Sensors that work with Home Assistant

• Zigbee not supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread not supported
• Matter not supported
• BT supported
• not supported

SwitchBot's Outdoor Meter is a battery sensor with no screen — pair it with the app or an HA dashboard for readings, since there's nothing to check on the unit itself. It runs roughly two years on its AAA batteries before a swap, and Bluetooth range is rated to 100m line-of-sight, though expect far less through walls (see the HA integration notes below). The IP65 shell handles rain and dust for genuine outdoor or greenhouse use, and it comes with a lanyard rather than a bracket, so you're hanging it, not screwing it to anything. At £15, still the easiest local-Bluetooth outdoor sensor for HA.

• Zigbee not supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread supported
• Matter supported
• BT not supported
• not supported

One of the few contact sensors officially certified Works with Home Assistant (Matter over Thread), so pairing and long-term support are as safe as it gets. At £24 it still costs roughly double Aqara's own Zigbee door sensor and over three times IKEA's £7 MYGGBETT, which runs the same Matter-over-Thread stack — pick the P2 for the certification and slimmer 77×22×22mm build, not raw capability. It runs on a single CR123A battery rather than the coin cells most rivals use — bulkier in the frame, but fewer battery changes. You'll still need a Thread border router such as HA's Connect ZBT-1 or an Apple/Google hub.

• Zigbee not supported
• Z-Wave supported
• Wi-Fi not supported
• Thread not supported
• Matter not supported
• BT not supported
• not supported

The Z-Wave answer to the frient smoke alarm already on this site, for anyone building a Z-Wave JS network instead of Zigbee — same idea of a smart companion sensor layered on top of your interlinked mains alarms, not a replacement for them. It's an older, well-worn design (Z-Wave Plus, not the newer Z-Wave Long Range chipsets), so expect a smaller, more battery-hungry mesh footprint than FIBARO's current-generation kit, and check current Home Assistant community threads before buying since a handful of users report the smoke entity not showing up cleanly on first pairing with zwave_js.

• Zigbee not supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread not supported
• Matter not supported
• BT supported
• not supported

The affordable route to CO2 monitoring: a genuine NDIR sensor (Sensirion SCD40) plus temperature and humidity on a big desk display for around £60 — half the price of an Aranet4. Reviewers cross-checking it against calibrated meters report readings within about 5%, respectable for this price. The catch is Bluetooth: it only talks to whatever's nearby, so anywhere outside your HA host's BLE range needs an ESPHome proxy or USB Bluetooth adapter in the same room. Best sited in a bedroom or home office, where stale air affects sleep and focus — keep it on a desk away from doors and vents, not a draught. No SwitchBot hub required.

• Zigbee not supported
• Z-Wave not supported
• Wi-Fi supported
• Thread not supported
• Matter not supported
• BT not supported
• not supported

The most Home Assistant-friendly indoor air quality monitor we've tested: open-source hardware and firmware, a native local-polling integration that Home Assistant discovers on its own, and a tick-box at setup that stops it ever talking to AirGradient's servers. It measures far more than the cheap CO2 meters — CO2, PM1/2.5/10, a VOC index, a NOx index, temperature and humidity — with named, replaceable sensor modules (SenseAir S8, Plantower PMS5003, Sensirion SGP41 and SHT40) rather than an anonymous chip. The catches are UK-specific: there is no UK retailer, so you order direct from Thailand in US dollars and pay the VAT at checkout, which lands the assembled unit at roughly £200. The 1.3in OLED is small, and the 131mm square footprint is big next to an Apollo AIR-1 or Aranet4. Buy it if you run Home Assistant and want CO2, particulate and VOC data driving real automations; buy a SwitchBot Meter Pro CO2 or IKEA Alpstuga if you only want a CO2 number on a shelf.

• Zigbee not supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread supported
• Matter supported
• BT not supported
• not supported

At £7 from IKEA UK, this 2026 Matter-over-Thread sensor (successor to the Parasoll) is the cheapest way to cover every door and window in the house, joining Home Assistant's native Matter integration without an IKEA hub. It's genuinely discreet — 82×17×18mm, mounted with adhesive pads rather than screws, so it disappears against a white door frame. Against the Aqara Door and Window Sensor P2 (£27, officially certified Works with Home Assistant), MYGGBETT is under a third of the price for the same contact-and-battery entities. Budget buyers should start here — but read the latency note below before trusting it for anything security-critical; Aqara's mesh reports state changes more consistently.

