Construction Site Alarms: Wireless Towers, Plant Protection and Hire Options

What site alarms protect, phase by phase

• Cabins and welfare: tool stores and site offices — door nodes + internal PIRs, armed nightly via fob/app by the last supervisor out
• Containers and compounds: high-value consumables (cable drums, copper, fixings) — contacts on container doors plus compound beam/PIR lines
• Plant and fuel: machine cab nodes, fuel-point detection, plus immobilisation/tracking as parallel disciplines — alarm covers the approach, hardware covers the asset
• Scaffold and shell phases: wireless nodes climb with the build (stair cores, floor access points) where towers can't see inside
• Voids-to-handover: the finishing-trades phase (boilers, kitchens, copper in walls) is peak internal-theft season — internal coverage matters most exactly when the shell looks 'done'
• All battery/4G: no mains dependence, no broadband, survives the site's own chaos

Monitoring, response and the insurance angle

Site alarms earn through response architecture: 4G signalling to ARC operators who action verified events (paired tower/camera verification where deployed — the combination is the product), keyholder/guard-response chains agreed per site, and audit logs feeding both CDM security duties and insurer files. Underwriters of contractors' all-risk and plant policies respond concretely to documented detection+response: conditions met, excesses and premiums negotiated from evidence — the deployment records and event logs are the currency. Sequence with our tower guide: towers watch compounds and perimeters; alarm nodes cover the interiors and containers towers can't see — one monitored account, whole-site coverage.

Hire vs own and realistic pricing

Hire economics suit defined builds: systems at ~£25–£60/week (node count dependent) with monitoring options, relocations and swap-outs included — a 30-week build runs £750–£1,800, expensed cleanly against the job. Ownership suits rolling portfolios: contractor-owned kits redeploy site-to-site (we manage re-commissioning per move) and amortise across years — typically winning past 12–18 months of cumulative hire. Mixed fleets are common: owned baseline + hired surge for big phases. Mobilisation reality: ordered today, protecting tonight is regularly achievable in our coverage area — end-of-day handover calls are a Friday tradition. Package with towers, temporary fire alarms (see the construction security page) and signage, and site security becomes one supplier, one invoice, one number when something moves at 2am.