Monitored or DIY alarm: how to pick the right system

A home alarm can bring real peace of mind, but the choices have multiplied. You can pay a company to watch your system around the clock, or install sensors yourself and get alerts on your phone. Neither is right for everyone.

This guide explains the difference, the parts that make up a system, what to check in a contract, and how renters can get protection without drilling holes. It's general information to help you ask the right questions, not a recommendation for any specific product.

Monitored vs DIY: the core difference

With a professionally monitored system, alarms go to a monitoring centre staffed around the clock. When a sensor is triggered, an operator tries to reach you or your emergency contacts and, if needed, can request police, fire or medical help. You pay a monthly fee for that service, sometimes under a multi-year agreement.

With a self-monitored (DIY) system, alerts go straight to your phone and you decide what happens next: check a camera, call a neighbour or call 911. There's usually no required monthly fee, though some brands charge for cloud video storage or extra features. Some DIY systems also let you add professional monitoring month to month, a useful middle ground.

What a system is made of

• Door and window sensors detect when something opens. They're the backbone of most systems.
• Motion detectors cover rooms and hallways. Many can be adjusted so small pets don't set them off.
• Glass-break sensors listen for the sound of breaking glass, which is useful near large windows and patio doors.
• Smoke, carbon monoxide and flood sensors protect against everyday risks, not just break-ins. With monitoring, an alarm can be reported even when no one is home.
• Cameras let you see what's happening indoors or outside, live or in recorded clips.
• Video doorbells show who's at the door and let you talk to visitors from anywhere.
• A hub or keypad ties everything together, arms and disarms the system, and sounds the siren.

Ask how the system communicates. A cellular connection keeps working if your internet goes down or a phone line is cut, and a backup battery keeps things running during a power outage.

Contracts, equipment and installation

This is where the fine print matters most. With monitored systems, equipment is sometimes offered at a low upfront cost in exchange for a monitoring contract. That can be a fair deal, as long as you understand exactly what you're committing to.

• Equipment ownership. If it's leased or tied to the contract, find out what happens to it if you cancel or move.
• Contract length and renewal. Check the term, whether it renews automatically and how much notice you must give to end it.
• Early cancellation. Ask how any fee is calculated if you leave before the term is up.
• Moving. Some companies transfer your service to a new home; others treat a move as a cancellation.
• Price changes. Ask whether the monthly fee can go up during the term.

Professional installation takes the guesswork out of placement and wiring, but may come with a fee. DIY kits are designed for self-installation, often with adhesive mounts and step-by-step app instructions. Either way, test every sensor once it's set up.

Alarm systems are sometimes sold door to door. Québec's Office de la protection du consommateur publishes information on contracts signed at your door and on service contracts, which is worth reading before you sign anything.

Questions to ask before you sign

• Is monitoring included, optional or required, and what does it cost each month?
• How long is the contract, and does it renew automatically?
• Who owns the equipment, and what happens to it if I cancel?
• Are there fees for installation, activation or early cancellation?
• Does the system use cellular, internet or both, and is there a battery backup?
• How does the monitoring centre verify an alarm before sending help?
• Where is camera footage stored, for how long, and does storage cost extra?
• Can the service move with me if I change address?

False alarms and insurance

False alarms are more than an annoyance. They can mean a call from the monitoring centre in the middle of a meeting, worried neighbours and, in some municipalities, a fee if police respond to repeated false alarms. Check your city's rules.

Common causes include a door left ajar, a pet wandering past a motion sensor, a low battery or a guest who doesn't know the code. Give everyone who uses the system a quick walkthrough, use pet-friendly motion settings and replace batteries when the app warns you. With monitoring, ask how the company confirms an alarm before dispatching help, for example by calling you first or checking a camera.

Some insurers may offer a discount on home or tenant insurance for a monitored alarm or other safety devices. Ask yours what qualifies and whether they need a certificate from the alarm company. If you rent, our guide to tenant insurance in Québec explains what a policy covers.

Options for renters

If you rent, a self-monitored kit is often the easiest fit. Wireless sensors with adhesive mounts go up without drilling and come with you when you move. Indoor cameras on a shelf and doorbell cameras that mount without wiring avoid permanent changes.

Check your lease and talk to your landlord before installing anything on the door, in shared hallways or outside the building. In a multi-unit building, cameras that capture common areas or neighbours' doors can raise privacy concerns. Monitored systems can work for renters too; just ask whether the contract moves with you and what happens when your lease ends.

Cameras and privacy

Cameras are useful, but they also collect personal information about you, your family and anyone who passes by. A few habits keep them working for you, not against you.

• Point outdoor cameras at your own property, and avoid capturing neighbours' windows, yards or the street more than you need to.
• Let household members and regular visitors, such as babysitters or cleaners, know where cameras are.
• Find out where footage is stored (on the device, in the cloud or both) and for how long.
• Use a strong, unique password and turn on two-factor authentication for the app.
• Keep firmware and apps up to date, and switch off features you don't need, such as audio recording.

Rules around recording other people can be complex. When in doubt, keep cameras focused on your own space and get reliable advice before recording anyone else.