Garden suites and laneway suites have become one of the most popular ways for Toronto and Ontario homeowners to add rental income or multi-generational living space. But they are permanent, habitable structures — and they require a complete structural engineering package for the building permit.
What Is a Garden Suite?
A garden suite (also called an Additional Dwelling Unit or ADU) is a self-contained residential unit built in the backyard of an existing property, separate from the main house. Toronto and many Ontario municipalities now permit garden suites under specific zoning conditions.
What Structural Engineering Is Required for a Garden Suite?
A complete garden suite permit application requires:
- Foundation design — footings, foundation walls or slab-on-grade system designed for Ontario soil conditions and frost depth
- Floor framing design — sized and connected to carry residential loads
- Structural wall design — load-bearing wall system coordinated with architectural drawings
- Roof structure design — designed for Ontario snow and wind loads
- P.Eng.-stamped drawings for the complete structural system
How AMGH Engineering Helps with Garden Suite Permits
AMGH Engineering provides the complete structural engineering portion of your garden suite permit application. We coordinate with your architect or designer to ensure the structural and architectural drawings are consistent — producing a unified, complete submission package ready for the City of Toronto or your local municipality.
Building a Garden Suite in Toronto or Ontario?
AMGH Engineering provides complete structural engineering for garden suites and laneway suites across Ontario. P.Eng.-stamped drawings, fast turnaround, competitive pricing.
Get a Free Quote →Written by Ahmed Hamed, M.Eng., P.Eng. — Principal Engineer, AMGH Engineering. Licensed by the Professional Engineers of Ontario (PEO). 1,000+ projects completed across Ontario and PEI.