Temporary Fire Alarms for Construction Sites: Wireless Site Protection

What regulation and insurers expect on site

• CDM/HSG168 baseline: an effective means of raising the alarm, audible site-wide, from establishment — air horns suffice only on the smallest, simplest sites and die at first scale or noise
• Joint Code of Practice (JCoP — insurer-enforced on most contracts over thresholds): temporary alarm provision, hot-works regimes, escalating with project value — non-compliance jeopardises project insurance, which concentrates minds
• Timber-frame phases: detection (not just manual) expectations bite early — frame-stage fires write the case studies
• Occupied refurbs: maintaining building coverage while strip-out kills the permanent system — temporary detection bridges, sequenced with the works (the replacement-continuity principle from our replacement guide)
• Welfare/cabin complexes and stores: detection nodes where sleeping(!), cooking and charging concentrate — site fires start domestic
• Documentation: weekly test logs, layout plans updating with phases — the fire plan file your CDM audit and insurer's surveyor both open

The wireless mesh systems that own this niche

Purpose-built site systems (Bull/Cygnus-class) mesh wirelessly: combined call point/sounder units on stair cores and exits, heat/smoke detector nodes in cabins, stores and risk areas, base stations logging events — all battery-powered, IP-rated for site life, surviving relocation weekly and being craned about. Coverage walks with the build: nodes climb completed cores, detection follows fit-out into floors, the mesh self-heals around steel and concrete progress. Linkage options signal to site management phones or guard/ARC monitoring for out-of-hours (pairing naturally with the site security stack — towers and intruder nodes on the same operational rhythm). It's the only fire alarm category designed to be repeatedly dismantled — using anything else on a live site shows within a fortnight.

Hire vs buy and realistic budgets

Hire economics (defined projects): ~£10–£25/unit/week scaling with node type; a 15-unit mid-rise site runs £200–£350/week — expensed to the job, swapped/expanded per phase, maintenance included. Ownership (rolling contractors): units £300–£500 each buying repeat deployment across years — fleets amortise quickly past 12–18 months of cumulative hire (the same arithmetic as site alarms/towers; mixed owned-baseline + hired-surge fleets are common). Setup discipline either way: layout to the fire plan (travel distances to call points, sounder coverage vs site noise), weekly tests logged, phase-move revisions documented — we deploy, relocate and paper these across our region's sites, usually bundled with the security temporary works so the site has one out-of-hours number for everything that beeps.