Smoke and Carbon Monoxide Alarms: What UK Landlords Must Get Right

Why this trips up more landlords than EICR or Gas Safety

Smoke and carbon monoxide alarm rules feel simple on the surface — fit a smoke alarm, job done. In practice, this is one of the most commonly misunderstood compliance areas in the private rented sector, because the requirements changed in recent years and many landlords are still working from what they installed a decade ago. Unlike Gas Safety or EICR, there's no annual certificate to remind you it needs attention, so it quietly falls off the radar until something goes wrong — a tenant complaint, an insurance query, or worse.

This guide covers what current government guidance expects, where landlords most often get it wrong, and how to build alarm checks into your routine rather than treating them as a one-off install.

What the rules generally require

General guidance for private rented properties in England requires at least one smoke alarm on every storey used as living accommodation, and a carbon monoxide alarm in any room used as living accommodation that contains a fixed combustion appliance (a gas boiler, wood burner, or similar) — not just solid fuel appliances as was once the case. Wales and Scotland have their own frameworks, and Scotland's standard is generally stricter, so if you let across borders, don't assume one set of alarms satisfies every property.

Because the specifics (which rooms, which appliance types, whether it's every letting or only new ones) are the kind of detail that gets updated, we'd rather point you to current government guidance than assert exact wording that might be a year out of date by the time you read this. What doesn't change is the principle: if a room is lived in and has a combustion appliance, you almost certainly need a CO alarm there, and every storey needs smoke coverage. This is informational guidance, not legal advice — check current government guidance or take professional advice for your specific property.

The failure landlords actually get caught by

Two mistakes show up again and again in practice.

The first is treating installation as the finish line. Alarms need to be in working order at the start of every new tenancy, which means testing them — not just glancing at them — before a tenant moves in. A landlord who fitted alarms five years ago and never checked them again may find, at the worst possible moment, that the batteries have died or the unit itself has reached end of life. Most smoke alarms have a service life of around ten years, printed on the back of the unit.

The second is assuming a tenant removing or disabling an alarm is entirely their problem. It's understandable — a beeping alarm at 3am because of a low battery, or one that goes off every time someone cooks, gets pulled off the ceiling by a frustrated tenant. But if it's not working when it matters, the fact a tenant caused that doesn't make you compliant. It makes the case for interlinked, mains-wired alarms with battery backup where practical, and for building a simple check into tenant communications: report a beeping or disabled alarm immediately, no questions asked about why.

Building this into your routine instead of your memory

The reason Gas Safety and EICR get done reliably is that they have a certificate and a clear renewal date. Alarms don't — which is exactly why they need a deliberate process rather than good intentions.

A workable routine looks like this: test and log alarms at every change of tenancy, and again at your annual gas safety visit if you have one, since an engineer is already in the property. Keep a simple record of the test date and outcome for each property — not because it's always a legal requirement, but because if a claim or dispute ever arises, being able to show you checked is far stronger than asserting you probably did. Replace alarms proactively as they approach their stated service life rather than waiting for a failure to tell you.

This is also where the difference between compliance and good property management shows up. The floor is having a working alarm in the right room. The ceiling is a tenant who knows exactly what to do if an alarm sounds, a landlord with a dated record of every test, and a property where nobody's guessing whether the last check was six months ago or three years ago.

Where CertMinder UK fits

CertMinder UK doesn't sell smoke or CO alarms, and we don't take a cut if you buy them from any particular supplier — we're not part of that trade, and we think landlords should know when a platform is. What we do is give you a place to log alarm checks alongside your Gas Safety, EICR, and EPC records, with reminders before things lapse, so "we probably checked that" becomes "checked on this date, here's the record." Visibility into what's actually been done, and when, is the baseline every landlord and agent should expect — not a premium feature.

If you're not sure your current alarm setup matches the latest guidance for your property type, that's worth ten minutes checking against current government guidance before your next tenancy starts, not after an incident makes you look.