What Is a Garden Suite?
A garden suite is a small, completely self-contained home in your backyard — built on your existing property, sharing your lot but nothing else. It has its own front door, kitchen, bathroom, and bedroom. It’s not an extension of your house. It’s a separate home that happens to be on your land. Also called a backyard suite, backyard home, coach house, granny pod, or the detached kind of in-law suite — the legal name in Ontario is a garden suite.
A garden suite is a small, fully self-contained home in your backyard, with its own entrance, kitchen, bathroom and bedroom, on your existing lot. It usually cannot be severed and sold on its own. Towns also call it an ARU, ADU, coach house or backyard suite, and most serviced Ontario lots can now have one without rezoning.
The Plain English Version
Picture your backyard. Now picture a small house there — 400 to 600 square feet, with everything a person needs to live comfortably and privately. A real kitchen. A real bathroom. A bedroom with a window that opens. Its own heating. Its own front door with its own lock.
That’s a garden suite. It’s also called a backyard suite, an Additional Residential Unit, an accessory dwelling unit, or an ARU. The name changes depending on who you ask. The thing itself doesn’t change. What “ADU” and “ARU” mean →
The garden suite is entirely separate from your house. Your tenant — or your aging parent, or your adult child — lives in their own space. They don’t share your hallway. They don’t hear your television. They don’t knock on your door to get in.
You still own the whole property. The garden suite is part of your land — it can’t be sold on its own, like a condo. But it can be rented out. It can house a family member. It can earn income every month while you continue living in your main house.
Since 2022, Ontario law allows most homeowners on serviced residential lots to build one without needing special planning approval, zoning changes, or permission from anyone beyond the building department. You apply for a building permit, build it, get your occupancy certificate, and rent it. That’s the whole process.
Street
Your Main House
You live here
Garden Suite
Tenant’s home
Typical size: 400–650 sq ft. One or two bedrooms. About the footprint of a two-car garage. Small enough to leave the rest of your yard intact, large enough to be a genuinely comfortable, private home. See layout types →
What a Garden Suite Is —
and What It Isn’t
The term gets used loosely. Here is what a legal garden suite in Ontario actually is and isn’t, so you’re comparing apples to apples when you research options.
A Garden Suite Is…
A fully self-contained dwelling unit
It has everything a person needs to live independently: kitchen with cooking facilities, full bathroom, sleeping area, and its own entrance. The occupant doesn’t need to enter your house for anything.
A detached structure in the rear yard
It’s physically separate from your main house — not attached to it. No shared walls, no shared hallway, no shared floor. It’s a separate building on your property.
Permanently part of your property
It’s built on a proper foundation and is part of your land permanently — not a temporary structure. It appears on your property assessment and adds to your property value.
Eligible for long-term rental income
You can rent it out to a tenant under a standard Ontario lease agreement, just like any other rental unit. Rents are yours to keep, subject to any forgivable loan conditions.
Permitted on most serviced Ontario lots since Bill 23
On lots connected to municipal water and sewer in a settlement area, Ontario law now allows up to three residential units as-of-right — including a garden suite as the third unit.
A Garden Suite Is Not…
A basement apartment
A basement apartment is inside your main house — below the ground floor, sharing the building. A garden suite is completely detached. The two are different structures with different OBC requirements, though both are legal second units. Compare the two →
A laneway suite
A laneway suite is a garden suite whose lot abuts a public rear lane — common in older Toronto neighbourhoods, essentially nonexistent in Simcoe County. If you’re in Barrie, Collingwood, or most of Simcoe County, you’re building a garden suite, full stop. What’s the difference →
A short-term rental unit
A garden suite built under the Additional Residential Unit framework is intended for long-term housing — not nightly or weekly STR rental. Many Simcoe County municipalities explicitly prohibit STR use on lots with ARUs. Rental income guide →
A separate property you can sell
A garden suite is tied to your lot — it cannot be severed and sold independently as a separate property. It stays part of your land permanently. If you sell the main house, the garden suite goes with it.
A bunkie, shed, or seasonal structure
A bunkie or seasonal cottage outbuilding is not a dwelling unit — it lacks full kitchen, bathroom, and habitation requirements. A garden suite is a year-round, fully compliant dwelling unit that meets the same building standards as your main house.
Who Builds a Garden Suite —
and Why
There is no single garden suite homeowner. The people building them in Simcoe County have different situations and different goals — but these are the three most common.
Rental Income — Offset the Mortgage
A garden suite in Barrie or Collingwood rents for $1,700–$2,100 per month for a one-bedroom unit. That’s roughly $20,000–$25,000 per year in gross rental income. For most Simcoe County homeowners, that’s a meaningful offset against the mortgage on the main house.
The Simcoe County forgivable loan ($50,000, with a Barrie bonus that can lift the local stack to $65,000) makes the project accessible even for homeowners without significant savings. Combine it with CMHC refinancing and many projects are cash-flow positive from the first tenant placement.
