Toronto’s pre-approved garden suite plans cover the design of the building itself, but they do not replace the building permit or the site-specific work that goes with it. According to the City of Toronto, if you choose a pre-approved plan you still need to apply for a building permit, and that permit can only be issued where the construction complies with the Building Code Act, 1992, the Ontario Building Code (OBC), applicable zoning and other applicable law. In practice, the plans give you a head start on the building design, not on proving the suite fits your lot.

What Toronto’s Pre-Approved Garden Suite Plans Actually Cover

The City of Toronto offers a catalogue of four “Made in Toronto” pre-approved designs for garden and laneway suites, including studio and two-bedroom options. Toronto Building reviewed these drawings and found that the designs of the buildings themselves comply with the Ontario Building Code and the City’s zoning by-law. The goal, in the City’s words, is to make building an additional dwelling unit faster and less expensive.

Two details in the City’s wording matter. First, the compliance finding applies to the design of the building. It does not extend to how that building sits on your particular lot. The City states that zoning and OBC requirements related to the placement of the building on the property still have to be reviewed through the building permit application.

Second, the pre-review benefit depends on the design being used without modifications. The City’s guidance on pre-approved building plans explains that because the plans were pre-reviewed for zoning and OBC compliance, the City does not need to review the design if it is used as is. If you change it, that assumption no longer holds, and someone has to take responsibility for the changes (more on that below).

What the plans are not

• Not a permit or an approval to build.
• Not a zoning compliance guarantee for your lot.
• Not a site plan, grading plan or servicing design.
• Not a determination that fire access to your backyard is acceptable.

What You Still Need: Building Permit and Required Submission Documents

When you apply with a pre-approved plan, you do not submit a copy of the plan. Instead, you choose a building form and HVAC system and reference the plan number. You can apply through Toronto Building Online Services or by email using the Application for a Permit to Construct or Demolish. During submission, the City asks you to identify the pre-approved plan type and options in the project description.

The City’s list of required forms and documents includes a site plan: a survey or site plan showing property lines, lot area, right-of-way or easements (referenced to a current survey), and the location of existing and proposed buildings with overall dimensions. Confirm the full, current checklist on the City’s pre-approved garden and laneway suite page, since requirements can be updated. For background on how permit packages are typically assembled, see our overview of building permit drawings in Ontario.

A lot-by-lot checklist: which document resolves which risk

The City’s page lists the documents but does not tie each to the problem it solves. This table does, as a planning aid. It reflects the topics the City identifies; always defer to the City’s current requirements.

Site-Specific Checks the Plans Can’t Resolve: Setbacks, Zoning and Fire Access

Setbacks and zoning

The City provides general setbacks as a quick reference for whether a pre-approved design will comply with zoning. It is explicit that meeting those setbacks does not guarantee compliance with zoning or other applicable law, and that a full review is still required. Treat the quick reference as a screening tool, not a clearance. Lots with existing garages or sheds, unusual shapes or other constraints can raise issues the quick reference does not capture. If your layout cannot meet zoning, a variance may be one path; our guide to the minor variance process in Toronto explains how that works.

Fire department access

The City states that the OBC requires garden suites to have acceptable emergency access, because Toronto Fire Service must be able to reach every building with firefighting and emergency equipment. For each pre-approved plan, you must identify the appropriate fire access requirements based on your property. This is often where a lot that looks perfect on paper runs into trouble: a narrow side yard, a long walk from the street, or obstructions along the route. Refer to the Fire Department Access section of the City’s pre-approved garden and laneway suite page for the applicable guidance, and see our article on fire department access for garden suites for more context.

Water, Sanitary and Servicing: Connections to Your Main House

This is the least understood part of the process. The City’s guidance says that where piping for a new suite connects to the services of the main building, this could constitute a material alteration to the main building, which would require compliance with sentence 7.1.2.4.(2) of Division C of the Ontario Building Code. In other words, the City says that connecting the suite’s piping to the existing house’s services may require compliance with that Building Code provision. Confirm with Toronto Building what this means for your project.

