Basement Renovation in Mississauga, Ontario
MyAurora plans and builds finished basements and basement apartments for Mississauga homeowners, in detached homes, semis and townhouses. We handle the permit drawings, inspections and the City's additional residential unit requirements. Licensed and insured, WSIB-covered, with written quotes and clear timelines.
Basement during the framing stage with exposed beams, concrete floor and ductwork.
Mississauga basement rules at a glance
| Rule | Mississauga |
|---|---|
| Additional units allowed | Up to two additional units, or a fourplex |
| Building permit fees for ARUs | Waived when building or legalizing |
| Second and third units | Exempt from most municipal charges |
| Condo townhouses | Condo board approval also required |
| Basement apartment ceiling height (Ontario Building Code) | 1.95 m, 1.85 m under beams and ducts |
Basement renovation services in Mississauga
- Basement finishing for family rooms, home offices, gyms, playrooms and guest bedrooms.
- Legal basement apartments (additional residential units) built to the Ontario Building Code, with fire separation, interconnected smoke and CO alarms and proper egress.
- Basement bathrooms and kitchenettes, coordinated with permitted plumbing and drainage.
- Separate entrances and egress windows, planned with the permit drawings.
- Insulation, framing, drywall, flooring and lighting, with electrical by a licensed electrician under an ESA permit.
- Soundproofing between the basement and the main floor.
Basement renovation cost in Mississauga
| Project type | Typical cost (before HST) |
|---|---|
| Finished basement for your own use | $35,000 - $60,000 |
| Legal basement apartment (secondary unit) | $60,000 - $90,000+ |
The biggest cost drivers are size, whether you add a bathroom or kitchen, ceiling height, moisture or foundation repairs, a new side entrance or egress window, and upgrades to heating, ventilation and the electrical panel. Try our basement renovation calculator for a quick estimate, then book a site visit for a written quote.
Mississauga basement permits and legal suite rules
Finishing a basement with new rooms, a bathroom or a kitchen requires a building permit in Mississauga. If you own a detached, semi-detached or townhome, the City allows up to two additional residential units (ARUs), such as a basement apartment, or a fourplex. The City waives building permit fees for building or legalizing ARUs, and second and third units are exempt from most municipal charges.
Condo townhouse owners also need approval from their condominium board. After reviewing your permit application, the City may require a separate municipal address for the new unit. Older second units have their own registration process through the City.
Province-wide, the 2024 Ontario Building Code sets the minimum ceiling height for a secondary suite at 1.95 m (1.85 m under beams and ducts), and requires interconnected smoke alarms between units. For the full step-by-step, read our legal basement apartment guide.
Basements in Mississauga homes
Mississauga has a large stock of 1970s to 1990s homes, especially in Erin Mills, Meadowvale and Streetsville, where basements may have lower ceilings, older ductwork and dated electrical. Newer areas like Churchill Meadows often have better height and rough-ins. We check ceiling height, egress, moisture and the electrical panel first.
How we build your basement
- Site visit. We measure, check ceiling height, moisture, egress options and the electrical panel, and talk about how you will use the space.
- Written quote and design. You get a clear scope, price and timeline before anything starts.
- Drawings and permit. We prepare or coordinate permit drawings and apply for the building permit.
- Construction and inspections. Framing, plumbing, electrical, insulation and fire separation are inspected at each stage before we close the walls.
- Finishes and handover. Drywall, flooring, trim, paint and fixtures, a final walkthrough and the final inspection.
Neighbourhoods we serve in Mississauga
We work across Mississauga, including:
- Churchill Meadows
- Meadowvale
- Lisgar
- Streetsville
- Erin Mills
- Erindale
- Clarkson
- Lorne Park
- Port Credit
- Cooksville
- Mississauga Valleys
- Central Erin Mills
Real Google Reviews from MyAurora Clients
MyAurora is rated 5.0 from 20 Google reviews, mostly from fencing and repair clients in Milton and Mississauga. Same owner-led team, clear written quotes and clean job sites on every project.
"MyAurora Inc. saved the day after a so-called professional botched my drywall. Jas was very patient, cut out and replaced the drywall and plastered it so nicely."
Abbie A. - Drywall repair
"Very professional job! The guys were quick, very accurate and most importantly know how to stay within the quote budget."
Asror A. - Google review
"He took the time to meet with the neighbors and answer ALL our questions. He was patient with all of us and was keen on walking us through the project."
Andrew M. - Fence project
"The quality and workmanship were excellent, and everything was completed professionally and on time."
Aaron R. - Fence project
Get a free basement quote in Mississauga
Tell us your address, how you want to use the basement and send a few photos. We reply with next steps and book a site visit.
Call or WhatsApp 437-985-2935 Estimate with the calculatorEmail: info@myauroras.com
Basement renovation FAQ for Mississauga
Can I add a basement apartment in Mississauga?
If you own a detached, semi-detached or townhome, Mississauga allows up to two additional residential units, such as a basement apartment, or a fourplex, subject to zoning and a building permit.
Are building permit fees waived for basement apartments in Mississauga?
Yes. The City of Mississauga waives building permit fees for building or legalizing additional residential units, and second and third units are exempt from most municipal charges.
Do condo townhouse owners need approval for a basement unit in Mississauga?
Yes. Condo townhouse owners need approval from their condominium board, in addition to zoning and permit requirements.
How much does a basement renovation cost in Mississauga?
A finished basement for your own use typically costs $35,000 to $60,000 before HST, and a legal basement apartment conversion typically costs $60,000 to $90,000 or more. Older homes with low ceilings or dated electrical can cost more.
What ceiling height do I need for a basement apartment?
Under the 2024 Ontario Building Code, a secondary suite can have a ceiling height of 1.95 m, with at least 1.85 m clear under beams and ducts.
Will my basement apartment need its own address in Mississauga?
It may. The City tells you whether the new unit needs a separate municipal address after it reviews your building permit application.
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Permit and by-law details are summarized from Town of Milton, Town of Oakville, City of Mississauga and Ontario Building Code sources and can change. Confirm current rules for your property before building. Prices are typical ranges and not a quote.