01 / PRIMARY PATH
New Structural Design
You have an architectural concept, permit drawing set, renovation idea or construction scope that changes the structure and needs new engineering analysis, calculations and structural details.
◆ Structural design for permit projects
Structural Engineering & Permit Drawings in Toronto
Planning a renovation, addition, new build or commercial alteration that affects the structure? iPermit helps define the structural scope, coordinate the required project information and prepare the engineering work for permit submission.
◆ Choose the right structural path
Which Structural Design Path Are You Actually On?
Your next step depends on what already exists and what has already happened on site. Start with the condition of the project, not the service label.
02
Existing Drawings Need Professional Review
Another designer, contractor or consultant has already prepared drawings and the question is whether a licensed professional can review, revise and take responsibility for the defined engineering content.
03
The Work Is Already Built
An inspector, contractor or owner needs a professional opinion about completed or partly completed structural work. That is a site-evidence and sign-off problem, not the same assignment as designing new work from drawings.
04
Toronto Building Has Issued Structural Comments
The file is already under municipal review and the examiner has asked for calculations, structural details, revised drawings or clarification. Send the full submitted package and the current comment letter so the response can be scoped in context.
05
Excavation, Shoring or Temporary Support Is the Main Issue
Permanent building design and temporary excavation-support engineering are not automatically the same scope. Identify deep excavation, neighbouring foundations, temporary support or construction-stage stability early so the responsibility can be routed correctly.
Ready to Define Permit Path?
Send project context first, the next step can then focus on scope, information gaps and the right page or service route.
◆ Structural design basis
What the Structural Design Has to Resolve
Structural design starts with the existing load path. Before changing a wall, opening, floor, roof or foundation, the design needs to establish what is carrying the loads now and where those loads ultimately reach the supporting structure.
The proposed work then creates a new load path. New beams, posts or other structural members are only part of the solution. Their reactions still have to be transferred safely through the structure and into suitable walls, columns, footings or foundations.
The final design also depends on member sizing, connections and existing-condition verification. Concealed framing, previous alterations or unexpected site conditions can change the assumptions and may require additional investigation before the structural solution is finalized.
What carries the load now?
The existing structure needs to be understood before anything is removed or altered. That may include floor and roof framing direction, bearing walls, beams, posts, foundations and other elements forming the current load path.
What changes when the project is built?
Removing a wall, creating a larger opening, adding another storey or changing concentrated loads can redirect forces through parts of the building that were not originally designed for them.
What structural members are required?
The solution may involve beams, joists, lintels, posts, columns, reinforcement, foundations or other structural components. Member selection depends on span, loading, geometry, material and the surrounding construction.
Where do the reactions go?
Designing a beam is not enough. Its end reactions and other concentrated loads still need a reliable path through posts, walls, framing and foundations. Existing supports may need to be checked or strengthened.
How are the pieces connected?
Connections are part of the structural system. Bearings, fasteners, hangers, plates, anchors and other details need to transfer forces between members while fitting the actual construction conditions.
What existing conditions need confirmation?
Existing drawings do not always show what is actually inside the building. Framing direction, member sizes, foundation geometry, concealed connections and previous alterations may need to be confirmed before finalizing the design.
When Does a Toronto Project Need Structural Engineering?
Structural engineering typically enters a project when the proposed work changes the way loads are carried, introduces new structural elements or foundations, depends on existing structural capacity, or falls within a project condition where professional engineering is required.
Common examples include enlarging an opening in a load-bearing wall, adding another storey, supporting a large new opening, modifying foundations, underpinning, adding concentrated equipment loads, designing a new structural frame or making a commercial alteration that changes the existing load path.
But the right question is not simply, “Do I need a stamp?” The useful first question is: What structural problem has to be solved, and what information does the responsible professional need before taking responsibility for that design?
Some projects can be scoped from a reliable existing drawing set. Others need a site visit, selective exposure, measurements, previous permit records or coordination with the architectural design before the structural work can be completed. The required professional role also depends on the actual project and the engineering content involved.
If your main need is an architectural or complete permit drawing package rather than new structural analysis, start with Building Permit Drawings. If another designer has already prepared the engineering drawings and you need professional review of that existing file, the better route may be Engineering Review & P.Eng Stamp.
