.
  • Services and finishes: cable, copper, equipment and appliances inside the building; focus on floor-by-floor access control and nights.
  • Before handover: the building is nearly finished and empty; the risk lasts until the owner takes it over.

Agree from the start that cover is reviewed at every programme milestone, with the previous phase’s incidents on the table. Request a proposal for your project.

At a glance

  • Materials, tools, fuel and plant are stolen in different ways — start from an inventory of what is on site and where.
  • A site working 07:00–18:00, Monday to Friday, stands empty for 113 of the week’s 168 hours.
  • Continuous fencing, few gates, lighting and locked storage come before every other measure.
  • Nobody enters who is not on the access list; every delivery is counted and signed for at the gate.
  • Review the cover at every phase of the project.

Frequently asked questions

How many guards does 24-hour construction site security take?

One post around the clock is 168 hours a week: at least 4.2 full-time positions on a 40-hour week, before leave and cover. Guarding only the 113 out-of-hours takes about 2.8.

Are cameras without a guard enough for a construction site?

Only if there is a plan for who goes to the site when a camera detects something — a patrol or the police. A camera sees; on its own it does not stop a theft.

Do construction site cameras need a sign?

Yes. The Hellenic Data Protection Authority’s Directive 1/2011 requires clearly visible signs before the camera’s range, naming the controller, the purpose and whom to contact about data-subject rights.

Sources

Every legal or pay point in this guide was checked against the official sources below.

  1. Αρχή Προστασίας Δεδομένων Προσωπικού Χαρακτήρα — Βιντεοεπιτήρηση: εισαγωγή (Οδηγία 1/2011, GDPR, ν. 4624/2019 άρθρο 27)Checked
  2. Οδηγία 1/2011 της ΑΠΔΠΧ για τη χρήση συστημάτων βιντεοεπιτήρησης — άρθρα 8 (χρόνος τήρησης) και 12 (ενημέρωση με πινακίδες)Checked
  3. Κώδικας Εργατικού Δικαίου (π.δ. 62/2025), άρθρο 189 — πλήρης απασχόληση 40 ωρών εβδομαδιαίωςChecked

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