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Ontario Condo Laws: The Rules Beyond the Condominium Act

A plain map of Ontario condo laws: how the Condominium Act, declaration, by-laws and rules fit together, and which one governs common condo problems.

Real Estate5 min readTSLBy the Treadstone Law Team · OntarioUpdated October 28, 2026
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Key takeaways
  • The declaration must be consistent with the Condo Act, and rules must be reasonable.
  • Different documents are changed by different votes: 90% to change unit proportions, 80% for most other declaration changes, and a majority of voting units participating for rules.
  • A declaration amendment is not effective until the amended declaration is registered at the Land Registry Office.
  • The Condominium Authority Tribunal handles only some disputes, so knowing which rule applies helps you pick the right route.

When people search for condo laws, they usually want to know one thing: what rule actually decides my problem. In Ontario the answer is rarely just the Condominium Act. A building is run under layers of rules, and each layer has its own purpose and its own way of being changed.

This article gives you a simple map. It explains how the Act, the declaration, by-laws and rules fit together, shows examples of which one tends to matter, and suggests how to find the right document for your issue. For anything that affects your money or your home, a lawyer can confirm how it applies.

The layers of condo rules

Think of condo governance as a stack. At the top is the Condominium Act and its regulations, which apply to every condo corporation. Below that is your corporation's declaration, which sets out key features of your building. Then come by-laws, which govern how the corporation operates, and rules, which govern day-to-day use of the property.

The layers must fit together. Declarations must be consistent with the Condo Act, and rules must be reasonable.

LayerWhat it generally doesHow it changes
Condo Act and regulationsSets rules for all Ontario condosChanged by legislation, not by owners
DeclarationStates each unit's proportion of common expenses and other core terms80% of owners for most amendments, 90% to change expense proportions, then registration
By-lawsGoverns how the corporation runsCheck your by-laws for the process
RulesGoverns use of units and common areas; must be reasonableMajority of voting units participating in a meeting

The declaration and why it is hard to change

The Condo Act requires the declaration to state the proportions of common expenses allocated to each unit. That percentage is what turns the annual budget into your monthly fee. Because it affects every owner's wallet, changing the proportions needs the consent of 90% of owners, while most other declaration amendments need 80%.

An amendment is voted on at an owners' meeting called by the board, with notice that includes the proposed amendment. It is not effective until the amended declaration is registered at the Land Registry Office. If someone tells you the declaration has changed, ask whether it has been registered.

Rules and by-laws: easier to change, but limited

Rules deal with things like how common areas are used. They can be changed by a majority of voting units participating in a meeting, which is far lower than the thresholds for the declaration. The trade-off is that a rule must be reasonable.

Your building's declaration, by-laws and rules all come with a status certificate, along with the budget, financial statements, reserve fund study and insurance certificates. That makes a status certificate a handy way to see all your governing documents in one place.

Which layer governs which problem

For the lien, the corporation must give written notice at least 10 days before registering a Certificate of Lien, and must register it within three months of the default or the lien expires. These timelines are summarized from guidance, so confirm them against the Act with a lawyer if a lien affects you.

Where disputes go

Not every disagreement belongs at the Condominium Authority Tribunal. It cannot hear financial or budget disputes, repair and maintenance disputes, or changes to the common elements. A chargeback can be disputed there only if the underlying issue is already within its jurisdiction, such as parking, while chargebacks for repairs and damage go to mediation, arbitration or the Superior Court.

If a corporation charges for repairs, you do not pay and a lien follows, the owner must dispute the lien in court.

What to do next

Frequently asked questions

Which is stronger, the declaration or the rules?

The declaration must be consistent with the Condo Act, and rules must be reasonable. Declaration changes also need far higher owner support than rule changes.

How many owners must agree to change the declaration?

Changing the proportions of common expenses needs 90% of owners, and most other amendments need 80%. The amendment is not effective until the amended declaration is registered at the Land Registry Office.

Can the board charge me extra without a vote?

For large budget shortfalls, the board can assess a one-time special assessment through common expense fees without owner permission, using the same percentage as common expenses. Whether a particular charge was proper depends on the facts.

Where do I find all the documents that govern my condo?

A status certificate comes with the declaration, by-laws and rules, the budget, financial statements, reserve fund study and insurance certificates. The corporation may charge no more than $100 for it and must provide it within 10 days.

Sources

Links go to official government, court and regulator pages. The law changes — confirm you are reading the current version.

This article is general information, not legal advice. Reading it does not create a lawyer-client relationship. Ontario laws, tax rates, and government programs change, and how the law applies depends on your specific facts. For advice about your situation, speak with a licensed Ontario lawyer. Treadstone Law is licensed by the Law Society of Ontario — reach us at 1-844-900-1070 or start a file online.

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