Best door & window alarms UK (2026) — compared & price-tracked

This is the biggest Ring Alarm bundle sold on Amazon UK and it covers a full house out of the box: six contact sensors, three motion detectors, a keypad, an indoor camera and an outdoor siren. It's a genuinely cheap first layer of home security, but treat the on-screen '£X saved' framing with a pinch of salt and budget for a Ring Home subscription if you want remote control or cellular backup.

Best for Homeowners wanting whole-house DIY alarm coverage — doors, windows, motion, an indoor camera and an outdoor siren — set up in one go rather than bought piecemeal.

• Enough sensors for most 3-4 bed homes without buying add-ons separately
• Self-monitoring (local keypad + app alerts) works with no subscription at all
• Indoor camera and outdoor siren are bundled in, not extras

• Remote arm/disarm, cellular backup and video recording all need a paid Ring Home plan
• 14 separate pieces to place and pair — a longer install than a basic 4-piece starter kit

Who shouldn't buy it: Don't buy the XL pack if you live in a flat or small house — a basic 4-5 piece Ring Alarm kit covers that for well under half the price, and you can add sensors later as needed.

The Ring Alarm 5 Piece Kit is a solid entry point into DIY home security — it's quick to fit yourself and works fine as a stand-alone system with no subscription. Treat it as an affordable notification and deterrent layer, not a replacement for a professionally monitored, insurance-recognised alarm.

Best for Renters and homeowners who want an affordable, self-fit smart alarm layer without a monitoring contract

• DIY setup in minutes — no drilling, wiring or professional install
• Works stand-alone via the free Ring app with no mandatory subscription
• Integrates neatly with Alexa and other Ring devices; easy to expand with extra sensors

• The siren (approx 100–104dB depending on source) is on the modest side next to a dedicated bell-box alarm — reviewers note it can sound quiet in a larger house
• Cellular (4G) backup and monitoring both need a paid Ring subscription: the ~£8/month Ring Multi plan covers backup only — 24/7 professional monitoring with guard dispatch is a separate Ring Guard Response tier at £29.99/month, roughly four times the price

Who shouldn't buy it: Skip it if you want a professionally monitored, insurance-recognised system — Ring's optional Assisted Monitoring calls your own emergency contacts rather than a certified monitoring station or the police, and this alarm on its own won't reduce your home insurance premium.

A solid entry-level layer of security: wire-free to fit, no monthly fee, and loud enough to matter as a deterrent. It's self-monitored though, so treat it as an alert system for you, not a substitute for a professionally monitored alarm.

Best for Households wanting a self-monitored, no-subscription smart alarm that also covers a shed, garage or side access via its 200m wireless range.

• No subscription or monthly fee for core alerts (app, SMS, email) — but no cellular backup, so a broadband or power outage stops remote push alerts (sirens still sound locally)
• Works with Alexa and Google Assistant; expandable to ~40 devices for larger homes
• 200m wireless range covers outbuildings, not just the main house

• Base kit ships with only 2 PIR sensors and 1 door/window contact — most homes need extra sensors for full coverage
• Self-monitored only — no professional monitoring/response option, and no insurance discount should be expected

Who shouldn't buy it: Skip it if you want a professionally monitored system with 24/7 call-centre response or an insurer-recognised grade — this alerts you directly, it doesn't dispatch anyone.

A sensible, well-reviewed way to add a basic deterrent layer — fit it yourself in minutes and there's nothing more to pay. It's a local, self-monitored system rather than a professionally monitored one, which is worth knowing before you buy.

Best for Renters and first-time buyers who want a quick, no-subscription starter alarm for a flat, small home, or single entry point.

• No monthly fees — the kit is genuinely free to run once purchased
• 100dB siren is loud enough to be a real deterrent and alert neighbours
• Sensors and keypad run for months to years before a battery swap

• No professional monitoring or cellular backup: remote phone alerts need your broadband and mains power, so a broadband or power cut stops them (the HomeBase siren still sounds while the HomeBase has power)
• Five pieces only covers one or two doors/windows; bigger homes need extra sensors bought separately

Who shouldn't buy it: Don't buy this if you want a monitored alarm that calls a control room or the police automatically — this is a self-monitored deterrent that only alerts your phone, not a substitute for a graded, monitored system.