The practical consequences to plan for:

• Your suite design may be pre-approved, but the connection method is a lot-specific decision that needs to be documented.
• As general advice rather than a City statement, the condition of the existing house’s services may affect your project, so it is worth understanding early.
• Someone qualified should assess the existing services early, before the budget is set.

We do not offer specific pipe sizes or code thresholds here because those depend on the building and current OBC requirements; confirm them with the City and a qualified designer or plumber.

Trees, Survey, Grading and Other Lot Constraints That Can Change Your Design

The pre-approved plans are fixed designs; your backyard is not. Trees, grade changes, existing structures and easements can all affect where a suite can go, or whether a given plan fits at all. The City’s required site plan must show easements and existing buildings, which is one reason the survey comes first.

The City’s pre-approved plan page does not detail tree, regulated-area or grading requirements, so treat the following as general planning notes, not confirmed City requirements. Verify any applicable tree protection or grading rules with the City (for example, Urban Forestry for trees) early. Practically, a tree near the proposed footprint could affect where the building can go, and sloping or uneven grade may affect drainage around the suite. A different location can then collide with setbacks or fire access. These constraints interact, which is why considering them together is more reliable than one at a time.

When the lot points toward a custom design

A pre-approved plan is most attractive on a regular, generous lot with straightforward access. Consider a custom or adapted design when:

• The lot is irregular, narrow or sloped.
• The side yard is tight and fire access is difficult.
• A tree or easement occupies the logical building area.
• You want a layout or size that none of the four designs offers.

What happens if you modify the design

The City’s pre-review benefit applies to the plan used without modifications. Once you change it, the design is no longer simply pre-reviewed. We have not confirmed from the City’s published guidance who takes responsibility for modifications, so confirm with Toronto Building who must take responsibility for your specific changes and use a qualified designer for any modifications.

Fees, Development Charge Deferral and Budgeting Beyond the Free Plans

The plans are made available by the City, but the project still carries costs. The City publishes permit fees on a per-square-metre basis; its fee schedule for residential construction (Group C) lists rates per m2 by building type. We have not confirmed which category applies to a garden suite, so we do not quote a dollar figure here. Check the City’s current fee table on the pre-approved garden and laneway suite page to see which category applies and calculate your own figure.

The City also runs a Development Charges Deferral Program for Ancillary Secondary Dwelling Units, which allows development charges to be deferred for eligible property owners building a secondary dwelling unit at the rear yard of a property. Eligibility is determined through the City’s Laneway and Garden Suites program, so confirm your proposal qualifies before counting on it.

Beyond permit fees, the costs that pre-approved plans do not remove typically include a survey, the site plan and related drawings, servicing work, any fire access measures, tree-related work and construction itself. For a realistic budget framework, see what a garden suite costs to build in Toronto.

Is a Pre-Approved Plan Right for Your Lot? Decision Checklist and Next Steps

Use this checklist to decide before you spend money:

1. Survey: Do you have a current survey showing lot lines, easements and existing buildings?
2. Fit: Does one of the four designs fit your rear yard within the City’s quick-reference setbacks (understanding these are not a guarantee)?
3. Fire access: Can you identify an acceptable access route from the street to the suite?
4. Servicing: Do you know how water and sanitary will connect, and have you considered the effect on the main house?
5. Trees and grade: Are there trees, slopes or regulated features near the build area?
6. Design flexibility: Can you live with the design unmodified?
7. Budget: Have you priced permit fees, servicing, access measures and construction, and checked DC deferral eligibility?

If most answers are yes, a pre-approved plan can be a sensible shortcut. If several are uncertain, a feasibility review before choosing a path can prevent paying for the wrong design. Delvin Dream Homes helps Toronto-area owners assemble site-specific permit documents and check lot feasibility; see our Additional Residential Unit design and permit services for how we approach it.

If you want a clear read on whether a pre-approved plan works for your lot, request a quote and we can review the site constraints and the documents your permit application will need.