If you’re a homeowner in Mississauga and you’ve thought about creating a second unit—maybe in your basement, above your garage, or somewhere else in your home—you’re not alone. Adding a second dwelling unit is one of the smartest ways to increase your property value, generate extra rental income, or simply create more space for family.
But here’s the catch: in Mississauga, a second unit isn’t legal just because it exists. You’ll need to follow strict rules around building codes, fire safety, zoning, and permits. It is highly recommend to hire an experienced and reliable renovation company to help you navigate all the rules and regulations for your second unit.
What Is a Second Dwelling Unit, Exactly?
A second dwelling unit—also called a second unit or accessory dwelling unit (ADU)—is a private living space within your home. It must include:
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A kitchen
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A bathroom
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A place to sleep
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A separate entrance (in most cases)
In Mississauga, these units are common in basements, but they can also be on upper floors, in additions, or converted spaces like garages.
Why More Mississauga Homeowners Are Creating Second Units
There are a few key reasons why second units are growing in popularity across the city:
1. Rental Income
With rising housing costs, many homeowners see second units as a smart way to earn steady monthly income. Once legalized, these units can be rented out long-term.
2. Support for Family
A second dwelling unit can become a comfortable space for aging parents, young adults, or extended family—offering privacy and independence without leaving home.
3. Increase in Property Value
Adding a legal second unit doesn’t just help you today—it can boost your resale value when it’s time to sell. Buyers love the option of a rental-ready space.
What Makes a Second Unit Legal in Mississauga?
To be recognized as a legal second dwelling unit in Mississauga, your space needs to meet several key requirements:
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A building permit must be issued before construction or renovation
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The unit must comply with the Ontario Building Code
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Fire safety rules (like fire-rated drywall and smoke alarms) must be followed
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The space must meet local zoning bylaws
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After passing inspections, the unit must be registered with the City
If you already have an existing unit, you may still need to upgrade it to meet code. That’s where many homeowners find the process overwhelming—and why working with a professional contractor is so important.
How Acme General Contractors Helps Homeowners in Mississauga
At Acme General Contractors, we specialize in helping Mississauga homeowners build, upgrade, and legalize second units with confidence. Our team handles the entire process:
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Reviewing your space and providing options
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Preparing architectural drawings and applying for permits
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Completing all required construction, plumbing, and electrical work
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Ensuring the space meets fire and building code
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Scheduling inspections and registering your second unit
Whether you’re starting fresh or fixing up an existing unit, we’ll guide you every step of the way.
Things to Consider Before You Build a Second Dwelling
Before you start planning, here are a few important things to keep in mind:
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Zoning Rules: Not all homes in Mississauga are eligible for a second unit. We’ll help you check.
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Parking Requirements: In many cases, you’ll need one extra parking space.
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Permit Timeline: Getting city approvals can take time, but we know how to fast-track the process.
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Budgeting: Costs vary based on the size and scope of work, but second units usually pay for themselves quickly with rental income.
Ready to Explore Your Options?
If you’re considering building or legalizing a second dwelling unit in Mississauga, reach out to Acme General Contractors. We offer free consultations, high quality work, and decades of experience helping homeowners just like you.
📞 Call us at 4379257105
📩 Email: service@acmegc.ca
We’ll walk you through the process, answer your questions, and help you get started as soon as possible.
