Free ARU tools for Ontario homeowners
Two quick ARU tools built on official municipal data: one tells you what your lot may allow, the other shows whether the numbers work.
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What can I build?
Five questions, one answer: how many units your lot may allow, which types fit and what incentives apply in your town.
Open the ARU lot checker 02ARU calculator
Slide in your cost and rent to see payback, and whether a rent-capped forgivable loan beats renting at market.
Open the ARU rent and grant calculatorBoth tools draw on our ARU rules by city comparison. For help turning the result into a plan, see our secondary unit services or book a free property check.
Find out what your property can hold
Send us your address and what you have in mind. We will check the zoning, flag any servicing issues and tell you which incentives you may qualify for, at no cost.