Your neighbour got burgled last month. Nothing dramatic — they were at work, someone forced the back door, took a laptop and some jewellery. The police came, took a statement, and that was basically it. Now you’re lying in bed at 2am wondering if your house is next, and whether that £30 window alarm from Argos is doing anything at all.
A proper smart alarm system changes the equation. It alerts your phone the moment something happens, lets you check cameras live, triggers a siren that makes everyone within 200 metres stare at your house, and — with monitored options — calls a response team before you’ve even opened the notification. The technology has caught up with the price too. You can protect a 3-bed semi for under £300 with a DIY system, or spend £500-800 for professional monitoring that rivals what businesses pay.
In This Article
- DIY vs Professional Monitoring
- Best DIY Smart Alarm Systems
- Best Professionally Monitored Systems
- Essential Components of a Smart Alarm
- Smart Alarm Protocols: WiFi vs Zigbee vs Proprietary
- Integration with Smart Home Ecosystems
- Installation Tips
- Running Costs and Subscriptions
- Insurance Discounts
- Frequently Asked Questions
DIY vs Professional Monitoring
DIY Self-Monitored
You install it yourself, you monitor it yourself. When a sensor triggers, the alarm sounds and your phone gets a notification. You decide what to do — check the camera, call a neighbour, call the police. The system costs £150-400 upfront with no ongoing fees (though some brands offer optional cloud storage subscriptions at £3-10/month).
Pros: no contracts, no monthly fees, full control, easy to move house with Cons: relies on you being awake and available, police response depends on you calling 999
Professional Monitoring
A monitoring centre watches your system 24/7. When an alarm triggers and you don’t respond within a set time, they contact you, then your emergency contacts, then dispatch their own response team or alert the police. Monthly costs range from £15-40 depending on the provider and response level.
Pros: someone is always watching, faster response, insurance companies prefer it Cons: monthly fees add up (£180-480/year), contracts typically 12-36 months, false alarm protocols can delay response
Which Is Right for You?
For most UK homeowners, a DIY self-monitored system is the practical choice. The upfront cost is lower, there are no ongoing fees, and smartphone notifications are fast enough for most situations. Professional monitoring makes sense if you travel frequently, leave the house unoccupied for extended periods, or want the insurance discount that monitored systems provide. We’ve previously compared the top smart alarm brands if you want the head-to-head detail.
Best DIY Smart Alarm Systems
Best Overall: Ring Alarm (2nd Gen) 5-Piece Kit (about £220, amazon.co.uk)
Ring dominates the UK DIY alarm market for good reason. The 5-piece kit includes a base station, keypad, contact sensor, motion detector, and range extender. The app is excellent — clear, responsive, and integrates with Ring cameras and doorbells if you have them. The siren is loud (104dB), sensors are reliable, and the whole system installs in under an hour with nothing more than adhesive strips and a smartphone.
The base station has a 24-hour backup battery and cellular backup (via the Ring Protect Pro plan at £10/month), so cutting the WiFi or power doesn’t disable the system. Additional sensors cost £20-30 each. Most 3-bed houses need 2-3 extra contact sensors to cover all ground-floor entry points.
Best for Apple Homes: Eve Door & Window Sensors + HomePod (about £30 per sensor)
If your household is deep in the Apple ecosystem, Eve’s Thread-based sensors work natively with HomeKit. No hub needed beyond a HomePod or Apple TV. Set up automations in the Home app: door opens → lights flash → notification → siren (via a HomeKit-compatible siren like the Eve Siren at about £40). It’s not a traditional alarm system, but for tech-savvy Apple users, it’s seamless and has zero monthly fees.
Best Budget: Yale Sync Smart Home Alarm IA-320 (about £180, screwfix.co.uk)
Yale is a trusted name in UK home security. The Sync alarm comes with a hub, PIR sensor, door contact, and remote keyfob. The siren is integrated into the hub (not a separate box), which keeps things compact. Yale’s app is functional if not flashy. The main advantage over Ring is that Yale sensors use a proprietary long-range signal rather than Z-Wave, giving better range through thick UK walls. Available at Screwfix, Toolstation, and Amazon UK.