What does it rent for in your area →Housing an Aging Parent — Close But Independent
An aging parent who needs proximity but values independence. A garden suite solves the problem elegantly: close enough to help in minutes, separate enough that everyone has their own space and their own front door.
There is a meaningful tax credit available for homeowners who build a garden suite for a senior relative — the Multigenerational Home Renovation Tax Credit (MHRTC), worth up to $7,000 for 2026.
Aging parents and the tax credit →Long-Term Property Value — A Better Asset
A well-built, permitted garden suite adds meaningful value to your property — both in appraised value (a new structure with its own income stream) and in marketability when you eventually sell. In Simcoe County’s tight housing market, a turnkey income-producing unit on a property is a genuine differentiator.
For homeowners thinking about what their property will be worth in 10 or 20 years, building a quality garden suite now — particularly in ICF — is a long-term asset decision.
Cost and ROI breakdown →What Ontario Law Says —
Explained Without the Jargon
In November 2022, Ontario passed Bill 23 — the More Homes Built Faster Act. It changed the rules for what homeowners are allowed to build on their lots. Here is what it means in plain language.
Units now allowed on most serviced lots
Your main house plus a basement apartment plus a garden suite equals three total units. On serviced urban lots — connected to municipal water and sewer — this is now allowed as-of-right. No rezoning. No special permission. Just a building permit.
Development charges for the garden suite
Bill 23 exempted the second and third units on a residential lot from municipal development charges — a saving that used to run into the tens of thousands. The County of Simcoe levy may still apply, but the municipal DC is gone. Full DC guide →
Building permit — that’s all you need
On an eligible lot, you don’t need a rezoning, a Committee of Adjustment approval, or an official plan amendment. You need a building permit. Your municipality’s building department reviews the drawings and issues the permit. Build, inspect, occupy.
Maximum travel distance for fire access
The Ontario Building Code requires a 1.0m-wide, 2.1m-tall, all-weather path from the street to the garden suite entrance — with a maximum 45-metre travel distance. This fire access path is the most common physical constraint on real lots. Check your lot →
New garden suites are exempt from rent control
Any residential unit first occupied after November 15, 2018 is exempt from Ontario’s annual rent increase guideline. You set market rent at the start of each new tenancy, uncapped by the guideline. Rent control explained →
Rural lots work differently
If your property isn’t on municipal sewer — which covers most of Tiny Township, Oro-Medonte, Springwater, and rural Simcoe County — the Bill 23 as-of-right framework is different. Septic capacity is the first question. The rules still allow it; the process starts with the septic assessment. Rural septic guide →
The full picture: Bill 23 sets the provincial framework, but your municipality still controls setbacks, height limits, lot coverage maximums, and other site-specific rules. The provincial law says you’re allowed to build one; your municipality’s zoning bylaw says exactly where on the lot and how big. Both matter. The complete rules guide →
Garden Suites Across
Simcoe County — What’s Different Here
Simcoe County is a distinct market. The combination of rapidly growing communities, a significant rural population on private septic, strong rental demand from the healthcare and recreation sectors, and a genuinely helpful County funding program makes this region one of the most compelling places in Ontario to build a garden suite.
The County Forgivable Loan
The County of Simcoe runs one of the more generous garden suite funding programs in Ontario. If you’re planning to rent your suite at affordable rates and you live in it as your principal residence, the County may provide a forgivable loan of up to $50,000 — at zero interest, forgiven over 15 years. In Barrie, a municipal bonus can lift the combined local funding to up to $65,000.
This is not a rebate or a grant after the fact. It is a loan that reduces your capital requirement upfront, before construction begins. Combined with the CMHC insured refinancing program (which allows refinancing to up to 90% of post-renovation value), many Simcoe County homeowners can build a garden suite with limited out-of-pocket capital.
In Collingwood, a $10,000 local grant stacks with the $30,000 County loan, bringing total potential funding for a Collingwood project to around $40,000.
Complete financing guide →Municipalities We Build In
Garden suites are permitted across all of Simcoe County’s lower-tier municipalities. The rules, funding, and permit processes differ by municipality. Here are the communities we build in most often:
Not Sure If a Garden Suite Is Right for Your Property?
Start with a $399 + HST feasibility report. We look at your address, your zone, your rear yard dimensions, your side access path, and your servicing — and tell you honestly whether a garden suite is viable, what it would cost, and whether the numbers make sense for your situation. Delivered in writing within 48 hours, and the fee is credited toward your build if you proceed.
Know Before You Spend a Dollar —
The $399 + HST Feasibility Report
A written, property-specific answer researched by a licensed Ontario builder — not a sales call. Delivered within 48 hours. Here is exactly what you get:
- Zoning & setback check for your specific lot — with the bylaw sections cited
- Servicing & septic capacity assessment (the #1 rural deal-breaker)
- Site, equipment access & conservation-overlay review
- Realistic all-in budget and the funding your project qualifies for
- A clear GO / NO-GO verdict, in writing
- Your next three steps, in order