Mississauga Secondary Suite Guide
Create a legal basement apartment in Mississauga — permits, zoning, OBC requirements, and federal incentives up to $120,000.
Permit Fees
$2,800–$4,500
Timeline
3–4 months
Region
Peel (GTA)
Overview
Mississauga allows secondary suites in most residential zones (R-zones) without a variance. The city has streamlined permits and pre-approved drawings to speed up approval.
Typical project cost: $50,000–$120,000. Federal and provincial programs offer up to $120,000 in low-interest loans and grants.
Mississauga Requirements
| Requirement | Standard | Notes |
|---|---|---|
Ceiling Height | 1.95 m (6'5") minimum | OBC minimum applies. No Mississauga-specific variance. |
Fire Separation | 1-hour fire-rated ceiling + walls | Type X drywall, sealed penetrations, self-closing door to shared stairs. |
Egress Windows | 0.35 m² openable area per bedroom | Window well required if below grade. Must comply with OBC 9.9. |
Parking | 1 space required (reduced from 2 in 2023) | Mississauga requires 1 parking space per secondary suite. Driveway must be widened if needed. |
Electrical | Separate 100A panel + ESA permit | ESA inspection mandatory. Panel upgrade may be needed. |
Plumbing | Separate water meter + backwater valve | City may require drainage capacity study for older homes. |
HVAC | Independent heating OR thermostat per unit | HRV required if upgrading insulation beyond R-20. |
Zoning | Permitted in R1–R5 zones | Check zoning on GeoHub. Some older subdivisions may have restrictive covenants. |
Ontario Building Code Standards (Apply Everywhere)
These OBC requirements apply to all secondary suites in Ontario, regardless of municipality.
Fire Separation: 1-hour fire-rated ceiling assembly (Type X drywall)
Required between dwelling units. 2024 OBC update: smoke-tight barriers may replace full fire separations in some configurations. Inspected before occupancy permit.
Egress Windows: Min 0.35 m² openable area per bedroom
Bottom of opening max 1.5 m above floor. Must be rescuable from outside.
Electrical: Separate 100A panel minimum
ESA inspection mandatory. AFCI breakers required for bedrooms.
Plumbing: Separate water meter + backwater valve
Drainage must meet Part 7 standards. Backflow prevention required.
HVAC: Independent heating system OR zone control
Ventilation: min 10 L/s per occupant. HRV recommended.
Permit Process
Step-by-step guide to getting your Mississauga building permit
Total Timeline
3–4 months
Permit Fees
$2,800–$4,500
Zoning Confirmation
1 dayVerify your property is in an R-zone using Mississauga GeoHub. Most single-family homes qualify.
Permit Application
1 daySubmit drawings via online portal. Mississauga offers pre-approved templates for standard layouts.
Plan Review
3–6 weeksCity reviews for OBC and zoning compliance. Typical turnaround is faster than Toronto.
Permit Issuance
1 weekPay fees and receive building permit. ESA/plumbing permits filed by contractors.
Construction + Inspections
8–14 weeksCity inspects at framing, insulation, fire separation, and final stages.
Occupancy Permit
1–2 weeksFinal approval after all inspections pass. Suite is now legally rentable.
Incentives & Rebates
Federal and provincial programs that can help fund your secondary suite project. See all rebates available in Mississauga
Peel Region "My Home" Program
$20,000–$30,000 forgivable loan
Region of Peel forgivable loan for creating secondary suites. Must rent to income-qualified tenants for 15 years. Covers Mississauga and Brampton.
Canada Secondary Suite Loan
Up to $80,000 at 0% interest
Federal forgivable loan after 5 years. Stacks with Peel Region and provincial programs.
Ontario Secondary Suite Incentive
Up to $40,000 forgivable
Must rent at 80% of market rate for 5 years.
CMHC Insured Refinancing
Up to 90% of post-renovation value
Refinance up to $2M over 30 years at insured rates. Owner-occupied only.
Pro tip: You can stack federal and provincial programs for up to $120,000 in combined funding. Apply for federal programs first, then provincial.
Mississauga-Specific Tips
- Mississauga REQUIRES 1 parking space per secondary suite (unlike Toronto).
- Pre-approved drawings available from the city for standard layouts.
- Older subdivisions may have restrictive covenants banning rentals — check title.
- Drainage capacity study often required for homes built before 1990.
Official Resources
Secondary Suite Guides for Nearby Cities
Compare requirements and incentives in other Ontario municipalities.
Related Services
Common trades and services for basement apartment projects.
Complete Guide
Province-wide secondary suite guide with all requirements.
Learn moreUnderpinning
Excavate to lower floor and meet ceiling height requirements.
Learn moreWaterproofing
Fix moisture issues before finishing basement apartment.
Learn moreElectrical
Panel upgrades, separate meters, and ESA permits.
Learn morePlumbing
Drain capacity, backwater valves, and separate water meters.
Learn moreCommon Questions
Get a Quote for Your Mississauga Basement Apartment
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