Updated August 2026 · 4 min read
Why construction sites need protection
Construction sites combine high asset value with weak protection: machinery, tools, fuel and cables, copper in particular, are quick to remove and hard to trace. The real damage is usually not the material value but the standstill: if the equipment is gone in the morning, the trade stops working.
Add to that the duty to maintain safety (Verkehrssicherungspflicht): whoever operates a site must take the precautions that are necessary and reasonable under the circumstances so that unauthorised persons, children above all, for whom construction sites hold a well-known attraction, do not come to harm. If something happens, the responsible party can be held liable. In practice, a fence alone stops neither thieves nor curious visitors.
The building blocks of site security
Site security is a modular system. The right combination depends on location, construction phase and asset value:
- Basic protection: a solid site fence, lighting, clear signage. The foundation, but no substitute for checks.
- Mobile patrol: checks the site several times a night at varying times. The economical entry point for most projects.
- Permanent post: continuous guarding during critical phases, for example after delivery of expensive technology.
- Access control: ID and visitor management at the gate. Often required on large sites anyway.
- Mobile video surveillance: solar-powered surveillance towers with cameras secure open areas around the clock, even where there is no power supply.
- Alarm response: alerts converge in a staffed 24/7 operations centre that dispatches a patrol and documents the incident.
What drives the costs
Reputable providers quote a price only after a site visit, because costs depend on a few clearly identifiable factors: deployment hours (night, weekend and public holiday supplements), project duration, required staff qualification and the location of the site.
The combination is often the most economical: technology monitors the area continuously, staff come in deliberately, as a patrol or for alarm response. Beware of strikingly low hourly rates: security staff are generally subject to binding collectively agreed wages. Anyone offering far below that is often saving on qualification or social contributions, a risk for the client if damage occurs.
How to recognise a reputable provider
- Licensing under § 34a GewO. The legal prerequisite for guarding duties.
- Verifiable certifications, such as ISO 9001:2015 (quality management) and DIN 77200 (security services).
- Documented patrol rounds, e.g. via NFC checkpoints with timestamps instead of mere promises.
- A continuously staffed operations centre you can reach at night.
- References from the construction and infrastructure sector.
This article provides general information and does not replace legal advice. In individual cases, the requirements of authorities, fire brigade and insurers prevail.