Q & A

GENERAL INFORMATION

1.What is an ADU (Accessory Dwelling Unit)?

An Accessory Dwelling Unit (ADU) is a secondary, self-contained living space located on the same property as a main residential home. ADUs are often designed to provide additional housing, accommodate family members, generate rental income, or add flexible living space.

ADUs come in various forms, including garden suites (built in the backyard),laneway suites (constructed along a laneway), and basement or garage conversions within the existing structure. Known for their affordability, compact size, and support for multi-generational living, ADUs are an attractive option for increasing a property’s functional value and versatility

2.Which cities in Ontario allow ADU construction?

In Ontario, several cities have adopted by-laws allowing Accessory Dwelling Units (ADUs) in alignment with Ontario’s Bill 23, which promotes affordable and flexible housing solutions. Key cities currently permitting ADU construction include:

City of Toronto (covering downtown Toronto, East York, Etobicoke, North York, and Scarborough)

Mississauga

Brampton

Oakville

Markham

Richmond Hill

Hamilton

Niagara Falls

Oshawa

Pickering

Many other cities and towns across Ontario are actively working to pass similar by-laws, supporting Bill 23’s goal of expanding ADU options and increasing housing availability across the province.

3.Do I need a permit to build an ADU in my backyard?

Yes, you will need a building permit to construct an ADU in your backyard. Any accessory unit over 15 square meters (approximately 160 sq.ft.) requires a permit to ensure compliance with local building codes and regulations.

At Garden Housing, our design team handles the entire application process for you, managing all necessary documentation and steps to secure the required permits—allowing you to focus on planning your new space with confidence and ease.

4.Are there specific zoning regulations for garden suites in

residential areas?

Yes, there are specific zoning regulations for garden suites in residential areas, and these vary by city. Regulations may include:

Maximum Size: For example, Toronto allows up to 645 sq.ft, while

Mississauga permits up to 100 sq.m (1,076 sq.ft) for larger lots.

Setback Requirements: Minimum side and rear setbacks from property lines, which differ across municipalities.

Separation Distance: Minimum distance between the main house and the garden suite, such as 5 meters in Toronto and 2.5 meters in

Mississauga.

Building Height Limits: Some cities allow garden suites up to 6 meters (18 feet), enabling two-story options.

Our team will assess and ensure that your garden suite design complies with these local zoning regulations to meet both functional and legal

requirements.

5.Are there specific zoning regulations for garden suites in residential areas?

Building an ADU on a property with a heritage designation is possible but typically requires additional steps and compliance with specific restrictions.

Heritage properties are subject to regulations designed to preserve the

historical character of the site, which can affect the design, materials,

placement, and overall integration of the ADU. Approval from the local heritage planning department is usually necessary, and they may request modifications to ensure the ADU harmonizes with the property’s heritage features.

6.Do I need to obtain my neighbors’ approval to build my garden suite?

No, you do not need to obtain your neighbors’ approval to build a garden suite.

However, you will need to secure a building permit to ensure your project meets all local regulations and zoning requirements.

7.Can I build a garden suite if I have trees in the backyard?

Yes, you can build a garden suite if you have trees in the backyard, but certain tree protection regulations may apply. Many cities require preserving or protecting existing trees, which can influence the placement and design of your garden suite.

Our team will assess your property and develop solutions that comply with local tree protection guidelines to ensure your garden suite integrates seamlessly with the natural landscape.

8.How will adding a garden suite impact my property value?

Adding a garden suite will generally increase your property value, as it provides additional living space and flexibility. For banks and mortgage firms, a property with income-generating potential—such as a rentable garden suite— often results in a higher valuation. The added functionality, potential rental income, and appeal of a separate living area make your property more attractive to buyers and lenders alike, positively impacting its overall value.

9.Will my property taxes increase if I add a garden suite?

There may be a slight increase in property taxes when you add a garden suite, as it adds value to your property. However, given the current housing demand, federal, provincial, and municipal governments are encouraging the development of additional housing like garden suites to help address affordability challenges.

