ADU Builders in Toronto

As housing shortages continue to be a challenge in Toronto and across Ontario, homeowners are looking for smart ways to add space and value to their properties. Additional Dwelling Units (ADUs) have become a popular solution, offering a way to accommodate family members, generate rental income, or simply maximize underutilized space. At Novacon Construction, we specialize in designing and building high-end ADUs that seamlessly blend with your existing home while meeting all local regulations and zoning requirements in Toronto and the GTA.

As an experienced ADU builder, we take a design-build approach to ensure every project runs smoothly from concept to completion. Whether you’re converting a basement, adding a laneway suite, or constructing a garden suite, our team handles everything—including permits, architectural design, and high-quality construction. With the growing demand for affordable housing, an ADU is a smart investment that provides long-term benefits. If you’re considering building an Additional Dwelling Unit in Toronto, we offer free consultations to help you explore your options.

Toronto ADUs at a Glance

  • Who we are: a licensed, bonded and insured Toronto design-build company based in Scarborough, building custom homes, major additions and ADUs since 2004. Best of Houzz 2025 award recipient.
  • What Toronto allows: four-unit multiplexes are permitted city-wide, and since June 2025 buildings of up to six units are permitted in the Toronto and East York District and Ward 23. Laneway suites (city-wide since 2019) and garden suites (city-wide since 2022) are permitted in the rear yard where the lot meets their criteria.
  • The ADUs we design and build: laneway suites, garden suites and in-law suite additions for multi-generational families.
  • Which one fits your lot: a lot that shares a property line with a public lane may suit a laneway suite; a lot without a lane may suit a garden suite if fire access works from the street; and where neither works, an in-law suite addition to the main house is often the answer. We confirm this during a feasibility review, before any design work.
  • What we handle: feasibility and zoning review, architectural design, structural engineering coordination, permit drawings and applications, construction and City inspections, with a dedicated project manager, $5 million liability insurance, WSIB coverage and a 2-year warranty.
  • Costs to plan for: laneway suites typically start around $350,000; in-law suite additions follow our home addition cost ranges. City permit fees in 2026 are $18.56 per square metre plus $56.33 per new unit, and eligible owners can defer development charges on laneway and garden suites.

Last updated October 2026.

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What Are Additional Dwelling Units?

An Additional Dwelling Unit (ADU), also known as an Accessory Dwelling Unit, is a self-contained living space built on the same property as a primary residence. These units provide a fully functional home with a kitchen, bathroom, and sleeping area, making them a practical solution for multi-generational living, rental income, or increasing property value. ADUs can take different forms, including secondary suites (such as basement apartments), garage conversions, or structures separate from the main home, like laneway houses or garden suites.

Building an ADU on a residential property in Toronto comes with specific zoning and permit requirements, but when done right, it’s a great way to maximize space and add flexibility to a home. These units offer homeowners the opportunity to create additional living quarters without the need for a major home expansion. Whether you’re looking to accommodate aging parents, provide a private space for adult children, or tap into rental income potential, ADUs are a smart and sustainable housing solution.

Excellent company! Amazing people! Great communication! Exceptionally conscientious and high-quality work! Would absolutely recommend them for big or small reno’s!

Pavel and his team are excellent people to work with. Attention is paid to every detail and suggestions and preferences listened to and acted upon. Their word is their seal. A quality build in a timely and very professional manner.

Novacon was not only very competent construction team who did great work but they were a pleasure to have in my home.

Why ADUs Are So Popular in Toronto & the GTA

With rising housing costs and a growing need for additional living space, many Toronto homeowners are turning to ADUs as a smart investment. Recent zoning changes have made it easier to build these units, and the benefits go beyond just adding square footage. Here’s why ADUs are in high demand across the GTA:

  • Additional Income for Homeowners – ADUs offer a great way to generate rental income, helping homeowners offset their mortgage or boost their cash flow. With Toronto’s competitive rental market, a well-designed ADU can provide steady returns.