A capable, no-drill DIY kit that adds a real extra layer of protection alongside good locks and lighting. The base system self-monitors for free via the app, but recorded camera footage, cellular backup and 24/7 professional monitoring all sit behind a paid plan on top of the kit price.

Best for A house or flat that wants a proper alarm-plus-camera kit, self-installed in an afternoon, without a professional call-out.

• Includes a genuine outdoor siren, not just an app or phone alert
• Free self-monitoring option exists — no forced subscription just to use the alarm
• Pet-friendly motion sensors (rated to 27kg) cut down false alarms from cats and dogs

• UK buyers repeatedly report the adhesive sensor pads working loose — use the supplied screws rather than relying on sticky mounts alone
• Full value (recorded footage, cellular backup, live monitoring) needs an ongoing paid subscription

Who shouldn't buy it: Don't buy this if you're not prepared to fit the sensors with screws (not just the adhesive pads) or you specifically want fully monitored 24/7 security with zero ongoing cost — the free tier is self-monitoring only.

A capable DIY kit that covers two entry points and general motion out of the box, with a loud local siren included at the kit price — but full app control, alerts and monitoring sit behind an optional Pro Premium plan (up to £360/year), making this more of a step-up pick once that's budgeted for than the cheapest way into home security. It won't reduce insurance premiums either, since SimpliSafe UK is self-install and not an NSI/SSAIB-graded system.

Best for Renters or homeowners who want a proper DIY smart alarm covering the main entry points, with monitoring left optional rather than forced.

• No contract required — the kit can be bought, installed and used as a stand-alone siren alarm without any subscription
• Quick DIY install with peel-and-stick sensors, no wiring or professional fitting
• Works with Alexa and has a loud base-station siren to deter and alert neighbours

• Full app control, phone alerts, monitoring and cellular backup all need the optional Pro Premium plan (£29.99/month, up to £360/year) — without it you get a local siren only, with no monitored response or app alerts
• Only 2 entry sensors and 2 motion sensors are included, covering two doors/windows plus general motion rather than a whole house — extra sensors are bought separately for larger or multi-entry homes

Who shouldn't buy it: Don't buy this expecting an insurance premium reduction, or if you need guaranteed 24/7 monitored response from day one without budgeting for the optional subscription.

A straightforward, no-frills door/window alarm that does one job well: make a very loud noise if a door or window is forced. It won't call anyone or send an alert, but as the cheapest layer of home security it's honest value.

Best for Renters, sheds and outbuildings, or anyone wanting a cheap first layer of security with zero recurring cost.

• Genuinely loud siren, switchable to a quieter chime for daytime use
• No WiFi, app or subscription — keeps working through broadband or app outages, and there's nothing to pay monthly
• Tool-free install in minutes; remote arms/disarms from outside and has decent range across a house or garden

• No app, phone alerts or remote monitoring — if you're not within earshot, you won't know it's gone off
• Magnetic sensor halves need door/window frames close to flush (within about 5mm), which can be fiddly to line up on older or uneven frames

Who shouldn't buy it: You want a phone notification when you're away from home — this is a local siren only, not a monitored or app-connected system, so it can't alert you remotely.

A solid, easy-to-install DIY alarm kit that covers a typical two-bed home out of the box, with app alerts working free of charge. Think of it as the cheapest layer of home security, not a professionally monitored, insurance-recognised system — budget for a Ring Home subscription if you want cellular backup or emergency-contact call-outs.

Best for A two-bedroom home wanting an affordable, easy-to-fit DIY alarm with app control.

• Genuinely DIY — fits without a professional installer and expands with extra sensors as needed
• Loud base station siren plus a separate outdoor siren for real deterrent noise
• Core features (arm/disarm, app alerts, Alexa control) work out of the box with no subscription

• Cellular backup and emergency-contact 'Alarm Calls' are locked behind a paid Ring Home subscription
• Self-monitored only — no UK professional/police-dispatch monitoring, so it's not a graded system

Who shouldn't buy it: Don't buy if you need a professionally monitored, insurance-recognised alarm — this is a DIY, self-monitored kit, not a graded system, and it won't reduce your home insurance premium.