For now, municipalities are more focused on supporting homeowners in building these units rather than significantly raising property taxes.

10.I have a pool in my backyard; can a garden suite be built above it or near it?

If you have a pool in your backyard, it may still be possible to build a garden suite near or potentially above it, depending on the site conditions.

Our engineering team will assess your property layout and structural requirements to determine the best solution. We’ll work to design a garden suite that integrates safely and effectively with existing features like your pool, maximizing backyard space while meeting all safety and building regulations.

11.I’m not sure if my backyard is suitable for building a garden suite. What can I do?

If you’re unsure whether your backyard is suitable for a garden suite, contact us for a free consultation. Our team will assess your property’s unique features, zoning requirements, and potential design options to help you determine the best approach for building a garden suite.

DESIGNS & PERMIT

1.What is the maximum size allowed for a garden suite in my

backyard?

The maximum size for a garden suite varies by city and is set by local zoning regulations. Here are examples of allowable sizes in some Ontario cities:

Toronto: 645 sq.ft

Mississauga: 590-1076 sq.ft, depending on lot size

Brampton: 375-860 sq.ft, depending on lot specifics

Oakville: 450 sq.ft

Hamilton: 800 sq.ft

Markham: 645 sq.ft

Richmond Hill: 5% of lot size or up to 420 sq.ft

Niagara Falls: 1000 sq.ft

Pickering: Up to 50% of the main house size or a maximum of 1600 sq.ft

Oshawa: 645-1600 sq.ft, depending on zoning

Our team will help ensure your garden suite design adheres to local regulations, optimizing your available space.

2.Can I build a two-story garden suite?

Yes, building a two-story garden suite may be possible, depending on your city’s height regulations outlined in the municipal zoning by-law. Some cities permit garden suites up to 6 meters (18 feet) or more, which can accommodate a two story design.

Our team will review your city’s height limits and zoning rules to assess the feasibility of a two-story structure and will work with you to design a garden suite that fully complies with these regulations.

3.Is it possible to include a basement in a garden suite?

Yes, it is possible to include a basement in a garden suite, and we often recommend this option to our customers. Adding a basement not only strengthens the foundation but also increases the long-term investment value by creating additional living or storage space.

We have completed many one-story plus basement projects with large, above ground windows and a separate entrance, allowing for more natural light and versatile use of the basement area. Our team can help you design and construct a basement that meets building codes and enhances the functionality of your garden suite.

4.How much space should be left between my main home and the ADU (Garden Suite)?

The required space between your main home and the ADU varies by location:

Toronto: A minimum distance of 5 meters is required. However, if the distance is increased to 7.5 meters, the maximum height of the garden suite can increase from 4 meters to 6 meters.

Mississauga: The minimum required distance is 2.5 meters.

Markham: The minimum required distance is 6 meters.

Our team offers a free consultation to help you understand the specific spacing requirements for your area and design a garden suite layout that complies with city regulations while maximizing your property’s potential.

5.What types of designs will be included for my ADU?

There are several types of design services for your ADU, each addressing key aspects of construction and functionality:

Architectural Design: Focuses on the layout, appearance, and integration of the ADU with your property, ensuring a functional and visually appealing structure.

Structural Design: Ensures stability and durability by addressing foundations, framing, and load-bearing elements to meet safety standards.

Engineering Design: Includes detailed planning for electrical, plumbing, and mechanical systems, ensuring efficiency and compliance with building codes.

HVAC Design: Customizes heating, ventilation, and air conditioning systems for optimal climate control, suited to the ADU’s size and purpose.

Our team provides comprehensive support in each of these areas, creating a safe, comfortable, and well-designed ADU that meets your unique needs and preferences.

6.Is a Topographic Survey required for the design process?

Yes, a Topographic Survey is required. The municipal building department will request an up-to-date topo survey when applying for a building permit, and our architects also need a digital CAD file of the survey to create accurate site plan documents.

