Best Wireless Alarm Systems UK: A Trade Buyer's Guide

INTRUDER ALARMS GUIDE  |  Harbro Electrical

Wireless intruder alarms have become the default choice for homes and businesses across the UK. No chasing cables, no plaster damage, and with today's 868MHz professional hardware, reliability matches or exceeds traditional wired installations for the vast majority of properties.

But the market is crowded, the terminology is confusing, and the gap between a £200 DIY kit and a £1,200 professionally installed security system is not just about price - it is about police response, insurance validity and the standards that separate a genuine security system from a box that makes noise.

This guide cuts through all of it. Whether you are a homeowner researching your options, a business owner specifying a system or a trade electrician looking to add alarm supply to your jobs, you will find clear answers here.

At Harbro Electrical we supply professional-grade wireless alarm components and kits from Pyronix, Hikvision and Dahua at ex-VAT trade prices, with free UK mainland delivery on orders over £70. Everything in this guide links back to what you can actually buy and specify from a UK trade wholesaler.

How a Wireless Alarm System Works

A wireless alarm works by having battery-powered sensors send encrypted radio signals - typically on the 868MHz band in the UK - to a mains-powered control hub. When armed and a sensor triggers, the hub activates internal and external sirens, sends app notifications, and can transmit the alarm to a monitoring centre via Wi-Fi, Ethernet or cellular.

The process from trigger to response happens in seconds:

1. A sensor detects movement, an opened door, or a broken window contact

2. The sensor transmits an encrypted signal to the control hub

3. The hub checks whether the system is armed; if it is, it starts the alarm sequence

4. The internal sounder activates immediately; the external bell box follows after the entry delay (if triggered from an entry route)

5. The hub simultaneously pushes a notification to the app, dials keyholders (if a GSM dialler is fitted) or sends a signal to the Alarm Receiving Centre (ARC) over the internet or cellular path

6. If ARC-monitored, an operator verifies the alarm, contacts keyholders and - if the system has a police Unique Reference Number (URN) - requests a police response

The key difference from a wired system is not the logic but the communication path between sensors and hub: radio instead of cable. Everything else - the grading, the response, the standards - works the same way.

The Components of a Wireless Security System

Understanding the components makes specifying a system straightforward. A complete wireless alarm installation typically includes:

Control Panel / Hub

The brain of the system. Mains-powered with a sealed battery backup (typically 24 hours), it receives signals from all sensors, manages arming and disarming, and handles all outbound signalling. Professional hubs connect via Ethernet and Wi-Fi with a cellular SIM as the tertiary backup path - meaning a cut phone line or broadband failure does not silence the system.

PIR Motion Detectors

Passive Infrared sensors detect the heat signature and movement of a human body passing through their field of view. Quality pet-immune PIRs use shaped detection zones and temperature-discrimination logic to filter out animals up to a specified weight (typically 36kg for top-tier detectors). Dual-technology PIRs add a microwave detection layer to further cut false activations.

Door and Window Contacts

Magnetic reed contacts fit to the frame and the leaf of a door or window. When the gap between the two parts exceeds a threshold - the door opens - the circuit breaks and the sensor signals the hub. Simple, reliable and the first line of defence at any point of entry.

Keypad

The arming and disarming interface. Users enter a code or present a proximity tag to arm the system in Away or Stay (part-arm) mode. Professional keypads display zone statuses, fault conditions and system information, and most support multiple user codes with different access levels.

Internal Siren / Sounder

A high-decibel siren (typically 85 to 110 dB) fitted inside the premises. Its primary job is to alert occupants and neighbours, deter an intruder already inside and provide a tamper-protected local alarm even if signalling to the ARC fails.

External Bell Box

The weatherproof enclosure on the outside of the building containing a siren and a strobe. Provides a visible deterrent before any incident and continues to sound during an activation. Must be tamper-protected and fitted with a battery backup so it functions even if the main power supply is cut.

Keyfobs and Proximity Tags

Optional accessories for arm/disarm without using the keypad. Keyfobs also often carry a panic button for a personal attack signal.

