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A basic smoke alarm saved lives in the 1980s. A smart smoke alarm sends a notification to your phone the moment it detects danger — whether you’re asleep upstairs, out at work, or on holiday in Tenerife. In 2026, there’s genuinely no good reason not to upgrade.
We’ve reviewed the top models available in the UK, checked Amazon pricing, and compared them on detection technology, smart home compatibility, subscription requirements, and value. Here’s everything you need to choose the right one for your home.
What Is a Smart Smoke Alarm?
A smart smoke alarm works just like a standard alarm — it detects smoke or heat and triggers a loud siren. The difference is it also connects to your home Wi-Fi or a mesh radio network, letting it:
- Send instant alerts to your smartphone, even when you’re not home
- Integrate with Alexa, Google Home, or Apple HomeKit to trigger automations
- Interconnect with other alarms in the house so they all sound together
- Perform self-tests and report battery status automatically
- Distinguish between smoke and steam (reducing false alarms in kitchens)
UK fire safety regulations (Fire Safety Act 2021) require interlinked smoke alarms on every floor in new builds. Smart alarms meet and exceed this requirement.
Best Smart Smoke Alarms UK 2026 — Our Top Picks
Here’s a quick comparison of the best smart smoke alarms available in the UK right now:
| Model | Type | Smart Platform | Power | Approx. Price |
|---|---|---|---|---|
| Google Nest Protect | Smoke + CO | Google Home | Battery or wired | ~£109 |
| FireAngel Pro Connected FP2620W2-R | Smoke | FireAngel app (standalone) | Battery (10-year) | ~£35–£45 |
| FireAngel Pro Connected FP1640W2-R | Smoke | FireAngel app (standalone) | Mains + battery backup | ~£45–£55 |
| X-Sense Link+ Pro XS01-M | Smoke | X-Sense Home app | Battery (10-year) | ~£25–£30 |
| Ajax FireProtect 2 | Smoke + Heat + CO | Ajax app / professional monitoring | Battery | ~£80–£100 |
| Kidde Smart Smoke Detector i9070 | Smoke | RemoteLync app + Alexa | Battery | ~£40–£50 |
Prices based on Amazon UK and retailer listings as of March 2026. Always verify before purchasing.
1. Google Nest Protect — Best Overall Smart Smoke Alarm UK
The Google Nest Protect remains the gold standard for smart smoke alarms in the UK. Now in its second generation, it combines smoke and carbon monoxide detection with Google Home integration and the legendary Pathlight feature — a gentle white light that illuminates the unit when you walk beneath it at night.
What sets the Nest Protect apart is its split-spectrum sensor, which detects both fast-burning fires (like paper or wood) and slow-smouldering fires (like upholstery) better than single-sensor designs. It also speaks to you — rather than just beeping, it says which room has detected smoke, helping you react intelligently rather than just panic.
Key features:
- Split-spectrum smoke sensor (dual photoelectric + optical)
- CO detection included
- Google Home and Google Assistant integration
- App alerts when away from home
- Silence false alarms with the app — no arm-waving required
- Monthly self-testing
- Interconnects with other Nest Protects wirelessly
The downside: It’s expensive (around £109 per unit), doesn’t work natively with Alexa or Apple HomeKit, and Google has been slow to update the hardware. You’ll also need multiple units to cover a whole home, which adds up fast.
Best for: Google Home households who want the most capable single smoke/CO alarm available in the UK.
2. FireAngel Pro Connected FP2620W2-R — Best UK-Made Smart Smoke Alarm
FireAngel is a British brand with a strong presence in social housing and the private rental market. The Pro Connected range adds smartphone alerts and wireless interlink to their already solid hardware. The FP2620W2-R is battery-powered (10-year sealed battery — no replacing), making installation genuinely plug-and-play.
Critically, FireAngel uses its own proprietary radio mesh (not Wi-Fi) to interconnect alarms. This is actually more reliable in thick-walled UK homes than Wi-Fi-dependent systems, though it does mean you’re locked into the FireAngel ecosystem.
