What Are the Three Phases That Determine Your Timeline?

Every building permit application moves through three distinct phases. Each has its own timeline, and each can either compress or extend the total duration depending on how the work is managed.

Phase 1 — Drawing Production (2 to 6 weeks)

Before anything gets submitted to the municipality, your permit drawings have to be produced. For a straightforward residential renovation — an interior alteration, a deck, a basement finishing — drawing production typically takes 2 to 3 weeks from a finalized design. For additions, new construction, or projects requiring structural, mechanical, or plumbing engineering, the timeline extends to 4 to 6 weeks to allow for engineering coordination and integration.

This phase is entirely within the control of your permit consultant and drawing team. A firm with an in-house workflow and coordinated engineering relationships moves faster than one that queues drawing requests and outsources engineering separately.

Phase 2 — Municipal Examination (varies widely)

Once submitted, your application enters the municipal examination queue. An examiner reviews the drawings against the Ontario Building Code and the local zoning bylaw. This phase varies more than any other — from as few as 4 weeks in smaller municipalities to 14+ weeks in Toronto during peak backlog periods. The examination timeline is largely outside your control once the application is submitted, which is why Phase 1 completeness matters so much.

Phase 3 — Revision Rounds (1 to 3 weeks each)

Approximately 80% of permit applications receive examiner comments requiring revisions before approval. This is normal — it does not mean the application was rejected. It means the examiner identified items requiring clarification or correction. Each revision round adds 1 to 3 weeks: time to prepare the revisions, resubmit, and wait for the examiner to re-review. Most applications go through 2 to 3 rounds. A poorly prepared first submission can trigger more.

Examination Timelines by Municipality

The table below shows examination timelines for the GTA’s primary municipalities. These are first-review timelines — the time from a complete submission to the examiner’s first response. Total permit timelines will be longer once revision rounds are factored in.

Municipality	Project Type	Examination Timeline	Notes
Toronto	Residential (all types)	8 – 14 weeks	Among the longest in the GTA. Digital submission via Intake Portal required.
Mississauga	Residential alterations	~7 weeks	Pre-screen required before entering examination queue.
Mississauga	Secondary units	~10 weeks	Applicable Law Checklist required at submission.
Mississauga	New residential construction	~13 weeks	Full engineering package required.
Vaughan	Residential alterations	4 – 8 weeks	ePermits portal. TRCA overlap common in regulated areas.
Brampton	Residential (all types)	6 – 10 weeks	ARU registration required for secondary units. CVC overlap possible.
Markham	Residential (all types)	6 – 10 weeks	42 zoning bylaws in effect — bylaw identification critical before submission.
Richmond Hill	Residential (all types)	6 – 10 weeks	Oak Ridges Moraine restrictions apply to portions of the city.
Oakville	Residential (all types)	4 – 8 weeks	Fast-track available for qualifying projects. Conservation Halton overlap common.
Burlington	Residential (all types)	5 – 9 weeks	Zoning Clearance Certificate required at submission.
Hamilton	Residential (all types)	6 – 10 weeks	Permit fee doubled if work starts before permit issued.
Newmarket	Residential (all types)	4 – 8 weeks	LSRCA approval required for properties in regulated areas.

What Slows a Permit Down?

Incomplete first submissions. Most municipalities run a pre-screen before your application enters the examination queue. If the package is incomplete — missing forms, wrong PDF format, absent engineering, incorrect fees — it gets bounced before an examiner ever sees it. You lose the queue position and restart the clock. This is entirely avoidable with a complete, correctly formatted submission.

Multiple revision rounds. Each round of examiner comments adds time. Firms that produce thorough, well-coordinated drawing packages with consistent dimensions, complete structural details, and properly integrated engineering typically see fewer revision rounds than firms that treat the first submission as a rough draft.

External approvals running sequentially. Conservation authority approvals, heritage permits, and committee of adjustment decisions must all be in hand before the building permit can be issued. If these are initiated after the building permit application is submitted, they add their full timeline on top. Running them in parallel from the start compresses the total project duration significantly.

Slow revision responses. Once an examiner sends comments, the clock stops on their end and starts on yours. Every day between receiving comments and submitting a response is a day added to your timeline. This is one of the most controllable variables in the process — and one of the most commonly mismanaged.

Municipal backlogs. Examination queues fluctuate. Toronto’s backlog in particular has grown significantly as residential construction volumes increased faster than examiner capacity. Seasonal peaks in spring and early fall typically see longer wait times than winter months.

What Speeds a Permit Up?

A complete, correctly formatted first submission. The single most impactful thing you can do is submit a complete package the first time. Every pre-screen bounce and every avoidable revision round costs 2 to 4 weeks. A thorough first submission that clears pre-screen and generates minimal examiner comments compresses the total timeline more than any other factor.

Fast revision responses. A firm that responds to examiner comments within 2 to 3 business days keeps the file moving. A firm that queues revision requests internally and responds in 2 to 3 weeks doubles the impact of every comment round.

Parallel external approvals. If your project requires a conservation authority clearance or a committee of adjustment decision, initiating those applications at the same time as the building permit — rather than sequentially — can save 6 to 12 weeks on the total project timeline.

Fast-track programs. Some municipalities offer expedited review for qualifying projects. Oakville’s fast-track program can significantly reduce examination timelines for straightforward residential applications that meet specific criteria. Knowing which municipalities offer these programs and which projects qualify is part of what an experienced permit consultant brings to the table.

Knowing the municipality. Every building department has its own formatting preferences, submission requirements, and examiner tendencies. A firm that submits to the same municipalities regularly knows what each examiner expects to see — and how to present a package that clears review with minimal comments.

Bottom Line — Realistic Total Timelines by Project Type

Here is what to expect for common residential project types, from first call to permit in hand, including drawing production and revision rounds:

Project Type	Toronto	Most GTA Municipalities
Interior renovation (no structural)	12 – 18 weeks	8 – 14 weeks
Deck or detached structure	10 – 16 weeks	7 – 12 weeks
Basement apartment / secondary suite	14 – 22 weeks	10 – 18 weeks
Rear or side addition	16 – 24 weeks	12 – 20 weeks
Second storey addition	18 – 28 weeks	14 – 22 weeks
New custom home	20 – 32 weeks	16 – 26 weeks

These are realistic ranges — not worst-case scenarios and not best-case marketing numbers. Projects requiring committee of adjustment approval add 8 to 14 weeks on top. Conservation authority approvals add 4 to 8 weeks if not run in parallel.

For answers to more common permit timeline questions, visit our FAQ page. If you want a project-specific estimate based on your municipality and scope, contact us — we give you a straight answer in the initial consultation.