  • More Space for Family – Whether it’s a private suite for aging parents, a separate home for adult children, or a guesthouse for extended family, ADUs create flexible housing options without the need for a major home addition.

  • Increased Property Value – A well-built ADU can significantly boost a home’s property value, making it more appealing to future buyers who see the potential for extra space or rental income.

  • Adaptability & Future-Proofing – ADUs offer long-term flexibility. They can be used as a home office, a long-term rental, or a downsized living space for homeowners looking to age in place.

With the demand for housing in Toronto at an all-time high, adding an ADU is a smart way to maximize a residential property’s potential while creating a functional and valuable living space.

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Excellent company! Amazing people! Great communication! Exceptionally conscientious and high-quality work! Would absolutely recommend them for big or small reno’s!

Pavel and his team are excellent people to work with. Attention is paid to every detail and suggestions and preferences listened to and acted upon. Their word is their seal. A quality build in a timely and very professional manner.

Novacon was not only very competent construction team who did great work but they were a pleasure to have in my home.

Home Remodeling project Torontoin Toronto Gallery (59)

Types Of ADU Dwelling Units

There are several types of ADUs that homeowners in Toronto can build, each offering unique benefits depending on space, budget, and zoning regulations. Whether you’re looking for a separate rental unit or extra family living space, here are the most common ADU options:

  • Detached Dwellings – These are standalone units built on the same property as the main home. Coach houses, garden suites, and laneway suites fall into this category, offering complete privacy and independence.

  • Semi-Detached Dwellings – An ADU that shares a partial wall with the main home but has a separate entrance. This setup works well for homeowners who want additional space while maintaining a connection to the main house.

  • Attached ADUs – These units are physically connected to the main home, such as a home addition or an over-the-garage suite. They provide convenient access while still functioning as a self-contained living space.

  • In-Law Suites (Secondary Suites) – Often located in the basement, these ADUs are a popular way to create additional living space without expanding the home’s footprint. They are great for multi-generational families or rental income.

  • Laneway & Garden Suites – These detached units are built in the backyard or along a laneway. They are perfect for maximizing unused outdoor space while adding functional living quarters.

Each type of ADU offers homeowners in Toronto flexible living solutions, whether for rental income, extended family, or personal use. Choosing the right style depends on space availability, local zoning regulations, and the homeowner’s needs.

Building an ADU In Toronto

Building an Accessory Dwelling Unit in Toronto has become more accessible thanks to zoning updates and Ontario’s push for more housing options. Whether you’re building on the property as an extension of your home or constructing a separate unit like a laneway or garden suite, it’s essential to understand local regulations before starting your project.

Ontario’s Planning Act requires municipalities to permit additional residential units on most residential lots, and the City of Toronto goes further than the provincial minimum:

  • Multiplexes: buildings with up to four units are permitted city-wide, and up to six units in the Toronto and East York District and Ward 23 (adopted by City Council in June 2025).
  • Laneway suites: permitted city-wide since July 2019 on residential lots that share a property line with a public lane.
  • Garden suites: permitted city-wide since 2022 in the rear yard of lots without a lane, subject to fire access, size and setback criteria.

Every ADU still needs a building permit and must meet the zoning by-law and the Ontario Building Code for your specific lot.

Navigating these regulations can be complex, but working with an experienced design-build team ensures your ADU meets zoning, permit, and building code requirements. With the right planning, an ADU can be a valuable addition to any Toronto home.

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Toronto’s Multiplex Rules: Fourplexes, Sixplexes and Backyard Suites

Toronto’s multiplex rules permit residential buildings with up to four units city-wide. In June 2025, City Council adopted amendments allowing buildings of up to six units in the Toronto and East York District and Ward 23, and these are now in force. A laneway or garden suite is a separate permission for the rear yard, so on many lots a backyard suite can be planned alongside the main house, subject to its own criteria such as fire access and setbacks.