Key features:
- Thermoptek dual-sensor technology (optical + heat)
- Wi-Fi to app via the FireAngel Home hub (sold separately) or built-in on some models
- Wireless interlink — all connected alarms trigger together
- 10-year battery, 10-year sensor life
- Meets BS EN 14604 and UK housing regulations
- Monthly self-test reporting via app
The downside: App and connectivity can be hit or miss. No Alexa or Google Home native integration. Setup requires the FireAngel Connect hub for full smart features.
Best for: Landlords, rental properties, or anyone wanting a compliant, low-maintenance smart smoke alarm that doesn’t require mains wiring.
3. X-Sense Link+ Pro XS01-M — Best Budget Smart Smoke Alarm
The X-Sense Link+ Pro is an increasingly popular option for UK homeowners who want smart features without spending £100+ per alarm. At roughly £25–30 per unit, it’s affordable enough to cover an entire home without breaking the bank.
Like FireAngel, X-Sense uses its own 868MHz radio mesh to interconnect alarms — up to 24 units can be linked together. The X-Sense Home app provides push notifications when an alarm triggers. Battery life is rated at 10 years.
Key features:
- Photoelectric sensor (good for slow-smouldering fires)
- 868MHz wireless interlink across up to 24 alarms
- X-Sense Home app with real-time push notifications
- 10-year battery + sensor life
- Low-battery and self-test alerts
- Alexa compatible (limited integration)
The downside: No CO detection on the base smoke-only model. Google Home integration is limited. The app can be laggy. Not as polished as Nest or FireAngel.
Best for: Budget-conscious homeowners wanting whole-home smart smoke coverage at a reasonable price.
4. Ajax FireProtect 2 — Best Smart Smoke Alarm for Security System Integration
The Ajax FireProtect 2 is a different beast entirely. It’s designed to work within the Ajax smart security ecosystem — one of the most popular professional-grade alarm systems in the UK. If you already have (or are considering) an Ajax hub-based security system, this is the obvious choice.
It combines smoke, heat, and CO detection in one unit, communicates over the encrypted Jeweller radio protocol, and can alert both the homeowner and a professional monitoring centre simultaneously.
Key features:
- Triple detection: smoke + heat + CO
- Encrypted Jeweller radio — no Wi-Fi needed
- Integrates with Ajax Hub for full security + fire monitoring
- Up to 4 years battery life
- Professional monitoring compatible (ARC certified)
- Tamper detection built-in
The downside: Expensive (£80–£100+ per unit). Requires an Ajax Hub to function — not a standalone product. Overkill for most homes unless you’re building a full security setup.
Best for: Ajax security system users, buy-to-let landlords with professional monitoring, or high-value properties.
5. Kidde Smart Smoke Detector — Best for Alexa Users
Kidde is one of the UK’s most recognised smoke alarm brands, and their smart range bridges the gap between affordable traditional alarms and fully-connected smart devices. The Kidde i9070 (and similar models in the smart range) connects via the RemoteLync module to provide app alerts and Alexa voice announcements.
It’s not quite as seamless as Nest Protect, but it’s significantly cheaper and integrates well into Amazon Echo households — Alexa can announce “Smoke detected in the kitchen” across all your Echo speakers.
Key features:
- Ionisation sensor (fast-flame detection)
- Alexa integration via RemoteLync module
- App alerts when triggered
- Interconnects with other Kidde alarms via Kidde’s wireless system
- Good value for money
The downside: Ionisation sensors are less sensitive to slow-smouldering fires vs photoelectric. The RemoteLync hub is a separate purchase. No CO detection on smoke-only models.
Best for: Amazon Echo households wanting simple Alexa-integrated fire alerts on a budget.
