VALOROUS
GROUP

Security Systems ↗

Home/Security Systems/Intruder Alarm

Security Systems

Intruder Alarm Systems for Homes and Estates

An intruder alarm system is a monitored network of detectors, door contacts, motion sensors, glass-break detectors, perimeter beams and vibration sensors, that identifies unauthorised entry to a property and routes the alert to a defined responder. Valorous designs, specifies and integrates intruder alarm systems for principal residences and country estates, built against PD 6662 and BS EN 50131, delivered by NSI or SSAIB-accredited installers, and monitored by a defined alarm receiving centre.

Arrange a secure briefing ↗Security Systems ↗

What "monitored" and "graded" actually mean

A monitored alarm is one that routes to a professional alarm receiving centre (ARC), not to the homeowner's phone alone. When a detector activates, the signal goes to the ARC, an operator verifies the alarm against agreed protocols (video verification, sequential confirmation, call-out procedures), and the response, residential team, keyholder, police, is triggered.

Grading refers to the risk profile the system is designed for, under PD 6662 and BS EN 50131. Grade 3 is the standard for premises with a high risk of intrusion; grade 4 is reserved for the highest-risk environments. Most estates warrant grade 3 as a floor. Valorous specifies the grade against the property's actual risk, not against a template.

Components of a Valorous intruder alarm specification

  • Perimeter detection, door and window contacts, glass-break detectors, vibration sensors on vulnerable glazing.
  • Volumetric detection, motion sensors inside, tuned to family and pet behaviour to minimise false alarms.
  • External detection, beam systems, thermal detection or buried cable across estate perimeters where the property warrants it.
  • Panic points, hardwired panic buttons at key positions, silently routing to the ARC and the residential team.
  • Control equipment, a graded control panel from a named manufacturer (Honeywell, Texecom), with dual-path signalling so a single point of failure cannot silence the system.
  • Video verification, cameras positioned to confirm activations, letting the ARC and any responder distinguish false alarms from genuine incidents in seconds.
  • Integration, with access control, CCTV and the residential-team interface so an alarm is not a message in isolation.

Police response and the URN

A monitored alarm can hold a police response, but only if it holds a Unique Reference Number (URN). URNs are issued by the local police force under the NPCC response policy, and they require compliance with specific installer, monitoring and false-alarm criteria. If the alarm generates repeated false activations, the URN can be withdrawn, meaning the police no longer respond.

For most estates the primary response is a residential security team or a defined keyholder service. Where a URN is warranted, Valorous specifies the system, installer and ARC against police criteria and manages the URN application on the client's behalf.

How Valorous delivers intruder alarm systems

Every specification begins with a property walk, perimeter, entry points, glazing, internal risk zones and existing systems. We define the grade, specify the detection, cabling, control panel and ARC, and manage installation through an NSI or SSAIB-accredited installer. Post-installation we hold the maintenance schedule, monitor performance against agreed metrics (false-alarm rate, response times) and rework the specification as the estate changes.

In practice

Client scenarios.

A country estate with a chronic false-alarm problem. Previous installer had specified motion sensors that triggered on cats, foxes and building movement. Valorous re-specified with dual-technology sensors, tuned the zoning to family and staff behaviour, and rebuilt the ARC protocol. False-alarm rate fell to near zero in six weeks.

A London townhouse ahead of an extended overseas trip. Full alarm audit, upgraded to grade 3 with perimeter and glazing detection, video verification through the estate CCTV, and an ARC protocol including a hard escalation to the residential team and keyholder. Family travelled with a written report of the system's state.

A multi-property portfolio. Three properties on three separate systems, three separate ARCs, three separate maintenance contracts. Valorous consolidated to one specification, one installer, one ARC and one maintenance schedule. Total ongoing cost fell; operational visibility improved.

Standards

Standards & credentials.