Glass-Break Detectors and Shock Sensors

Acoustic glass-break detectors listen for the characteristic frequency signature of shattering glass, covering multiple windows in one device. Vibration/shock sensors mount on the glass or frame itself and detect impact.

Panic Buttons

Fixed or portable. Fixed units are common in reception areas and retail premises; portable (wireless) panic fobs allow lone workers, vulnerable occupants or staff to raise a personal attack alarm from anywhere on site.

Signalling and Monitoring Path

• App / self-monitored: push notification to a smartphone; no monthly fee; no ARC; no police URN
• GSM/GPRS dialler: calls or texts a list of keyholders automatically; no ARC; no police URN
• ARC-monitored (single path): signal to a 24/7 Alarm Receiving Centre via broadband
• ARC-monitored (dual path): broadband primary + cellular backup - the standard for Grade 2/3 police-response systems
• Police response: requires ARC monitoring + confirmed alarm technology + a URN obtained by an NSI/SSAIB-accredited installer

Wired vs Wireless Alarms: What Trade Electricians Need to Know

The honest answer is that neither is universally better. Both have their place, and for most domestic retrofits and small commercial jobs, wireless wins on installation speed, cost and disruption. Here is the full picture:

On jamming: it is the most common objection to wireless and the least well-founded. Professional 868MHz systems use AES-128 encryption, two-way communication (so the hub knows within seconds if a sensor stops responding), frequency hopping and built-in jamming detection. Any jamming attempt triggers a tamper alert to the monitoring centre. Most burglaries at alarmed premises last under two minutes - attempting to jam a professional system before forcing entry is impractical.

Forum consensus from UK installers: wireless installation is widely described as "beyond simple" - scan a QR code, stick the sensor, done. The installer community's shorthand is "always hard wired first, wireless second" for signal-critical doors or high-risk zones, but for the vast majority of domestic jobs, a well-specified wireless system is fully appropriate.

Types of Alarm System: From Bells-Only to Police Response

Understanding the four response tiers is the most important part of specifying any security system.

Bells-Only (Unmonitored)

A siren sounds on activation. Nobody is contacted automatically. The system relies on neighbours hearing the bell and either calling the police themselves or deterring the intruder by noise alone. Cost-effective for lower-risk properties and rental situations. A bells-only system cannot receive a police URN regardless of how it is installed.

GSM/GPRS Speech Dialler

The hub automatically calls or texts a pre-programmed list of keyholders when the alarm activates. No monthly contract. No ARC. Useful for remote properties (barns, outbuildings, storage units) where a neighbour notification is not practical. Important: never programme a police number into an auto-dialler - it is illegal to send automatic calls to the emergency services.

Self-Monitored / App-Connected

The hub sends push notifications to a smartphone when the alarm activates. The owner decides whether to investigate or call the police. No monthly fee. No ARC. No police URN. Brands like Yale and Ring all offer this model. Appropriate for lower-risk properties or as a supplement to a professionally monitored system.

ARC-Monitored

The alarm signal routes to a 24/7 Alarm Receiving Centre staffed by trained operators. On receiving an activation, they follow a contact list - keyholders first, then escalation - and can request a police response if the system has a URN. Dual-path signalling (broadband + cellular) is the standard for any monitored system. Monthly fees vary by ARC.

Police Response (Confirmed Alarm)

The highest tier. The ARC verifies the alarm using confirmed alarm technology - either sequential zone triggering (two detectors in sequence), audio confirmation or video verification - before requesting police attendance. Requires:

• A system conforming to PD 6662:2017 and BS 8243:2021
• Installation by an NSI or SSAIB-accredited company
• A police Unique Reference Number (URN) obtained through the installer

A DIY or app-only system cannot access this tier. This is the critical distinction that most consumer guides fail to explain clearly.

UK Standards: EN 50131 Grades, PD 6662 and NSI/SSAIB

These standards and bodies determine whether a system is insurance-valid and police-response capable. Understanding them is essential for any professional specification.