What to Look For in a Smart Smoke Alarm
Sensor Type: Optical vs Ionisation vs Dual
This is the most important spec, and most buyers ignore it entirely:
- Optical (photoelectric): Best for slow, smouldering fires — the kind that typically start at night from overheated electrical wiring or smouldering upholstery. Fewer false alarms from cooking. Recommended for bedrooms and living areas.
- Ionisation: Best for fast-flaming fires — blazing paper, wood, or flammable liquid fires. Slightly quicker to react to open flames. However, highly sensitive to cooking steam and toast — hence they’re often ripped off ceilings by frustrated homeowners.
- Dual (optical + heat): The gold standard. FireAngel’s Thermoptek and Google Nest’s split-spectrum sensors combine multiple detection methods. Recommended if you can afford it.
UK government guidance recommends optical alarms or heat alarms for kitchens specifically, due to the high false alarm rate of ionisation sensors in cooking areas.
Smart Platform Compatibility
Match your smoke alarm to your existing smart home ecosystem:
- Google Home users: Google Nest Protect is the only native option
- Amazon Alexa users: Kidde via RemoteLync, or X-Sense with limited Alexa skill
- Apple HomeKit users: Limited options in the UK — consider Eve Smoke (discontinued) or use a bridge
- No smart home / standalone: FireAngel Pro Connected or X-Sense Link+ with their own apps
- Professional security system: Ajax FireProtect 2
CO Detection: Do You Need It?
Carbon monoxide (CO) is odourless and invisible — it kills around 60 people per year in the UK. If you have a gas boiler, gas hob, open fire, wood burner, or attached garage, you need a CO alarm. Whether you combine it with your smoke alarm or buy separately is a matter of preference, but a combined unit reduces clutter and cost.
The Google Nest Protect includes CO detection as standard. Most FireAngel models are smoke-only (you need their CO-specific models for CO detection). Always check the product listing carefully.
Mains vs Battery Power
UK building regulations require mains-powered (hardwired) smoke alarms with battery backup in new builds. If you’re retrofitting into an older property, battery alarms are simpler — no electrician required. Modern sealed lithium battery alarms (like the FireAngel 2620 or X-Sense Link+) now offer 10-year battery life, meaning no annual battery changes.
Interlink: Wired vs Wireless
Interlinked alarms are strongly recommended (and required in new Scottish builds). When one triggers, they all trigger. This is critical in a two-storey or larger home — a fire starting in the kitchen at 2am needs to wake someone sleeping in the loft conversion.
Most smart alarms now offer wireless interlink. FireAngel and X-Sense use dedicated 868MHz radio (more reliable than Wi-Fi through walls). Nest Protect uses its own 802.15.4 protocol. Check that all alarms in a wireless interlink system are from the same brand — cross-brand wireless interlink generally doesn’t work.
How Many Smoke Alarms Do I Need?
The UK government and fire services recommend:
- At least one smoke alarm on every floor
- A smoke alarm in the hallway and landing (escape route)
- A heat alarm in the kitchen (not a smoke alarm — too many false alarms)
- A CO alarm in any room with a gas appliance or open fire
For a typical 3-bedroom semi-detached home, you’ll typically need: 1 ground floor smoke alarm (hallway), 1 first floor smoke alarm (landing), 1 heat alarm (kitchen), 1 CO alarm (boiler room or kitchen). That’s four units minimum.
Do Smart Smoke Alarms Need a Subscription?
Good news: most smart smoke alarms in the UK do not require a subscription for basic app alerts and smart home integration.
- Google Nest Protect: No subscription. Full features included.
- FireAngel Pro Connected: No subscription. App alerts are free.
- X-Sense Link+: No subscription.
- Ajax FireProtect 2: No subscription for the alarm itself, but professional monitoring (optional) typically costs £15–£30/month via your installer.
- Kidde Smart: No subscription for app alerts.
This puts smart smoke alarms ahead of smart security cameras in the subscription stakes — many camera brands charge for cloud storage, whereas alarms just alert and done.
Smart Smoke Alarms vs Standard Alarms: Is the Upgrade Worth It?
