Markham ADU Design Checklist - City Bylaws
Markham, Ontario homeowners and designers planning an Accessory Dwelling Unit (ADU) must meet municipal zoning and building standards while aligning with provincial guidance. This checklist explains the typical design, permitting, and compliance steps for secondary suites and garden suites in Markham, and directs you to the official City and provincial resources for specific rules and forms. Use the practical action steps below to prepare drawings, confirm zoning permissions, apply for permits, and respond to inspections or orders. For provincial context on ADU policy see the Ontario guidance on accessory dwelling units Ontario ADU guidance[3].
Design Checklist
Before applying, verify zoning permissions, setbacks, lot coverage, building height, parking and unit size limits. Prepare drawings and documentation that address the following items.
- Site plan and property survey showing setbacks, lot coverage, and existing structures.
- Floor plans for the ADU with room sizes, egress, stairs, and accessibility considerations.
- Structural details, foundation plan, and load calculations if modifying existing building fabric.
- Estimated construction budget including permit, development, and utility connection fees.
- Project schedule with start and completion dates and inspection milestones.
- Compliance checklist for Ontario Building Code requirements and required inspections.
Penalties & Enforcement
Enforcement of ADU-related non-compliance in Markham is undertaken by the City’s By-law Enforcement and Building Services. Specific fines and penalties are set out in applicable by-laws and enforcement policies; if a fine amount or escalation schedule is not published on the controlling page it will be noted below. For by-law enforcement contact details and complaint submission see the City of Markham By-law Enforcement page City of Markham By-law Enforcement[1].
- Monetary fines: not specified on the cited page.
- Escalation: first, repeat and continuing offence ranges not specified on the cited page.
- Non-monetary sanctions: orders to comply, stop-work orders, demolition or removal orders and court prosecution are possible where by-laws or building code contraventions are found.
- Enforcer: By-law Enforcement and Building Services divisions; inspections are scheduled following a complaint or permit review. See contact and complaint pathways on the City enforcement page By-law Enforcement contact[1].
- Appeals and reviews: appeal routes and time limits depend on the specific order or ticket; time limits are not specified on the cited page.
Applications & Forms
Most ADU projects require a building permit and may require planning or zoning approvals. The City of Markham Building Permits page lists permit requirements, application checklists and submission methods Building Permits[2]. If a specific ADU application form or fee schedule is not published on the permit page, it is noted as not specified.
- Permit name/number: Building Permit for residential alteration or new accessory dwelling - specific form number not specified on the cited page.
- Fees: fee schedule not specified on the cited permit page; consult Building Services for current fees.
- Submission: online application portal or in-person counter as described on the Building Permits page permits and submissions[2].
Action Steps
- Verify zoning for your address with Planning before design work begins.
- Prepare a site plan and drawings that address fire egress and building code requirements.
- Submit a building permit application and pay required fees via the City’s permit portal.
- Schedule inspections and respond promptly to any enforcement notices or orders.
FAQ
- Do I need a permit to build an ADU in Markham?
- Yes. Building permits are required for most ADU constructions or conversions; check the City of Markham Building Permits page for specific submission requirements and checklists.[2]
- Can I rent an ADU long-term?
- Rental rules are subject to zoning, licensing and building compliance; confirm permission and any registration requirements with Planning and By-law Enforcement.[1]
- What happens if I build without a permit?
- Possible outcomes include orders to comply or demolish, fines, and court action as enforced by By-law Enforcement and Building Services; specific fines and escalation details are not specified on the cited pages.[1]
How-To
- Confirm zoning and any special policies affecting ADUs with the City of Markham Planning staff.
- Prepare site plan, floor plans, and technical drawings showing compliance with the Ontario Building Code.
- Complete and submit a Building Permit application via the City’s permit portal and include all supporting documents.[2]
- Pay applicable fees and schedule required inspections as construction proceeds.
- Address any orders or inspection deficiencies promptly to avoid escalation to fines or stop-work orders.
Key Takeaways
- Check zoning and planning before design work.
- Prepare full permit-ready drawings to avoid delays.
- Use City contacts for enforcement, permits, and inspections.
Help and Support / Resources
- City of Markham - By-law Enforcement
- City of Markham - Building Permits
- City of Markham - Building Safety
- Ontario - Accessory Dwelling Units guidance
