ADU Ontario

Accessory Dwelling Unit Services for Homeowners Across Ontario

Looking to expand your living space or generate additional income? At ADU Ontario, we specialize in guiding homeowners through the process of adding an Accessory Dwelling Unit (ADU) to their residential property. Whether you’re considering a basement apartment, a garden suite, or a detached accessory dwelling unit, our team is here to assist you every step of the way.

From understanding zoning by-law requirements to securing a building permit, we provide comprehensive support to ensure your ADU project complies with all local regulations and the Ontario Building Code .

📍 Serving communities throughout the province of Ontario
📞 Call us: 9am–9pm, Monday–Saturday
📩 REQUEST A FREE CONSULTATION

ABOUT US

Your Trusted Partner in ADU Development

At ADU Ontario, we understand the unique challenges and opportunities that come with constructing an ADU. Our mission is to simplify the process for property owners, ensuring that every additional unit is designed and built to meet both your needs and all regulatory requirements.

We offer personalized consultations, detailed planning assistance, and expert advice on everything from ADU design to navigating zoning regulations. Our goal is to help you create a self-contained residential unit that enhances your property’s value and functionality.

OUR SERVICES

Solutions for Every Accessory Dwelling Project

1. Planning & Zoning Consultation

Understanding your property’s zone and the associated zoning requirements is crucial before beginning any construction. We provide:

• Detailed analysis of your property’s zoning by-law
• Assessment of property lines and setbacks
• Guidance on permissible types of ADUs for your lot

Our experts ensure that your ADU on a lot aligns with all local zoning regulations, paving the way for a smooth development process.

2. Building Permit Assistance

Securing a building permit is a vital step in the ADU development process. We assist with:

• Preparing and submitting all necessary documentation
• Ensuring compliance with the Ontario Building Code requirements
• Liaising with municipal authorities to expedite approval

Our team ensures that your building permit application is thorough and accurate, minimizing delays and complications.

3. Custom ADU Design Services

A well-thought-out ADU design is key to creating a functional and comfortable dwelling unit. We offer:

• Tailored design plans that maximize floor area within allowable limits
• Solutions for integrating the ADU seamlessly with your existing main dwelling
• Options for both attached and detached structures

Whether you’re converting a basement or attic or building a new structure on the same lot, our designs prioritize both aesthetics and compliance.

4. Code Compliance & Safety Reviews

Ensuring your ADU meets all safety and structural standards is non-negotiable. Our services include:

• Evaluating ceiling height requirements and plumb systems
• Implementing measures to prevent the spread of fire from one part of the house to another
• Designing for proper ventilation to avoid the spread of smoke from one unit to the rest of the house

We ensure that your self-contained dwelling unit adheres to all building code stipulations, providing peace of mind for both you and future occupants.

5. On-Site Consultations & Project Management

From initial concept to final inspection, we’re with you every step of the way. Our comprehensive project management includes:

• On-site evaluations to determine the best location for your unit
• Coordination with contractors and inspectors
• Ongoing support to address any challenges that arise during construction

Our hands-on approach ensures that your ADU development proceeds smoothly and efficiently.

Why Choose ADU Ontario?

• Expertise: Deep understanding of the Ontario Building Code and local by-laws
• Personalized Service: Tailored solutions to meet your specific needs and property characteristics
• Comprehensive Support: From initial planning to final approval, we’re with you every step of the way
• Commitment to Quality: Ensuring that every dwelling unit we assist with is safe, functional, and compliant

Ready to Start Your Dwelling Unit Journey?

Embarking on the path to adding an additional dwelling unit can be daunting, but with ADU Ontario, you’re in capable hands. Whether you’re looking to create a secondary dwelling unit for family, rental income, or personal use, we provide the expertise and support you need.

📞 Call us today: 9am–9pm, Monday–Saturday
📩 Or fill out our form to request your free, no-obligation consultation

Let’s build something great—right in your own backyard.

Note: All services are subject to local zoning regulations and the Ontario Building Code. It’s essential to consult with professionals to ensure compliance with all applicable laws and standards.

