Building Permit Drawings — What’s in a Complete Package and Why It Matters
Most homeowners and contractors assume a building permit drawing package means floor plans. It does not. A complete submission includes six to ten distinct drawing types, engineering documents, and municipal application forms — all formatted to that municipality’s specific requirements. Missing any one of them gets your application bounced before an examiner ever sees it.
What Does a Complete Permit Drawing Package Include?
The exact components vary by project type and municipality, but a standard residential permit package for an addition or renovation includes the following:
Site Plan
Shows the property boundaries, existing structures, proposed additions, and all setback dimensions from the lot lines. It must be drawn to scale and derived from a current survey. This is the first thing an examiner checks — if the setbacks don’t comply with the zoning bylaw, everything else is irrelevant. A site plan based on an outdated survey or estimated dimensions is one of the most common reasons applications fail pre-screen.
Existing and Proposed Floor Plans
Two sets — what exists now, and what the finished project will look like. Both must be dimensioned, and the proposed plans must show all rooms, door and window locations, ceiling heights, and any structural elements being added or removed. For secondary suite applications, the floor plans must clearly show the separation between units, means of egress, and mechanical room locations.
Elevations
Exterior views of the building from all four sides — front, rear, left, and right. Elevations show building height, window and door placement, exterior materials, and grade relationships. For additions, the elevations must show both the existing structure and the proposed work in context. Heritage overlay areas require additional elevation detail.
Cross-Sections
Cuts through the building showing interior relationships — floor-to-ceiling heights, floor assembly construction, roof structure, insulation placement, and foundation details. Examiners use cross-sections to verify OBC compliance for structural, fire separation, and energy efficiency requirements.
Structural Details
For any project involving load-bearing changes — removing walls, adding floors, underpinning foundations, or building additions — structural details are required. These include beam and column sizing, connection details, foundation design, and footing specifications. Structural details must be prepared or reviewed and stamped by a licensed Professional Engineer (P.Eng.).
Mechanical, HVAC, and Plumbing Layouts
Required whenever the project affects mechanical systems — adding a bathroom, relocating ductwork, installing a new HVAC system, or adding a secondary suite with independent ventilation. The level of detail required varies by municipality and project complexity. Some municipalities require engineer-stamped mechanical drawings; others accept designer-prepared layouts.
Every municipality has specific requirements for how drawings must be formatted and submitted. Toronto requires flattened PDFs combined into a single file via its Intake Portal. Mississauga requires a pre-screen before drawings enter the examination queue. Burlington requires a Zoning Clearance Certificate at submission. Getting the format wrong means a pre-screen bounce — your application never reaches an examiner.
What Is the Difference Between Architectural and Engineering Drawings?
This distinction matters because both are required for most structural projects — and they are produced by different people with different qualifications.
Architectural drawings show design intent: the layout, dimensions, materials, and appearance of the finished project. In Ontario, architectural drawings for most residential work can be prepared by a designer holding a Building Code Identification Number (BCIN) — the designation issued by the Ministry of Municipal Affairs and Housing to qualified residential designers. Licensed architects (OAA) can also prepare architectural drawings, though they are typically engaged on larger or more complex projects.
Engineering drawings show structural, mechanical, or plumbing compliance. They must be prepared and stamped by a licensed Professional Engineer (P.Eng.) registered with Professional Engineers Ontario (PEO). Engineering drawings are not optional when the project involves structural changes — a BCIN designer cannot stamp structural work. Submitting architectural drawings without the required engineering is one of the most common reasons permit packages fail.
Many permit firms produce the architectural drawings and leave you to find and manage a structural engineer separately. At GTA Permits, we coordinate the full package — architectural and engineering — as a single workflow. The engineer works from our drawings, not around them. This eliminates the most common source of inconsistencies between architectural and structural pages.
What Does “Realistic to Build Off Of” Actually Mean?
There is a difference between drawings that get approved and drawings a contractor can actually build from. The gap between those two things is where a lot of projects go sideways.
Drawings that exist solely to satisfy the examiner tend to be technically compliant but practically vague — beam sizes are specified at the maximum allowable rather than the minimum required, material specifications are conservative across the board, and details are generic rather than site-specific. The result is drawings that pass review but require the contractor to make interpretation calls on the jobsite — or worse, drawings that specify materials and methods that inflate the construction cost significantly beyond what the project actually requires.
Drawings built for construction — not just approval — show realistic beam sizing based on actual span and load calculations, practical material specifications that reflect what is actually available and cost-effective, and connection details that a framer can execute without guesswork. The permit gets approved either way. The difference shows up in your client’s construction budget and your jobsite experience.
This is particularly relevant for general contractors who rely on permit drawings as the baseline for their construction scope. If the drawings over-specify, the estimate inflates. If the drawings under-specify, the RFIs multiply. GTA Permits produces drawings built for both approval and construction — not drawings optimized for one at the expense of the other.
Common Drawing Mistakes That Delay Permits
Missing engineering. Submitting architectural drawings without required structural, mechanical, or plumbing engineering is the most common pre-screen failure. The municipality will bounce the application immediately. Engineering must be scoped, coordinated, and integrated before submission — not added after the fact.
Dimensions that don’t match the survey. If the site plan shows setback dimensions that differ from the current survey, the examiner flags it as a discrepancy and issues a comment. This adds a revision round. The site plan must be drawn from a current survey, not estimated or scaled from an old one.
Inconsistencies between architectural and structural pages. When the architectural drawings show a beam in one location and the structural drawings show it in a different location, the examiner cannot approve either. Coordination between the architectural and engineering scopes is not optional — it is the applicant’s responsibility to deliver a consistent package.
Wrong PDF formatting for the portal. Toronto requires a single flattened PDF. Mississauga requires specific file naming conventions. Vaughan’s ePermits portal has its own upload structure. Submitting a package in the wrong format gets it bounced at intake — before it even enters the pre-screen queue.
Incomplete site plan. Missing north arrow, no scale bar, setback dimensions not labelled, lot area not stated — any of these triggers a pre-screen deficiency. The site plan is the first document an examiner reviews. It needs to be complete and correct.
What to Look for When Evaluating a Permit Drawing Firm
Not all permit drawing firms offer the same scope. Before you engage one, ask these questions:
Do they produce the full package — architectural and engineering? Many firms produce only architectural drawings and leave you to source, hire, and coordinate a structural engineer independently. This creates coordination gaps and adds time. A turnkey firm handles both.
Do they submit to the municipality, or hand you a PDF? Submission involves more than uploading a file. It means knowing the municipality’s portal, formatting requirements, supporting forms, and fee structure. A firm that hands you a PDF and tells you to submit it yourself is offloading the most municipality-specific part of the process onto you.
Do they handle revision rounds? Examiner comments are normal — they happen on roughly 80% of applications. A firm that produces drawings but disappears when comments arrive is not a permit partner. Revision management is part of the job.
Do they know your municipalities? A firm that submits regularly to Toronto, Mississauga, Vaughan, Brampton, and Markham knows what each examiner expects. A firm that works primarily in one municipality and occasionally ventures into others is guessing on the edge cases.
For a full breakdown of what our drawing packages include and how our process works, visit our building permit drawings service page. If your project involves structural or mechanical work, see our specialty drawings page for engineering scope details. General contractors can find information about how our GC partnerships work on our For Contractors page.
Need a Complete Permit Drawing Package?
We handle architectural, engineering, submission, and revision management — one team, one file, one point of contact.
