There is no legal limit on how much commercial rent can increase in Ontario. The Commercial Tenancies Act does not regulate rent increases, and the Residential Tenancies Act does not apply to commercial tenancies, so your lease is the only document that controls how much your landlord can charge and when the amount can change.1Government of Ontario. Commercial Tenancies Act, RSO 1990, c L.7 Without a written lease, a landlord can raise rent by any amount at any time.2Government of Ontario. Renting Commercial Property in Ontario
Why There Is No Cap on Commercial Rent
Residential tenants in Ontario have an annual guideline set under the Residential Tenancies Act. The 2026 guideline caps most residential increases at 2.1%.3Government of Ontario. Residential Rent Increases Commercial tenants get none of that. The statute governing your tenancy is silent on rent increases, which means the landlord is free to propose whatever the market will bear when your fixed term ends.
In practice that translates into three scenarios. During a fixed-term lease, the rent is locked at whatever the lease states, and the landlord cannot raise it mid-term unless the lease itself provides for an increase. At renewal, the landlord can propose any figure: a modest bump, a large jump, or a full reset to current market rates. And where there is no written lease at all, the landlord can raise rent by any amount at any time.2Government of Ontario. Renting Commercial Property in Ontario Operating on a handshake agreement is the fastest way to lose control of occupancy costs.
What Your Lease Should Say About Increases
Because the law imposes no ceiling, the lease is the only source of rent-increase rules. A commercial tenancy agreement should specify the amount of rent charged and the frequency of rent increases.2Government of Ontario. Renting Commercial Property in Ontario The mechanism your lease uses tells you exactly how much your rent can rise over the term.
Fixed Increases
The simplest approach sets a predetermined dollar amount or percentage at set intervals. A lease might raise rent 3% each year, or add a flat $500 per month every two years. Fixed increases are predictable and easy to budget.
CPI-Linked Increases
Some leases tie annual adjustments to the Consumer Price Index so rent tracks inflation. A CPI clause without a cap can spike unexpectedly if inflation surges, which is why negotiating a ceiling on the annual percentage matters. Ontario landlords sometimes set annual increases at 2% to 3% as a baseline.
Market Rent Reviews
At renewal, or at intervals during a long lease, a market rent review resets the base rent to reflect rates for comparable space. The clause should define the appraisal process, the appraiser’s qualifications, and a fallback if the parties cannot agree. “Comparable space” is inherently subjective, and disputes here are common.
Operating Cost Pass-Throughs
In net leases the tenant pays a proportionate share of the building’s operating costs on top of base rent. The three standard categories are property taxes, building insurance, and common area maintenance. A triple net lease passes all three to the tenant, so your total occupancy cost rises whenever any of those expenses go up, even if base rent stays flat. Management fees, typically 4% to 6% of controllable expenses, are often included as a common area maintenance line item.
This is where tenants get surprised most often. A landlord might hold base rent steady while property taxes climb 15% in a reassessment year, and the tenant absorbs that increase dollar for dollar. Review which expense categories are included, whether there is a cap on annual operating cost increases, and whether the lease requires an annual reconciliation statement.
Percentage Rent
Retail tenants sometimes pay a percentage of gross sales on top of base rent once revenue passes a threshold called the breakpoint. The natural breakpoint is often the annual base rent divided by the agreed percentage. If base rent is $60,000 and the percentage is 6%, the breakpoint is $1,000,000 in sales, and anything above triggers the additional rent. Rates of 5% to 10% on overage sales are common, depending on the industry.
The Renewal Trap: 200% Rent for Holdovers
The biggest financial exposure in commercial tenancy law hits at the end of a fixed term. If your lease expires and you stay in the space without a new agreement, section 58 of the Commercial Tenancies Act treats you as a holdover tenant liable for rent at 200% of the rate set out in the expired lease.1Government of Ontario. Commercial Tenancies Act, RSO 1990, c L.7 The double-rent penalty applies automatically and continues until a new agreement is signed or you vacate.
The other terms of the expired lease typically continue during the holdover period, except for the rental amount and any renewal or extension rights. If the lease says nothing about holdover, common law may treat the resulting arrangement as an annual tenancy, which would require a full year’s notice to terminate. A landlord who accepts rent from a holdover tenant is generally deemed to have consented to continued occupancy, but that consent does not prevent the landlord from demanding the statutory double rent.
Start renewal talks well before your lease expires. Waiting until the last month leaves you almost no leverage and puts you at risk of paying twice the previous rate.
Does the Landlord Have to Give Notice
The Commercial Tenancies Act does not require a landlord to give any specific notice before raising rent.2Government of Ontario. Renting Commercial Property in Ontario Any notice obligation has to come from the lease itself. If your lease has no notice clause, the landlord owes you no statutory warning before proposing a higher rent at renewal.
For month-to-month commercial tenancies, section 28 requires one month’s written notice from either party to end the tenancy.1Government of Ontario. Commercial Tenancies Act, RSO 1990, c L.7 That termination right acts as a built-in check on both sides: the landlord can end the arrangement with one month’s notice and offer new terms at a higher rate, and the tenant can walk on the same timeline if the number is unacceptable.
Negotiating a Ceiling on Increases
With no statutory ceiling to fall back on, negotiation is the tool that actually controls what you pay over time. A few approaches tend to work.
Lock in the escalation terms during the original lease rather than at renewal. Once you are in the space with fixtures installed and customers trained to find you, your bargaining position weakens sharply. A renewal option with a pre-agreed escalation formula is far more valuable than an open-ended renewal at “market rent to be determined.”
Push for caps on pass-through costs. Even in a triple net lease you can negotiate annual caps on operating cost escalation, exclusions for capital expenditures that add to the building’s value rather than its day-to-day operation, and audit rights that let you verify the landlord’s expense figures.
Use lease length as leverage. Landlords carry real costs when a space sits vacant, so a longer commitment can be traded for lower annual escalation or a rent-free fixturing period at the start of each renewal term.
Understand the local market before you negotiate. Vacancy rates, comparable rents per square foot, and the landlord’s own occupancy level all shape what increase is realistic. A tenant proposing a 2% annual cap in a market with visible empty space has a very different conversation than one asking for the same cap in a fully leased building.