Multi-unit projects raise questions about building code upgrades, servicing, fire separations and development charges that need to be answered before design starts. Our feasibility review sets out what your lot can support and which combination of units makes sense for your goals, whether that is housing family members or long-term rental income.

Learn More About ADU Building Options

If you’re thinking about adding a living unit to your property, working with an experienced ADU builder in Toronto is essential to ensure a seamless process. At Novacon Construction, we specialize in designing and building custom ADUs that fit your home’s style, meet local zoning requirements, and maximize your property’s potential. Whether you need a custom addition, a laneway suite, or a secondary suite, our expert team handles everything from planning and permits to high-quality construction.

As a leading design-build contractor in the GTA, we take a personalized approach to every project, ensuring your custom ADU is functional, beautiful, and built to last. Our transparent process and award-winning customer service set us apart, making ADU construction stress-free and efficient. If you’re ready to explore your options for an Additional Dwelling Unit, contact Novacon Construction today for a free consultation and expert guidance on your next project.

Call us today at 416-750-7555 or contact us below to schedule your consultation

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Frequently Asked Questions

Yes, ADUs (Accessory Dwelling Units) are allowed in Ontario. In fact, the province has actively encouraged their development as a way to address housing shortages and increase affordable housing options. Under the Ontario Planning Act, all municipalities—including Toronto—are required to update their zoning bylaws and Official Plans to permit ADUs on residential properties.

Homeowners are allowed to build multiple units, depending on the property configuration. For example, a home may have up to three living spaces within the main house, or two in the main home and one in a detached structure like a garden suite or laneway house. This legal backing has made it significantly easier for homeowners to add ADUs across Ontario.

Building an ADU is absolutely worth it for many homeowners in Toronto and the GTA. Not only do ADUs offer additional living space for family or guests, but they also provide the opportunity to earn rental income, helping offset mortgage costs or property expenses.

Beyond income potential, an ADU adds flexibility to your home—think in-law suite, home office, or even future downsizing options. With demand for affordable housing on the rise and zoning rules becoming more favourable, investing in a high-quality custom ADU is a smart long-term move that offers both lifestyle and financial benefits.

Yes, you can build a guest house in your yard in Ontario, but it must comply with local regulations as an Accessory Dwelling Unit. In cities like Toronto, recent changes in zoning allow for detached dwellings such as garden suites or laneway houses to be constructed on residential lots. These structures function like guest houses and must include essential amenities like a kitchen, bathroom, and sleeping area.

If you’re planning on building on the same property, you’ll need permits and must follow setback, height, and size requirements set by your municipality. Working with an experienced ADU builder in Toronto, like Novacon Construction, helps ensure your guest house project is fully compliant and built to code.

Definitely! Obtaining a permit makes sure your project is in compliance with Ontario Building Code. Inspections of the project insure your safety!

No. Novacon Construction Inc. will get all relevant permits required on your behalf.

Yes we are a full service DESIGN – BUILD company. We can provide full interior designs and architectural/engineer drawings to suit every type of project.

Yes, we carry $5,000,000 liability insurance and have WSIB. We will provide all clients with copies of our certificates.

Yes. All standard renovation or remodeling projects come with a 2-year warranty.

Novacon Construction has been in business since 2004, more than 20 years of design-build work on Toronto homes.

Yes. Please see our reviews. We will also provide a list of previous clients when requested. You can also view our project gallery here.

Yes, adding an ADU can significantly increase your property value. By creating an independent, self-contained living unit, you’re not only adding more usable square footage, but also increasing the functionality and market appeal of your home.

Buyers are increasingly looking for homes with built-in rental potential, multi-generational living options, or flexible space—and an ADU checks all those boxes. In competitive markets like Toronto and the GTA, a well-designed custom ADU built by a trusted design-build contractor like Novacon Construction can add substantial long-term value to your home.

Phone:
416-750-7555

121 Lebovic Ave, Suite C01
Scarborough, ON M1L 4T7

E-mail:
info@novacon.ca

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