A serious multi-area system rather than a simple door sensor — core arming, disarming and app alerts work with no subscription, but you'll need Yale's paid Alarm plan for 4G cellular backup and automated call alerts, and a separate, higher-tier plan for professional call-out monitoring.

Best for Larger homes wanting one whole-property smart alarm across up to four independent zones, without being locked into a monthly contract for basic use.

• No subscription needed for core app control, arming/disarming and real-time alerts
• Covers up to 4 independent areas and up to 100 accessories, so it scales to large or multi-building properties
• Works with Alexa, Google Home and other Yale Smart Home kit (cameras, locks, lighting)

• A big outlay compared with a basic standalone door/window alarm
• A handful of Amazon reviewers (small 10-review sample) report app or hub connectivity dropouts and lengthy support calls to resolve them

Who shouldn't buy it: Skip this if you just want a cheap sensor on the back door — it's a whole-property hub-based system, and a £30-£50 basic contact alarm covers that single-door job for far less.

A capable step up from a single stick-on alarm — motion sensors and door contacts across the house, controlled from one app, with no ongoing fees. It's the cheapest layer of home security, not a substitute for locks or a monitored system, and it won't affect your insurance premium.

Best for Households wanting a full DIY alarm covering multiple entry points and rooms, not just one door.

• Covers multiple doors and rooms in one kit (2 PIRs, 2 door contacts)
• No monthly subscription or monitoring fee
• Works with Alexa and Google Assistant; expandable to 40 accessories later

• Costs several times more than a basic single-door alarm
• Self-monitored only, with no cellular backup — if your broadband or router drops, remote app alerts stop (the local 104dB siren still sounds, but nobody's phone is notified)

Who shouldn't buy it: Don't buy it if you only need to secure one or two entry points — a simple standalone door/window alarm covers that for a fraction of the price.

A basic vibration-triggered siren that does one job well: make a loud noise on the spot if a window is struck or forced. It's not a monitored system and won't notify anyone remotely, but as a low-cost deterrent per window it's straightforward and does what it says.

Best for A cheap first layer of alarm cover on ground-floor windows or a shed/outbuilding door.

• Very cheap per window (two in the pack)
• 130dB siren is genuinely loud and startling at close range
• Peel-and-stick fit — no wiring, drilling or app setup

• Local siren only — nobody is alerted if you're not in earshot
• Runs on small button-cell batteries that need occasional checking

Who shouldn't buy it: You want an alert sent to your phone or a keyholder while you're out — this only sounds an alarm on the spot, so look at a monitored or smart sensor instead if remote notification matters to you.

A simple, inexpensive way to add a loud deterrent siren to windows and doors, with no wiring, no app and nothing to subscribe to. It won't replace a monitored alarm system, but as a first layer of protection — or for renters who can't fit anything permanent — it does the basic job well.

Best for Renters and anyone wanting a cheap, no-fuss first layer of window and door security.

• Genuinely loud 120dB siren, enough to startle an intruder and alert neighbours
• No app, hub or subscription needed — self-adhesive fit, working in minutes
• Four units per pack, so one set covers several doors and windows cheaply

• Basic magnetic-contact trigger only — no motion, glass-break or smartphone alert if you're not home to hear it
• Runs on 3x LR44 button cells rather than everyday AAA — shorter-lived, fiddlier to source the right equivalent, and best kept away from small children like any button cell

Who shouldn't buy it: Skip this if you want a monitored system or a phone alert while you're out — this is a local siren only, useless if nobody's around to hear it, and it won't affect your home insurance premium. It also needs a snug 1–9mm gap between sensor and magnet, so it's a poor fit for warped frames, deeply recessed sashes or wide-reveal uPVC frames.

A competent, expandable DIY kit with a genuine 104dB siren rather than a dummy box, and app control that works over the hub's ethernet connection or its built-in 4G SIM. It's a decent step up from a video doorbell alone — ERA also sells the same hub, siren and sensors as separate components and in other bundles direct from eraprotect.com, so it's worth comparing prices there before choosing this exact Amazon bundle.

Best for Renters and homeowners who want a proper self-monitored alarm with a real siren, not just an app notification, and don't want a wired install or a monitoring contract.

