Ontario Design Studio provides BCIN-certified building permit drawings for projects in Mississauga. From residential additions to legal basement apartments and commercial fit-outs, we prepare OBC-compliant drawings tailored to the City of Mississauga's building department requirements and Peel Region regulations.
Mississauga Permit Services
- Residential permits - new homes, additions, renovations
- Legal basement apartments in Mississauga - second unit registration and permit drawings
- Commercial permits - retail, restaurant, office fit-outs
- Secondary suites and garden suites
- Deck permits
- Multiplex conversions
Mississauga-Specific Requirements
- Second Unit Registration: Mississauga requires registration of second units (basement apartments) with the city, in addition to the building permit
- Peel Region Services: Projects involving water and sewer connections may require coordination with Peel Region
- Heritage Properties: Properties in Mississauga heritage conservation districts need additional review
How the Mississauga Building Permit Process Works
Mississauga requires all building permit applications to be submitted online through the City's ePlans portal - there are no paper submissions. A complete application includes a site plan from a legal survey, existing and proposed floor plans, elevations, sections, structural details, and energy compliance documents, prepared to Ontario Building Code standards.
- Zoning check: we confirm setbacks, lot coverage, height, and parking against Mississauga's zoning by-law before design begins.
- Drawing preparation: our BCIN-certified team prepares the complete ePlans-formatted package (typically 5–10 business days).
- ePlans submission: we create and manage the application, upload drawings in the City's required format, and respond to examiner comments.
- Inspections & registration: after construction, City inspections sign off - and for second units, we guide you through the final registration step.
Mississauga ARUs: Permit Fees Refunded
Mississauga is actively encouraging additional residential units. If you own a detached, semi-detached, or townhouse home, you can build up to two ARUs - inside the home (like a basement apartment) or as a detached garden suite. Two financial advantages worth knowing, per the City's ARU program:
- Building permit fees are refunded when you build or legalize an ARU
- Second and third ARUs are exempt from most municipal charges
After inspections pass, second units are registered by emailing proof of ownership and the inspector-signed permit to the City's second-unit registry - a step we walk every client through, because an unregistered unit isn't a legal unit.
Ready to start your project?
Ontario Design Studio delivers BCIN-certified, OBC-compliant building permit drawings across Ontario and the GTA. Call 416-558-9607 or request your free quote.
Frequently Asked Questions
How long does a building permit take in Mississauga?
The City of Mississauga typically reviews residential permit applications in 10–15 business days and commercial applications in 20–30 business days. Complex projects or applications with deficiencies may take longer.
Can I build a second unit (basement apartment) in Mississauga?
Yes. Mississauga's zoning bylaw permits second units (basement apartments) in most residential zones. Key requirements include minimum ceiling height, fire separation, egress windows, and separate entrance access. See our dedicated Mississauga basement apartment page for details.
Are Mississauga permit fees really refunded for ARUs?
Yes - the City refunds building permit fees when you build or legalize an additional residential unit, and second and third ARUs are exempt from most municipal charges. It's one of the GTA's most homeowner-friendly ARU policies.
How do I register my second unit in Mississauga?
After your permit work passes all inspections, registration is completed by emailing proof of ownership and the inspector-signed permit documentation to the City's second-unit registry. We guide every basement apartment client through this final step.
Can I submit a paper permit application in Mississauga?
No - Mississauga accepts applications only through its online ePlans portal. We handle the entire electronic submission for you, including drawing formats and examiner responses.
Helpful Resources
- Legal Basement Apartments in Mississauga
- Legal Basement Apartment Requirements Ontario (2026)
- Permit Rejected? We Fix and Resubmit
Mississauga Neighbourhoods We Serve
Port Credit, Streetsville, Cooksville, Meadowvale, Erin Mills, Clarkson, Lorne Park, Mineola, Lakeview, Malton, Mississauga Valley, and all other areas within Mississauga.