Frequently Asked Questions – ADU Ontario

If you’re considering building an ADU or adding additional residential units to your property, you likely have questions. Below are some of our most frequently asked questions to help you get started confidently.

What is an ADU, and how does it work?

An ADU is a self-contained dwelling unit that includes a kitchen, bathroom, and sleeping area. It’s either attached to or separate from the principal dwelling and designed to function independently. These units are built to meet strict safety, size, and livability standards, and they’re growing in popularity across Ontario as a smart way to create additional housing.

Are ADUs permitted across Ontario?

Yes. Thanks to updated legislation, ADUs are permitted in most zones across the province, though building code rules can vary by municipality. That’s why it’s essential to review your city’s zoning by-law and compliance needs. Whether you’re building a detached ADU or planning an addition to an existing dwelling, it’s important to confirm what’s allowed on your lot.

What types of ADUs can I build?

There are several types of ADUs in Ontario, including:

• Basement units (within the principal dwelling)
• Garden suites or coach houses (in a backyard or detached garage)
• Interior conversions in a basement or attic
• A separate building or accessory structures

Each unit is located differently depending on your lot and zoning rules. Some are fully separate; others are connected but still function independently.

What are the minimum standards for an ADU?

The building code sets out minimum standards for size, safety, structure, and systems. Every dwelling unit requires:

• Independent kitchen and bathroom
• Proper ventilation and fire separation between the unit and the rest of the house
• Soundproofing and private entrances
• Compliance with the gross floor area and lot coverage rules

Each unit requires appropriate heating, plumbing, and electrical systems, and building code allows a house to include one ADU (unless municipal bylaws say otherwise).

Where can the ADU be built on my property?

The unit to a house served by municipal water and sewer typically has more flexibility. The unit is located in your building on the property depending on setbacks, zoning, and structure types. You can create an ADU inside your existing home or build a separate building—such as over a detached garage—if your zone permits.

Can I build a detached ADU?

Yes! A detached ADU is a popular option in many cities. This freestanding accessory structure sits apart from your principal dwelling, offering complete privacy. However, setbacks, maximum floor area, and zoning compliance will still apply. Adus can be built on qualifying lots if they meet municipal requirements.

Does an ADU increase property value?

Yes. When designed and built correctly, ADUs offer excellent ROI. These units add flexible living space that appeals to buyers, renters, and multigenerational families. In most markets, adding a new additional dwelling can boost your property value significantly while offering long-term rental potential.

What are the key safety and code requirements?

Each ADU must meet current building code standards. These include:

• Unit needs safe exits in case of emergency
• Prevention of fire and spread of smoke from one unit
• Fire-rated construction to stop the spread of fire from one part of the home to another
• Proper insulation between the unit and the rest of the home
• Sufficient plumb and HVAC systems

Your ADU program must also include verification that the unit to have a single or separate mechanical setup, depending on your layout and system type. Some homes can use a single furnace and common system, though this must be approved.

What if my house is served by a septic system?

In rural areas, the house served by a septic system may still qualify for an ADU—but it must pass a capacity assessment. The unit requires enough septic system capacity to accommodate additional water and waste flow. This is reviewed during the building permit process.

Can I add more than one ADU?

In most municipalities, building code allows a house to include only one ADU. However, some areas allow both a secondary suite (such as a basement unit) and a garden suite or detached structure. The options vary by zone, so we recommend a full review of your local zoning by-law.

What are the cost implications?

Every build is different, but we always provide up-to-date cost implications based on your location, zone, and project complexity. Whether you’re converting a basement or planning a new additional dwelling, our consultations offer real numbers you can plan around.

Why consider an ADU?

Adus offer a versatile solution to growing housing needs. Whether you want to accommodate family, generate rental income, or add value to your home, they provide flexible and long-term additional housing options. In short: they make your property work harder and smarter for you.

Let us help you unlock the full potential of your lot and start your own ADU journey. For expert help building an ADU, call us at ADU Ontario today or request a consultation through our contact form.