• 104dB battery-backed live siren, not just a phone alert
• Dual-path hub (ethernet + built-in 4G SIM) so it isn't dead the moment broadband drops
• Wireless, expandable up to 96 accessories if you add rooms or a shed later

• Full remote monitoring / cellular backup needs an ongoing ERA Protect Plus subscription after the 3-month trial

Who shouldn't buy it: Don't buy this exact Amazon bundle if you're comfortable building your own kit — ERA sells the same base hub, live siren and sensors individually (and in other bundles) direct from eraprotect.com, so it's worth comparing prices there first; buy this one only for one-box simplicity.

This is a genuine step up from a single battery contact alarm — a hub-based system with real motion and door sensors, backed by both a working siren and a bonus replica siren for visible deterrence. It's a reasonable buy for a full flat or ground-floor setup, but it sits well above simpler alarms in this category on price, and the cellular backup relies on a subscription once the included trial ends.

Best for Households wanting a proper app-controlled alarm covering motion and door/window entry points, with a visible dummy siren box added for extra deterrent effect.

• Proper app-controlled system covering motion and door/window in one kit, not just a single sensor
• Working 104dB siren plus a separate replica siren box for extra visible deterrence
• Hub has a built-in 4G backup SIM so the alarm can stay connected if broadband drops, with a 3-month trial included

• Costs several times more than a basic door/window contact alarm in this category
• Cellular backup and automated calling need an ongoing ERA Protect Plus subscription (from £8.00/month) after the 3-month trial

Who shouldn't buy it: Don't buy this if you only need a cheap alarm on one door or a shed — a standalone battery contact alarm does that job for a fraction of the price with no subscription to think about.

A simple, no-frills magnetic alarm that does one job well — sound a loud siren if a door or window opens. There's no app and nothing to monitor it remotely, but as an audible deterrent, or a chime to alert you when a child opens a door, it does what it promises for well under a tenner. Worth flagging: B&Q lists just a three-month guarantee on this line, shorter than is typical for the category.

Best for Renters and budget-conscious households wanting the cheapest possible first layer of door/window security.

• Loud 100dB siren for the price — enough to startle and deter
• Switchable chime mode doubles as a child-safety or shop-door alert
• Battery-powered stick-on install — no wiring, no subscription, minutes to fit

• No phone notification or remote monitoring — you only hear it if you're in earshot
• Adhesive mount can loosen over time on textured or cold frames

Who shouldn't buy it: You want to know if a door's been opened while you're out. This has no app, hub, or cellular link — for that you need a monitored smart sensor, which comes with its own subscription cost.

A simple two-piece contact alarm that does one job well — it sounds a genuinely loud 120dB alert the moment a door or window opens. There's no app, no monitoring and no subscription; it's a basic, battery-powered deterrent, not a security system, and it's priced accordingly. It runs on small LR44 button batteries, so keep spares away from young children.

Best for Renters and anyone wanting a cheap, no-fuss first layer of security on vulnerable windows and back doors.

• Loud 120dB siren is a real deterrent, not a token beep
• Peel-and-stick install in minutes, no wiring or drilling
• Cheap enough to fit one on every downstairs window and door

• No smartphone alert or remote monitoring — you only hear it if you're home or a neighbour does
• Basic adhesive mount can work loose over time on some frame finishes

Who shouldn't buy it: Skip this if you want to know a door's been opened while you're out — it's audible-only with no app or cellular backup, so pair it with a monitored smart system if remote alerts matter to you.

A sensible, low-cost way to get app alerts on a front door and one room — not a burglar deterrent claim, just an affordable early-warning layer. The free tier covers push notifications; cellular backup needs a paid Ring Protect plan, and human-monitored alerts (Assisted Monitoring) are a further paid add-on — there's no UK police-dispatch service.

Best for Renters or homeowners wanting a cheap first layer of alert on one entry point, without signing up to a monitoring contract.

