Structural Letter of Assurance Calgary | What It Is & Why You Need It

What Is A Structural Letter Of Assurance In Calgary?

A Structural Letter of Assurance in Calgary is a legal document provided by a licensed structural engineer (P.Eng.) confirming that structural design plans meet applicable building codes and that the engineer will be responsible for reviewing and inspecting the work. This letter is commonly required as part of the permitting process for renovations, additions, or new residential construction projects. At Calgary Structural Engineers, we routinely issue these letters for homeowners, builders, and architects to meet permit requirements and ensure code compliance.

Understanding Letters of Assurance in Calgary’s Building Process

What Is a Structural Letter of Assurance?

A Structural Letter of Assurance (LOA) is a formal statement from a licensed professional engineer that certifies the structural design of a project complies with Alberta Building Code and City of Calgary regulations. This letter also affirms that the engineer will remain involved throughout the project to inspect and review the implementation of the design.

Why Is It Required?

• To confirm the safety and code compliance of a structural design
• To legally transfer responsibility for the design to a licensed professional
• To ensure proper oversight during construction
• To satisfy City of Calgary permitting requirements for structural work

When Do You Need a Structural Letter of Assurance in Calgary?

Required for Certain Projects

If your renovation or new construction involves structural changes, such as:

• Removing or altering load-bearing walls
• Adding new floors or extensions
• Modifying the foundation
• Creating large window or door openings
• Installing beams, joists, or other load-supporting members

...you’ll likely need a Structural Letter of Assurance from a P.Eng. for your permit submission to be approved.

City of Calgary Expectations

The City of Calgary often requires both Schedule B (Design Letter) and Schedule C (Construction Review Letter) from the engineer. The LOA confirms both the initial design and that the work was reviewed during or after completion.

Residential, Commercial & Secondary Suites

Letters of Assurance are required in all project types where structural modifications are involved. Even legal secondary suites may require a structural LOA depending on wall removal, window installation, or other modifications.

What’s Included in a Structural Letter of Assurance?

Design Responsibility (Schedule B)

• Confirms that the engineer designed or reviewed the structural plans
• Lists the applicable codes and standards
• Includes the engineer’s seal and signature

Construction Review (Schedule C)

• Verifies that the structure was built according to the stamped plans
• Confirms field review was completed as required
• Reiterates the engineer’s accountability

Drawings and Documentation

The LOA is typically submitted along with:

• Structural plans
• Calculations
• Supporting design documentation

How Calgary Structural Engineers Can Help

1. Design & Assessment

We evaluate your project’s scope, conduct site visits if needed, and prepare detailed structural drawings.

2. Engineer Stamped Letters

We provide Schedule B and Schedule C Letters of Assurance with full compliance to Calgary’s permit requirements.

3. City Submission Guidance

Our team guides homeowners, builders, and architects through the process of submitting the LOA and supporting documents.

4. On-Site Inspections

We offer follow-up site inspections to ensure the construction matches the stamped design.

5. Permit Approval Support

We help respond to any city feedback, ensuring smooth progression of your project.

Why a Structural Letter of Assurance Matters

Legal Requirement

Without a Structural Letter of Assurance, the City of Calgary may reject your permit application, especially for any structural alterations.

Peace of Mind

It’s more than a document—it’s a professional promise that your structure is sound, safe, and compliant.

Accountability & Oversight

Having a structural engineer oversee your project helps avoid design flaws, unsafe construction, and costly corrections.

Faster Permit Approvals

When a qualified structural engineer is involved and a letter of assurance is included, your application is more likely to be approved quickly.

6 Questions People Ask About Structural Letters of Assurance in Calgary

Is a structural letter of assurance always required for home renovations?No, but it is required for any renovation that affects load-bearing components, foundations, or other structural systems. For non-structural work, it’s usually not needed.

Who can issue a Structural Letter of Assurance in Calgary?Only a licensed professional engineer (P.Eng.) registered with APEGA (Association of Professional Engineers and Geoscientists of Alberta) can issue this letter.

Can I submit a permit application without a Structural Letter of Assurance?You can, but if your project includes structural work, the City will likely place your application on hold until you provide an LOA from a qualified engineer.

What happens if my project doesn’t match the stamped drawings?The engineer will need to review the changes, and updated drawings and a revised LOA may be required. Unauthorized deviations can lead to permit issues.

How do I know if I need a Structural Letter of Assurance for my project?Consult with a structural engineer. At Calgary Structural Engineers, we can evaluate your design and advise whether an LOA is required.

Is the letter valid indefinitely?The letter is typically valid as long as the design remains unchanged and the permit is active. However, delays in construction or design changes may require updates or reissuance.

Final Thoughts

So, what is a Structural Letter of Assurance in Calgary? It’s a key part of ensuring the structural safety of your renovation or build. Required by the City of Calgary for many residential construction projects, this letter confirms that a licensed structural engineer has reviewed and approved your design—and will oversee the work. If your project involves structural changes, working with an experienced engineer is essential.

Calgary Structural Engineers is a trusted choice for residential structural engineering services in Calgary, Alberta. You can request a quote by calling us or requesting one online:

Request A Quote Online: https://calgarystructuralengineers.ca/request-a-quote

Call Us For A Quote: (587) 355-2031

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