How Long Does a Building Permit Take in Ontario?

What does the 10-business-day rule actually mean?

Ontario’s Building Code sets permit decision periods by building category. The commonly cited 10-business-day period applies to specified house categories. Other categories have 15-, 20- or 30-business-day periods. Do not select a deadline based only on the project’s everyday name—ask the building department which class applies.

These periods concern issuing or refusing a permit on a complete application. They do not promise a positive decision, and they do not include all the work needed to get an application ready. A drawing review that identifies deficiencies is not the same as permission to begin construction.

A complete application is more than uploaded drawings

A complete submission includes the application information, required drawings and supporting documents, fees and the applicable-law requirements for the project. The exact requirements vary with the work and municipality. A portal accepting an upload does not by itself establish that the application is complete.

Toronto distinguishes complete and incomplete applications in its permit review streams. Its House Stream requirements include zoning and applicable-law documentation. Check the stream for your project rather than assuming every residential renovation follows the same submission checklist.

Mississauga’s published guidance distinguishes prescreening from first review. It lists different first-review times for residential applications and second units, and says incomplete applications and resubmissions do not have the same guaranteed timelines. This is one reason not to apply a universal ‘10 days for any basement’ promise.

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Separate design, zoning and building review in your schedule

A useful project schedule tracks distinct stages. Site measurements and design happen before submission. Zoning checks or other approvals may need to be resolved before the building application is considered complete. The municipal review then checks the proposal against the applicable requirements.

If the proposed design needs zoning relief, such as a minor variance, that is a separate approval process. Other applicable laws may also create prerequisites. These steps should not be hidden inside an optimistic estimate for the building-permit review alone.

• Existing-condition measurements and concept layout.
• Zoning and applicable-law checks, with additional approvals where required.
• Permit drawings, consultant coordination and supporting documentation.
• Municipal submission, completeness checks and plan review.
• Responses to comments, permit issuance and construction-stage inspections.

Why reviewer comments can extend the process

A reviewer may ask for clarification, missing information or revisions to a detail. The designer must coordinate the response, update affected documents and resubmit them. If a change affects several drawings or consultant inputs, it can take more than one clarification to resolve.

Do not assume a resubmission receives a new guaranteed 10-day approval window. Local review procedures vary. Ask what remains outstanding and who is responsible for each response so that drawings, forms and consultant documents move together.

How homeowners can reduce avoidable delays

Define the intended use before drawings begin. For a basement, be clear whether you want a family recreation space or a separate dwelling. For an addition or custom home, resolve the major layout and zoning questions before committing to a construction start date.

Provide any existing surveys, drawings and permit records you have. Agree on the project scope with the designer and identify consultant input early. A coordinated submission can reduce omissions, but no designer can guarantee a municipality’s approval date.

• Use the municipality’s current checklist for your particular project.
• Ensure existing and proposed conditions are clearly distinguished.
• Keep one coordinated set of drawings and responses to review comments.
• Avoid late design changes that invalidate earlier checks or documents.

When should you book construction?

Discuss a provisional schedule with your contractor, but do not treat the first upload date as the construction start date. For work that requires a permit, obtain the applicable permit before starting. Plan inspection stages as well as the design and application stages.

Before making firm commitments, ask: Is zoning resolved? Is the application complete? Are reviewer comments still outstanding? Has the permit actually been issued? Those answers are more useful than a generic ‘four to eight weeks’ estimate.