• No contract required for basic app alerts and self-monitoring
• Quick DIY setup, no wiring or professional install needed
• Works with Alexa and is easy to expand with extra sensors later

• Only one door/window sensor and one motion detector in the box — most homes need extras to cover more entry points
• Cellular backup needs a paid Ring Protect plan, and monitored alerts (Assisted Monitoring) cost extra on top

Who shouldn't buy it: You want whole-house coverage or monitored alerts out of the box — buy a bigger pack or add sensors, and budget for Ring Protect plus Assisted Monitoring if you want that; this alarm alone won't affect your home insurance premium.

A straightforward, wire-free add-on sensor rather than a standalone alarm. It does its one job — flag when a monitored door or window opens — reliably, but only if you already have a compatible Yale panel to plug it into.

Best for Households who already own a Yale Sync or Yale Intruder wireless alarm panel and want to add contact coverage to one more door or window.

• Wire-free magnetic contact, straightforward DIY fit
• Anti-tamper protection and a low-battery warning
• Claimed 200m wireless range to the panel, battery included in the box

• Not a standalone alarm — no siren of its own, and it needs an existing compatible Yale panel to do anything
• No smart-app features by itself; any phone alerts come from the paired Yale Sync system, not this unit

Who shouldn't buy it: Don't buy this if you don't already have a compatible Yale alarm panel installed — on its own it does nothing; you'd need a full kit, not just a sensor.

A tidy way to extend an existing Yale HSA6000-series alarm (and, per some retailers, older HSA3000 panels) — but it's an accessory, not a standalone alarm, and it isn't cheap per opening. It has no siren, app or subscription of its own; it just tells your existing panel a door or window has opened.

Best for Households who already have a Yale HSA6000-series alarm panel (or, per some retailers, an older HSA3000 system) and want to add contact cover to another door or window.

• Surface-mount fitting — no wiring, sticks or screws on in minutes
• Built-in tamper alert if someone tries to remove it from the wall

• Only works with a Yale HSA6000-series panel (and, per some retailers, older HSA3000 systems) — not a standalone alarm and not compatible with Yale's Sync smart alarm range
• No smartphone app, Wi-Fi or siren of its own — all of that lives in the panel, not this sensor

Who shouldn't buy it: Don't buy this if you don't already own a Yale HSA6000-series (or compatible HSA3000) alarm panel, or if you want an app-connected smart contact sensor — this won't pair with Yale Sync and won't do anything as a standalone unit. Buying one per door is also an expensive way to cover several doors compared with a standalone contact alarm.

This is the cheapest realistic layer of physical security you can add to a single door — a loud siren plus a motion sensor that arms and disarms with a fob or PIN code, no wiring or subscription involved. It won't replace a proper monitored system, but as a low-cost deterrent for one entry point it does the job.

Best for A cheap, self-contained alarm for a shed, garage, caravan or outbuilding rather than a whole house

• Genuinely no ongoing cost — no app, hub or subscription required
• Wire-free DIY install, usually done in minutes
• 130dB manufacturer-rated siren — loud enough to be a real deterrent at close range

• No smartphone alerts — if it goes off while you're out, you won't know until you're back
• Only one door contact and one PIR in the kit, so it covers a single point of entry, not a whole property

Who shouldn't buy it: Don't buy it if you want a phone notification when you're away, or need to cover a full house rather than one shed, garage or door — a smart hub-based kit will do that; this won't.

This is a mechanical trip alarm, not a connected security system: wedge it under a door and it fires a loud 120dB siren if someone pushes it open. It's a genuinely useful, low-cost extra layer for a door you can't otherwise secure, but it won't deter a determined intruder and it can't tell you anything when you're not there to hear it.

Best for Renters, travellers and anyone wanting a cheap, no-drill alarm for a spare door, hotel room, shed or static caravan.

• Loud 120dB siren is very hard to miss at close range
• No drilling, wiring or app setup — wedges under a door in seconds
• Three-pack covers several doors (or a door plus a shed and a hotel stay) cheaply

• Purely local and audible — no phone alert, so it's no help if you're not within earshot
• Batteries aren't included (you'll need three 9V cells for the full pack), and it only works reliably on inward-opening doors over a hard, flat floor; carpet or uneven thresholds reduce grip

Who shouldn't buy it: Don't buy this if you want to know about an intrusion while you're out — it only makes noise where it's fitted. Pair it with (or choose instead) a monitored or app-connected alarm if remote alerts matter to you.