◆ Existing-building reality
Existing Conditions Can Change the Structural Design
Existing buildings often hide structural conditions behind finishes or previous renovations. If the design depends on an existing beam, column, foundation, wall or framing direction, those conditions may need to be verified before the structural solution is finalized.
Verification can involve existing drawings, photos, measurements, localized openings or a site review. The goal is to confirm the assumptions that materially affect the design before construction moves forward.
◆ Structural project scenarios
Common Projects That Can Trigger Structural Design
Structural requirements depend on what is changing in the building and how that change affects the existing load path.
Structural openings and alterations can include removing a load-bearing wall, widening an opening or changing existing framing. The design may need new beams, posts, headers, connections and checks on the supports below.
Additions and new structures can introduce new gravity and lateral loads, foundations and framing systems. The structural work also needs to coordinate with the existing building where new construction connects to it.
Foundation and existing-building changes can involve underpinning, modified foundations or other work where soil conditions, existing footings and construction stages affect the engineering approach.
Commercial and specialty structural work may include mezzanines, rooftop equipment, suspended loads, equipment supports, retaining structures or other concentrated loads that need to be checked against the existing building and the proposed use.
Ready to Define Permit Path?
Send project context first, the next step can then focus on scope, information gaps and the right page or service route.
◆ Structural design process
How Structural Engineering Moves From Concept to Permit
The useful sequence is scope → evidence → analysis → coordination → final documents. Site review and construction-stage obligations are scoped separately when required.
01
Scope
Define the project and responsibility
Confirm the property, proposed work, current project stage and why structural engineering is being requested. Establish whether the need is new design, an existing-file review, a municipal response or a construction-stage issue.
Start
02
Evidence
Review existing information
Collect the current architectural drawings, survey or site information, previous structural documents, photos, permit records and any available base-building information. Identify what is reliable and what is still unknown.
Inputs
03
Analysis
Establish the structural design basis
Determine the loads, spans, materials, support conditions, structural system and field assumptions that affect the engineering analysis. Decide whether measurements, selective exposure or a site review are needed before final design.
Design basis
04
Coordination
Develop and coordinate the structural solution
Prepare the structural analysis, calculations and details required for the agreed scope, then coordinate the result with the architectural layout and other disciplines affected by beams, columns, openings, equipment or foundations.
Coordinate
05
Issue
Finalize the engineering documents
The responsible professional reviews the final engineering content and takes responsibility for the defined scope through appropriate signed and sealed documentation where required. The documents should identify relevant assumptions, details and construction notes.
Final
06
Follow-through
Respond to permit comments and construction-stage needs
If Toronto Building requests clarification within the structural scope, coordinate the response and revised documents. Site review, general review, field changes and sign-off letters may be separate construction-stage services.
Support
◆ Scope boundaries
Structural Drawings Are One Layer of the Permit Package
Structural engineering is often one part of a larger permit and construction file. Keeping the scopes separate makes it clearer who is responsible for each document and construction-stage activity.
| Scope | What it generally addresses |
|---|---|
| Structural engineering drawings & calculations | Load paths, structural members, supports, foundations, connections, structural notes and calculations within the defined engineering scope. |
| Architectural / building permit drawings | Floor plans, elevations, sections, site information, occupancy and the broader permit documentation. These often provide the base information for structural coordination. |
| Shop & fabrication drawings | Fabrication or installation information for specific products or systems. Review or delegated design can carry its own professional responsibility and is not automatically included in the base structural scope. |
| Site review, general review & sign-off | Construction-stage professional services based on work in the field. These should be scoped separately rather than assumed to be included with the original structural drawings. |
Ready to Define Permit Path?
Send project context first, the next step can then focus on scope, information gaps and the right page or service route.
◆ Professional responsibility
P.Eng Responsibility in a Toronto Permit File
A seal identifies responsibility for engineering content — it does not replace the rest of the approval process. The points below separate the engineering role from zoning, permit approval and construction-stage review.
What the P.Eng seal means
When a licensed Professional Engineer signs and seals a final engineering drawing, report, plan or specification, the professional is taking responsibility for the engineering content covered by that document. The seal should match a real professional scope, not be treated as a decorative approval mark.
Toronto AREC for applicable sealed house-project documents
For applicable Toronto house-stream projects that include P.Eng-sealed engineering documents, the designing engineer may need to complete the City’s Assumption of Responsibility for Engineering Content form to identify the content for which professional responsibility is being assumed.