• Zigbee not supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread supported
• Matter supported
• BT not supported
• not supported

IKEA's 2026 Matter-over-Thread replacement for the Vallhorn, and at £7 it's still the cheapest way to scatter motion sensing around a UK home — you'll need a Thread border router (ZBT-1, Apollo, or an Apple/Google hub) since it won't talk to HA on its own. Two AAA batteries (IKEA recommends its own LADDA rechargeables) last around 15 months, and the IP67 rating means it's happy on a covered porch as well as indoors, not just a hallway ceiling. It's only rated for mounting up to 2m high, so skip it for anything above a standard doorway or stairwell.

• Zigbee not supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread not supported
• Matter not supported
• BT supported
• not supported

The motion sensor for households without a Zigbee stick: it broadcasts open BTHome packets that Home Assistant decodes automatically via any Bluetooth adapter or ESPHome proxy — no hub, no pairing dance. That's the trade Zigbee sensors like the SONOFF SNZB-03 or Aqara motion sensor make you skip: their mesh hops room-to-room off one coordinator, while this one's Bluetooth range tops out around room-scale (roughly 10m indoors) unless you scatter proxies. At 32x42x27mm and 26g, it's compact enough for a shelf corner or door frame, sticks up with the included adhesive pad — no drilling — and adds a free lux sensor; best for single-room triggers, not whole-house coverage.

• Zigbee not supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread supported
• Matter supported
• BT not supported
• not supported

A genuine CO2 plus PM2.5 monitor for £25 is unheard of — under half the SwitchBot Meter Pro CO2's £60 and a sixth of the Aranet4's £169, and IKEA's collaboration with Sensirion (the same sensor maker behind SwitchBot's chip) suggests this isn't a budget knock-off sensor, just a budget price. It speaks Matter over Thread, so it drops straight into HA's Matter integration with no IKEA hub needed if you already have a Thread border router. At a compact 40 x 40 x 90mm it suits a shelf or windowsill; keep it clear of doors, vents and direct sun. Sells out fast at IKEA UK.

• Zigbee supported
• Z-Wave not supported
• Wi-Fi supported
• Thread not supported
• Matter supported
• BT supported
• not supported

The most flexible flood sensor Shelly's made — pick Wi-Fi, Zigbee, Bluetooth or Matter at setup, joining whatever mesh you already run, with a 2m cable extendable to 150m for reaching under a tank or behind an appliance. For most UK Home Assistant users we'd pick Wi-Fi: it's the only mode that gets full local RPC integration via mDNS auto-discovery, no cloud, no extra Zigbee coordinator. Tuck the sensor body out of sight and run the cable to the risk point — under the sink trap, behind the washing machine hose, or along a boiler's pressure-relief pipe. Commit to one radio at pairing; you can't run several at once.

• Zigbee not supported
• Z-Wave not supported
• Wi-Fi supported
• Thread not supported
• Matter not supported
• BT supported
• not supported

Built by the same UK team that runs the Everything Smart Home YouTube channel, and it shows: the board ships bare with two M3 mounting holes rather than a finished enclosure, so out of the box it's a shelf or wall unit — ceiling mounting means printing a community bracket first. At £47 it undercuts the Aqara FP1E by a few pounds while adding PIR, temperature, humidity and light sensors the FP1E doesn't have, plus fully open-source ESPHome firmware you can fork and re-flash. That openness is the real draw for tinkerers; if you just want a sensor that works, the FP1E's finished case is less fuss.

• Zigbee not supported
• Z-Wave not supported
• Wi-Fi supported
• Thread not supported
• Matter not supported
• BT not supported
• not supported

Still the reference mmWave presence sensor for UK living rooms and open-plan kitchens: up to 30 configurable zones across a 40 sqm room (8 m range, 120 degree field of view wall-mounted), so lights never cut out while you sit still. At around £58 it costs roughly £20 more than Aqara's own FP1E, which covers just one zone — pay the premium only if you need per-region control across a large or open-plan space, otherwise the FP1E is the smarter buy. It's mains-powered via USB-C only, no battery, so plan for a socket nearby. Integrates locally with Home Assistant via the built-in HomeKit Device integration over Wi-Fi.

