Most Ontario landlords know they're required to use the province's Standard Lease form — fewer know exactly what it locks in versus where genuine flexibility still exists. Here's a clear breakdown.
Why the Standard Lease Exists
Ontario requires most private residential tenancies to use the government-mandated Standard Lease form, intended to make lease terms clearer and more consistent for both landlords and tenants, and to reduce disputes over ambiguous or one-sided lease clauses. Using an outdated or non-compliant lease template isn't just a technicality — it can affect your ability to enforce certain terms if a dispute reaches the Landlord and Tenant Board.
What's Mandatory and Can't Be Changed
The core lease structure and required sections — rent amount, services and utilities included, deposit and NSF fee rules, and the tenant's rights around assignment and subletting all follow the mandated format.
Rules that exist regardless of what the lease says. Some Residential Tenancies Act protections apply whether or not a landlord includes them in the lease — a landlord cannot contract out of a tenant's fundamental RTA rights simply by omitting or altering a clause.
Standard notice requirements. Termination and notice period rules follow provincial requirements regardless of what a landlord might prefer to specify.
Where Landlords Actually Have Flexibility
Additional terms in Schedule A. The Standard Lease includes space for landlords to add their own additional terms — provided those terms don't conflict with the RTA or attempt to waive a tenant's legal rights. This is where most of a landlord's actual customization happens: pet policies (within legal limits), specific maintenance responsibilities, parking arrangements, and building-specific rules.
Rent amount and initial terms. For a new tenancy, landlords have full flexibility to set the opening rent at whatever the market supports — the rent increase guideline only restricts increases on an existing tenancy, not what you charge a new tenant.
Parking and additional services. Whether parking, storage, or other add-ons are included in rent or charged separately is generally the landlord's call, provided it's clearly documented in the lease.
Common Mistakes Landlords Make With the Standard Lease
Using an outdated version of the form. The Standard Lease has been updated over time — using an old template can create ambiguity about which rules actually apply.
Adding terms that conflict with the RTA. Any additional term that attempts to waive a tenant's fundamental rights — for example, a blanket "no guests" clause — is generally unenforceable regardless of whether the tenant signed it.
Leaving Schedule A blank when specific building or property rules genuinely need documenting. Verbal agreements about parking, storage, or maintenance responsibilities are far harder to enforce than terms actually written into the lease.
Not providing the lease at all, or providing it late. Landlords are generally required to provide a copy of the signed lease to the tenant within a set timeframe — failing to do so can affect a landlord's ability to enforce certain terms later.
What This Means for New Landlords Specifically
If you're leasing out a property for the first time — including a newly converted secondary suite — getting the Standard Lease right from day one avoids the far more common and costly mistake of trying to retroactively add terms partway through a tenancy, which is generally far harder to enforce than getting it right at signing.
The Bottom Line
The Ontario Standard Lease gives landlords less room to customize core terms than many expect, but genuine flexibility exists in the additional terms section — provided those terms respect the RTA's baseline protections. Getting this right at signing avoids disputes that are far more expensive to resolve later.
Want help making sure your lease and additional terms are properly documented and enforceable? Contact our team — we help GTA landlords get this right from the start.
This article summarizes general Residential Tenancies Act principles and is not legal advice. Consult a paralegal or lawyer for guidance specific to your situation.
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