Guide to Additional Dwelling Units - Creating more housing options on your property - a step-by-step guide to adding a second, third or fourth dwelling unit

Oct 29, 2026

Guide to Additional Dwelling Units (ADUs) explains how Kitchener residents can add a separate, self-contained second, third, or fourth dwelling on the same property as an existing detached, semi-detached, or street-fronting townhouse. It summarizes key zoning changes approved March 25, 2024, eligibility requirements, and how ADUs may be configured as duplex/triplex/fourplex, in-law suites, basement apartments, backyard homes, granny-flats, carriage houses, or tiny homes. The guide then outlines a step-by-step process from discovery and design inspiration through approvals, permits, and building, including budgeting, tree and environmental protection, and community communication.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages42

Reading Time1 h 46 min

AccessFree to download

How to use this Guide

Step 1: Discover the Possibilities

Step 2 : Getting Started

Step 3: Plan Your Project

Step 4: Approvals & Permits

Step 5: Build Your ADU

More Information

MARCH 2026 Guide to Additional Dwelling Units Creating more housing options on your property: a step-by-step guide to adding a second, third or fourth dwelling unit (Intentionally Blank) | Kitchener is growing and people are looking for different living options. On March 25, 2024, Kitchener City Council approved zoning regulations that allow up to 4 dwelling units on many residential lots.
These units have lots of names. When they are part of the main building they can be called duplex, triplex, fourplex, in-law suite, or basement apartment. When they are in a smaller separate building they can be called backyard homes, granny-flat, carriage house or tiny homes. In Kitchener, they are all called additional dwelling units or ADUs.
In all cases, an ADU is a separate and selfcontained dwelling unit on the same property asa single detached, semi-detached or streetfronting townhouse dwelling.
This guide provides an overview of what you need to know to develop ADUs on a residential property in Kitchener. |

How to use this Guide
Follow the headings step-by-step
Not everything will be relevant to your project
Refer back as your project progresses | | --- | --- | | City staff are here to help! Contact us by phone, by email or in person at City Hall.
Phone: 519-741-2345
Email: [planning@kitchener.ca](planning@kitchener.ca)
In Person: City Hall, 200 King St W, Kitchener
• Book an appointment to plan your visit
• Drop in during business hours Monday to Friday 8:30 am-5:00 pm | | |

| | Step 1: Discover the Possibilities.…........................................... 1
⚬ Design Inspiration
⚬ CMHC Housing Catalogue Designs
Step 2 : Getting Started.................................................................7
⚬ Understanding ADUs
⚬ Understand the Property
⚬ Understand the Rules: the Zoning By-law
￭ Zoning Highlights
• Detached Dwellings
• Attached ADUs
• Buildings
• Parking
⚬ Understand the Rules: Ontario Building Code
Step 3: Plan Your Project............................................................18
⚬ Build your Team
⚬ Develop a Budget
⚬ ADU Grant Program
⚬ Protect Trees & the Environment
⚬ Draft your Plans
Step 4: Approvals & Permits.......................................................24
⚬ Overview of Permits
Step 5: Build Your ADU...............................................................27
⚬ Communicate with your Neighbours ⚬ Schedule Inspections | | --- | --- | --- | | | More Information..........................................................................30
⚬ Questions? Reach out!
⚬ Frequently Asked Questions ⚬ Sample Architectural Plans
⚬ Progress Checklist | | Step 1: Discover the Possibilities |
169 Fifth Ave – 4 unit dwelling (constructed by: Bobicon Ltd.)
ADUs can provide many benefits for homeowners and the overall community including:
• providing homes for family members like adult children or aging parents
• providing homes in existing neighbourhoods where services, schools and transit already exist
• helping generate rental income
Thinking about why you are building your ADU(s) will help guide your project design and budget.
To be eligible for an ADU(s) the following
criteria must be met:
􀀁 a single detached dwelling, semidetached dwelling or street-fronting townhouse dwelling must be permitted on the lot
􀀁 the lot must be connected to full municipal services
􀀁 the lot size, site layout and building design must comply with the Zoning Bylaw and the Ontario Building Code (see Chapter 2 to learn about zoning rules) | | --- | |
Once you have confirmed that you can build an ADU(s), take some time to look for inspiration images online and in your neighbourhood and consider what might work for you, your property and your desired outcomes. Visit [ReHousing.ca](ReHousing.ca) to see examples of how ADUs can be added to different kinds of hom

FAQs

What is an ADU in Kitchener?

An ADU is a separate and self-contained dwelling unit located on the same property as an existing detached, semi-detached, or street-fronting townhouse dwelling.

What eligibility criteria must a property meet to build an ADU?

The lot must permit a single detached, semi-detached, or street-fronting townhouse dwelling, be connected to full municipal services, and have a site layout and building design that comply with the Zoning By-law and the Ontario Building Code.

What does the guide cover in the step-by-step process?

The guide walks through discovery and design inspiration, understanding ADUs and property rules, planning the project (team, budget, grants, and tree/environment protection), approvals and permits, and building the ADU while communicating with neighbors and scheduling inspections.

Oct 29, 2026

Upload by anakgang17