How Markham Homeowners Can Unlock Rental Income, Increase Their Home's Value, and Stay on the Right Side of the Law
There are few financial decisions a Markham homeowner can make that deliver as consistently strong a return as a well-built, properly permitted legal basement apartment. In a city where average rents for one-bedroom unfurnished units in Markham reached $2,287 in July 2025, surpassing even Downtown Toronto, making Markham the most expensive municipality to rent in across the entire GTA, the economis of basement rental income are compelling. A properly constructed two-bedroom legal basement apartment in Markham can generate $2,200 to $2,800 per month in rental income, $26,400 to $33,600 per year, from space that currently sits unused beneath your feet.
But the difference between a legal basement apartment and an illegal one in Markham is not just a matter of paperwork. It is the difference between a valuable, insured, income-producing asset and a serious liability, one that can void your homeowner's insurance, expose you to significant fines, and in a worst-case scenario, put your tenants' lives at risk and your financial future at stake.
Michael John Lau and Neeraj Moolchandani are REALTORS®️ and top Markham real estate specialists at Kaizen Real Estate who help Markham homeowners understand how a legal basement apartment affects their property's value, marketability, and financial performance. This is the complete guide to creating a legal basement rental apartment in Markham, Ontario, from understanding the city's specific regulations to navigating permits, meeting building code requirements, accessing government financing, and finding and managing great tenants.
Part One: What Markham's Rules Actually Say About Basement Apartments
Before you hire a contractor, buy a single sheet of drywall, or tell your neighbour you are planning a basement rental, you need to understand Markham's specific regulatory framework. This is where Markham differs meaningfully from Toronto, Mississauga, and many other GTA municipalities.
The Current Regulatory Landscape in Markham
Basement apartments are generally not permitted in Markham, except for those that were legally in existence prior to November 16, 1995, and in certain areas of Markham Centre, Cornell, and Cathedraltown. Basement apartments that were in existence prior to November 16, 1995, are permitted by provincial legislation under Section 76 of the Planning Act.
This is critical information that many Markham homeowners, and even some contractors, are not fully aware of. Markham's zoning framework has historically been more restrictive than neighbouring municipalities regarding second suites, and homeowners cannot simply proceed with a basement apartment renovation the way they might in Toronto or Mississauga without first confirming their specific property's eligibility.
Before constructing a second suite in Markham, homeowners must contact Building Standards at 905-475-4870 to determine if they are allowed in their specific area. This is the single most important first step for any Markham homeowner considering a basement apartment. Call the city before you do anything else.
The Good News: Markham Is Actively Expanding Permissions
The regulatory landscape in Markham is evolving significantly and in a homeowner-friendly direction. The Ontario Planning Act permits up to two Additional Residential Units on most properties where single-detached, semi-detached, and townhouses are permitted. The City of Markham is updating its Official Plan and Zoning By-Laws to allow up to three Additional Residential Units, four residential units total, on most residential properties. This initiative is part of a broader effort by the City to create more housing options in Markham and is part of Markham's approved Housing Accelerator Fund Action Plan. Markham City Council endorsed this direction in December 2023.
An Additional Residential Unit is a separate living space with its own kitchen, bathroom, and separate entrance. These units are often called a secondary suite, a basement apartment, a coach house, a laneway suite, a granny flat, or an additional dwelling unit.
Additionally, the City of Markham has been supporting the creation of basement apartments, as provided for in the City's Official Plan, through applications to the Committee of Adjustment, where each individual site is reviewed for its suitability taking into consideration neighbourhood compatibility, building type, size of unit, parking standards, and external appearance of the building.
The practical takeaway for Markham homeowners is that the direction of travel is clearly toward greater permission for basement apartments and secondary suites. If your specific property is in a zone where a basement apartment is not currently permitted as of right, a Committee of Adjustment application may be the path forward. For properties in Cornell, Cathedraltown, and Markham Centre, as well as any home where a legal suite existed before November 16, 1995, the permissions are already in place.
Registration Is Mandatory
Whether your basement apartment was built with permits or pre-dates the 1995 cutoff, Markham requires registration. All two-unit houses must be registered with the City. Both units will be inspected by City officials to ensure compliance with building and fire safety standards. This helps ensure the safety of both owners and tenants. If you own an existing two-unit home, call Markham Fire and Emergency Services at 905-415-7521 to arrange for a fire inspection. Register the home with the City of Markham as a Two-Unit House by completing the Two-Unit House Declaration Form and submitting it with the registration fee to the Clerk's Department at City Hall, 101 Town Centre Boulevard, Markham, Ontario, L3R 9W3.
Start Your Markham Basement Apartment Journey With the Right Guidance
Creating a legal basement apartment in Markham, Ontario is one of the smartest financial decisions a homeowner in this city can make right now, but only if it is done correctly, with permits, to code, and fully registered with the City. The difference between a permitted legal suite and an illegal one is not just regulatory compliance. It is the difference between a genuine asset and a liability hiding beneath your floorboards.
Michael John Lau and Neeraj Moolchandani at Kaizen Real Estate help Markham homeowners understand exactly how a legal basement apartment affects their property's value, how to position a home with a legal suite for maximum impact in the Markham real estate market, and what buyers are actually willing to pay for permitted rental income in Markham's communities. Whether you are building a new suite, legalizing an existing one, or preparing to sell a home with a basement apartment, Michael John Lau and Neeraj Moolchandani bring the local market knowledge to guide every decision correctly.
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Important disclaimer: Building code requirements, zoning bylaws, and municipal regulations change frequently. All information in this guide is based on publicly available sources as of March 2026 and is provided for general informational purposes only. Before undertaking any construction, renovation, or permit application, Markham homeowners must verify current requirements directly with the City of Markham Building Standards Department at 905-475-4870 and consult with a qualified Ontario contractor, architect, and real estate lawyer. Michael John Lau and Neeraj Moolchandani and Kaizen Real Estate are real estate professionals, not building code authorities, and this guide does not constitute legal, building, or engineering advice.