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Extra space in your backyard might soon become extra income.

Ottawa is working out the rules around coach houses — small, detached apartments on existing lots, such as a dwelling unit in a backyard or a little apartment above a detached garage. There are a lot of unknowns, but one thing is certain: they’re coming.

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“It’s a provincial requirement. It’s not a matter of if we do it, but when,” says planner Emily Davies.

Here’s a primer:

Q Why is the city considering coach houses?

A It’s required under Ontario’s 2011 Strong Communities Through Affordable Housing Act. The city’s official plan and zoning bylaws already allow for secondary dwelling units in detached houses, duplexes and townhouses. Coach houses are something different — an apartment outside an existing residence.

Q How are they different from garden suites?

A Commonly called “granny flats,” garden suites are temporary units, often a trailer, permitted for a limited time. A coach house has a foundation — it’s permanent.