Best for Renters: SimpliSafe (about £250 for a starter kit, simplisafe.co.uk)
SimpliSafe is entirely wireless and adhesive-mounted — no screws, no drilling, no damage to rented properties. Take it with you when you move. The optional monitoring service (from £13/month) is contract-free — cancel any month. The hardware feels premium for the price, and the system supports up to 100 sensors per base station, which is overkill for most homes but means you’ll never outgrow it.
Best Professionally Monitored Systems
Best Overall: ADT Smart Home (from £300 + £25-40/month)
ADT has been monitoring UK homes since 1874. Their Smart Home package includes professional installation, a touchscreen panel, sensors, and 24/7 monitoring by their UK-based Alarm Receiving Centre. The monitoring plans include police response — ADT is one of the few UK providers with direct police URN (Unique Reference Number) connections, meaning they can request police dispatch without going through 999.
The downside is the contract — typically 36 months, with early termination fees. But if you want set-and-forget security with guaranteed professional response, ADT remains the gold standard. According to the Home Office crime statistics, homes with visible alarm systems are far less likely to be targeted.
Best Hybrid: Ring Alarm Pro with Ring Protect Pro (£220 + £10/month)
Ring’s Protect Pro plan adds 24/7 professional monitoring to the standard Ring Alarm system. When an alarm triggers, Ring’s monitoring centre contacts you, then dispatches an alert if you don’t respond. It’s not as comprehensive as ADT’s police-connected monitoring, but at £10/month with no contract, it’s the most affordable monitored option in the UK. The Ring Alarm Pro base station also doubles as a WiFi 6 router (eero built-in), which is a real bonus if your router is overdue an upgrade.
Best British: Verisure (from £400 + £30-50/month)
Verisure (formerly Securitas Direct) offers professionally installed and monitored systems with features other providers lack: photo verification sensors that snap a picture when triggered (so the monitoring centre can confirm a real intrusion before dispatching), SOS buttons for personal safety, and a dedicated guard response option. Premium pricing, but the verification approach reduces false alarms sharply and speeds up real responses.
Essential Components of a Smart Alarm
Base Station / Hub
The brain of the system. Connects to your WiFi and communicates with all sensors. Look for:
- Backup battery — 24 hours minimum, so a power cut doesn’t disable your alarm
- Cellular backup — a SIM card that keeps the system online if your broadband goes down. Ring and SimpliSafe both offer this.
- Loud siren — 100dB minimum. Most standalone sirens hit 104-110dB, which is uncomfortable indoors and audible from the street.
Door/Window Contact Sensors
Two-piece magnetic sensors that detect when a door or window opens. You need one on every ground-floor external door and accessible window. Budget: £15-30 each. The most triggered sensor type — they catch break-ins at the first point of entry.
PIR Motion Detectors
Passive infrared sensors detect body heat moving across the room. Place them in hallways and main living areas. Most smart PIRs have pet-immune modes that ignore movement below a certain weight (usually 25-30kg), so your dog won’t trigger false alarms.
Outdoor Siren
A visible external siren box serves two purposes: it deters opportunistic burglars (they’ll pick the house without one), and it alerts neighbours when triggered. Even dummy siren boxes have some deterrent effect, but a live one connected to your system is better.
Keypad
An internal keypad for arming and disarming without using the app. Essential for family members who don’t have the app, visitors, or when your phone is dead. Keypads should have a code-lockout feature that disables entry after 3-5 wrong attempts.
Smart Alarm Protocols: WiFi vs Zigbee vs Proprietary
WiFi
Sensors connect directly to your WiFi network. Simple but limited — WiFi sensors drain batteries faster and can congest your network if you have many devices. Best for small setups with 5-10 sensors.
Zigbee / Z-Wave
Mesh networking protocols where sensors relay signals through each other to reach the hub. Better range, better battery life, and more reliable in houses with thick walls. Ring uses Z-Wave; many professional systems use Zigbee. If you’re curious about how these protocols differ, our guide on smart home protocols covers the technical detail.
Proprietary
Yale and some professional providers use their own radio frequencies. Advantages: optimised for security (harder to jam), long range, reliable. Disadvantages: locked to one brand’s ecosystem. You can’t mix Yale sensors with a Ring hub.
Integration with Smart Home Ecosystems
Amazon Alexa
Ring integrates natively — “Alexa, arm my alarm” and “Alexa, show me the front door” work out of the box. Yale also integrates via Alexa. SimpliSafe has basic Alexa support for arming/disarming.