We can assist you in arranging this survey through a third-party service at a reasonable price to ensure a smooth and efficient process.

7.Can your team handle all the permit application processes?

Yes, our team can handle all aspects of the permit application process for your ADU project. We charge a one-time design and service fee that covers all design work and the full permit application process. This fee does not include external costs, such as the municipal application fee, topographical survey fee, or Committee of Adjustment (COA) fee, if required.

Our streamlined service provides comprehensive support to make the permit process as smooth and efficient as possible.

8.How long does the design phase and permit approval process take?

The design phase and permit approval process typically takes:

Design and Document Preparation: Approximately 45 business days for our team to complete the design and prepare all necessary application documents.

Permit Approval: Typically 3-4 months for municipal review and final approval.

Our team works diligently to streamline this timeline, ensuring that all requirements are met to keep your project moving forward smoothly.

9.If the permit is not approved, can I get a refund?

Before starting the project, our expert team will assess the feasibility of the garden suite based on your property’s unique conditions and local zoning requirements. This initial evaluation helps determine the likelihood of permit approval, allowing us to address potential challenges early and maximize the chances of a successful outcome.

Our design and submission process includes three key steps:

Design Creation

Zoning Review Submission

Final Permit Application Submission

If the zoning review is not approved, we will make the necessary revisions and resubmit. If the revised application is still denied, we will refund the remaining service fee for the application stage. This structured approach ensures full support throughout the process and provides peace of mind with a partial refund if the project cannot proceed.

10.Does Garden Housing provide landscaping services for the area around the ADU?

Yes, Garden Housing offers landscaping services to enhance the area around your ADU at a competitive price. Our team can design and implement features such as pathways, patios, garden beds, and privacy plantings to create a cohesive outdoor space that beautifully complements your ADU.

11.What types of design customizations are available for my ADU?

We offer a high standard in our basic ADU package, featuring quality materials and essential design elements for lasting value. Additionally, we provide numerous upgrade options to further personalize your ADU. Our team will work closely with you to create an ADU that aligns with your style, functional needs, and budget, seamlessly blending high-standard essentials with customizable enhancements tailored to your vision.

12.Can I add features like solar panels or a green roof to the ADU?

Yes, you can add features like solar panels or a green roof to your ADU.

These upgrades boost energy efficiency, reduce environmental impact, and can help lower utility costs over time. Our design team can seamlessly integrate these sustainable features into your ADU plan, ensuring structural support and compliance with local building regulations. We’ll collaborate with you to explore eco-friendly options that align with your sustainability goals and aesthetic preferences.

13.How many amps does the garden suite require, and will I need to upgrade my electrical panel?

A 100-amp service is typically required for a garden suite. If your current electrical panel is only 100 amps, you’ll need to upgrade it to accommodate the additional load. This upgrade should be done by a licensed electrician to ensure safety and compliance with electrical codes.

14.Can I use gas for my ADU?

Yes, you can use gas for your ADU, but we recommend different approaches based on the ADU’s design. For a one-story garden suite, electricity is typically sufficient, using a heat pump and electric water heater for energy efficiency and space savings.

However, if you’re planning a two-story unit or one with a basement, a gas connection may be a better solution to meet the additional heating requirements effectively.

15.How is the sewer handled for the ADU? Can it connect directly to the municipal sewer line?

Connecting the ADU directly to the municipal sewer line is possible, but it often incurs a significant service fee from the city. Our recommended solution is to connect the ADU to your main house’s sewer system through the basement, which can reduce costs and simplify the installation process.

CONSTRUCTION & CONNECTIONS

1.What kind of foundation will you provide for the garden suite?

We offer three foundation options for your garden suite, including a recommended basement option for enhanced durability and investment value:

Helical Piles (included in our basic package):

Helical piles are screw-like steel supports drilled deep into the ground, providing a stable foundation with minimal excavation. This method is quick to install, cost-effective, and suitable for various soil types. It’s also minimally invasive, making it an ideal choice for established backyards where disruption is minimized.

