What records explain additional residential units at a Newmarket home?

By-law 2026-10, enacted on 30 March 2026, amends the Town's three zoning by-laws: beside the primary residential unit, a lot may have at most two additional residential units, either two inside the house or one inside and one in a detached building, on a lot with a single-detached, semi-detached, link or townhouse dwelling. Each additional unit needs one parking space beyond the two for the main home, and the by-law sets its own rules for a detached unit's size, height and distance from the street.

Since 2013, under By-law 2013-13, every home with an additional unit must be registered with the Town, for a one-time fee of $268.93; a registered home gets an "N" plate and a "B" address for the unit, and the Town publishes a list and map of registered units. A general permission does not make an existing basement apartment lawful; registration, the building permit and inspections are the records that do.

• Additional Residential Unit: the Town's page on zoning, registration, the fee and the list of registered units
• By-law 2026-10: the zoning amendment for additional residential units (PDF)

Extra units allowed is in the free check as a summary of the Town's rule, from our hand-kept table of city rules, and the full report reads the lot's zone where the Town's zoning map is open data we can use; where it isn't, the report's line says where the Town 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