Construction · ANPR
Chiltern Yard, Maidenhead — ANPR & site CCTV
A working builder's compound in Maidenhead — 0.8 acres, gated entrance, mixed sub-contractor traffic across a six-month groundworks programme. Two UniFi AI LPR cameras at the gate log every vehicle in and out; an AI 360 covers the material yard; four G5 Bullets cover the perimeter. Recording stays on a UDM Pro in a lockable site cabinet, with 4G failover during the first six weeks before the fixed line went in.
UniFi Dream Machine Pro2× AI LPR (gate ANPR)AI 360 (yard)4× G5 Bullet (perimeter)PoE Switch + 4G failoverDPIA + signage pack
The full story
The brief was blunt: the site manager was spending chunks of every Friday arguing about who was on site, when, and for how long. Sub-contractor invoices claimed days the gate log didn't show; the gate log was a clipboard in a portacabin that got filled in when someone remembered. Materials had started disappearing from the yard, and the compound had been walked twice out of hours in the month before we were called.
We designed the system around the gate. Two UniFi AI LPR cameras — one facing in, one facing out — capture every plate in both directions at site-traffic speeds, with the mounting angle and stand-off distance set during the survey so plate captures stay readable in headlight glare and rain. An AI 360 covers the material yard from a single ceiling mount on the storage barn, and four G5 Bullets cover the perimeter fencing. Everything records to a Dream Machine Pro in a lockable comms cabinet inside the compound — footage never leaves the site, and there is no monthly cloud subscription.
The first six weeks ran entirely on 4G failover because the fixed line hadn't been installed yet — recording is local, so the cameras don't care, and alerts still reached the site manager's phone over cellular. When the line went in, the system switched over without a visit.
Because workplace ANPR is personal-data processing, the install shipped with the paperwork done: a drafted Data Protection Impact Assessment, compliant signage at the gate, and a one-page summary of what is recorded, for how long, and who can view it — filed with the site's H&S documentation.
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