Commercial tenancies in Canada fall under provincial jurisdiction, and the governing statute (or absence of one) varies considerably across the common-law provinces. In Ontario, the relevant law is the Commercial Tenancies Act, R.S.O. 1990, c. L.7, which sets default rules on remedies for non-payment, overholding and termination. In British Columbia, the Commercial Tenancy Act, R.S.B.C. 1996, c. 57 performs a similar function. Alberta, notably, has no dedicated commercial tenancy statute, so commercial leases there rest on common-law principles of contract and property, shaped by leading cases such as Highway Properties Ltd. v. Kelly, Douglas & Co. Ltd. on landlord remedies for abandonment. Several other provinces also operate on common law alone, which is precisely why a thoroughly drafted written lease matters so much.
The defining feature of this area is that the signed lease almost always takes precedence over the statutory defaults. Provincial commercial tenancy legislation acts as a backstop that fills gaps when the contract is silent, not as a ceiling on what parties can agree. The Ontario statute, for example, does not regulate rent increases, does not require interest on a security deposit, and grants landlords powerful self-help remedies: a landlord can change the locks on the 16th day after rent falls due, or distrain by seizing and selling the tenant's goods on the premises, but never both. Overholding carries real teeth too, with section 58 of the Ontario Act exposing a tenant who wilfully holds over to double the agreed rent. Because almost none of this protects the tenant the way residential law would, the clauses you negotiate carry the full weight of the relationship. The Government of Ontario's official guidance on renting commercial property in Ontario sets out these landlord remedies and the dispute routes through Small Claims Court and the Superior Court of Justice. One further point that catches new tenants off guard: commercial rent is a taxable supply, so GST or HST applies to base rent and to most additional rent, including common-area charges and recovered property taxes. Confirm the tax treatment before you sign, because it changes the real cost of the space.