How Much Does a Secondary Suite Cost in Sudbury? (2026 Price Guide)

What Does a Secondary Suite Actually Cost in Greater Sudbury?

If you own a home in Greater Sudbury and you have been thinking about building a secondary suite, the first question is always the same: how much is this going to cost?

The honest answer is that it depends on the size of the unit, the condition of your basement, and the finishes you choose. But after building secondary suites across Sudbury, Chelmsford, Val Caron, and surrounding communities, we can give you real numbers based on what projects actually cost in this market - not Toronto prices, not national averages.

Here is what you can expect to pay in 2026 for a code-compliant, permit-approved secondary suite in Greater Sudbury.

Average Cost by Suite Size

These numbers include everything: permits, demolition, framing, plumbing, electrical, HVAC, fire separation, drywall, flooring, kitchen, bathroom, paint, and final inspections. They do not include furniture, appliances beyond basic stove and fridge, or landscaping for a separate entrance.

Cost Breakdown by Category

Understanding where your money goes helps you make smarter decisions about what to prioritize and where you can save. Here is how the budget typically breaks down on a one-bedroom suite in Sudbury.

Factors That Affect Your Total Cost

No two basements are the same. Here are the variables that push your project toward the higher or lower end of the range.

Separate Entrance

A dedicated exterior entrance is the single biggest cost variable. Cutting through a foundation wall, excavating a stairwell, pouring concrete, installing drainage, adding a landing, and fitting an exterior door will add $8,000 to $15,000 to your project. If your basement already has walkout access or a side entrance, you save that entire amount.

Ceiling Height

The Ontario Building Code requires a minimum ceiling height of 6 feet 5 inches (1.95m) in habitable rooms. If your basement floor-to-joist height is under that, you have two options: underpin the foundation ($30,000+) or lower the concrete floor ($15,000-$25,000). Both are major expenses that can make or break a project. If your ceiling is already at 7 feet or higher, you are in good shape.

Existing Plumbing Location

If your suite bathroom and kitchen line up directly below the main floor plumbing, the plumber can tie into existing drain lines at minimal cost. If the suite layout puts the bathroom on the opposite side of the house, you are looking at new drain runs through or under the concrete slab - adding $3,000 to $8,000 to plumbing costs.

Foundation Condition

Older homes in Sudbury sometimes have moisture issues, cracked foundations, or rubble stone walls that need addressing before finishing work can begin. If your foundation needs repairs, those costs are separate from the suite build and can add $5,000 to $20,000 depending on severity.

HVAC Approach

Extending your existing forced-air system with additional ductwork and a zone damper is the most affordable option ($4,000-$6,000). Installing a separate ductless mini-split system for the suite provides independent climate control but costs more ($6,000-$12,000). The Building Code requires that the suite have its own temperature control regardless of which approach you choose.

Smart Ways to Reduce Your Suite Cost

You do not have to cut corners to bring costs down. The biggest savings come from making smart design decisions early in the planning phase.

• Keep plumbing aligned with the floor above. Designing your suite kitchen and bathroom directly below the main floor plumbing saves $3,000-$8,000 in drain line work.
• Skip the separate entrance if possible. A shared interior entrance (with a fire-rated door) saves $8,000-$15,000. Greater Sudbury does not require a separate entrance for an additional residential unit - only the Building Code egress requirements need to be met.
• Choose standard finishes. Luxury vinyl plank instead of hardwood, laminate countertops instead of quartz, and standard white cabinets instead of custom - these choices can save $5,000-$10,000 without affecting livability or rental appeal.
• Extend existing HVAC. If your furnace has capacity, adding ductwork and a zone damper costs half as much as a new mini-split system.
• Use existing window openings. If your basement already has windows that meet egress size requirements (minimum 380mm x 760mm clear opening), you avoid the $2,500-$5,000 cost of cutting new ones.
• Plan the layout efficiently. A compact, well-designed bachelor unit at $50,000-$55,000 can generate nearly the same rental income as a sprawling one-bedroom at $85,000. Square footage does not always equal higher rent.

