BuildRules/Mississauga/Basement apartment / secondary suite/Cost

Mississauga, Ontario / Permit cost

What does a basement apartment / secondary suite permit cost?

See the published permit fee information BuildRules has verified for a basement apartment / secondary suite project in Mississauga, Ontario, with the source and limits visible.

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Focused project answerLast verified Oct 14, 2026
Published fee information

Mississauga Building By-law 0236-2024 Schedule B (2026) lists an $11.33/m² rate for an additional residential unit inside an existing building, plus the minimum residential fee ($244 for Part 9 projects). The City calculates the final upfront building-permit charge after reviewing the type and size of the proposed unit. Critically, Mississauga says eligible permits for building or legalizing an ARU are automatically refunded after construction and all required inspections are complete. Registration of a second unit is free. Other costs can remain, including drawings, renovations, fire inspections, some development charges for additions or garden suites, and a $81.90 + HST address fee for garden suites where applicable. Confirm rebate eligibility and all charges for your property with the City.

Use this as a municipal-fee reference, not as the total project budget. Design, engineering, related applications and construction costs are separate.

Scope before arithmetic

Make sure the fee belongs to your project.

Mississauga treats an additional residential unit as more than a basement finish. Conversion drawings, applicable-law information and registration are part of the route.

PermitBuilding permit route applies

Mississauga lists basement apartments among permit-required projects and publishes an ARU conversion submission checklist.

Conversion documentsDedicated checklist

The City requires project-specific forms and drawings when converting existing space into a second, third or fourth unit.

RegistrationRequired for second units

Mississauga states that second units must meet code and zoning requirements and be registered with the City.

Official sources behind this page

PermitBuilding permit route applies

Mississauga lists basement apartments among permit-required projects and publishes an ARU conversion submission checklist.

Official sourceCity of MississaugaWhen a building permit is required · Permit-required and permit-exempt project examples
Verified2026-10-13Open proof
Conversion documentsDedicated checklist

The City requires project-specific forms and drawings when converting existing space into a second, third or fourth unit.

Official sourceCity of MississaugaAdditional residential unit conversions · Second, third and fourth unit conversion documents
Verified2026-10-01Open proof
RegistrationRequired for second units

Mississauga states that second units must meet code and zoning requirements and be registered with the City.

Official sourceCity of MississaugaRegistering a second unit · Free registration of a second unit; proof of ownership, signed-off permit and registration form
Verified2026-10-14Open proof
2026 ARU permit charges$11.33/m² plus minimum residential fee

Schedule B (2026) lists $11.33 per m² for an additional residential unit within an existing building plus the minimum residential fee; the Part 9 residential minimum is $244. Final amount depends on the permit scope and area confirmed by the City.

Official sourceCity of Mississauga2026 Classes of Permits and Fees, Building By-law 0236-2024 Schedule B · Schedule B (PDF p. 1): Part 9 residential $244 minimum and Group C additional residential unit within an existing building $11.33/m² plus minimum residential fee
Verified2026-10-14Open proof
ARU building-permit fee rebateRefunded after final inspections

The City says eligible building permit fees are automatically refunded after an ARU is constructed or legalized and all required inspections are complete. Expect other design, construction and property-specific charges.

Official sourceCity of MississaugaAdditional residential units: permit fee rebate and 2026 requirements · Building permit fee rebate, permit fees and charges, refund after all inspections, review time, zoning limitations
Verified2026-10-14Open proof
Second-unit registrationFree

The City charges no fee to register a second unit, but requires proof of ownership, signed-off building-permit evidence and a completed registration form.

Official sourceCity of MississaugaRegistering a second unit · Free registration of a second unit; proof of ownership, signed-off permit and registration form
Verified2026-10-14Open proof

Need the full project answer?

The main guide keeps the permit trigger, zoning questions, documents, fees, timing and next steps together.

Open the basement apartment / secondary suite guide