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Ontario Zoning By-Laws Explained: What to Know Before You Buy, Renovate, or Invest
The short answer: Zoning by-laws are municipal rules that control how land can be used in Ontario, such as residential, commercial, industrial, or agricultural use, along with building types, lot sizes, heights, parking, and setbacks. If your plans don't comply, you may be able to apply for a minor variance or a zoning amendment.
Zoning can make or break a property plan. Whether you're buying your first home, adding an in-law apartment, taking on a renovation, or investing in real estate, zoning by-laws decide what you can and can't do with the land. Here's what they are, how they can change, and how to check them before you commit.
What are zoning by-laws?
Zoning by-laws set out how land can be used and controlled in your community. They determine:
- How land can be used, for example residential, commercial, industrial, or agricultural
- Where buildings and other structures can be located, for example, whether a commercial building can go in a residential area
- What types of buildings are permitted, such as single-family homes, duplexes, or triplexes
- Lot sizes and dimensions, parking requirements, building heights and densities, and setbacks from the street
Who sets the zoning rules in Ontario?
Municipalities pass zoning by-laws under Ontario's Planning Act. In Durham Region, each local municipality, such as Whitby, Oshawa, or Ajax, has its own zoning by-law, so the rules can differ from one town to the next, sometimes from one street to the next.
How do zoning by-laws affect what you can do with a property?
Zoning decides whether your plans are feasible as they stand or need approval first. That applies to things like:
- Creating an in-law apartment or additional unit
- Building an addition or making extensive renovations
- Adding a garage, deck, or shed
- Running a business from home
- Converting a single-family home into multiple units
Many Ontario municipalities now allow additional residential units, but size, parking, and servicing rules vary, so always check the local by-law.
Can zoning rules change?
Yes. Zoning isn't always fixed. If your plans don't match the by-law, there are two main routes:
| Minor variance | Zoning by-law amendment (rezoning) | |
|---|---|---|
| What is it? | A small exception to a specific rule, such as a setback or lot coverage | A change to the zoning by-law itself, such as a new permitted use |
| Who decides? | Usually a municipal committee of adjustment | Municipal council |
| Best for | Small, reasonable departures that fit the intent of the by-law | Larger changes to how the property can be used |
| Typical effort | Generally quicker and simpler | Generally longer and more involved |
Decisions can often be appealed to the Ontario Land Tribunal. Understanding the process early can save you time and money.
What is a legal non-conforming use?
Sometimes a property is used in a way that's no longer allowed under the current by-law, but was lawful when that use began. Depending on the circumstances, that use may be allowed to continue. It's often called a "legal non-conforming" use. It can be a real advantage, or a real problem if it can't be proven, so it's worth verifying before you buy.
What challenges should you watch for with zoning?
Zoning can be complex, especially in fast-growing areas like Durham Region, the Greater Toronto Area (GTA), and Toronto. Here are key questions to ask about any property:
- Are there structures that aren't on the municipality's building records? Unpermitted additions or renovations can become your problem after you buy.
- Is the property on protected land, such as the Oak Ridges Moraine?
- Is it a designated heritage property or in a heritage district, such as Whitby's downtown core?
- Are there municipal development plans for the surrounding area that could affect the property's value or your day-to-day life?
How do you check a property's zoning before you buy?
- Look up the zoning designation. Check the municipality's zoning map and by-law for the property.
- Ask the municipality. The planning or zoning department can confirm how a property is zoned, and can often provide a zoning verification or compliance letter.
- Have your real estate lawyer search title and coordinate municipal searches. A title search shows registered interests like easements and liens, while zoning and building information typically comes from the municipality.
- Check for special designations. These include conservation areas, protected lands, and heritage registers.
- Ask about future plans. Find out whether any nearby development or planning changes are in the works.
- Build protection into your offer. Your lawyer can advise on conditions that give you time to confirm zoning before you're committed.
This is especially important if you intend to make significant changes, like an addition.
Legal resources
If you have questions, we have answers
Real estate lawyers work with zoning and land use issues every day. McMurter & Associates can help you understand the zoning that applies to your property and guide you on the best course of action, whether you're buying, selling, renovating, or investing in Whitby, Oshawa, Ajax, Pickering, or elsewhere in Durham Region and the GTA. Learn more about our real estate services for buyers and sellers.
If you have questions about your real estate transaction, we're available Monday to Friday, 9am to 5pm. Email info@mcmurter.com or call 905-666-9200.
Disclaimer: This article is meant to inform and educate. It is not legal advice. If you have questions about zoning or your specific property, please speak with a real estate lawyer.
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