Financing Options for Sudbury Homeowners

Building a secondary suite is a significant investment, but there are government programs designed to help homeowners finance the cost. Here is what is currently available and what is coming.

CMHC 90% Refinance (Available Now)

This is the primary financing tool available to homeowners today. Since January 15, 2025, CMHC has allowed homeowners to refinance up to 90% of the post-renovation value of their home when building a secondary suite. The refinance is done through any CMHC-approved lender at current market mortgage rates.

Here is how it works: if your home is currently worth $400,000 and will be worth $475,000 after building the suite, you can refinance up to $427,500 (90% of $475,000). The difference between your existing mortgage balance and the new mortgage amount covers the construction cost. CMHC charges an insurance premium of 3.10% to 6.25% on the increased mortgage amount, depending on your loan-to-value ratio. You must get CMHC approval before starting construction, and funds are released through 4 construction draw payments at milestone stages.

Read our full guide: How to Finance Your Secondary Suite: Every Program Explained

Canada Secondary Suite Loan Program - CSSLP (Announced, Not Yet Available)

The federal government announced the CSSLP as part of its 2024 housing strategy - up to $80,000 at 2% interest over 15 years. However, as of mid-2025, the application process has not been posted and the launch timeline remains unclear. This program may still be worth watching, but it is not available for applications today. We will update this page when it launches.

Multigenerational Home Renovation Tax Credit (MGHRTC)

The MGHRTC allows you to claim 15% of up to $50,000 in eligible renovation expenses, for a maximum tax credit of $7,500. Important restriction: the renovation must create a secondary unit for a qualifying senior (65+) or an adult with a disability who will live in the unit. This is not a general-purpose secondary suite credit - if you are building a suite to rent to the general market, you do not qualify. This is a non-refundable tax credit claimed on your annual return.

Ontario Renovates

Ontario Renovates can provide up to $25,000-$30,000 in forgivable loans for creating secondary suites, administered through municipal housing services. Eligibility is income-tested and program availability varies by municipality. In Greater Sudbury, availability and current intake status should be confirmed with the City's housing services department. The forgivable component means you may not need to repay part or all of the loan if you meet the program conditions for the required period.

Available Funding Summary

For most homeowners today, the CMHC 90% refinance is the practical path to financing a suite build. If you have sufficient equity in your home, it can cover the full construction cost. The MGHRTC and Ontario Renovates can supplement this if you qualify, but each has specific eligibility restrictions.

ROI Analysis: Does a Secondary Suite Make Financial Sense?

The short answer: yes. Sudbury's rental market has tightened significantly over the past several years, and secondary suites are one of the most reliable ways to generate income from a property you already own.

Current Sudbury Rental Rates (2026)

Cash Flow Example: One-Bedroom Suite

Here is a realistic scenario for a $75,000 one-bedroom suite financed through the CMHC 90% refinance program.

• Build cost: $75,000
• Mortgage increase payment: ~$490-$560/month (at 5-6% over 25 years on the incremental $75K, plus CMHC premium)
• Rental income: $1,300/month (midpoint)
• Net cash flow: +$740-$810/month before expenses
• After insurance, maintenance, vacancy: +$430-$600/month net

That is roughly $5,200-$7,200 per year in net income. The suite also increases your property value - typically by 60-80% of the construction cost in the Greater Sudbury market. If the CSSLP launches with its announced 2% rate, the numbers improve further.

Sudbury vs. Other Ontario Markets

One advantage of building in Greater Sudbury is that construction costs are lower than in Southern Ontario, while rental demand is strong relative to supply. Here is how Sudbury compares.

Sudbury offers the best payback period in the province for secondary suites. Lower construction costs paired with solid rental demand mean your investment works harder here than almost anywhere else in Ontario.

What Happens Next

If you are considering a secondary suite, here is a practical first step: have someone look at your basement. Not every basement is a good candidate, and the sooner you know what you are working with - ceiling height, plumbing layout, foundation condition, electrical capacity - the sooner you can make an informed decision.

We offer free on-site assessments for homeowners in Greater Sudbury. We will walk through your basement, identify any challenges, give you a realistic cost range, and explain which funding programs you likely qualify for. No obligation, no pressure.