BS EN 50131 Grades

The European standard for intruder detection systems defines four grades of security level:

For most UK homes: Grade 2. Always check the insurer's requirements before specifying - some policies on higher-value properties specify Grade 3.

PD 6662:2017

The UK umbrella scheme document that references BS EN 50131 for system performance and BS 8243:2021 for confirmed alarm procedures. Any new monitored intruder alarm system installed in the UK since 1 June 2019 must conform to PD 6662:2017 and BS 8243:2021 to be eligible for a police URN.

NSI and SSAIB

The two UKAS-accredited certification bodies for the UK security industry:

• NSI (National Security Inspectorate)
• SSAIB (Security Systems and Alarms Inspection Board)

Only installers approved by NSI or SSAIB can:

• Issue a certificate of compliance confirming the system conforms to PD 6662:2017
• Apply for a police URN on behalf of the client (application fee: £45.66 plus VAT as of April 2020, applied for by the installer)
• Give insurers the documentary evidence they need to validate a policy discount

When specifying a police-response system, always confirm the installer holds current NSI Gold or SSAIB approval.

Insurance Implications

Insurers do not distinguish between wired and wireless at the same grade. A Grade 2 wireless system installed by an NSI/SSAIB company with a valid certificate of compliance satisfies the same insurer requirement as an equivalent wired system. Combined with CCTV, insurers typically allow premium reductions of 5 to 20% for a graded, certified installation.

Maintenance Standards

BS 9263 sets the maintenance visit schedule: approximately two service visits per year for monitored systems, one per year for bells-only. Factor this into the total cost of ownership when comparing system types.

Key Buying Factors

Zones

Each protected area or detection device occupies one zone on the control panel. A typical three-bedroom semi-detached house needs sensors covering the hallway, living room, kitchen, landing and any ground-floor access points - typically six to eight zones as a minimum. Specify the panel by the total number of zones needed at full expansion, not the opening configuration.

Operating Frequency: 868MHz vs 433MHz

This is one of the most important - and least discussed - buying factors for professional installers.

868MHz is the dedicated licence-free frequency band for professional UK and European wireless alarm systems. It is significantly less congested than 433MHz (which also carries a huge range of cheap consumer devices, remote controls and smart home kit). Professional 868MHz systems support:

• Two-way encrypted communication (the hub and sensor talk to each other; a missing sensor response triggers an alert within seconds)
• AES-128 or equivalent encryption
• Frequency hopping to defeat jamming
• Full EN 50131 grading compliance

433MHz is used by many budget imports and some lower-tier domestic kits. Most 433MHz systems are one-way (sensor transmits, hub receives - no acknowledgement), unencrypted or weakly encrypted, and do not meet EN 50131 grading requirements.

Rule of thumb: if the product does not state 868MHz and two-way encrypted communication, it is almost certainly a budget 433MHz device that will not meet insurance or police-response requirements.

Pet Immunity

Specify the maximum animal weight for the property. Quality commercial-grade PIR detectors handle animals up to 36kg using shaped detection zones and temperature-discrimination logic. Dual-technology detectors (PIR plus microwave) provide an additional layer of protection against false activations in properties with multiple or larger pets.

Battery Life

Modern professional wireless systems are engineered for extended battery life. Leading two-way radio protocols enable detector battery life of up to seven years in typical use, with in-app low-battery alerts well before replacement is required. Keypads typically last two to three years per battery set. When comparing products, look for the manufacturer's rated battery life in typical conditions, not best-case figures.

Range and Signal Penetration

Manufacturer range figures are always open-space maximums. Through-wall attenuation reduces effective range significantly - reinforced concrete, lead-lined walls and metallic foil-back insulation are all significant obstacles. For larger properties or buildings with challenging construction:

• Use a range extender to add another relay hop, effectively doubling coverage
• Specify a self-healing mesh system that allows sensors to route signals via adjacent sensors, automatically finding the best path to the hub
• Site the hub centrally rather than at the entry point

Tamper Protection

Every component of a Grade 2 or above system must be tamper-protected - the act of opening or removing a sensor must generate a tamper signal to the hub. Always confirm that detectors, bell boxes, keypads and the main panel all carry tamper-protection circuits before specifying.

