Getting Started
So you want to build a multiplex?
Explore questions and steps to consider below
What is a multiplex?
A multiplex is a small, multi-unit residential building. In Toronto, up to four units are legal.
Duplex![]()
Triplex![]()
Fourplex![]()
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Getting Started
Getting Started
Before you jump in it’s helpful to understand all the steps of the development process
To get you started we have assembled a guide to walk you through the early phases of your multiplex project. There are lots of decisions to make and we want to help you along the way. Explore the pages below to find out what kind of multi-unit project is for you, understand how much it costs, and how to actually make it happen in Toronto.
Who are you building for?
This section asks questions about the relationships between the people who will live in your multiplex.
Get to know your house
This section describes how to measure your house and consider how many units you can add.
Pick your scenario
Click here to learn about two different paths for building multiplexes: if you own a home, or are looking to buy.
Build your team
This page describes the team of professionals you’ll need to hire to make a project happen.
Project budget basics
Click on this page to learn about all the costs for building a multiplex. 
This website, including all data and information incorporated herein, is being provided for information purposes only and is not intended for and has not been approved for use for construction at any location. For certainty, The University of Toronto, John H. Daniels Faculty of Architecture Landscape and Design and LGA Architectural Partners provides no representation or warranty regarding any use of or reliance upon this website, including no representation or warranty that this website complies with applicable laws (including any applicable zoning by-laws or building code requirements) and no representation or warranty that any cost estimates included in or based upon this website have been validated by the applicable market. Any use of or reliance upon this website by any person for any purpose shall be at such person’s sole risk and The University of Toronto, John H. Daniels Faculty of Architecture Landscape and Design and LGA Architectural Partners shall have no liability or responsibility for any such use of or reliance upon this website by any person for any purpose. Prior to any use of or reliance upon this website by any person for any purpose, consultation with a professional architect duly licensed in the applicable jurisdiction is strongly recommended.
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