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Ontario Condo Laws: The Condominium Act Explained Simply

A plain overview of the Condominium Act, 1998 in Ontario, plus the declaration, by-laws and rules, and which one governs your condo problem.

Real Estate5 min readTSLBy the Treadstone Law Team · OntarioUpdated November 1, 2026
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Key takeaways
  • Ontario condos are governed in this order: the Condo Act, then the declaration, then the by-laws, then the rules.
  • If the documents conflict, the Act takes priority.
  • Changing each document has a different process, from board-made rules to declaration amendments needing 80 to 90 per cent owner consent.

Living in a condo means living under several layers of rules. New owners are often unsure whether a problem is covered by the law, the declaration, the by-laws or the rules.

This article gives a plain overview of how those layers fit together in Ontario, how each is changed, and a few examples of what the Condominium Act, 1998 covers.

The four layers

Ontario condos are governed in this order: the Condo Act, then the declaration, then the by-laws, then the rules. If they conflict, the Act takes priority.

How each one is changed

DocumentHow it changes
DeclarationWritten consent from 80 to 90 per cent of owners, depending on the change
By-lawsPassed by the board, then voted on at an owners' meeting, where most changes need majority approval; approved by-laws are registered in the Land Registry Office
RulesThe board can make or change them after notifying owners; a rule takes effect unless owners request a meeting to challenge it before its effective date

What the Act covers in practice

The Act sets many rules that apply no matter what your declaration says. Some examples:

Reserve funds are a good example. Owners pay into the fund through their monthly common expense fees, and the board decides how much goes to it. A new corporation must complete a Class 1 reserve fund study within the first year after the declaration and description are registered. After that, updated studies are required at least every three years, alternating between Class 2 and Class 3. The board must review each study within 120 days of receiving it and propose a plan for future funding.

Special assessments also come from the Act. A condo board can levy a special assessment through common expense fees without owner approval, for reasons such as unforeseen expenses, a major repair that exceeds its budget or litigation costs. Your share uses the same percentage as your common expense share, and owners must pay it. An unpaid special assessment gives the corporation a lien against the unit, covering the unpaid amount, interest and reasonable legal costs and expenses. There is an exception: in a court decision the Condominium Authority of Ontario describes, a buyer was exempt from their share because the status certificate had not clearly disclosed that assessments might be levied.

Liens have their own steps. A lien for unpaid fees expires three months after the default unless the corporation registers a Certificate of Lien in the Land Registry Office, and if it expires the corporation loses its priority over other parties with an interest in the unit. Before registering, the corporation gives the owner a Notice of Lien, and if the arrears are not paid within 10 days it can register the certificate. An owner can pay everything secured by the lien at any point until the unit is sold, and the corporation must then discharge it.

For new condos, a purchase agreement with a builder is not binding until the buyer has received both the disclosure statement and Ontario's Residential Condominium Buyers' Guide. A buyer may also rescind after a material change in the information in the disclosure statement, which is a separate right from the initial cooling-off period.

Other matters, such as the definition of a standard unit, deductible by-laws and owner insurance requirements, differ from one corporation to the next depending on its declaration and by-laws.

Which one governs your problem

Start with the Act, since if the documents conflict, the Act takes priority. Then check the declaration, by-laws and rules in that order. Some examples:

Some changes to condo law have been announced but are not yet in force, so check what applies today before relying on a summary.

What to do next

Frequently asked questions

Which wins if the by-laws and the Act disagree?

The Act takes priority if the governing documents conflict.

Can the board change the rules on its own?

The board can make or change rules after notifying owners. A rule takes effect unless owners request a meeting to challenge it before its effective date.

How hard is it to amend the declaration?

It needs written consent from 80 to 90 per cent of owners, depending on the change.

Do I have to carry my own condo insurance?

It depends on your building. No statute is cited as requiring owners to carry their own insurance, but the Condominium Authority of Ontario says owners should strongly consider property insurance for upgrades, fixtures, furnishings, equipment and personal property, and possibly legal expense insurance. Your declaration, by-laws or rules may require it, and then it is mandatory for that building, so check your own documents.

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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