ServicesIntruder Alarms
A1 Security Systems

Intruder Alarms

Grade 2 and Grade 3 intruder alarm systems, professionally installed and monitored by a NACOSS-approved ARC.

What this covers

An alarm that goes off and calls nobody is a noise box. Ours are linked to a monitoring centre that contacts your keyholder first and the police if needed. Every activation logged, every response documented.

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Grade 3 Detection

Wired and wireless sensors specified to your floor plan and risk profile. Insurance-grade, police-eligible, auditor-ready.

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Police URN Response

Confirmed activation routes directly to police with a Unique Reference Number. No delays from unverified false alarms.

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Hybrid Wireless Options

Wired backbone where possible, wireless sensors where needed. No compromise on detection in listed or difficult buildings.

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Dual Path Signalling

Primary and backup comms paths mean a cut line does not silence your alarm. Standard on every system we commission.

How We Work

01

Risk assessment

We identify all entry points, high-value areas, and the appropriate detector positions - including zones that are often overlooked such as skylights, internal doors, and plant rooms.

02

Grade specification

We confirm what your insurance policy and the police require, then specify the correct grade of panel, detectors, and communications.

03

Installation

Panel installation, detector positioning and sensitivity calibration, zone configuration, ARC linkage, and sounder placement.

04

Testing and commissioning

Every zone tested individually. ARC communication confirmed. Keyholder cascade verified. We do not sign off until everything works.

05

NSI certification

We issue your NSI certificate and register the police URN where required, so your system is compliant on day one.

Intruder Alarms installation

What's Included

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Professional Installation

  • check_circleConducted by vetted, qualified engineers
  • check_circleCompliant with British Standards
  • check_circleTested and certified on handover
  • check_circleFull cable management included
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Ongoing Support

  • check_circle24/7 technical helpline
  • check_circleRemote diagnostics where possible
  • check_circlePlanned maintenance contracts available
  • check_circleEmergency call-out response
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Full Documentation

  • check_circleAs-built installation records
  • check_circleWarranty certificates on all hardware
  • check_circleCompliance documentation pack
  • check_circleInsurance-ready certification

Common Questions

What is the difference between Grade 2 and Grade 3?

Grade 3 is designed to resist a more determined attack - higher-specification panels, stronger tamper protection, and more robust detector requirements. It is required in some insurance policies for higher-risk premises. We will tell you what your specific situation actually needs, not just quote the higher grade to justify a bigger installation.

Do I need ARC monitoring?

If you have valuable stock, a vulnerable site, or an insurance requirement for monitored response, yes. An alarm that alerts nobody with decision-making authority is not adequate commercial security. ARC monitoring costs less than most people expect - from a few pounds a week, depending on the level of response.

What happens when there is a false alarm?

We investigate the cause. Most false alarms come from detector sensitivity set too high, spiders on passive infrared sensors, or user error on set and unset. We address the cause rather than just resetting and moving on.

Can the alarm link to our CCTV system?

Yes. We configure the alarm so a zone trigger automatically switches relevant cameras to full resolution recording and flags those feeds to the ARC operator. That is how verified response works - the operator sees what is happening before deciding whether to deploy police.

Ready to discuss intruder alarms?

Our engineers will visit your site, assess your requirements, and give you a straight written quote. No pushy sales calls.