Unionville is one of Ontario’s most beloved heritage communities — and one of Markham’s most protected ones. The moment you purchase a property inside Unionville’s Heritage Conservation District, you become the steward of a piece of Ontario’s built history. That stewardship comes with rights, responsibilities, financial incentives, and regulatory requirements that are genuinely different from what applies in every other Markham neighbourhood. Michael John Lau, top real estate agent in Markham Ontario, ensures every buyer considering a Unionville heritage property understands these requirements before they close — because discovering them after possession is a far more expensive education.

What the Heritage Conservation District Actually Protects

Under Part V of the Ontario Heritage Act, Markham has protected four areas as Heritage Conservation Districts: Thornhill, Markham Village, Buttonville, and Unionville. Within a defined boundary, all properties are protected from inappropriate changes through the use of policies and design guidelines. Designation offers protection against inappropriate alterations and demolition and guides the design of new development. Check the Unionville Heritage Conservation District Map at markham.ca to confirm whether a specific address falls within the district boundary before purchasing.

What Requires a Heritage Permit in Unionville

The guiding principle is that any change visible from a public street within the Unionville Heritage Conservation District requires heritage review. This specifically includes:

• Additions to an existing building that are visible from the street
• Changes to exterior materials, colour, texture, or design — including window replacement, door replacement, cladding changes, and roof material changes
• Demolition of any structure within the heritage district
• New construction on vacant lots within the district
• Changes to heritage trees or significant landscaping visible from the street
• Commercial signage or awning changes on Main Street properties

Interior renovations — kitchen updates, bathroom renovations, basement finishing, flooring — generally do not require heritage permits unless they affect the heritage character of the interior fabric (such as original Victorian woodwork, plaster ceiling medallions, or historic staircases in individually designated Part IV properties).

The Two Types of Heritage Permits

Minor Heritage Permit. For smaller-scale alterations consistent with the Unionville Heritage District Plan guidelines — matching window replacements, repainting in heritage-appropriate colours, minor landscaping changes. Reviewed by Heritage staff with some applications delegated to staff approval. Processing time: typically two to six weeks for straightforward applications.

Major Heritage Permit. For significant alterations, additions, new construction, or demolition. Requires review by the Heritage Markham Committee — the City’s advisory committee on heritage matters, which meets monthly. Processing time: typically eight to sixteen weeks, sometimes longer for complex applications. You must contact the Building Standards Department at 905-475-4870 for the necessary approvals before beginning any alterations.

The Financial Incentives — Heritage Is Not Just Restriction

The City of Markham offers meaningful financial incentives for heritage property owners that partially offset the additional cost and complexity of heritage-compliant renovation:

• Heritage Property Tax Reduction Program: 30% annual reduction on both the municipal and education portions of property tax for eligible designated heritage properties — on an $8,000 annual tax bill, that’s $2,400 per year.
• Heritage Loan Program: Below-market financing for exterior restoration work.
• Commercial Façade Improvement Grant: Up to $15,000 for exterior restoration of historic commercial properties.
• Heritage Markham Committee Façade Improvement Grant: Up to $7,500 for improvements to exteriors of non-historic commercial properties in heritage districts.

The heritage district does not create a frozen-in-time museum. Rather, it serves as a guide for change to achieve a more attractive and compatible community that celebrates its past while acknowledging the needs and desires of current and future inhabitants. Before purchasing any property in the Unionville Heritage Conservation District with planned renovations, obtain the Unionville Heritage Conservation District Plan at markham.ca and review its guidelines for your intended alterations. Michael John Lau, top real estate agent in Markham Ontario, connects heritage property buyers with heritage architects, contractors, and lawyers who specialize in Unionville heritage transactions.