By the DC Fire & Security engineering team — installing and maintaining fire and security systems since 2010. Updated June 2026.
Comparable fire alarm quotes state the BS 5839 category being designed to (L1–L5/M/P), name the panel and every device, include design/installation/commissioning certificates, zone plan and cause-and-effect documentation, and say who carries design responsibility. A cheaper quote omitting category or commissioning isn't cheaper — it's a different (non-compliant) product.
Two fire alarm quotes can differ 2–3× while both being 'for the building' — because they're often for different categories (an M-plus-escape-routes L4 against a near-L1), different responsibility models (designed system vs 'we fitted what you asked for', which transfers liability to you), and different ends (commissioned-and-certificated vs powered-up-and-left). The Fire Safety Order makes the responsible person liable for adequacy: the documentation trail — category decision flowing from your fire risk assessment, certificates, zone plan — is what stands between you and that liability when an inspector or insurer asks. Cheap without paperwork is expensive with consequences.
Level the field: send each bidder the same brief — the fire risk assessment's detection requirement (or ask each to state the category they propose and why), building drawings, and interface list (door holders, AOVs, kitchen suppression). Then compare like-for-like: same category, same certification deliverables, five-year view including the twice-yearly servicing (£200–£900/yr by size — see the servicing guide). Weight the soft signals: surveyors who measure and ask about sleeping risk vs drive-by quoters; willingness to coordinate with your assessor; takeover honesty about your existing system. We quote to this checklist structurally — and we'll annotate competitors' quotes against it without drama, because the gaps are usually visible in one read.
We install and maintain fire and security systems across Bedfordshire, Hertfordshire and London — with fixed written quotes, a 36-month warranty, and certification your insurer will accept.
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