Garden Suites in Ontario: How the Secondary Suite Loan Program Can Help You Build One in 2026

Chris Rouse
Mar 28
6 min read

Garden suites are moving from niche idea to mainstream solution in Ontario’s housing conversation. For homeowners, they can provide multigenerational space or stable rental income. For cities, they are a practical way to add “gentle density” without changing the character of existing neighbourhoods.

With the federal Secondary Suite Loan Program coming online, it is now easier for Canadian homeowners to finance a legal garden suite or other secondary unit on their property. This guide explains how garden suites work, what the loan program offers, and what you should know before starting a project in Oakville, Hamilton, or the broader GTA.

What Is a Garden Suite?

A garden suite is a self contained dwelling located in the rear yard of a lot that already has a primary home. It has its own kitchen, bathroom, sleeping area and entrance and is designed for year round living.

In Ontario planning language, garden suites fall under the broader umbrella of “additional dwelling units” or accessory dwelling units (ADUs), which also includes basement apartments and laneway suites. Many municipalities now allow two or three units on a residential lot because of provincial housing legislation such as the More Homes Built Faster Act and related policy changes. Typical uses include long term rental units to offset mortgage costs, private residences for adult children or aging parents, and flexible space that can change use as family needs evolve.

Why Garden Suites Matter for Canada’s Housing Supply

Canada faces a significant housing shortage. Federal briefing material from the Minister of Housing, Infrastructure and Communities notes that millions of additional homes are needed by 2030 to restore affordability. Building enough high rise and greenfield projects to close that gap will take time and major infrastructure investment.

Garden suites offer a complementary path. They add units on land that is already serviced with roads, sewers and transit, which research on accessory dwelling units identifies as a way to improve the cost effectiveness of existing infrastructure. They can be delivered faster than large projects because they involve one lot and a single owner, and they support more diverse housing options for singles, couples and small families in established neighbourhoods. Studies of ADUs find that they can improve affordability, give homeowners extra income and make more efficient use of existing land.

Overview of the Secondary Suite Loan Program

To accelerate projects like garden suites, the federal government announced the Canada Secondary Suite Loan Program in late 2024. The Department of Finance describes this in its Fall Economic Statement. News coverage and federal communications explain that the program:

Provides loan amounts up to about 80,000 dollars for qualifying homeowners who create a new secondary suite, such as a basement apartment, garden suite, laneway suite or garage conversion.
Offers a preferential interest rate, commonly cited around 2 percent, with repayment terms up to 15 years.
Works alongside enhanced refinancing rules that allow insured borrowers to refinance up to 90 percent of the post renovation value of the property with amortizations up to 30 years.

Loans must be used to build or upgrade a self contained unit that meets local bylaws, the building code and long term rental criteria, not for short term rentals. The program’s goal is to make it financially feasible for more homeowners to add safe, legal secondary suites that increase housing supply and create gentle density in existing communities.

Eligibility Basics for a Garden Suite

Details vary by lender, but based on federal and national mortgage guidance, a garden suite funded through the Secondary Suite Loan Program will typically need to:

Be a fully self contained dwelling with its own kitchen, bathroom and sleeping area.
Have a separate entrance and be suitable for full time, year round occupancy.
Comply with local zoning, garden suite bylaws and the Ontario Building Code.
Be rented on a long term basis, often at least 90 consecutive days, rather than as a short term rental.

Homeowners will be expected to provide drawings, permits and construction contracts that demonstrate compliance. Because the loan is tied to a specific project, working with a contractor who understands local bylaws and code requirements is critical.

Key Garden Suite Rules in the GTA

Each municipality sets its own detailed rules for garden suites within the provincial framework. A few examples show the types of standards you should expect.

Toronto

Toronto zoning and bylaw documents outline requirements such as:

A minimum fire access path from the street to the suite, usually 1.0 metre wide with a maximum 45 metre travel distance, or a slightly narrower path if the suite is sprinklered.
Height limits linked to separation from the main house, typically around 4.0 metres at 5.0 metres separation and up to about 6.0 metres at 7.5 metres separation.
A maximum ground floor area that is the lesser of 60 square metres or 40 percent of the rear yard, and limits on total ancillary building coverage as a share of the lot.
Recent amendments clarify that garden suites must remain clearly secondary to the main dwelling in size and must respect setbacks, height and tree protection requirements.

Other GTA Cities

Many GTA municipalities, including Hamilton and Oakville, now allow additional dwelling units in detached, semi detached and townhouse properties. Regional zoning summaries note that:

Garden suites must sit behind the main house and maintain minimum rear and side yard setbacks.
Combined lot coverage of the main house and garden suite often cannot exceed about 40 percent of the lot.
At least one on site parking space is usually required for the principal dwelling, with flexible rules for the garden suite.

Because specific numbers change, homeowners should always confirm standards with local planning and building departments before finalizing a design.

Costs, Returns and Financing a Garden Suite

A well built garden suite in Southern Ontario is similar in complexity to a small custom home. Costs are driven by factors such as size and layout, level of finishes, site conditions and servicing distances, and municipal fees and engineering requirements.

In exchange, owners typically gain:

A new long term rental stream that can help offset mortgage or retirement costs.
Flexibility to house family members in a private but nearby unit.
Increased resale value due to the extra legal unit, especially in markets where investors value multi unit properties.

When the Secondary Suite Loan Program is layered on top of existing tools such as mortgage refinancing and provincial changes that reduce or remove development charges for many additional dwelling units, the upfront cost barrier can drop significantly.

Risks of Illegal or DIY Units

It can be tempting to add a backyard unit or basement apartment without permits to save money. However, Imperio’s article “The Danger of Having an Illegal Rental Unit in Your Home” outlines serious risks. These include:

Violations of zoning and building code rules, including fire separation, exits and electrical safety.
Insurance problems if a claim is linked to unapproved construction.
Price reductions or failed sales when illegal work is discovered.
Municipal enforcement that can require expensive remediation or removal of non compliant units.

For homeowners considering a garden suite, the safest strategy is to plan a fully legal, permitted project from day one and use available loan programs to make that feasible.

How a Design Build Contractor Helps

A garden suite is essentially a small custom home tucked into a backyard. There are design decisions, engineering considerations, zoning constraints and construction sequencing to manage on a tight urban site.

An engineering led design build firm like Imperio:

Reviews zoning and local garden suite rules to confirm what is possible on your lot.
Coordinates architectural design, structural engineering and code compliance.
Manages permit submissions, inspections and any required heritage or tree permits.
Aligns scope and budget so you can integrate the Secondary Suite Loan Program, refinancing and other incentives into a clear financial plan.

The result is a garden suite that not only looks good on paper, but also functions well for everyday living and passes every required inspection.

Is a Garden Suite Right For You?

A garden suite is not the right solution for every property or every family. You need enough rear yard space, appropriate zoning and comfort with the responsibilities of being a landlord or hosting family nearby.

However, for many homeowners in Oakville, Hamilton and the broader GTA, a garden suite funded in part through the Secondary Suite Loan Program is one of the most powerful ways to support family members with independent living, create new long term rental income and contribute directly to easing Canada’s housing shortage.

If you are curious whether your lot can accommodate a garden suite, or how the Secondary Suite Loan Program might fit into your financing, the most effective next step is a structured consultation with a design build contractor like Imperio who understands both the construction and the funding landscape.

Want to learn more about Garden Suites? Check out some of our additional resources below: