Across the Greater Toronto Area, homeowners are unlocking serious value from space they already own — by adding garden suites and secondary suites. Whether the goal is rental income, room for aging parents, or a private space for adult children, these units have become one of the smartest investments a GTA property owner can make. Here is what is possible in 2026.
Secondary suite vs. garden suite — what is the difference?
A secondary suite is a self-contained unit within your existing home — most commonly a legal basement apartment with its own entrance, kitchen, and bathroom. A garden suite (sometimes called a laneway or coach house, depending on the municipality) is a separate, smaller dwelling built in your backyard. Both are designed to be fully legal, permitted, and built to code.
Why they are worth it
Income. A legal suite can generate meaningful monthly rent and improve your property value.
Flexibility. Multigenerational living, a home office, or a space for family — without moving.
Long-term value. Done correctly and legally, a well-built suite is an asset, not a liability.
What is allowed in 2026
Ontario and GTA municipalities have steadily expanded permissions for additional residential units, but the specifics — size limits, setbacks, parking, and servicing — vary by municipality and by lot. That is exactly why the planning stage matters: a suite designed around your municipality rules sails through approvals; one that is not can stall for months. A design-build team that handles permits daily will know what your lot can support before you commit.
What they cost
Cost depends on size, finishes, and servicing (running water, sewer, and electrical to a backyard suite adds cost versus finishing an existing basement). As with any build, a detailed estimate beats a generic figure — but the return, especially for rental income, often makes suites one of the highest-ROI projects a homeowner can take on.
How GrandBuild builds suites
We design and build legal, durable secondary and garden suites across Mississauga, Toronto, and the GTA — managing planning, permits, construction, and finishing as one accountable team. The result is a turn-key suite built for tenant comfort, code compliance, and long-term performance.
Curious whether your property can support a garden or secondary suite? Book a consultation and we will assess what is possible.