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 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?
In the neighbourhood that 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)
Every property is different, but most garden suites / detached additional units must follow key rules such as:
- Location – Detached units must sit in the rear yard as an accessory building to a detached, semi‑detached, linked, or townhouse dwelling.
- Number of units – On many detached lots, City now permits up to three additional dwelling units in total, typically as a combination of attached and one detached unit.
- Size & height – Typical maximum building size is around 100 m² (approx. 1,076 sq ft) with a height limit of about 6 m, which generally keeps most suites to 1–1.5 storeys with potential loft space.
- Setbacks – Minimum setbacks often include approx. 0.6 m from rear lot line and 0.9 m from interior side lot lines, with deeper setbacks on corner lots and from flankage streets.
- Lot coverage & eligibility – Combined lot coverage (main house plus all accessory buildings) is capped, commonly around 40% of the lot, and some character/heritage areas have tighter limits.
- Parking & access – One parking space is usually required for the principal dwelling; some configurations don’t require extra spaces, but safe pedestrian access to the suite must be maintained.
- Code & services – Units must meet the Ontario Building Code for self‑contained dwellings (life safety, fire separation, egress, ceiling heights) and be serviced with municipal water and sewer.
These rules change over time and vary lot‑by‑lot. Golden Brick Homes works with you, your survey, and town staff to confirm exactly what is possible on your property.
(Note: This overview is informational only and not legal advice. All projects are designed and permitted to current Town of Oakville and Ontario Building Code standards.)
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
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.