Multiplex Conversion Toronto: What to Know in 2026

Written by AgileBuilds Ltd. - Sept 2026

Introduction

Toronto's housing market has made one thing clear: single-family homes sitting on underused lots are leaving money on the table. For homeowners and investors across the GTA, multiplex conversion is one of the most effective strategies to increase rental income, build long-term equity, and respond to a city that is actively encouraging more housing density.

If you've been considering a multiplex conversion in Toronto, this guide covers what you need to know before you start zoning, permits, costs, and what it actually takes to do it right.

What Is a Multiplex Conversion?

A multiplex is a residential building containing multiple self-contained dwelling units within a single structure. In the context of conversion, this typically means taking an existing detached, semi-detached, or row house and redesigning the interior and sometimes the exterior to create multiple legal units, each with its own entrance, kitchen, bathroom, and living space.

Conversions range from a duplex, two separate units, up to a triplex or fourplex, depending on your property's size, structure, and zoning classification.

Toronto's Zoning Changes and What They Mean for You

Toronto has been expanding permissions for residential intensification in recent years. In 2023, the City of Toronto adopted zoning amendments enabling multiplex housing citywide, allowing up to four units on most residential lots, including areas previously limited to single-family homes.

Permissions vary by geography. The citywide as-of-right permission is four units. Six units are currently permitted in two specific areas: Toronto and East York District (adopted by City Council June 25–26, 2025) and Ward 23 Scarborough North (adopted February 5, 2025). The City is currently undertaking a study to expand six-unit permissions city-wide, but that policy has not yet been adopted. If your property is in Toronto and East York or Ward 23, your options may be broader. Confirm at toronto.ca/multiplex or with a contractor familiar with current permissions before assuming any unit count applies to your lot.

As of November 20, 2024, Ontario Regulation 462/24 came into force, which has additional zoning impacts for duplexes and triplexes. The City's Multiplex Monitoring Team is currently reviewing the effects of this regulation.

These permissions are as-of-right within the applicable zoning framework, meaning a rezoning application or Committee of Adjustment hearing is generally not required solely to add units where zoning standards are met. That said, your property still needs to meet all applicable zoning standards, and a building permit is required before any work begins.

Permits and Approvals Required

A multiplex conversion in Toronto requires a building permit from the City of Toronto before any structural or major renovation work begins. Depending on the scope of your conversion, additional permits and compliance requirements may include:

• Electrical work - Electrical work in Ontario is regulated through the Electrical Safety Authority (ESA). Depending on the scope of your project, notification or permits through ESA may be required. Confirm current requirements at esasafe.com.

• Plumbing and mechanical work - Work involving new or relocated plumbing and HVAC systems is typically captured under Toronto's building permit process. Confirm the current scope with the City or your contractor before starting.

• Fire separation compliance - Each unit must meet Ontario Building Code fire separation requirements between dwelling units.

The permit process in Toronto takes time. Building it into your project timeline from day one, not as an afterthought, is one of the most important decisions you can make before a shovel goes in the ground.

What's the Rental Income Potential?

Toronto's rental market consistently ranks among the most competitive in Canada. A legally converted multiplex allows you to generate income from two, three, or four units on a single lot simultaneously, offsetting carrying costs or building rental income as an investor.

For current average rental rates by unit type in Toronto, refer to the most recent CMHC Rental Market Report or TRREB Rental Market Report. We have not included specific dollar figures in this post because rental rates change, and publishing an outdated number does more harm than good.

What the data consistently shows is that legal, permitted units in Toronto command significantly stronger rental rates and face lower vacancy risk than non-compliant units in part because tenants increasingly understand the difference, and in part because legal units can be properly listed, insured, and protected under the Residential Tenancies Act.

Why the Execution Matters as Much as the Permit

A legal multiplex conversion is a construction project with regulatory compliance requirements that affect your property's legal status, insurance, and resale value. Working with a contractor who understands the permit process and builds to code is not optional; it's the difference between a conversion that performs and one that creates liability.

At AgileBuilds Ltd., we specialize in legal multiplex conversions across the GTA. We manage the full process from permit application through final inspection, so every unit we deliver is legal, compliant, and ready to generate income. Our team has completed conversions across Toronto, North York, Scarborough, Pickering, and Whitby, and we understand the permit requirements and construction standards these projects demand.

Ready to Convert Your Property?

If you're thinking about a multiplex conversion in Toronto, the first step is understanding what your property can realistically support in terms of zoning, structure, and budget.

Contact AgileBuilds Ltd. today to discuss your property and what a conversion could look like.

📞 647-930-7797

📧 [email protected]

🌐 www.agilebuilds.ca

Related Renovation & Construction Articles

Browse practical articles from Agile Builds covering renovation planning, construction timelines, design decisions, permits, budgeting, additions, laneway homes, and multi-unit conversion projects across Toronto and the GTA.

Legal Basement Suite vs. Illegal Apartment: What Every Toronto Homeowner Needs to Know

Not all basement apartments in Toronto are legal. Learn the difference, what's at risk with an illegal unit, and how to protect your property and your tenants.

Do I Need a Permit for a Legal Basement Apartment in Toronto?

Thinking of adding a legal basement apartment in Toronto? Learn what permits you need, inspection stages, timelines, and how to stay fully compliant.

Read More

Our General Contractor Process

We make it easy to get a reliable contractor for your project

Step 1

Request a Quote

Tell us about your property and multi-unit project goals by filling out our form.

Step 2

Schedule Your Service

Choose a time that works best and our team confirms the details.

Step 3

Construction Begins

Our experienced professionals handle your project efficiently.

Trusted By Homeowners & Real Estate Investors

Reviews from Greater Toronto Area clients who love our services and results.

We had a great experience working with AgileBuilds to finish and legalize our basement. The team was wonderful to work with throughout the entire process and always took the time to address any issues or questions that came up along the way. They really brought our vision to life and made the basement exactly how we wanted it. We’re extremely happy with how everything turned out.

Gloria & David

Homeowner

We hired AgileBuilds for a full multiplex conversion of our 160-year-old Toronto home and were very happy with the experience and final result. We were quite nervous taking on a renovation of this scale, especially with such an old house, but throughout the process we felt very well taken care of by Steven and his team.

Mimi Hu

Homeowner

Steven came by our place to provide us a quote for a multiunit conversion. He was generous with his time and knowledge.

Mohammad Iqbal

Real Estate Investor

Ready to Get Started on Your Next Project?

Ready to start your construction project? Call AgileBuilds Ltd today for a FREE, no-obligation quote and let our team deliver a smooth, long-lasting renovation you can count on.