• Zigbee not supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread not supported
• Matter not supported
• BT supported
• not supported

The reference-grade NDIR CO2 monitor: years on two AA batteries, an always-on e-ink display, and a core Home Assistant integration reading it passively over Bluetooth (enable "Smart Home integrations" in the Aranet app first). At around £189 it costs roughly three times the SwitchBot Meter Pro CO2 on this site, and the gap is calibration pedigree: Aranet's NDIR sensor is rated to ±(30 ppm + 3% of reading), tighter than SwitchBot's ±(50 ppm + 5%), and is the sensor independent reviewers reach for to sanity-check cheaper monitors against. Buy this for a CO2 number you trust without question; SwitchBot trades accuracy for half the price.

• Zigbee not supported
• Z-Wave not supported
• Wi-Fi supported
• Thread not supported
• Matter not supported
• BT not supported
• not supported

The Home Assistant crowd's favourite weather station: the solar 7-in-1 WS90 array (sonic anemometer, piezo rain sensor, no moving parts) pushes readings to the GW2000 gateway, which HA's core Ecowitt integration receives locally over your LAN. Buy the UK/EU 868MHz version. Mount the WS90 on a pole with open sky above — trees, chimneys, or roof edges nearby will skew wind readings. "No moving parts" matters here: no tipping-bucket or spinning cups to jam with ice come winter, though the piezo sensor can misfire on fog. Solar power plus 2×AA backup keeps it running through grey UK winters; Ecowitt recommends an optional 12V supply if you expect hard frost or snow.

• Zigbee supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread not supported
• Matter not supported
• BT not supported
• not supported

The cheapest contact sensor we would actually fit to every window: smaller than the old SNZB-04, a tamper alert the Aqara P2 lacks at this price, and unobtrusive enough on a white frame that it doesn't scream 'smart home' to visitors. Sonoff rates the CR2477 coin cell at around five years, realistic if the door isn't opened dozens of times a day. Keep the sensor-to-magnet gap under 20mm when closed — go wider and it'll report false 'open' states. Pairs directly with Zigbee2MQTT or ZHA — ignore the 'Sonoff bridge required' box copy.

• Zigbee supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread not supported
• Matter not supported
• BT not supported
• not supported

The no-display sibling of the SNZB-02D and the cheapest accurate room sensor worth buying: ±0.2°C Swiss-grade sensor, a CR2477 that genuinely lasts years, and first-class Zigbee2MQTT/ZHA support — no Sonoff bridge needed despite the marketing. At 45×45×17.7mm it's small enough to tuck on a shelf or wall in every room without becoming a fixture, unlike the -02D's chunky 2.5-inch display unit. It reports within 5 seconds of any change and at least hourly otherwise, so Home Assistant automations react fast. Buy the -02D only if you want one glanceable reading on a desk; for whole-house heating zoning, scatter several of these instead.

• Zigbee supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread not supported
• Matter not supported
• BT not supported
• not supported

The best-value climate sensor with a screen: a 2.5-inch LCD shows temperature, humidity and a comfort icon at a glance, so you don't need to open the Home Assistant app to check a room. It's noticeably bulkier than the display-less -02P (62.5x59.5x18.5mm vs a slim 45x45x17.7mm) and its CR2450 lasts roughly half as long — around 2 years against the -02P's 4 — the tradeoff for having a screen at all. Buy this one for a single desk, nursery or bedroom where you want a physical readout; for whole-house sensor coverage, the cheaper, smaller -02P scatters better across multiple rooms. Magnetic base and desk-stand mounting both included.

• Zigbee supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread not supported
• Matter not supported
• BT not supported
• not supported

The budget motion pick if you already run a Zigbee coordinator: sub-£15, fast 5-second re-trigger and a built-in lux sensor, with solid Zigbee2MQTT and ZHA support. Ignore the 'Sonoff bridge required' marketing — it pairs straight to any Zigbee 3.0 dongle. Rated 6m range and a 110° field of view, which is narrower than premium PIR sensors like Aqara's, so it suits hallways and doorways better than covering a whole living room from one corner. The CR2477 coin cell claims roughly 3 years, decent for a device this cheap. Mount it where the cone catches the room's main approach path rather than a side wall.

• Zigbee supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread not supported
• Matter not supported
• BT not supported
• not supported

The default leak sensor for Home Assistant households: IP67-rated, CR2032-powered (roughly two years per battery) and instant wet/dry reporting under sinks, washing machines and combi boilers. At under £20 it undercuts most Zigbee alternatives, and its compact 50 × 50 × 15mm puck sits flush against skirting or squeezes into tight spots like behind a toilet or under a dishwasher — floor placement generally beats mounting, since it triggers on the probe pins touching standing water, not humidity. Pairs directly with Zigbee2MQTT or ZHA (model SJCGQ11LM) so you can skip the Aqara hub entirely.

