Smoke and CO Detectors: What Sellers Need to Know Before Closing

Here I am again. Lowe’s. Drumroll please... smoke and CO detectors.

If you’re selling your home, there’s a good chance you’ll end up here too. It happens more than you’d think. A home inspection from the fire department, something’s missing, and now you’re standing in the detector aisle trying to figure out which one you actually need.

Let me save you some time.

Why This Matters at Closing

In Massachusetts, sellers are required to obtain a smoke detector and carbon monoxide certificate before closing. The fire department comes out, inspects the home, and either issues the certificate or tells you what needs to be corrected.

Don’t skip this. Don’t put it off. It’s not optional, and it will hold up your closing if it’s not done. This needs to be completed at least two weeks before your closing date. Give yourself enough time to schedule the inspection, correct anything they flag, and get the certificate in hand before anyone’s sitting at the closing table.

Getting the Right Detector Is Not as Simple as It Sounds

This is where people get tripped up. You walk into the store and suddenly there are a dozen options staring at you. Here’s what you’re actually looking at:

Plug-in carbon monoxide detectors. These go into an outlet. Easy to install, and flexible depending on how many outlets you have.

Battery-operated CO detectors. No outlet needed. Mount them where the code requires, not where the outlet happens to be.

Combination smoke and CO detectors, wired. These are hardwired into your home’s electrical system. Common in newer construction.

Combination smoke and CO detectors, battery operated. Standalone units. No wiring required.

The right detector depends on your home’s age, your current setup, and what your town’s fire department requires. Town ordinances can exceed state code standards, so what’s acceptable in one town may not pass in another. If you’re not sure, don’t guess. Call the fire department and ask.

Let the Fire Department Come Out First

Today, the fire department was kind enough to come to the house ahead of time to tell me exactly what was needed. That is a gift. Take it if it’s offered.

He asked for a battery-operated combination smoke and CO unit. When I got to the store, they were out of stock. I texted him, explained the situation, and he said individual units were fine. Done.

The point is, communicate. Don’t assume. If what you need isn’t available, ask if there’s an acceptable alternative before you start buying the wrong things.

A Word About the Fire Department

I have to say this because I mean it.

When a fire department goes out of their way to come to a home before the inspection, to walk through, tell sellers exactly what’s needed, and make the process easier, that’s above and beyond. They don’t have to do that. They have real emergencies. Real calls. Real stakes.

So if your fire department offers to do a pre-inspection walkthrough, say yes. Say thank you. And mean it.

To every fire department that helps sellers through this process: thank you. It matters more than you know.

Don’t Leave Without the Receipt

Grab your receipt before you leave the store. If a device doesn’t work or turns out to be the wrong one, you’ll need it to return it. Don’t toss it.

The Bottom Line

Smoke and CO detectors are one of those closing requirements that sneak up on sellers. They can be expensive and cumbersome. Most of the time they’re straightforward, but they do need to be the right type, in the right location, and approved by your fire department before you can get your certificate and before you can close.

Get it on your list early. Give the fire department enough time to schedule. And if they offer to come out ahead of the inspection, take them up on it.

We got our smoke certificate today. Forwarding it to the attorneys now.

One more thing handled. Let’s close this.