How Much Does a Secondary Suite Permit Cost in Toronto?

City of Toronto building permit fees for a secondary suite typically range from $3,000 to $8,000, calculated based on the project's construction value and square footage. Add permit drawings, structural engineering, and required inspections, and most homeowners spend $8,000 to $15,000 on the permit process alone. The exact amount depends on whether you're converting an existing basement, adding a garden suite, or creating a unit in an addition. Understanding these costs upfront prevents budget surprises and helps you plan a realistic timeline for your rental income goals.

How Toronto Calculates Permit Fees

The City of Toronto Building Department uses a formula based on construction value and floor area to calculate permit fees. For secondary suites, this means the larger your unit and the more extensive your renovations, the higher your fees. A basic basement conversion with minimal structural work costs less than a ground-up garden suite or a project requiring significant plumbing and electrical upgrades.

Toronto charges a base fee plus a per-square-metre rate that varies by project type. Secondary suites fall under residential alteration categories, which have different rates than new construction. The city also applies a Toronto Building surcharge and development charges in certain circumstances.

Fee Categories You'll Encounter

• Building permit fee: The core fee based on construction value, typically the largest single charge
• Plumbing permit fee: Required for any new bathroom, kitchen, or laundry connections
• HVAC permit fee: Applies when adding or modifying heating, ventilation, or air conditioning
• Zoning review fee: Charged when your application requires zoning confirmation or minor variance
• Plan examination deposit: A refundable deposit that covers initial review, credited toward final fees

Permit Drawing Costs

Before you can apply for a permit, you need professional drawings that meet Ontario Building Code requirements. These drawings show floor plans, elevations, structural details, and mechanical layouts. The City of Toronto won't accept hand sketches or incomplete plans, so this is a non-negotiable expense.

For a basement secondary suite, permit drawings typically cost between $2,500 and $5,000. Garden suites and more complex projects run higher, often $4,000 to $8,000, because they require more detailed architectural and site plan documentation. At PermitsHub, we provide fixed-price permit drawing packages so you know exactly what you're paying before we start.

What Your Drawings Must Include

• Existing and proposed floor plans with dimensions and room labels
• Building sections showing ceiling heights, window wells, and egress routes
• Electrical panel location and circuit layout
• Plumbing riser diagrams for new fixtures
• Structural details if any load-bearing walls are affected
• Site plan showing the unit location, parking, and setbacks

Engineering and Inspection Fees

Many secondary suite projects require a structural engineer's stamp, especially when you're underpinning a basement, removing load-bearing walls, or adding a garden suite. Structural engineering reports typically cost $1,500 to $3,500 depending on complexity. If your home was built before 1950 or has unusual construction, expect the higher end of that range.

The city also requires multiple inspections throughout construction, and while inspection fees are usually bundled into your permit cost, failed inspections can add delays and indirect costs. Some homeowners hire private inspection services to pre-check work before city inspectors arrive, adding $300 to $800 to the budget but potentially saving weeks of rework.

Hidden Costs That Catch Homeowners Off Guard

The permit fee itself is just one piece of the puzzle. Several other costs often surprise first-time applicants, and failing to account for them can derail your project budget.

• Zoning variance applications: If your property doesn't meet current zoning requirements, you may need a minor variance from the Committee of Adjustment, which costs $5,000 to $10,000 including application fees and legal or planning consultant support
• Fire separation upgrades: Secondary suites require specific fire ratings between units, which may mean replacing drywall, adding fire-rated doors, or installing interconnected smoke alarms
• Separate utility metering: While not always required, many landlords want separate hydro and gas meters, adding $1,000 to $3,000 in setup costs
• Parking requirements: Some areas require an additional parking space for the secondary suite, which could mean driveway modifications
• Development charges: In certain circumstances, the city applies development charges to secondary suites, though many are exempt under current policies

Basement Suite vs. Garden Suite Costs

Basement conversions generally cost less in permit fees because they involve renovating existing space rather than new construction. A typical basement secondary suite permit runs $3,000 to $5,000 in city fees. Garden suites, which are standalone structures in your backyard, involve new construction permits and often cost $5,000 to $10,000 in fees alone.

Garden suites also require more extensive drawings, including foundation plans, full building elevations, and detailed site plans showing setbacks and lot coverage. The engineering requirements are more involved, and you'll likely need a survey if you don't have a recent one. All told, garden suite permit-related costs often exceed $15,000 before you break ground.

Cost Comparison at a Glance

For a basement secondary suite, expect $2,500 to $5,000 in permit drawings, $3,000 to $5,000 in city fees, and $1,500 to $3,000 in engineering if structural work is involved. A garden suite typically requires $4,000 to $8,000 in drawings, $5,000 to $10,000 in city fees, and $2,500 to $4,000 in engineering and surveys. These ranges reflect projects in established Toronto neighbourhoods like East York, Scarborough, and North York where lot sizes and existing conditions vary significantly.

How to Reduce Your Permit Costs

While you can't negotiate city fees, you can control other expenses. Starting with accurate, complete permit drawings prevents revision cycles that add weeks and dollars. Choosing a permit specialist who knows Toronto's submission requirements means fewer rejections and faster approvals.

Bundling your permit drawings with your building permit application, rather than treating them as separate projects, also streamlines the process. Some homeowners try to save money by using generic drafting services, but drawings that don't meet Toronto Building's specific requirements end up costing more in revisions and delays.

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The cheapest permit drawing is rarely the fastest permit approval. Invest in quality upfront, and you'll save time and money throughout the project.

Timeline and When Fees Are Due

Toronto collects permit fees in stages. You'll pay a plan examination deposit when you submit your application, typically a percentage of the estimated total fee. Once your permit is approved, you pay the balance before receiving your permit. This means you need funds available at both submission and approval, which can be several months apart depending on review times.

Current review times for secondary suite permits vary based on application volume and completeness. Straightforward basement conversions with complete drawings often clear review faster than complex garden suite applications. Building your permit costs into your overall project financing ensures you're not scrambling for funds when approval comes through.