The Landlord's IoT Playbook: 7 Sensors for Multi-Unit Properties

You can inspect a unit once a month if you are lucky. Between visits, anything can happen. A tenant leaves a window open during a cold snap. A water heater starts leaking behind a wall. A sump pump fails during the one storm of the year it actually mattered.

Water leak detection alone covers one risk. Managing five, ten, or fifty units means you need remote property monitoring across all of them at once, not a single sensor in a single unit.

This is where most landlords stop at "smart enough" instead of "actually covered."

How Monnit Works

Sensor — placed at the risk points in each unit.
Gateway — one or more gateways connect the sensors across the property, depending on building size and layout.
iMonnit — applies the rules and thresholds you set, per sensor.
Alert — sent to your phone, naming the sensor and the unit.
Action — you decide whether it needs a call, a maintenance visit, or nothing at all.

The Seven Sensors Worth Deploying

1. Water leak detection. The most common and most expensive failure point. Placed near water heaters, under sinks, and behind washing machines.

2. Temperature and freeze risk. Especially critical in units where heat could fail or be turned down between tenants. See Freeze Alarm for Cabins for how this works in an unattended unit.

3. Humidity. Sustained high humidity can flag a ventilation problem, persistent dampness, or another developing issue, often before it becomes visible damage.

4. Door and window open/closed status. Useful for confirming a unit is secured, and for catching a window left open that is driving up a freeze risk.

5. Power and voltage monitoring. A power outage that knocks out a sump pump or a furnace is often the actual root cause behind a flood or freeze event, not the weather itself.

6. Equipment and HVAC monitoring. Current and voltage sensors can track whether a furnace, pump, or other piece of equipment is drawing power normally, flagging a stall or failure before it becomes a bigger problem.

7. Sump pump condition. There is no single plug-and-play "sump pump sensor." In practice this means monitoring the pump's power draw or a compatible dry-contact signal from the pump, controller, or associated equipment where available, alongside a water sensor nearby as a backup layer, so you know if the pump has stopped cycling rather than only finding out once the basement is already wet. See Your Sump Pump Will Fail During a Storm for the full picture on this failure mode.

You do not necessarily need all seven in every unit. The point is to select the risks that matter at each location and manage them through one monitoring platform.

How It All Connects

Seven sensor types across ten units is nothing on its own if the data does not reach you in a usable form. That is what the gateway and iMonnit software do.

One or more gateways connect the sensors across the property, depending on building size, construction, range, and sensor count. Within a building, many sensors can report through a shared gateway rather than requiring a gateway in every unit, so covering a full property is a matter of network design, not buying a separate gateway for every room. From there, iMonnit applies the rules you have set and pushes alerts to your phone. One account, every property.

Naming matters here. Instead of a generic "Sensor 14," you would set up something like:

• Unit 204 Water Heater
• Building B Mechanical Room
• Unit 108 Freeze Alert
• North Building Sump Pump

That is what turns "one dashboard" from an abstract pitch into something you would actually use at 11pm when an alert comes in.

The Cost Math for Multi-Unit Owners

One undetected leak in a multi-unit building rarely stays contained to one unit. Water travels down. A leak on the third floor becomes a claim on the second and first floors as well, along with common area damage and displaced tenants, the same pattern covered in The Basement Flooded on a Tuesday.

Monitoring cost per unit is a fraction of a single claim, and the value compounds with every additional unit under management. A ten-unit building with sensors placed at the key risk points is a rounding error next to the cost of one undetected flood affecting three units.

Which Bundle Fits

• Acreage Protect: Extended range makes this a strong fit for spread-out multi-building properties.
• Vacant Property Protect: Ideal for units between tenants, when risk is highest and nobody is checking daily.
• Mechanical Room Protect: Built specifically for shared mechanical spaces in larger buildings, where a single failure point can affect every unit above it.

For portfolios spanning several buildings, multiple bundles report into the same account, giving one central view across every property you manage. See the full lineup, including Cabin, Greenhouse, and Vacation Rental, in the PremiumBackyard Protect collection.

Frequently Asked Questions

Do Monnit property sensors monitor tenants?

These are property-condition sensors, not cameras or microphones. Temperature, humidity, water, power, and equipment sensors monitor the building or equipment. Door and window sensors deserve more careful consideration, since their data can reveal patterns about when a space is being used. Landlords should be transparent with tenants and follow applicable privacy and tenancy requirements when deploying these.

Can I monitor units in different buildings from one account?

Yes. Every sensor and gateway reports to the same dashboard regardless of location, so a portfolio across multiple addresses is fully visible in one place.

Do tenants need to do anything?

No. Sensors are installed by you or your maintenance team and run independently in the background. Tenants do not need an app or any involvement.

What happens when an alert comes in?

You get a notification naming the sensor and the unit. From there, you decide whether it needs a call to the tenant, a maintenance visit, or nothing at all.

Is this worth it for a small number of units?

Even a duplex benefits, since the cost of one undetected leak or freeze event usually exceeds years of monitoring cost. The value scales with unit count, but it starts paying off at almost any size.

Build a Monitoring Plan for Your Properties

You cannot be in ten places at once. Your sensors can be.

Browse PremiumBackyard Protect bundles and get coverage mapped across your portfolio.

Managing multiple properties and want a system mapped out for your specific buildings? Call us and we will help you plan it.

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1-888-851-8852 | sales@premiumbackyard.ca