BuildRules/Newmarket/Basement apartment / secondary suite/Checklist

Newmarket, Ontario / Project checklist

Newmarket basement apartment / secondary suite permit checklist

Use a project-specific basement apartment / secondary suite permit checklist for Newmarket, Ontario: documents, next steps, source review date and official references.

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Focused project answerLast verified Oct 2, 2026
Use this before you submit

5 items to prepare for this project.

This page is the submission checklist. For permit thresholds, size rules, zoning and the full project decision, use the main guide.

Open the main Newmarket basement apartment / secondary suite rules

Project template

Your preparation checklist

Use it as a working list. The final submission still needs to match your actual scope and the City’s current requirements.

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Preparation checklist · Reviewed 2026-10-02

What to do next

  1. Confirm zoning eligibility
  2. Plan the unit and parking
  3. Obtain the required building permit
  4. Complete inspections
  5. Register the ARU with the Town

Official sources behind this page

ARU zoningConfirm the unit is allowed first

Newmarket tells owners to confirm that an ARU is allowed in the property’s zone before building.

Official sourceTown of NewmarketAdditional Residential Unit · ARU zoning, building permits, inspections and registration
Verified2026-10-02Open proof
Building permitRequired for a new ARU

New ARUs must go through the appropriate building-permit process and inspections.

Official sourceTown of NewmarketAdditional Residential Unit · ARU zoning, building permits, inspections and registration
Verified2026-10-02Open proof
RegistrationRequired after the applicable approvals

Newmarket requires residences with ARUs to be registered with the Town.

Official sourceTown of NewmarketAdditional Residential Unit · ARU zoning, building permits, inspections and registration
Verified2026-10-02Open proof

Need the full project answer?

The main guide keeps the permit trigger, zoning questions, documents, fees, timing and next steps together.

Open the basement apartment / secondary suite guide