After the Markham House Fire — A REALTOR’s Guide to Home Fire Safety Every Homeowner Needs to Read

House fires in Markham are not abstractions. They happen in established family homes in Wismer Commons where a natural gas furnace develops a fault. They happen in Unionville condos where cooking fires go undetected. They happen in older Markham Village homes where outdated electrical systems create ignition risks that decades-old wiring was never designed to handle. And they happen because homeowners believe fire safety is something they will attend to eventually — and eventually sometimes never comes.

Michael John Lau, Markham’s top REALTOR® and CPA/CMA, has been involved in transactions following house fires on more than one occasion. The financial, legal, and human consequences are devastating. This guide covers every fire safety obligation and best practice that every Markham homeowner should implement today.

The 2026 Ontario Fire Code — What Is Now Mandatory

Smoke Alarms. Smoke alarms are required on every storey of every residential occupancy in Ontario, including the basement. They must be installed outside each sleeping area and on every floor level without a sleeping area. Smoke alarms must be interconnected — if one sounds, all sound simultaneously — in new construction. For existing homes, interconnected alarms are strongly recommended though not mandatory in all configurations.

Carbon Monoxide Alarms. As of January 1, 2026, CO alarms are now required on every storey of any home with a fuel-burning appliance, fireplace, or attached garage — not just near sleeping areas. This is a new requirement that significantly expands the CO alarm obligations for most Markham homeowners. See the dedicated CO alarm blog for full details.

Testing and Maintenance. Test smoke and CO alarms monthly using the test button. Replace batteries annually on non-sealed units. Replace the entire alarm unit every 10 years — smoke alarms have a finite lifespan that most homeowners do not know about, and a 12-year-old smoke alarm may not detect smoke as reliably as a new one even if it passes a button test.

The Electrical System — Markham’s Most Overlooked Fire Risk

Electrical failure is one of the leading causes of residential fires in Ontario. Markham’s housing stock — which includes thousands of homes built between 1965 and 1985 — is disproportionately affected by two specific electrical risks.

Aluminum wiring was installed in approximately 70% of Canadian homes built between 1965 and 1975. Aluminum wiring expands and contracts at different rates than the copper hardware at outlets and switches, creating loose connections that generate heat over time. The ESA estimates that homes with original aluminum wiring and unaddressed connections are significantly more fire-prone than homes with copper wiring. The solution is either complete rewiring to copper or the installation of approved aluminum-to-copper pigtail connections at every outlet and switch — a job for a licensed electrician, not a DIY project.

Overloaded electrical panels. Older Markham homes with 60-amp or 100-amp service panels are frequently operating beyond their designed capacity as modern households add EV chargers, high-draw appliances, and home office equipment. Signs of an overloaded panel include frequently tripping breakers, flickering lights, and outlets that feel warm to the touch. A licensed electrician should assess any Markham home where these symptoms are present.

The Kitchen — Where Most Markham House Fires Start

Unattended cooking is the leading cause of residential fires in Ontario. For Markham homeowners, a few specific habits eliminate the majority of kitchen fire risk: never leave cooking unattended on a stovetop, keep flammable materials away from cooking surfaces, and have a working kitchen fire extinguisher mounted within reach — not stored under the sink where it cannot be accessed in the critical first seconds of a grease fire.

Escape Planning — The Step Most Families Skip

Every Markham household should have a fire escape plan that every family member knows and has practiced. Two exits from every room where possible. A designated meeting spot outside the home. A clear protocol for who is responsible for children, elderly family members, and pets. Practice this plan with your family at least once per year — ideally after changing smoke alarm batteries in the fall.

For Markham homeowners with legal basement apartments, the escape planning obligation extends to your tenant. Ensure your tenant knows the secondary egress routes from their unit, that all egress windows open freely and are not blocked by furniture, and that the interconnected smoke alarms between units are working and audible in both spaces.

The Home Insurance Dimension

A house fire in a Markham home that does not comply with the Ontario Fire Code’s smoke alarm and CO alarm requirements creates significant insurance exposure. Most home insurance policies contain clauses that can affect coverage when local safety code requirements are not met. This is not theoretical — insurers investigate compliance as part of major claims. The cost of buying and installing compliant smoke and CO alarms is a few hundred dollars. The cost of a denied insurance claim following a fire in a non-compliant home is potentially catastrophic.

Michael John Lau, Markham’s top REALTOR®, makes fire safety compliance a standard pre-listing checklist item for every Markham seller. For buyers, it is a standard item to verify during the home inspection condition period. For all homeowners — this is the guide that protects the most important investment you own.

Frequently Asked Questions

What are the smoke alarm requirements in Ontario for 2026?

Smoke alarms are required on every storey of every residential occupancy, including basements. They must be installed outside each sleeping area. As of January 1, 2026, CO alarms are also required on every storey for homes with fuel-burning appliances or attached garages.

Is aluminum wiring a fire risk in Markham homes?

Yes. Approximately 70% of Canadian homes built between 1965 and 1975 have aluminum wiring, which expands and contracts differently than copper, creating loose connections and heat. It requires inspection by a licensed electrician.

Does fire safety compliance affect home insurance claims?

Yes. Most insurance policies require compliance with local safety codes. A fire in a home without compliant smoke or CO alarms can lead to denied claims or significant liability issues.