Heritage and Historic Home Renovations in Toronto

In Toronto, a “heritage home” can mean a few different things, and it is worth clarifying them at the outset. Some homes are officially designated under the Ontario Heritage Act, which means they have legal protection due to their architectural, historical, or cultural significance. Others are listed, recognised on the City’s heritage register, but with a more limited level of control. In addition, many properties sit within Heritage Conservation Districts, where the character of the area as a whole is protected, not just individual buildings.

Beyond the formal definitions, Toronto also has a vast stock of century homes that may not carry any official designation but still behave like heritage properties from a construction standpoint. They often have original masonry, hand-built framing, traditional plaster, and historic millwork. These homes require the same level of respect, investigative work, and craftsmanship as formally designated properties.

You absolutely can renovate a heritage home in Toronto. In fact, heritage renovation is often encouraged when it extends the life of the building and enhances its usability.

Most restrictions are focused on elements that are visible to the public realm, such as façades, rooflines, window patterns, and, in some cases, prominent interior spaces. Within those parameters, there is considerable room to upgrade structural systems, improve performance, reconfigure interiors, and even add space.

In many cases, yes. Additions are possible on heritage homes and in conservation districts, provided they are thoughtfully designed and sensitive to the existing structure and streetscape. Heritage authorities generally look for additions that:

• Respect the scale and massing of the original home

• Use materials and proportions that complement, rather than mimic, the historic fabric

• Are often visually subordinate to the original structure

The process usually involves more design work up front and a more detailed submission package. However, a well-conceived addition can significantly improve function, adding a family room, kitchen expansion, principal suite, or mudroom, while still maintaining the architectural integrity of the original house.

Yes. Replicating and extending original details is one of the most satisfying aspects of heritage work and an area where our team excels. Working with local millwork shops, carpenters, and plaster artisans, we can:

• Match historic trim and casing profiles

• Recreate panelled walls, wainscoting, and built-ins

• Restore or replicate plaster mouldings and ceiling details

• Integrate new elements that align with the home’s architectural language

This process often begins with carefully removing a representative piece, documenting its dimensions, and creating templates or custom knives to reproduce the profile. Achieving a consistent finish then requires a coordinated approach to staining, painting, or plastering across both existing and new surfaces.

Heritage home renovation costs in Toronto vary widely, but they are generally higher than comparable work on newer homes because of the investigative work, structural upgrades, and detailed craftsmanship required. There are several reasons for this:

• Investigative work and exploratory demolition are often needed up front to fully understand the structure and condition of the home.

• Structural upgrades, foundation work, and framing corrections are more common.

• Custom reproduction of millwork, windows, and plaster details requires specialised trades and more time.

• Careful demolition and protection are essential to avoid damaging historic fabric, which slows the pace of work.

• The approvals process and detailed documentation add design and consulting costs.

For more detail on typical investment ranges, you can review our Toronto home renovation cost guide, which includes examples specific to heritage and century homes.

Common surprises include concealed structural deficiencies, outdated or unsafe wiring, undersized plumbing, hidden water damage, and previous renovation work that does not meet current code or quality expectations. Occasionally, heritage officers may also request adjustments to proposed work once they see conditions opened up.

We manage this risk through a combination of thorough pre-construction planning, phased exploratory work, and transparent communication. Early selective demolition in key areas helps us uncover likely issues before final pricing and scheduling are locked in. When surprises do arise, we present options clearly, with cost and schedule implications, so clients can make informed decisions without feeling rushed.

Our long-standing relationships with engineers, trades, and suppliers also help us respond efficiently. We understand that we can't eliminate the challenge of the unknown, that’s impossible in heritage work, but we do handle each discovery methodically, without compromising the quality or integrity of the renovation.

This approach gives heritage homeowners realistic expectations about contingency and helps keep complex renovations moving forward without sacrificing safety or quality.