Number-plate recognition at the site gate is the single most useful camera a builder's compound can have — and it's also the one that creates legal obligations most site managers have never been told about. Here's the plain-English version of what UK law requires when you run ANPR on a construction site, and who should be doing the paperwork.

Why ANPR on a building site counts as personal data

A registration plate identifies a person (the registered keeper), so under UK GDPR, capturing and storing plates is processing personal data. The moment your gate camera logs plates — even just for attendance records — you're a data controller with real obligations. The same applies to ordinary workplace CCTV; ANPR just makes it unambiguous.

The five things the ICO expects

  • ICO registration. Almost every business processing personal data must be registered with the Information Commissioner's Office and pay the data protection fee. If your firm isn't registered, that comes first.
  • A lawful basis. For site security and attendance evidence this is usually "legitimate interests" — but it has to be identified and written down, not assumed.
  • A Data Protection Impact Assessment (DPIA). ANPR is exactly the kind of systematic monitoring the ICO says needs a DPIA before you switch it on: what's captured, why, the risks, and how they're mitigated.
  • Compliant signage. Clear signs at every entrance telling people CCTV and ANPR are in operation, who runs it, and how to contact them. A faded generic "CCTV in operation" sticker doesn't meet the standard.
  • A retention policy you can point at. Keep footage only as long as you can justify — and be able to say what that period is when a sub-contractor, employee or the ICO asks.

Who actually does all this?

On most sites, nobody — which is the problem. The camera installer says it's the client's responsibility, the client assumes the installer handled it, and the paperwork doesn't exist until there's a subject-access request or a complaint.

Our position is simpler: if we install ANPR on your site, the paperwork is part of the install. We draft the DPIA, supply compliant signage for every entrance, and hand over a one-page record of what's recorded, for how long, and who can see it — ready for your H&S file. That's baked into our construction packages, not sold as an extra.

Done right, it's an asset, not a liability

A compliant ANPR setup gives a Thames Valley site manager a searchable, timestamped log of every vehicle through the gate — attendance evidence for sub-contractor invoicing, an audit trail for H&S, and out-of-hours intrusion alerts, all recorded on your own kit in the site cabinet rather than someone else's cloud. On a working compound in Maidenhead that log resolved two billing disputes in an afternoon.

Running a site in Marlow, Maidenhead, High Wycombe or anywhere across Buckinghamshire and Berkshire? Read how our AI camera systems work, or get a quote with the compliance paperwork included.