• Zigbee supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread not supported
• Matter not supported
• BT not supported
• not supported

Still the only affordable vibration sensor with proper Home Assistant support, and yes, it's still readily available in the UK via Amazon and Aqara's own shop despite being one of Aqara's older Zigbee designs (first released years ago, largely unchanged since). At a compact 36 x 36 x 9mm it disappears on a window frame, washing machine lid, or drawer front with just the adhesive pad — no screws needed. Sensitivity runs across 21 levels (1 most sensitive, 21 least), so start low on a washing machine to avoid every spin cycle wobble triggering an alert, and turn it up for subtle glass-break or tamper detection on doors and windows.

• Zigbee supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread not supported
• Matter not supported
• BT not supported
• not supported

The best all-round Zigbee PIR for UK Home Assistant users, pairing straight into Zigbee2MQTT or ZHA despite the box insisting you need an Aqara hub. At £18.99 on Amazon UK (RRP £23.99) it costs roughly double the budget SONOFF SNZB-03P, and the extra buys a wider field of view — 170° out to 2m narrowing to 150° at 7m versus SONOFF's fixed 110°/6m — plus numeric lux instead of a dim/bright enum, three-step sensitivity, and a detection interval you can set anywhere from 2 seconds upwards rather than a fixed 5-60s window. Two CR2450 cells claim 5 years against roughly 3. Against Aqara's own newer options the P1 still makes sense: the Motion and Light Sensor P2 moves to Thread/Matter, which means you need a Thread border router and, because Matter only carries the basic occupancy and light readings, its sensitivity and timeout are set in the Aqara app rather than exposed in Home Assistant; the P1 on Zigbee gives you all of that as native HA entities. The FP2 (around £58) is a different tool — a mains-powered mmWave presence sensor that keeps a room "occupied" while someone sits still and can split it into zones, but it needs a USB socket and Wi-Fi. Buy the P1 for hallways, landings, stairs and open-plan spaces where a battery PIR that fires quickly is what you want; buy an FP2 for a living room or office where people sit still; for a doorway or small room, the SONOFF does the job for less.

• Zigbee supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread supported
• Matter supported
• BT not supported
• not supported

A genuinely clever bit of kit — one puck does the job of a door/window contact and a vibration/tilt/fall sensor, so it's brilliant for safes, mailboxes or garden gates where a normal two-part reed switch looks daft. It ships in Thread/Matter mode and needs switching to Zigbee in the Aqara app, and object-monitoring only exists on Zigbee. Don't be fooled by the "outdoor kit" branding — Aqara gives this sensor no IP rating and says outright it isn't waterproof; the bundled cover just keeps off direct rain, so mount it somewhere sheltered. Also handy strapped flat to a wheelie bin lid for a vibration alert if someone's rummaging through it overnight.

• Zigbee supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread not supported
• Matter not supported
• BT not supported
• not supported

The sensible mmWave presence pick at roughly half the price of the FP2, and the right choice for a single room rather than an open-plan floor: it reports one zone, not the FP2's per-region zones, so save the upgrade for multi-zone layouts. Unlike PIR, mmWave detects stillness as well as motion, so it won't switch your lights off while you're sat reading. It pairs straight to Zigbee2MQTT or ZHA over Zigbee, skipping the Aqara hub the box insists on. Mounts on wall, ceiling, or corner via the included magnetic plate or adhesive bracket, with an angled arm for aiming. Mains-powered via a 2 m integrated cable, so plan for a socket nearby.

• Zigbee supported
• Z-Wave not supported
• Wi-Fi not supported
• Thread not supported
• Matter not supported
• BT not supported
• not supported

The Zigbee smoke alarm to buy in the UK: Danish-made (Develco), EN 14604 certified, and it works out of the box in Zigbee2MQTT — the 85dB siren doubles as an intruder sounder when triggered from Home Assistant. Unlike interlinked mains alarms, there's no native RF link between units; sounding several together needs a hub automation, not a built-in mesh. At Ø65x40mm on a magnetic ceiling bracket it's compact and tool-free to fit, but the CR123 battery and hub dependency are why it costs more than a basic £10 mains alarm. Treat it as a smart companion to, not a replacement for, your interlinked mains alarms.