How Much Is My Duplex Worth in Ontario? (Income Approach vs Comparable Sales)

Why Standard CMA Undersells Duplexes

A standard Comparative Market Analysis (CMA) compares your property to similar properties that have sold recently. The problem with CMAs for duplexes: they often compare your property to single-family homes with in-law suites, which sell for different reasons to different buyers. Investor buyers don't buy on the CMA — they buy on the income approach.

Method 1: The Income Approach

The income approach values your property based on its earning potential. Formula: Value = NOI ÷ Target Cap Rate. Example: your duplex generates $28,000 NOI annually. In your market, comparable duplexes are trading at 6.5% cap rates. Value = $28,000 ÷ 0.065 = $430,769. If you can increase NOI through rent increases or expense reduction before listing, you directly increase this valuation.

Method 2: Comparable Sales (CMA)

Your listing agent will pull recent sales of legal duplexes (not single-family homes) in your neighbourhood. This tells you what buyers have actually paid — regardless of cap rate. The two values will often differ. In a strong market, the CMA may produce a higher value than the income approach (indicating speculative demand). In a normalized market, they should converge. Price at the higher of the two while ensuring your listing presents the income case clearly.

How to Maximize Your Valuation Before Listing

Three actions that directly improve your income approach valuation: 1) Raise rents to market at the next renewal opportunity — even a $200/month increase per unit improves your NOI by $4,800/year, adding $73,000 to your income approach value at a 6.5% cap rate. 2) Ensure all expenses are documented so buyers can trust your income statements. 3) Have the property legally verified — a confirmed legal duplex commands a premium over properties with ambiguous second unit status.

Getting a Real Number Fast

Option 1: Request a free seller's consultation from OntarioDuplex.com — we'll run both income approach and CMA and give you a realistic market value range. Option 2: Hire a licensed appraiser who specializes in income property — cost $400–$700 but produces a defensible, lender-ready valuation. Option 3: List with an agent experienced in duplex sales who can show you recent comparable sales and income approach calculations side by side.