  • PD 6662 and BS EN 50131 applied to every intruder alarm specification.
  • NSI or SSAIB-accredited installers on every mandate.
  • NPCC / URN application and management where police response is warranted.
  • Named manufacturers: Honeywell, Texecom for control equipment; independent detector selection.
  • Dual-path signalling as a specification default for mandates.
  • False-alarm management, Valorous tracks activations, causes and response and reports quarterly.
FAQ

Frequently asked questions.

What is a monitored intruder alarm?
A monitored intruder alarm is a system that routes its activations to a professional alarm receiving centre (ARC) rather than only to the homeowner's phone. When a detector triggers, an ARC operator verifies the alarm against agreed protocols and initiates the defined response, residential team, keyholder or, where a URN is in place, police. Monitoring is the difference between an alarm that shouts into an empty room and one that produces an actual response.
What is an alarm receiving centre (ARC)?
An ARC is a professional monitoring facility, staffed 24 hours a day, that receives signals from monitored alarms and initiates a defined response. UK ARCs are typically certified against industry standards and are the intermediary between the alarm system and the responder, police, private security or keyholder. For estates the ARC's job is not just to make a call; it is to verify the alarm and coordinate the response protocol Valorous has written for that property.
What is a grade 3 or grade 4 alarm system?
Grading under PD 6662 and BS EN 50131 describes the risk profile a system is designed to withstand. Grade 3 is designed for premises with a high risk of intrusion by an attacker with some knowledge of alarm systems; grade 4 is designed for the highest-risk environments and expects a determined, knowledgeable attacker. Most estates are specified at grade 3 as a floor; grade 4 is reserved for genuinely high-threat mandates.
How do I get police response to my alarm (URN)?
To trigger police response to a monitored alarm in the UK, the system needs a Unique Reference Number (URN) issued by the local police force. URNs require an installation to specific standards (typically PD 6662 grade 3 or above), monitoring by an approved ARC, and adherence to false-alarm criteria under the NPCC response policy. Valorous manages URN applications and maintains compliance for the client.
How much does a professional intruder alarm cost in the UK?
Costs vary widely with scope, risk profile and specification, so we do not publish fixed prices. Valorous works to a transparent commercial model, what pays for the work and what pays for the governance is agreed in writing before anything begins, and you receive a clear, itemised proposal after a confidential discussion.
What is perimeter intrusion detection?
Perimeter intrusion detection is the layer of alarm technology that identifies an intruder before they reach the building, beam systems, buried cable, fence-line vibration detection, or thermal cameras positioned across the boundary of an estate. It buys time. On a country estate a properly designed perimeter can give a residential team several minutes' warning; without it, the first alert may not come until an intruder is at the door.
Do intruder alarms in the UK need certification?
For police response and insurance recognition, yes. Monitored alarms holding a URN must be installed by an NSI or SSAIB-accredited installer, meet the appropriate grade under PD 6662 / BS EN 50131, and be monitored by an approved ARC. Insurers frequently require certified installation as a condition of high-value cover. Valorous only specifies against accredited installers, and holds documentation for the client.
Can the intruder alarm integrate with CCTV and access control?
Yes, and on any well-designed mandate it should. Integration means an alarm activation immediately pulls the relevant camera feeds for the ARC and residential team to verify, and correlates against access-control events (was anyone credentialed at the door?). Verified alarms produce faster, better response and much lower false-alarm rates. Valorous specifies integration as a default, not an option.
Confidential by design

Speak with us in confidence.

If you are commissioning, upgrading or auditing an intruder alarm system for a property, we will meet in person, walk the perimeter with you and discuss the requirement. Every enquiry is handled directly by a Valorous director and covered by a mutual non-disclosure agreement from first contact.

Arrange a secure briefing ↗+44 (0)20 3858 8008
Explore

Related services.

Security Systems ↗
CCTV / Camera Systems ↗
Access Control ↗
Residential & Estate Security ↗
TSCM ↗
Physical Protection ↗