Structural Design for Residential Addition – Toronto
Parsways Inc. provided structural engineering services for a residential addition to an existing detached dwelling in Toronto (Scarborough), Ontario. The scope included foundation design, structural framing, and coordination between the new structure and the existing building system.
The design was prepared in accordance with the Ontario Building Code (OBC 2024) and applicable CSA standards, as part of a building permit submission package.
Location: Toronto, Ontario
Completion: December 2025
Sector: Residential
1. The Challenge
The project involved extending an existing single-family home, requiring careful integration between new and existing structural systems.
Connection to Existing Structure:
The addition required integration with the existing framing system, including selective removal of exterior finishes to access structural elements for proper connection.
Foundation Coordination:
A new foundation system had to align with the existing structure to ensure consistent load transfer and long-term stability.
Moisture and Durability Considerations:
Special detailing was required at connection points to prevent moisture transfer and ensure long-term performance.
2. The Engineering Solution
A coordinated structural system was developed with focus on clear load paths, constructability, and durability.
a) Foundation Design:
A reinforced concrete foundation system was designed to support the new addition and work in alignment with existing site conditions.
b) Structural Framing and Load Transfer:
Engineered wood framing members were used with designed connections to the existing structure to ensure proper load transfer and continuity.
c) Interface Detailing:
Separation and protection details were introduced at all connection points between new and existing materials to manage moisture and durability.
3. The Outcome
The project resulted in a complete, permit-ready structural drawing package submitted for municipal approval in Toronto. The design ensured a clear load path, proper structural integration, and a safe, code-compliant residential addition.