OHI | Can My Tenant? · Ontario rental question #21
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Last verified: September 15, 2026
Quick answer: Generally, not without the landlord’s consent. Ontario’s Residential Tenancies Act (RTA) says a tenant must not alter the locking system on a door giving entry to the rental unit or residential complex unless the landlord agrees. A landlord also cannot change the locks without giving the tenant replacement keys.
Section 35 of the RTA addresses lock changes by tenants. Section 24 addresses lock changes by landlords. These reciprocal rules protect security while preserving lawful access.
A tenant’s safety concern does not erase the statutory rule, but urgent circumstances should be handled promptly. Where domestic or sexual violence is involved, specialized legal and safety resources may be appropriate.
What if the tenant replaces a lock after losing a key?
The tenant should contact the landlord rather than unilaterally changing the system. The parties can agree on replacement, costs and delivery of keys. If an immediate security measure is necessary, document the circumstances and communicate as soon as safely possible.
Can the landlord force entry because the key no longer works?
No. A lock dispute does not create a general right to break in. Entry must still comply with the RTA, except in a genuine emergency. The landlord should document the issue and use the appropriate LTB process if it cannot be resolved.
What if the lock is broken?
A broken or unsafe lock can be a maintenance issue. The tenant should report it promptly, and the landlord should arrange repair while respecting lawful entry requirements.
What should the tenant do?
- Request written consent before changing or rekeying an entry lock.
- Explain any security concern and propose how replacement keys will be provided.
- Report broken locks immediately and keep messages and photographs.
- Seek prompt legal and safety advice if the situation involves violence, stalking or an immediate threat.
What should the landlord do?
- Respond promptly to security and maintenance concerns.
- Put any permission, cost arrangement and key-transfer plan in writing.
- Do not remove or lock out the tenant; only the lawful eviction process can end possession.
- Use the correct LTB process for an unresolved unauthorized alteration.
Example
A tenant installs a new deadbolt without telling the landlord and keeps the only key. That can breach section 35. If the existing lock failed, the repair obligation and emergency facts also need to be considered.
Related OHI guides and tools
Official sources
- Ontario Residential Tenancies Act, 2006
- Landlord and Tenant Board: Renting in Ontario
- Current LTB forms, instructions and filing information
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General information only: This article discusses Ontario residential tenancies and is not legal advice. Some rentals are exempt from all or part of the RTA. Outcomes depend on the facts and evidence. Rules and forms can change; verify current information with Tribunals Ontario or obtain advice from a licensed Ontario legal professional.