A lawful, quiet home business isn't grounds for eviction in Ontario. An illegal one, or one that breaks zoning and disturbs the building, is.
Short answer
It depends entirely on whether the business is illegal, not on whether it exists. Under section 61 of the RTA, a landlord can only pursue eviction where a tenant "carries on an illegal trade, business or occupation" — a lawful home business, like freelance work or an online shop with no client traffic, isn't on its own a basis for termination, even if the lease says "residential use only."
Interpretation Guideline 9 is explicit that "the term 'illegal' is not defined in the RTA but would include a serious violation of a federal, provincial or municipal law," and that trivial or technical violations typically don't justify eviction on their own. The guideline gives a real example of what does qualify: a tenant who "listed her rental unit with a real estate agent and repeatedly sublet the unit to short-term occupants for a rent that greatly exceeded the lawful rent" was found to be running an illegal business under section 134 of the Act — not because subletting itself is illegal, but because the rent charged broke the Act's rent rules.
Where illegality is established, notice periods split by seriousness: 10 days for drug production, trafficking or possession for trafficking, and 20 days for other illegal acts or businesses under section 61(2)(b). Even then, an adjudicator has to weigh whether eviction would be unfair under section 83(1)(a) — factors like tenancy length, the tenant's financial situation, whether children are involved, any history of problems, and the likelihood the conduct continues. The Board can also impose a condition instead of terminating — ordering the business to stop rather than ending the tenancy — for example where the activity breaches a municipal zoning by-law rather than being independently illegal.
Zoning is its own trigger even without a criminal or Act-level violation: a home business that a municipal by-law prohibits in a residential zone can lead the Board to order the tenant to stop the business specifically, short of eviction. This is the same short-term-rental pattern that shows up in how unauthorized short-term rentals get treated — running an unauthorized business out of a residential unit, rent-related or not, tends to land in the same illegal-business analysis regardless of what the business actually is. And it sits alongside the same lesson about clauses that overreach what the RTA actually permits: a lease clause banning "any business use" outright doesn't automatically win on its own if the activity in question is perfectly legal.
A 30-minute call is enough to tell you whether AI pays for itself here.