Slab-on-Grade (upgrade option): Slab-on-grade foundations are concrete slabs poured directly onto the ground, creating a solid and durable base.

This option offers superior support, insulation, and moisture protection.

Slab-on-grade is especially beneficial for larger or permanent structures, providing energy efficiency by insulating the garden suite from ground temperature fluctuations.

Basement Foundation (recommended option): Adding a basement not only strengthens the foundation but also increases livable space and long term investment value. A basement foundation provides additional storage or usable living space, enhancing the overall appeal and functionality of your property.

Our team can guide you in selecting the foundation that best suits your garden suite’s requirements and your property conditions.

2.How are the utility connections handled, such as water, sewer, gas, and electrical lines?

Utility connections for your garden suite are fully integrated with your main house and include the following:

Water Line: Provides a reliable water supply to the garden suite.

Sewer Line: Connects to your main sewer system for proper waste

disposal.

Gas Line (optional): Supplies gas for heating and cooking, especially

useful for larger units or those with basements.

Electrical Line: Powers the suite, supporting all appliances, lighting, and climate control systems.

Internet Wiring: Provides high-speed internet access, creating a fully

connected living space.

All connections are installed at a depth of at least 4 feet to comply with code requirements. Our team customizes the utility setup to ensure optimal convenience and functionality for your garden suite.

3.Can I add separate meters for water, electricity, and gas for the ADU, independent of the main house?

Yes, we can add a sub-meter for electricity to monitor usage independently from the main house. For water and gas meters, adding separate meters may depend on approvals from the local authority and may require additional permits and coordination with utility companies.

4.What kind of materials are typically used in Garden Housing’s ADUs?

At Garden Housing, we use locally sourced materials to ensure quality and full compliance with Ontario building codes for our ADUs. This approach ensures durability, sustainability, and strict adherence to local standards in every project, providing long-lasting and environmentally conscious solutions.

5.What is the typical timeline for garden suite construction?

The typical timeline for garden suite construction is generally 3-4 months during warmer months when conditions are optimal. However, this timeline can vary based on project specifics:

Standard Garden Suite: Approximately 3-4 months.

Garden Suite with a Basement: Additional time may be needed for

excavation and foundation work, which can extend the timeline.

We also offer prefabricated suite options, which can significantly reduce

construction time due to off-site manufacturing and faster on-site assembly.

Our team will provide a customized schedule for your project, ensuring

efficient and timely completion.

6.Are there any city inspections required for an ADU?

Yes, the city typically requires multiple inspections throughout the ADU construction process. These inspections ensure that each stage meets safety and building code standards. Key inspections include:

Foundation: Verifying stability and compliance.

Framing: Checking the structural framework.

Water: Ensuring proper water supply connections.

Electrical and Plumbing: Inspecting safe installation and connections.

Rough-In: Reviewing preliminary installations before walls are closed.

Insulation: Confirming proper insulation for energy efficiency.

Final Inspection: A comprehensive review upon project completion.

Our team will manage the scheduling and coordination of these inspections to ensure your ADU project meets all city requirements.

7.Is a warranty provided for the construction of the garden suite?

Yes, we provide a builder warranty for the construction of your garden suite:

1 Year: Coverage for all construction elements, ensuring that everything is built to the highest quality.

2 Years: Coverage for plumbing, electrical systems, and HVAC to protect against any defects.

7 Years: Coverage for major structural components, including framing

and foundation, to ensure long-term durability.

This warranty offers peace of mind and demonstrates our commitment to quality and reliability in every project.

8.Can you provide references for your garden suite projects?

Yes, we can provide references from both finished and ongoing construction projects for your review. Please contact us for more information.

Our model home is located at 4248 14th Ave, Markham, and you’re welcome to visit from Monday to Sunday.