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Toronto multiplex permits

Do you need a permit to convert a Toronto house into a multiplex?

Toronto multiplex permit guide for converting a house to a duplex, triplex, fourplex, fiveplex or sixplex, with drawings, related permits and City sources.

2 min readReviewed Oct 1, 2026
The short answerPermit likely required

Yes. Toronto has a building-permit route for converting an existing house to a duplex, triplex, fourplex, fiveplex or sixplex.

The permit package can include architectural drawings, structural details, mechanical and plumbing information, and additional forms when an addition or rental renovation is involved.

Make this useful for my project

Check the actual address

What does the City map show for yours?

Pair this guide with mapped zoning, visible sources and the checks your design still needs.

Check my property

Know what matters

What changes the answer.

Start with these conditions. The official reference is attached to each one.

Building permitRequiredConditional

Toronto's Multiplex Conversion guide is specifically for a building permit to convert an existing house to two through six units.

Official sourceCity of TorontoMultiplex Conversion · Permit route, submission documents, related permits and 2026 fees
Verified2026-10-01Open proof
Mechanical / plumbingMay require related permitsConditional

HVAC, plumbing and drain work can require related permit submissions.

Official sourceCity of TorontoMultiplex Conversion · Permit route, submission documents, related permits and 2026 fees
Verified2026-10-01Open proof
ZoningVerify the propertyInfo

The proposed conversion still has to comply with applicable zoning and other law.

Official sourceCity of TorontoZoning By-law 569-2013 · Office consolidation with City-wide amendments through April 30, 2026
Verified2026-09-29Open proof

Your preparation checklist

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Preparation checklist · Reviewed 2026-10-01

Fees and timing

TimelineTiming depends on completeness, structural scope and whether additional zoning or applicable-law review is needed.
FeesToronto lists 2026 interior-alteration, new-unit and addition rates; the applicable combination depends on the proposed work.

Next steps

  1. Confirm the proposed number of units
  2. Document existing conditions
  3. Check zoning and fire/life-safety constraints
  4. Coordinate building, HVAC and plumbing submissions

A few questions you might have.

Can a Toronto house be converted to a sixplex?

Toronto's multiplex conversion guide covers conversions to duplexes through sixplexes, subject to the applicable rules and permit review.

Do plumbing and HVAC need separate review?

They can. The City guide identifies related mechanical, plumbing and drain requirements when those systems are part of the project.

Better decisions, together

Get everyone on the same page.

Send this to your designer or contractor before agreeing on the scope.

Keep exploring

Your next useful question.

A connected project guide or a practical next step, picked for this topic.

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Application planning

How do you prepare a Toronto building permit application?

Define the actual work, check the applicable rules, choose the City guide for that scope and prepare its drawings, forms and fees. The submission route is stated in the project-specific guide.

4 min read
Costs & budgeting

What will your Toronto building permit cost?

The fee depends on the work category. In Toronto’s 2026 schedule, a residential deck permit is $214.79; selected area- and length-based categories use a rate and minimum. Use the calculator for one category, then build the rest of your project budget separately.

4 min read