A basic ionisation alarm from Argos costs £5. A Google Nest Protect costs £109. Is the difference worth it?
If you’re home all the time and react instantly to an alarm, possibly not. But consider this scenario: you’re at work, your teenage son has left a candle burning. A basic alarm beeps in an empty house. A smart alarm sends you a notification immediately, letting you call home or alert a neighbour.
For families with children home alone, elderly relatives, or simply people who travel regularly, a smart alarm isn’t a luxury — it’s a meaningful safety upgrade. At £35–£50 per unit for FireAngel Pro or X-Sense, the premium over a basic alarm is modest.
Installation: How Hard Is It?
Battery smart smoke alarms are DIY-friendly — screw the backplate to the ceiling, twist the alarm onto it, download the app, connect to Wi-Fi. Most people can do this in under 10 minutes per alarm.
Mains-powered alarms require a qualified electrician to connect the hardwire supply, especially in new builds or where you’re replacing an existing hardwired alarm. Budget around £50–£80 per alarm for professional installation if you’re going mains-powered.
If you’re planning a full smart home setup, see our guide to smart home installation costs for a full breakdown of what to expect.
Frequently Asked Questions
What is the best smart smoke alarm in the UK in 2026?
The Google Nest Protect is the best overall smart smoke alarm available in the UK — it offers dual smoke and CO detection, Google Home integration, app alerts, and the most polished user experience. For a more affordable option, the FireAngel Pro Connected or X-Sense Link+ Pro both offer solid smart features at a fraction of the price.
Do smart smoke alarms work with Alexa?
Some do — Kidde smart alarms integrate with Alexa via the RemoteLync module, and Alexa can announce smoke alerts across your Echo speakers. X-Sense also offers limited Alexa integration. Google Nest Protect works natively with Google Home and Google Assistant, but not Alexa.
Is a smart smoke alarm worth the money?
Yes, for most households. The ability to receive phone alerts when you’re away from home — and to silence false alarms remotely — is a genuine safety and convenience upgrade over standard alarms. Budget options like FireAngel Pro Connected and X-Sense Link+ start from around £30–£35, making the premium over a basic alarm very modest.
How many smoke alarms do I need in a UK home?
At minimum, one smoke alarm on every floor (in the hallway/landing), plus a heat alarm in the kitchen. For full compliance and safety in a 3-bed semi, you typically need 4 units: two smoke alarms, one heat alarm, and one CO alarm. Scotland has more prescriptive requirements since 2022.
Do UK smart smoke alarms require a subscription?
No. The leading UK smart smoke alarms — Google Nest Protect, FireAngel Pro Connected, and X-Sense Link+ — all provide app alerts and smart home integration without a monthly fee. Professional monitoring (via Ajax or a security company) is optional and does carry a monthly cost.
What type of smoke sensor is best?
Optical (photoelectric) sensors are recommended for most rooms in UK homes — they detect slow-smouldering fires more reliably and generate fewer false alarms from cooking. Dual-sensor alarms combining optical and heat detection offer the best all-round protection. Avoid ionisation-only sensors in kitchens.
Our Recommendation
If budget isn’t a concern and you’re on Google Home: buy the Google Nest Protect. It’s the best smart smoke alarm you can buy in the UK, full stop.
For most UK homeowners: the FireAngel Pro Connected range hits the sweet spot — genuinely smart, UK-made, UK regulation compliant, no subscription, and affordable enough to kit out a whole house. The battery-powered FP2620W2-R is the easiest starting point.
On a tight budget: the X-Sense Link+ Pro gives you wireless interlink and app alerts for around £25 per unit — excellent value for whole-home coverage.
Whichever you choose, pairing your smoke alarms with a broader smart home security setup is worth considering. See our guides to the best smart doorbells, best smart security cameras, and the best smart home system for Alexa for a complete picture.
Smart Home UK Team - UK smart home enthusiasts who test, review and compare products. Independent. Honest. No sponsored placements.