What records explain additional dwelling units at a Greater Sudbury home?

The City's guide says a maximum of four dwelling units can be created on a lot under By-law 2010-100Z, on fully serviced parcels only; on lands not fully serviced by municipal water and sewer, up to three units are permitted. In Rural and Agricultural zones up to two additional units are permitted, one in or attached to the main building and the other within 30 metres of it. The guide lists parking, height, lot coverage and yard rules for units in accessory buildings, and says additional units are not permitted in a dwelling in an Environmental Protection zone, on a lot with a garden suite, or in the Rural Shoreline zone.

Every additional unit must be registered under By-law 2017-14, and a unit created after 12 July 2016 needs a building permit and an occupancy inspection. For an older unit the guide names two routes, legal non-conforming status granted by the Chief Building Official or a building permit to legalise it, so a permission in the zone does not make an existing basement apartment lawful. The City's as-of-right page says the same amendments allow up to four units per lot in many urban areas.

• Four Units as of Right: guide for homeowners: the City's guide: unit counts, servicing, where units are not permitted, registration
• As-of-right zoning: the City's page on up to four units per lot

Extra units allowed is in the free check as a summary of the City's rule, from our hand-kept table of city rules, and the full report reads the lot's zone where the City's zoning map is open data we can use; where it isn't, the report's line says where the City publishes it. Neither is confirmation that a particular unit holds a permit or may be occupied.

Free check: pick “Extra units allowed” See the sample report