Building Permit Timelines in Ontario: What to Really Expect
Updated: Sep 20
Every commercial project schedule I am asked to review has one line that is almost always wrong, and it is the permit line. It is usually shown as a tidy six-week bar with a clean start and a clean finish. Real approvals do not behave that way.
The honest answer about building permit timelines in Ontario is that the statutory review clock is short, predictable and rarely the problem. What takes the time is everything that has to be true before that clock can start, and what happens when the first review comes back with comments.
What the law actually promises
Under Ontario's Building Code, a municipality has a prescribed number of business days to review a complete permit application and either issue the permit or give written notice of why it cannot be issued. The common tiers are 10 business days for a house, 15 for small commercial and industrial buildings, 20 for larger buildings, and 30 for the most complex categories such as post-disaster and high-hazard occupancies.
Two words carry all the weight in that sentence. The first is complete. The clock does not start when you hand in a package, it starts when the municipality agrees the package is complete. The second is or. The municipality satisfies its obligation by issuing a refusal letter listing deficiencies, and that resets you to the beginning once you resubmit.
Why building permit timelines stretch
Site plan approval usually comes first
For most new commercial buildings and many significant additions, the building permit is not the long pole. Site plan approval is. That is a municipal planning process covering grading, servicing, parking, landscaping, waste storage, fire routes and urban design, and it involves circulation to internal departments and external agencies. Depending on the municipality and the complexity, it commonly runs three to nine months, sometimes longer, and it typically has to be substantially resolved before a full building permit will issue.
Other approvals run on their own clocks
Conservation authority permits, regional or provincial road access permits, Ministry of the Environment approvals, heritage permits, committee of adjustment for minor variances, and utility servicing agreements all have their own review cycles. None of them care about your building permit clock. Any one of them can hold the project.
The first review is almost never the last
Plan an initial review, a comment letter, a revision cycle and a second review. On complex projects, plan for two revision cycles. Each cycle is your consultant's turnaround plus the municipality's re-review. That is where weeks disappear.
What actually shortens the calendar
Pre-consultation. Most municipalities offer or require a formal pre-application meeting. Take it seriously, bring real drawings, and leave with a written list of what a complete submission includes.
Apply for a conditional or partial permit. Ontario allows conditional permits in defined circumstances, and many municipalities issue staged permits for excavation, shoring and foundation while the superstructure review continues. Staging permits is the single most effective way to protect a schedule.
Use a registered code consultant. On anything complicated, a code review done before submission prevents the deficiency letter that costs a month.
Answer comments completely the first time. Partial responses trigger another full cycle. Track every comment to a written, drawing-referenced response.
Name one person to own the approvals log. Every permit, agency, submission date, expected response date and status in one document, reviewed weekly.
Planning numbers to use until you know better
These are planning assumptions, not promises, and they vary widely by municipality:
Interior tenant fit-up with no change of use: permit in roughly four to eight weeks including one revision cycle.
Addition or renovation with structural and mechanical change: eight to sixteen weeks.
New commercial building requiring site plan approval: six to fourteen months from application to permit in hand, with the site plan process consuming most of it.
If a schedule in front of you shows a new building going from concept to permit in three months, the schedule is a wish.
The honest summary
Building permit timelines are governed by a short statutory review period and a long list of prerequisites. Owners who lose time lose it in the approvals that precede the permit and in the revision cycles that follow the first review, not in the municipality's review window itself. Map every approval, pre-consult, stage the permits, and give one person the log.
Common questions about building permit timelines
How long does a building permit take in Ontario?
The statutory review clock is short and is rarely the problem. As planning numbers: roughly four to eight weeks for an interior fit-up with no change of use, eight to sixteen weeks for a renovation with structural and mechanical change, and six to fourteen months for a new building that needs site plan approval.
When does the permit review clock actually start?
When the application is complete, not when you hand in a package. An incomplete submission does not start the clock at all, and that is where most of the lost time goes.
Why do permits take longer than the statutory review period?
Because the permit is usually not the long pole. Site plan approval, conservation authority permits, road access approvals, environmental and heritage approvals and committee of adjustment decisions all sit in front of it, and every review cycle adds a comment letter and a revision round.
What actually shortens the approvals calendar?
Take pre-consultation seriously and bring real drawings, ask about a conditional or staged permit, get a code review done before submission, answer every comment completely the first time, and give one named person the approvals log.
If you are building a schedule and want the approvals path stress-tested before you commit to a date, that is a short conversation worth having. You can see how I work with owners and project partners on project solutions.
This article is general information about commercial construction practice in Ontario, not legal advice. Confirm requirements with your municipality and your own advisors.
Connect with Carolee on LinkedIn: linkedin.com/in/carolee-w-turner-2002417
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