Permit approval is still a municipal decision
A sealed structural document does not guarantee that a building permit will be issued. Toronto Building still reviews the application, and zoning, applicable law, architectural, mechanical, electrical or other project requirements may remain outside the structural engineer’s scope.
General review can be a separate construction-stage obligation
Some projects require professional field review during construction. Toronto identifies specific underpinning conditions where Professional Engineer design and on-site review are required. That construction-stage role should be identified early because it is not automatically the same as preparing the design drawings.
For iPermit projects, the practical goal is to make the responsibility path clear: organize the project information, coordinate the structural scope and ensure the licensed professional responsible for the engineering content has the information needed to complete that work.
◆ Project intake
What to Send for a Structural Scope Review
You do not need a complete engineering package to start. The initial review is intended to understand the structural problem and identify what information may still be required.
Start with the property address, a short description of the structural change being proposed, and the latest drawings or sketches available. This may include architectural plans, sections, contractor sketches or previous permit drawings.
For an existing building, send any information that helps explain the current structure, such as photos, previous structural drawings, permit records or visible framing and foundation conditions.
If Toronto Building has already reviewed the project, include the full submitted drawing set and current City comments. Also tell us if construction has started or if site conditions have already changed from the drawings.
Additional items such as a survey, base-building documents or landlord information can be provided when relevant. The initial review can identify which of those inputs are actually needed for the structural scope.
◆ Route the file correctly
Related Permit & Engineering Paths
Structural engineering may be only one part of the project. Use the route that matches the state of your file rather than forcing every issue into a new-design scope.
BUILDING PERMIT DRAWINGS
Building Permit Drawings
Choose this route when you still need the architectural / permit drawing base, project sections, elevations or a coordinated building-permit package before the structural work can be integrated.
EXISTING DRAWINGS
Engineering Review & P.Eng Stamp
Choose this route when a structural or other engineering drawing already exists and the main question is whether a licensed professional can review, revise and take responsibility for the defined engineering content.
WORK ALREADY BUILT
Engineering Sign-Off Letter & Site Review
Choose this route when work is already installed or an inspector is asking for a professional opinion, conformance letter or construction-stage engineering review based on what is actually on site.
TEMPORARY WORKS
Shoring Design
Choose this route when excavation, neighbouring foundations, temporary support or construction-stage stability is the main engineering problem rather than the permanent building structure.
◆ Structural engineering questions
Structural Engineering FAQs
Questions clients ask before structural design starts. The exact answer still depends on the building, proposed work and the professional responsibility required for the project.
When do I need a structural engineer in Toronto?
Structural engineering is commonly needed when a project changes load-bearing walls, framing, foundations, structural openings, additions, equipment support or other elements that affect how loads are carried. Some project conditions specifically require Professional Engineer design or site review. The exact requirement depends on the building, proposed work and permit path.
What is included in structural engineering drawings?
Depending on the project, the structural package can include framing plans, beam and column design, headers, foundations, connection details, reinforcement, structural notes and related calculations. The scope should be defined from the project rather than assumed from a standard drawing checklist.
Do structural drawings always need a P.Eng stamp?
Not every permit project has the same professional-design requirement. Where a licensed Professional Engineer prepares or checks final engineering content for a client, the final engineering documents are signed and sealed within that professional’s scope. The correct design responsibility depends on the project and applicable requirements.
Can structural engineering be added to drawings I already have?
Yes, if the existing architectural or permit drawings provide a reliable basis for the structural scope. The current revision, dimensions and proposed work still need to be checked, and additional information may be required before the structural design can be finalized.
Does the structural engineer need to visit the property?
Sometimes. A site visit may be needed when the design depends on existing conditions that cannot be established from reliable drawings, photos or other records. Other projects can begin from good documentation and identify specific items for field verification during construction.
What if the framing or foundation is hidden behind finishes?
The design may need documented assumptions and a verification plan. Depending on how important the hidden condition is, the next step could be photos from an accessible area, previous permit drawings, selective exposure, measurements or a site review before the final design is issued.
Need structural engineering for a permit project?
Send the address, current drawings or sketches, a short description of the proposed structural change and any photos or City comments you already have. iPermit will use that information to define the structural path and the next professional inputs the file needs.