Best Wireless Alarm Systems UK: Brand Comparison

The UK professional wireless alarm market is dominated by a handful of brands well known to installers. Here is a straightforward comparison of the main options available at trade from Harbro Electrical.

A note on budget DIY systems: brands such as ESP Fort (Scolmore Group), Ring and Yale occupy the budget self-monitored market. ESP Fort runs on 433MHz and is not EN 50131 graded. Ring and Yale are app-monitored Grade 1 systems appropriate for lower-risk properties where police response and insurance compliance are not primary requirements. They are not comparable to the professional Grade 2/3 systems above.

Pyronix Enforcer V11

Pyronix is a proudly British brand, manufactured in Rotherham, South Yorkshire, and now part of the Hikvision group. The Enforcer V11 is the UK's most widely installed Grade 2 wireless panel in the sub-£500 supply cost bracket. Key features:

• 868MHz two-way encrypted radio with 128-bit encryption
• Conforms to Grade 2 / PD 6662:2017
• On-board Wi-Fi for no-additional-cost app connectivity
• HomeControl+ app (free in year one; subscription thereafter)
• Fast, well-documented installation familiar to most UK installers

Pyronix is the natural choice for installers who want a reliable UK-standard wireless system at a competitive ex-VAT price point.

Hikvision AX PRO and Dahua

Both Hikvision and Dahua produce 868MHz two-way wireless alarm panels that integrate natively with their respective CCTV ecosystems. For trade electricians already installing Dahua IP CCTV or Hikvision cameras, adding the matching alarm panel keeps the entire security installation within one app and one management interface - a significant practical advantage for the end customer and for future service calls.

Harbro Electrical stocks Dahua CCTV across the full IP and analogue range. For properties with existing coax infrastructure, our Eagle Analogue CCTV range offers a cost-effective HD-TVI retrofit path that pairs equally well with a wireless alarm installation.

Wireless Alarm System Costs in the UK

Costs vary considerably by system tier, property size and whether you are sourcing components at trade or buying a fully installed package from a security company. Here are realistic UK market ranges as a guide:

Trade electricians purchasing Pyronix or Dahua components directly from Harbro Electrical benefit from ex-VAT trade pricing and free UK mainland delivery on orders over £70 - which is worth factoring into your supply cost calculations versus distribution through a full security systems distributor.

For Trade Electricians: What You Can Self-Fit and When to Partner

Wireless alarm installation has become a realistic add-on for trade electricians, particularly those already installing CCTV, doorbells or smart home kit. Here is a clear breakdown of what sits within typical electrical competency and where NSI/SSAIB accreditation becomes essential.

What you can typically self-fit:

• App-monitored / bells-only wireless systems (Pyronix Enforcer, Yale) for homeowners who understand these will not receive a police URN
• Supply of components to an NSI/SSAIB installer who handles commissioning and certification
• Dahua or Hikvision AX PRO combined alarm + CCTV installations in an app-monitored configuration where CCTV verification replaces ARC monitoring
• Retrofitting additional sensors onto an existing professionally installed system (with the system's service company's agreement)

When NSI/SSAIB accreditation is required:

• Any system that needs a police URN
• Any system where the customer requires a certificate of compliance for their insurer
• Any commercial installation under a security maintenance contract
• Any Grade 3 or Grade 4 installation

The practical path for electricians:

Many trade electricians expanding into security either work alongside an NSI/SSAIB accredited security engineer - supply and fit the electrical infrastructure, the engineer commissions and certifies - or progress to SSAIB membership themselves if security becomes a significant part of their workload.

The British Security Industry Association (BSIA) and SSAIB both offer guidance on the accreditation route for electrical contractors.

For now, the fastest commercial opportunity is combining a Dahua wireless alarm or Hikvision AX PRO with an existing CCTV installation: the customer gets a fully integrated security system with one app, and you supply both product lines from the same trade account at Harbro. If you are also fitting a doorbell transformer or video doorbell on the same job, the alarm becomes a natural upsell at the point of a wider access-control or entry-system visit.