Google Home
Ring works with Google Home for camera viewing but alarm integration is limited. Yale has Google Home support. SimpliSafe works with Google for arm/disarm voice commands.
Apple HomeKit
Limited native support. Eve sensors work natively. Ring and Yale do not integrate directly with HomeKit — you’d need a bridge like Homebridge (technical) or HOOBS. If Apple is your ecosystem, plan around HomeKit-compatible devices or accept using separate apps. Understanding your smart home ecosystem choice before buying an alarm prevents expensive compatibility mistakes.
Installation Tips
Sensor Placement
- Door contacts: on the top edge of the door frame, not the side. Less visible and harder to tamper with.
- PIR sensors: in corners, 2-2.5m high, pointing across the room (not toward windows — temperature changes cause false alarms).
- Outdoor sirens: high on the front wall, visible from the street. Above easy reach (2.5m+) to prevent tampering.
Testing
After installation, walk-test every sensor. Arm the system, open every door and window, walk through every room. Confirm each trigger sends a notification and appears in the app. Do this before trusting the system overnight. Also test the app away from home (use mobile data, not WiFi) to confirm remote notifications work.
False Alarm Prevention
False alarms are the biggest frustration with smart alarms. Reduce them by:
- Pet-immune PIR sensors if you have pets
- Adjusting PIR sensitivity — start on medium, increase if needed
- Avoiding PIR near heat sources — radiators, cookers, and south-facing windows cause thermal false triggers
- Using entry delay timers — give yourself 30-60 seconds to disarm after entering through the front door
Running Costs and Subscriptions
Self-monitored (no subscription)
- Ring Alarm: £0/month (basic) or £10/month for Ring Protect Pro (cellular backup + professional monitoring)
- Yale Sync: £0/month
- SimpliSafe: £0/month (self-monitored) or from £13/month (professional monitoring, no contract)
- Eve (HomeKit): £0/month
Professionally monitored
- ADT: £25-40/month (36-month contract)
- Verisure: £30-50/month (36-month contract)
- Ring Protect Pro: £10/month (no contract)
- SimpliSafe: from £13/month (no contract)
Battery replacement Most sensors use CR2032 or CR123A batteries lasting 1-3 years. Budget £20-30/year for a typical system with 8-10 sensors.
Insurance Discounts
Some UK home insurers offer discounts for homes with monitored alarm systems — typically 5-15% off your premium. The discount varies by insurer and the type of system. ADT and Verisure systems are most likely to qualify because they carry NSI (National Security Inspectorate) or SSAIB certification.
DIY systems like Ring and Yale may not qualify for insurance discounts because they lack third-party certification. Check with your insurer before buying if the discount is a deciding factor — sometimes the monthly monitoring cost exceeds the insurance saving, making it a net loss.
Frequently Asked Questions
Do smart alarms work without WiFi? Most smart alarm sensors communicate with the base station via Z-Wave, Zigbee, or proprietary radio — not WiFi. If your WiFi goes down, the alarm still triggers the siren and local notifications. However, you won’t receive phone notifications or remote access without internet. Systems with cellular backup (Ring, SimpliSafe) maintain connectivity even without WiFi.
Can burglars jam smart alarm signals? Signal jamming is theoretically possible but extremely rare in UK residential burglary. Most burglaries are opportunistic smash-and-grab, not sophisticated electronic attacks. Premium systems like Ring and ADT detect jamming attempts and trigger alerts. For typical UK homes, signal jamming is not a realistic concern.
How many sensors do I need? A typical 3-bed semi needs 4-6 door/window contacts (front door, back door, patio doors, accessible windows) and 2-3 PIR sensors (hallway, living room, kitchen). Most starter kits include 1-2 sensors and a PIR, so budget for 3-5 extra sensors at £15-30 each.
Will my smart alarm trigger police response? Only professionally monitored systems with police URN connections (like ADT) can request police dispatch directly. Self-monitored systems rely on you calling 999. Police response to burglar alarms in the UK requires a verified activation — most forces won’t attend on an unverified alarm signal alone, which is why camera verification is increasingly important.
Can I install a smart alarm in a rented house? Yes — wireless systems like SimpliSafe and Ring use adhesive mounting and don’t require drilling or permanent fixtures. Take the system with you when you move. Check your tenancy agreement first, but most landlords welcome security improvements.