Ontario legislation removed municipal authority to block garden suites through zoning. This is provincial policy, not a municipal option.
Garden suite investing
Garden Suites Investment Guide
Ontario's garden suite opportunity — how to add income-producing units to existing properties.
Overview
What are garden suites?
A garden suite is a self-contained residential unit built in the rear yard of an existing property. They are detached from the main house and include their own kitchen, bathroom, living space, and separate entrance.
Ontario's Bill 23 (More Homes Built Faster Act, 2022) established as-of-right zoning for garden suites across the province. This means municipalities cannot prohibit garden suites through zoning bylaws — though site plan and building code requirements still apply.
Garden suites are different from laneway houses. A laneway house requires laneway access at the rear of the property. A garden suite can be built on any qualifying lot, with or without laneway access, as long as lot coverage, setback, and servicing requirements are met.
Garden suites do not require laneway access. They can be built on interior lots with standard rear-yard access, broadening the eligible property pool significantly.
The investment case
Why garden suites make financial sense.
A garden suite generates $1,500-$2,500+/month in rental income depending on location, size, and finishes. This income often covers a significant portion of the mortgage on the main property.
Adding a legal secondary unit increases the appraised value of the property. Depending on market, a $250k garden suite build can add $200k-$350k in property value — in addition to the rental income stream.
Building a garden suite on an existing property costs $150k-$350k — far less than purchasing a separate rental property. You get rental income without a second mortgage, second land cost, or second set of closing fees.
Costs & returns
Garden suite financial framework.
Typical cost ranges and return calculations for garden suite construction in Ontario. Actual numbers depend on location, size, finishes, and site conditions.
Construction Cost
$150k-$350k
Typical range for a 500-800 sq ft garden suite. Includes foundation, structure, mechanical, electrical, plumbing, and finishes. Site prep and servicing costs vary by lot.
Expected Monthly Rent
$1,500-$2,500
One-bedroom and two-bedroom garden suites in GTA and Hamilton markets. Higher rents in Toronto, lower in Hamilton and surrounding areas.
Annual Gross Yield
7-15%
Based on construction cost as the denominator. Net yield after property taxes, insurance, maintenance, and vacancy is typically 5-10%.
Zoning & permits
What you need to know about approvals.
While Bill 23 established as-of-right zoning for garden suites, you still need a building permit and must comply with the Ontario Building Code. Municipalities can impose site plan requirements — but they cannot refuse garden suites outright.
Key requirements vary by municipality but typically include: minimum lot size (often 450-600 sq m), rear and side yard setbacks (typically 1.2m minimum), maximum height (typically 1-2 storeys, up to 7m), maximum lot coverage (combined with main dwelling), and servicing capacity (water, sewer, hydro).
Some municipalities also require site plan approval, which adds 2-4 months to the timeline. Always verify local requirements before purchasing a property for garden suite development.
Most municipalities require 450-600 sq m minimum lot area. Narrow lots may not meet setback requirements even if total area qualifies.
Rear yard: typically 1.2m from property line. Side yard: typically 1.2m. These vary by municipality and can eliminate otherwise qualifying lots.
Most municipalities cap garden suites at 1-2 storeys or 7m maximum height. This limits the buildable square footage and impacts your rental income ceiling.
What to look for
Ideal properties for garden suite development.
Deeper lots (35m+ depth) provide more rear yard space for construction. Total lot area should exceed municipal minimums by a comfortable margin to accommodate setbacks and the suite footprint.
Wider lots make it easier to provide side-yard access for construction and future tenant entry. Minimum 12m frontage is ideal. Rear laneway access is a bonus but not required.
Proximity to municipal sewer and water connections. Flat or gently sloping rear yards reduce foundation costs. Avoid lots with mature trees in the build zone — removal adds cost and may require permits.
Deal sourcing
How we find garden suite properties.
Our scoring engine flags properties with garden suite potential by analyzing lot characteristics from MLS data. We look at lot size, lot depth, frontage, zoning designation, and access characteristics.
Properties that meet the baseline criteria get a garden suite potential score. High-scoring properties are surfaced to qualified investors with notes on estimated buildable area, municipal requirements, and preliminary feasibility.
This is not a guarantee of buildability — it is a shortlist of properties worth investigating further. Due diligence on servicing, grading, and municipal site plan requirements is still needed.
Lot area, depth, frontage, and zoning are scored against garden suite feasibility criteria. Only properties above threshold make the list.
Shortlisted properties include estimated buildable area, access notes, and flagged risks before you spend time on a site visit.
Qualification
Get access to garden suite properties.
We source properties with garden suite development potential across the GTA and Hamilton. Fill out the form to join the shortlist and get notified when qualifying properties are flagged.
Our engine scores lot characteristics so you can focus on properties that are actually buildable.