Frequently Asked Questions

What is a wireless alarm system?

A wireless alarm system is an intrusion-detection network where sensors - such as PIR motion detectors and door contacts - communicate with a central hub by encrypted radio signal instead of cables. When triggered while armed, the hub sounds sirens, sends smartphone alerts, and can notify a 24/7 monitoring centre for verification and response.

Do wireless alarms need Wi-Fi?

No. Sensors communicate with the hub by dedicated radio - typically 868MHz in the UK - not Wi-Fi. The hub only needs an internet connection (Ethernet, Wi-Fi or cellular SIM) for app alerts and monitoring centre signalling. The siren still sounds locally without internet, and cellular backup keeps monitored systems online if broadband fails.

Can a wireless alarm be jammed or hacked?

Rarely in practice. Quality professional systems use AES-128 encryption plus frequency hopping and built-in jamming detection. Most burglars simply force entry rather than attempting to jam an alarm, and any jamming attempt on a professional system is logged as a tamper event and triggers an alert to the monitoring centre.

Are wireless alarms as reliable as wired?

Yes, for most properties. Professional wireless systems using two-way encrypted radio (868MHz) are reliable enough to meet EN 50131 Grade 2 and Grade 3 standards. Wired systems retain an advantage in very large buildings or environments with extreme RF interference, but for homes and smaller commercial premises, a properly installed wireless system is equally robust.

What alarm grade do I need for my home?

Most UK homes require EN 50131 Grade 2, which covers low-to-medium risk properties and satisfies the majority of home insurers. Higher-value homes, commercial premises or properties where an insurer specifically requires it will need Grade 3. Always check your insurer's requirements before specifying a system.

Can I get police response for a wireless alarm?

Yes, but only with a monitored system using confirmed-alarm technology, installed by an NSI or SSAIB-accredited company that obtains a police Unique Reference Number (URN). DIY or app-only systems cannot receive a URN and therefore cannot receive a direct police response to an activation.

How much does a wireless alarm system cost in the UK?

DIY wireless kits typically cost between £150 and £300 supplied. Professionally installed wireless systems for a standard home range from around £600 to £1,200, with larger or monitored installations reaching £800 to £2,000 or more. Monitoring contracts add roughly £8 to £50 per month, and annual maintenance visits cost around £75 to £200.

Will my pets trigger a wireless PIR sensor?

Not with a correctly selected pet-immune PIR. Quality detectors use shaped lenses and temperature-discrimination algorithms to ignore animals up to a specified weight - typically up to 36kg for top-grade detectors. Dual-technology PIRs combining passive infrared and microwave detection reduce false alarms further. Always check the manufacturer's specified pet tolerance before fitting.

How long do wireless alarm batteries last?

Battery life varies by product, but modern professional systems are engineered for longevity. Modern detectors using proprietary two-way radio protocols can achieve up to seven years of battery life, with in-app low-battery warnings well before replacement is needed. Keypads typically last two to three years per charge cycle.

What is the difference between 868MHz and 433MHz wireless alarms?

868MHz is the dedicated licence-free frequency band used by professional UK and European wireless alarm systems, including Pyronix, Hikvision AX PRO and Dahua. It is less congested than 433MHz, which is used by many budget imports. Professional 868MHz systems support two-way encrypted communication and meet EN 50131 grading requirements; most 433MHz budget systems do not.

Ready to Specify?

Harbro Electrical stocks professional-grade wireless alarm components and kits from Pyronix and Dahua at ex-VAT trade prices. Free UK mainland delivery on all orders over £70.

• Dahua IP CCTV cameras and kits
• Eagle Analogue CCTV
• Wireless CCTV systems
• CCTV systems overview
• Doorbells and access control
• Doorbell transformers

For trade orders and account enquiries, call us on 0191 518 1998 or visit our trade counter at 5 and 6 Whitworth Road, Peterlee, County Durham, SR8 2LY.

All prices shown exclude VAT. Free delivery applies to UK mainland addresses on orders over £70.