Buying a Heritage Home in Eastern Ontario: What Designation Actually Controls

Three different things people mean by "heritage"

In a listing, "heritage home" can mean anything from a genuinely protected property to an old house with nice trim. Under the Ontario Heritage Act there are three separate situations, and they carry very different obligations.

• Listed on the municipal register. Council can add a property it believes has cultural heritage value to its register without designating it. Listing does not require a permit for renovations. The main rule is that the owner cannot demolish or remove a building on the property without giving council at least 60 days' written notice. That window gives council time to decide whether to designate.
• Individually designated (Part IV). Council passes a by-law designating the property. The by-law describes its cultural heritage value and its heritage attributes, and it is registered against the property in the land registry office. Alterations likely to affect those attributes, and demolition, need the municipality's consent in writing.
• In a heritage conservation district (Part V). A whole area is designated by by-law, with a district plan. Inside the district, you need a permit to alter any part of the property other than the interior of a building, to erect a new building or structure, or to demolish or remove attributes the plan protects.

The difference between listed and designated is the one that surprises people most. A listed house is on the city's radar. A designated house has a registered by-law that tells you exactly what the city expects to be kept.

The three side by side

What that means for ordinary projects

For a designated property, the key document is the designation by-law, because the consent requirement follows the heritage attributes it describes. Some by-laws focus on the street-facing exterior. Others also describe interior features. You cannot tell which from the listing photos.

In practice, the projects that tend to need approval are the ones buyers of older homes often have in mind. The City of Ottawa says alterations requiring its approval include, but are not limited to, additions, window replacement, partial demolition, and porch replacement or restoration. Its posted fee for a staff-level alteration permit was $309 when I checked in September 2026, with some restoration and maintenance work exempt from fees.

Timing matters too. Once the municipality confirms your application is complete, the Act gives council 90 days to decide on a designated-property alteration unless a longer period is agreed, and a failure to notify you within that time counts as consent. A heritage approval is also not a building permit. If the work needs one, you still need it.

If you are buying in Ottawa, the city says it has over 300 individually designated buildings and 20 heritage conservation districts. In Brockville, the city maps its municipal register, with designated properties and listed properties marked separately. Parts of the downtown and lower waterfront are worth checking before you plan renovations, which I also touched on in the Brockville waterfront living guide.

How to check a property before you firm up

• Search the municipal heritage register. The Act requires municipalities to make it available on their website.
• Ask your lawyer to look for a designation by-law or district by-law registered on title, and get a copy of the by-law or district plan.
• Ask the sellers what exterior work has been done, and whether heritage approval was obtained for it.
• Line up the professionals early. An older home deserves a thorough inspection, and the home inspection guide covers what to ask for. Insurance is worth checking before you are committed too, as I explained in insuring an older home in Eastern Ontario.
• If you are planning an addition, new windows or a porch rebuild, call the municipality's heritage planning staff before you firm up and ask what they would expect.
• Give yourself the room to do all of this with the right conditions in your offer.

Listed properties and the January 1, 2027 date

There is a timing issue worth knowing about for listed homes. Under changes made in 2022, a property that was on a register without being designated as of December 31, 2022 must be removed from the register unless council gives notice of its intention to designate it on or before January 1, 2027, or a later date if one is prescribed. Properties listed on or after January 1, 2023 come off after two years unless council gives that notice.

Once a property is removed under those rules, council cannot list it again for five years. The practical point for a buyer: if the house you like is listed but not designated, ask the municipality whether designation is being considered. The answer can change what you are buying.

Is a heritage home a bad idea?

Not at all. Plenty of people buy these homes precisely for the stone, the trim and the street they sit on, and they are happy to keep them that way. The question is fit. If your plan is to maintain the house and update the kitchen, heritage status may barely touch you. If your plan involves an addition, new windows across the front or a teardown, it matters a lot, and you want to know that before your conditions expire, not after.