Construction sites are temporary, open and full of portable value: excavators, generators, tools, cable and copper. They are busy by day and empty at night. A drone-in-a-box brings a resident patrol drone and an on-site control system that can be moved to the next project. Nestua's software platform is functional in development builds; the drone and base station hardware are still being built.
- The European Rental Association estimates €1.5 billion a year in theft and vandalism damage across construction, rental and agriculture in Europe.
- Site layouts change weekly, which defeats fixed camera plans.
- A drone can patrol out of hours and check alarms; it does not replace fencing, immobilisers or a response service.
- Workers on site make GDPR, staff information and, in some countries, works council approval part of the plan.
How big is theft from construction sites in Europe?
The European Rental Association (ERA) published a Theft and Vandalism Prevention Guide in August 2025. It estimates that theft and vandalism cause about €1.5 billion of damage a year across the construction, rental and agricultural sectors in Europe. The rental industry alone loses over €500 million a year. More than 30,000 heavy machines and 300,000 smaller items are stolen every year.
The cost goes beyond the stolen item. A missing excavator or generator can stop a programme, and copper cable stripped from a building before handover means rework.
Why do fixed cameras and guards leave gaps on building sites?
- The site keeps changing. Scaffolding, stockpiles, cabins and new structures appear every week and block camera views that were fine a month ago.
- Temporary infrastructure. Power and network on site are provisional, and tower cameras need power, mounting and repositioning.
- Guarding cost. Night and weekend guarding for the full programme is expensive. A single guard cannot cover a large linear site such as a road, rail or pipeline project.
- Alarm fatigue. Wind-blown sheeting and animals trigger alarms, so remote video verification matters.
How would a drone-in-a-box patrol work on a construction site?
One Nestua edge node controls one drone. The site manager or a monitoring centre uses a browser cockpit, which can also be installed as an app. It shows a live map with the drone's position, heading and trail, satellite imagery, and mission and geofence overlays.
- Routes that follow the programme. In the mission editor, you redraw waypoint routes as the site evolves: plant compound, material laydown, cabins, fuel bowser, perimeter hoarding. You upload, start and stop them from the browser. Each change is audited.
- Out-of-hours schedule. Time-window policies limit flights to nights and weekends, when the site is closed.
- Geofences for cranes and neighbours. Polygon or circle no-fly zones can exclude tower crane areas, adjacent homes, public roads and rail lines. A breach blocks the command or triggers return-to-launch. Tower cranes and temporary structures move, so the geofence plan needs updating with the site.
- Alarm checks. When a perimeter alarm fires, the operator sends the drone to the location with a go-to command. Low-latency WebRTC video plays in the browser, with HLS as a fallback. Commands count only after the drone's MAVLink acknowledgement, and critical commands need typed confirmation.
- Detection rules. YOLO-based person and vehicle detection runs on the NPU of the on-site NXP i.MX 8M Plus edge computer. Rules can notify, record, hover over the detection or return to launch, within safety policy and geofences. The system detects object classes; it does not identify individuals.
- Evidence. Local ring-buffer recording with clip export, plus an exportable event journal for insurers and the police.
Why does offline-first matter on a construction site?
Sites often start before fixed broadband arrives, and temporary LTE routers are easy to unplug or jam. Nestua runs the full control plane on the edge node, including flight control, missions, geofences, video, detection and audit, so patrols continue without internet. A weather-monitoring service and watchdog-supervised services feed the system health page.
Recordings are not uploaded off-site unless you enable it. Remote access is disabled by default. A contractor with several sites can link them through the optional cloud as a fleet, with MFA or SSO for users. See offline-first security drones.
What rules apply to drones on construction sites with workers?
- Workers and GDPR. The EDPB notes that employees at work generally do not expect to be monitored. Employers should in most cases not rely on consent, and Member State law or works agreements may add rules (GDPR Article 88). Contractors and subcontractors on the same site make the controller question more complex. Settle it in writing.
- Works councils. In Germany, introducing technical devices designed to monitor employee behaviour or performance is subject to works council co-determination (§ 87(1) no. 6 BetrVG). Other countries have their own consultation duties.
- People on the ground. EU rules distinguish uninvolved persons, defined as people not taking part in the operation or not aware of the operator's instructions and safety precautions (Regulation (EU) 2019/947, Article 2). The safest approach is to fly when the site is closed.
- Authorisation. Automated beyond-visual-line-of-sight patrols normally need a specific-category operational authorisation based on a risk assessment (Articles 5 and 11). Urban sites may also sit inside national geographical zones. In Germany, for example, § 21h LuftVO restricts flights over residential properties. See EU drone regulations.
- Neighbours. The EDPB advises that cameras protecting premises should generally not watch neighbouring property or public areas.
This page is general information, not legal advice.
What should a contractor evaluate?
- Which project types justify a drone, typically large, long-running or linear sites.
- Base station power, mounting and relocation between projects or phases.
- Flight time, night imaging, and wind and rain limits. Ask for evidence.
- How geofences will be kept current as cranes, scaffolding and neighbours change.
- The link to your monitoring centre and response service.
- The DPIA, information for workers and subcontractors, and the works council agreement.
- The authorisation route and who acts as UAS operator: the contractor or a security provider.
Sources
- European Rental Association, Theft and Vandalism Prevention Guide, Aug 2025: erarental.org
- EDPB Guidelines 3/2019 on processing of personal data through video devices, paras. 37, 47–48: edpb.europa.eu
- Regulation (EU) 2016/679 (GDPR), Arts. 35 and 88: eur-lex.europa.eu
- German Works Constitution Act (BetrVG), § 87: gesetze-im-internet.de
- Commission Implementing Regulation (EU) 2019/947, Arts. 2, 5, 11, 15: eur-lex.europa.eu
- German Air Traffic Regulation (LuftVO), § 21h: gesetze-im-internet.de