What Is a Garden Suite or Additional Residential Unit?
A garden suite (also called a coach house, backyard suite, or detached additional dwelling unit) is a small, self‑contained home in a separate building on the same lot as your main house. It has its own kitchen, bathroom, living area, and sleeping space, and is typically located in the rear yard as an accessory building.
Under Ontario’s updated planning framework and Oakville’s and Burlington’s zoning by‑laws, these units are treated as Additional Residential Units (ARUs) or Detached Additional Dwelling Units, and are now permitted on many low‑rise residential lots, subject to local rules on size, height, setbacks, and services.
Why Homeowners Are Adding Garden Suites
Oakville, like Burlington, has embraced “gentle density,” allowing multiple units on a single lot when they meet zoning and Building Code requirements. In many residential zones, you can now combine attached and detached additional units — for example, a basement suite plus a detached backyard suite — up to a maximum of three additional dwelling units on one property, depending on dwelling type.
That opens up powerful options:
- Multi‑generational living – Create a private, fully independent home for parents, adult children, or extended family, on the same property.
- Rental income – Add a high‑quality, legal rental unit to offset your mortgage or increase long‑term cash flow.
- Future flexibility – Use the space today as an office, studio, or guest suite, and convert to a rental or family unit later.
- Property value – Well‑designed, code‑compliant additional units can significantly increase resale appeal in a supply‑constrained market.
Golden Brick Homes helps you do this legally, with full attention to zoning, life‑safety, and long‑term value.
What You Need to Know (At a Glance)
Zoning details reviewed and current as of August 2026 (Town of Oakville Zoning By-law 2014-014, as amended by By-law 2024-053). Rules vary by zone and lot — we confirm yours before design.
Every property is different, but here are the rules that govern most garden suites and detached additional residential units (ARUs) in Oakville today:
- Number of units — Most lots with a detached, semi-detached or townhouse home can now have up to 4 dwelling units in total: your main home plus up to 3 additional residential units. Only one may be a detached garden suite (e.g., 2 basement/attached suites + 1 garden suite), per Town of Oakville By-law 2024-053.
- Location — A detached ARU sits in the rear yard as an accessory building to the main home.
- Height — Maximum 4.0 m for a detached ARU in most residential zones, which suits a well-designed single-storey suite (lofted ceilings are possible with smart roof design).
- Size — The greater of 42 m² (~450 sq ft) or 5% of your lot area — larger lots earn a larger suite.
- Setbacks — 0.6 m minimum from side and rear lot lines; corner and flankage lots have deeper requirements.
- Parking — One parking space covers your first two units, and no additional space is required for a third unit. Several transit-served areas have further relaxations.
- Permits — A building permit is always required, and the unit must meet the Ontario Building Code with proper water, sanitary and hydro connections. We confirm the exact zone standards for your parcel with Town of Oakville Planning Services before design begins — included in every Golden Brick garden suite project.
Rules current as of July 2026. Standards vary by zone and lot — always confirm for your specific property.
We offer a turnkey, builder‑led approach:
01.
Feasibility & Zoning Review
Review zoning, heritage, and conservation constraints
Identify the best location and realistic size/height options for your suite
02.
Concept Design & Budgeting
Provide preliminary budget ranges and ROI considerations
Refine plans to balance function, aesthetics, and cost
03.
Detailed Design & Permits
Prepare and submit building permit and any necessary minor variance applications
Address Town comments and conditions until permits are approved
04.
Construction & Project Management
Install mechanical, electrical, and plumbing systems to current code
Finish interiors with durable, attractive materials suitable for daily living or rental
05.
Handover, Inspection & Support
Walk you through all systems and maintenance basics
Provide documentation for rental, refinancing, or resale
Typical Uses for Garden Suites & ARUs
- Private in‑law suite or aging‑in‑place residence
- Independent space for adult children or boomerang kids
- Short‑ or long‑term rental for additional cash flow
- Dedicated home office, studio, or practice with its own entrance
- Future‑proofed flexibility if your family’s needs change
Garden Suite FAQs
How long does a garden suite permit take in Oakville?
Plan for roughly 2 to 4 months from first design meeting to permit in hand: about 4-8 weeks for design, drawings and zoning review, then typically 2-6 weeks for the Town of Oakville to review a complete, code-compliant building permit application. A compliant application moves fastest — revisions and zoning relief add time.
How much does a garden suite cost in Oakville?
Most turnkey garden suites in Oakville land between $250,000 and $450,000+ depending on size, finishes, site servicing (water, sanitary, hydro runs) and foundation conditions. Smaller studio-scale suites can come in lower; larger or high-spec suites cost more.
What are the size and height limits for a garden suite in Oakville?
In most Oakville residential zones a detached additional residential unit can be up to 4.0 m tall with a floor area up to the greater of 42 square metres or 5% of the lot area, set back at least 0.6 m from side and rear lot lines. Most lots with a detached, semi-detached or townhouse home may have up to 4 dwelling units in total (main home plus up to 3 additional units, only one of them detached). Standards vary by zone, so we confirm your exact parcel with Town of Oakville Planning Services.
Can I rent out a garden suite in Oakville?
Yes. A legal, permitted garden suite can be rented as a long-term rental home, making it a genuine income-generating asset. Short-term rentals (under 28 days) are restricted under Oakville’s licensing rules, which generally limit short-term accommodation to a host’s principal residence. Many owners use suites for family first, rental income later.
Where Do You Want to Start?
A garden suite starts with one question: what does your lot actually allow? Every path below begins with a free, no-obligation answer.
- Check what my backyard allows. — A free feasibility chat: zoning, setbacks, servicing and whether your lot supports a detached suite.
- See what my property is worth with a suite. — A builder-informed valuation, including how an added unit affects value and rental income.
- I’m building new and want a suite from day one. — Designing the main home and the suite together is cheaper than adding one later.
Questions first? Call (647) 772-1642 or start here.
Want to go deeper on the rules and numbers? Read our guides: Garden Suites in Oakville — 2026 Rules, Costs & Permits and Building a Garden Suite in Oakville, Burlington & Mississauga.
Ready to Explore a Garden Suite or Additional Residential Unit?
Whether you’re planning multi-generational living, house-hacking, or simply future-proofing your property, Golden Brick Homes can help you design, permit, and build a legal, high-quality additional unit in Oakville and Burlington.