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Matter smoke or CO alarm on Home Assistant

For smoke and CO alarms, Home Assistant supports pairing, control and automation triggers. It does not support automation actions. Our confidence in this answer is High.

High confidence
2026-10-18 last checked
3/4 capabilities confirmed

At a glance

AnswerHome Assistant
PairingY
ControlY
Starts an automationY
Controlled by an automationN
ConfidenceHigh
Matter spec1.2+

Y = confirmed for this device type, Partial = works with limits, N = not supported by this platform, Unknown = not enough dated evidence. These are type-level answers, not a guarantee for one product.

What this means

All four answers are confirmed for this device type on this platform. Individual products can still implement less than the device type — check the product notes before you buy.

Requirements

Hub requirement: Home Assistant Matter Server (HA OS recommended). Thread border router for Thread devices.

Matter spec: 1.2+.

Confidence

We have direct, dated evidence for most of these answers, including native hands-on reports where available.

Last checked 2026-10-18. The answers above come from the published type matrix; the sources below are what they rest on.

Sources

Showing the 8 most recent of 10 recorded sources.

Frequently asked questions

Does a Matter smoke or CO alarm work with Home Assistant?

Home Assistant pairs a Matter smoke or CO alarm and reports alarm state — a life-safety device where a confirmed trigger matters more than price. High confidence, checked 2026-10-18. Home Assistant can control a Matter smoke or CO alarm from its app, including alarm state (High, checked 2026-10-18).

Can Home Assistant start an automation from a Matter smoke or CO alarm?

Yes — a Matter smoke or CO alarm that is sounding can start a Home Assistant automation, though the alarm must also stand alone. As an action, Home Assistant cannot use a Matter smoke or CO alarm in an automation (High, checked 2026-10-18).

What do I need to add a Matter smoke or CO alarm to Home Assistant?

Home Assistant needs a Matter controller before a Matter smoke or CO alarm will report.

Next steps

Other platforms for smoke and CO alarms

Informational only — verify before you buy. How we check · All smoke and CO alarms across platforms