Source-reviewed city index
Common residential permit questions for Newmarket, organized by project. Open any row to see the conditions, official evidence and property-specific limitations behind the answer.
Latest represented review
Oct 2, 2026
A permit answer can still depend on dimensions, use, plumbing, structural work, zoning or the exact property. BuildRules keeps those conditions visible instead of reducing the rule to a false green-or-red score.
Do you need a permit for an additional residential unit in Newmarket?
Yes. A new ARU needs the correct building permits and inspections, and Newmarket also requires ARU registration.
1 official source
Do you need a permit to finish a basement in Newmarket?
Yes. Newmarket lists finishing a basement as work that requires a building permit.
1 official source
Do you need a permit for a deck in Newmarket?
A permit is required if the deck is attached to the home, greater than 10 m² or 600 mm above grade.
1 official source
Do you need a permit for a shed in Newmarket?
A detached structure greater than 15 m² requires a building permit. Standalone structures at or below 15 m² without plumbing are typically permit-exempt.
1 official source