Ontario’s carbon monoxide alarm requirements expanded significantly as of January 1, 2026, and a lot of homes that were compliant last year aren’t anymore. Smoke and CO alarm installation hamilton homeowners can rely on brings your home up to the current Fire Code, properly placed and interconnected.
Smoke and co alarm installation hamilton homeowners need has gotten more involved than most people realize, and it changed recently. Ontario updated its Fire Code effective January 1, 2026, significantly expanding where carbon monoxide alarms are required in existing homes, not just new construction. A single alarm near the bedrooms that used to satisfy the requirement often no longer does, and a lot of otherwise diligent homeowners are unknowingly out of compliance simply because the rule changed under them.
Mercanti Electric installs and wires smoke and CO alarms across Hamilton and the surrounding area, whether that’s bringing an existing home up to the current Fire Code, wiring interconnected alarms as part of a renovation, or setting up a new system from scratch. Joseph Mercanti brings 13 years of electrical experience and full ESA/ECRA licensing (#7017086) to every installation, so your alarm placement actually meets the requirements that apply to your specific home.
Alarm requirements depend heavily on your home’s specific layout, heating system, and whether it has an attached garage, which means a generic alarm package rarely gets it exactly right. We assess your specific home against the current requirements before recommending what needs to be installed or added.
This is genuinely new, and it affects far more homes than most people expect. As of January 1, 2026, under updated Ontario Fire Code requirements, homes with a fuel-burning appliance, a fireplace, an attached garage, or heating supplied by fuel-burning equipment located outside the home now need a CO alarm on every storey of the home, including floors without a sleeping area, in addition to the alarm required adjacent to each sleeping area. Previously, many homes were considered compliant with a single alarm positioned near the bedrooms. Under the current requirement, a home with a gas furnace in the basement and bedrooms upstairs needs an alarm on the basement level as well, not just outside the bedrooms.
This change applies to existing homes, not just new construction, which means a home that was fully compliant under the previous rules may no longer meet the current standard without adding alarms. It’s a straightforward fix once you know what’s required, but it’s easy to miss if you haven’t specifically checked your coverage against the updated Fire Code. We assess your home’s heating system, garage, and layout against the current requirement and install whatever coverage is missing.
This is a common point of confusion, and it matters because the two devices aren’t interchangeable and don’t satisfy each other’s requirements. A smoke alarm detects the products of combustion from fire and is required in every Ontario home regardless of heating type or garage. A CO alarm detects carbon monoxide, a colourless, odourless gas produced by fuel-burning appliances, and it’s only required in homes that have a specific CO source, a fuel-burning appliance, a fireplace, an attached garage, or fuel-fired heating supplied from outside the home. A home without any of these sources isn’t required to have a CO alarm, while every home needs smoke alarms regardless.
Combination smoke and CO alarms exist and can simplify installation in homes that need both, but it’s worth knowing they’re doing two genuinely different jobs, detecting two different hazards, rather than one device covering both requirements by default. We assess which alarms your specific home actually needs, rather than assuming one type covers everything.
New construction and extensive renovations in Ontario have required interconnected, hardwired smoke alarms with battery backup since 2015, meaning an alarm triggered anywhere in the home sounds everywhere in the home simultaneously. That’s still the standard for new builds and major renovations. What’s changed more recently is that Ontario’s Building Code now also permits wireless interconnected smoke alarms as an option in certain situations, including secondary suites, which gives homeowners a genuine alternative to running interconnection wiring through finished walls in cases where a full rewire isn’t otherwise part of the project.
For smoke and CO alarm installation hamilton renovations that open up walls, hardwired interconnection is usually the more permanent and reliable solution, while wireless interconnection can be the more practical option for retrofitting an existing finished home. We recommend the right approach based on your home’s construction stage and existing wiring, rather than defaulting to whichever is easier to sell.
We review your home’s layout, heating system, garage, and existing alarm coverage against current Fire Code requirements.
We identify exactly which alarms are missing or need replacement, and where they need to be installed.
We install and wire smoke and CO alarms, hardwired and interconnected where required, or wireless interconnected where appropriate.
We test the full system to confirm every alarm functions and interconnects correctly.
Where the work involves an ESA permit, we pull it and provide the resulting documentation for your records.
A poor alarm installation is easy to overlook until it matters, since a missing or non-functional alarm is invisible until there’s an actual emergency. Watch for an installer who doesn’t ask about your home’s heating system or garage before recommending CO alarm coverage, since that’s what determines whether and where they’re required. Be cautious of anyone who installs smoke alarms without addressing CO requirements separately, treating the two as interchangeable when they’re not. A proper installation should leave you with alarms correctly matched to your home’s actual Fire Code requirements, properly interconnected, and tested to confirm they work as a system, not just individually.
Mercanti Electric provides smoke and CO alarm installation services throughout:
Get your home assessed against the current 2026 Fire Code and any missing coverage installed properly.
If your home has a fuel-burning appliance, a fireplace, an attached garage, or fuel-fired heating from outside the home, yes. As of January 1, 2026, Ontario’s Fire Code requires CO alarms on every storey of qualifying homes, including floors without bedrooms, in addition to the alarm required near sleeping areas.
Only if your home has a qualifying CO source, a fuel-burning appliance, a fireplace, an attached garage, or heating supplied by fuel-burning equipment outside the home. A home without any of these isn’t required to have a CO alarm, though smoke alarms are still required regardless.
Combination alarms exist and can simplify installation, but they’re still detecting two separate hazards with two separate requirements. We confirm your specific home’s smoke and CO alarm needs before recommending combination or separate units.
It depends on your home’s age and construction status. New construction and extensive renovations since 2015 require interconnected, hardwired alarms. Existing homes not undergoing that level of renovation may not be required to interconnect, though it’s strongly recommended for safety.
In certain situations, yes, Ontario’s Building Code now permits wireless interconnection in some cases, including secondary suites. Whether it’s the right choice depends on your specific situation and renovation status.
The most reliable way is a professional assessment against your home’s specific heating system, garage, and layout. Given how recently the CO alarm requirements changed, a lot of homes that were previously compliant now need additional coverage.
Both have a manufacturer-rated service life, typically printed on the unit itself, after which they need to be replaced even if they still appear to function. We can assess the age of your existing alarms as part of a coverage review.
