How Much Is My Plex Worth? 3 Valuation Methods
Income approach, comparable sales, and replacement cost: the three ways to value an income property in Quebec. For a multiplex, it's net income that drives value, not the neighbourhood median price.
Income approach · Cap rate · GIM · APCIQ 2026 data
The value of a multiplex in Quebec is estimated using 3 methods: 1) the income approach (value = net operating income ÷ cap rate) — the most widely used for an income property; 2) comparison with recent comparable sales; 3) replacement cost. For a multiplex, net income drives value, not the neighbourhood median price.
You own a multiplex and want to know what it's really worth? The answer depends on which method you use — and for an income property, not all methods are equal. Investors, banks, and serious buyers rely primarily on the income approach, which anchors value in what the property actually generates, not in what the neighbours listed on MLS.
This page explains all three methods in detail — formulas, worked examples, and limitations — so you know exactly what your property is worth before making any decision.
How to value a multiplex: the 3 methods
Each method has its strengths and limitations. For a multiplex in Quebec, the income approach is the most relevant — here is why.
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Income approach (NOI capitalization)
This is the primary method for any income property. It estimates value by dividing the Net Operating Income (NOI) by a capitalization rate (cap rate).
Value = NOI ÷ Cap RateNOI is annual gross income minus all actual operating expenses (municipal and school taxes, insurance, maintenance, management, vacancy allowance) — but before debt service. The cap rate reflects the return investors expect for this type of property in this market.
When to use it: always, for a multiplex or any income property. This is the method used first by investor buyers, institutional lenders, and accredited appraisers.
Limitation: the quality of the result depends on the reliability of reported revenues and the choice of cap rate. A cap rate that is too low inflates the value; understated expenses do the same. Always verify actual income against leases in place.
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Comparable sales method (market comparables)
This method compares your property to recent sales of similar properties in the same area. It analyzes price per unit, price per square foot, or the gross income multiplier (GIM) of comparable transactions to derive a value range.
Value ≈ Gross income × Market GIM | North Shore GIM: 12–14×When to use it: as a complement to the income approach, to validate that your result is consistent with the market. Also useful when income data is incomplete.
Limitation: two identical plexes can be worth very different amounts if their net incomes differ. The comparable sales method ignores this key factor and can lead to significant over- or undervaluation for an income property.
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Replacement cost approach
This method estimates value by calculating what it would cost to reproduce the building new today (construction cost + land value), minus accumulated depreciation (age, condition, functional obsolescence).
Value = (Replacement cost − Depreciation) + Land valueWhen to use it: primarily for new or recently built properties, special-purpose properties without true comparables, or as an additional check. Rarely used alone to value an existing multiplex on the resale market.
Limitation: depreciation is difficult to estimate accurately for an aging property. This method does not account for the actual income potential of the property, making it the least relevant of the three for a residential income property.
Calculating a multiplex's value: a concrete example
A property with $60,000 in annual gross income and $24,000 in operating expenses. Here is what the income approach and the GIM method produce.
At a 4.5% cap rate, value rises to ≈ $800,000. At 5.5%, it falls to ≈ $655,000. The cap rate used depends on the local market and property type.
GIM is a quick approximation. It does not account for the actual expense ratio — two properties with the same gross income but very different expenses will have very different net values.
Both methods converge on a range of $720,000 to $780,000 for this property. The gap is explained by the fact that GIM does not account for the actual expense ratio (40% here). The income approach gives the most reliable result because it uses actual net income. Market data source: APCIQ, April 2026 (North Shore median plex price ≈ $763,500, cap rate 4.5–5.5%, GIM 12–14×).
The Income Method Step by Step
The income approach is not a black box — it follows a clear five-step sequence. Here is how to apply it to a real multiplex.
Step 1 — List all gross rents
Start with your actual in-place leases. Add every unit: residential leases (monthly rent × 12), commercial units if any, parking, storage, laundry income, and any other ancillary revenues. If you occupy one unit yourself, include a market-rate rent for that unit — an appraiser will normalize it regardless. Do not use projected or "potential" rents; use only what is contractually in place. For a 4-unit property on the North Shore, typical gross revenues range from $48,000 to $72,000 per year depending on unit size, neighbourhood, and lease vintage.
Step 2 — Apply a normalized vacancy rate
Even fully occupied today, a property is not realistically 100% occupied over the long run. Appraisers and sophisticated investors apply a normalized vacancy rate of 3% to 5% for multiplex properties in the Montreal area (APCIQ, 2026 data). On $60,000 in gross rents, a 4% vacancy provision reduces effective gross income to $57,600. If your property has actually been vacant above that norm — due to a difficult tenant, prolonged repairs, or other causes — document the reason; a buyer's appraiser will investigate.
Step 3 — List all operating expenses
Identify every recurring expense the property generates, whether you pay it or a manager does:
- Municipal and school taxes — typically 1.0%–1.6% of assessed value annually in Greater Montreal municipalities
- Building insurance — generally $1,500–$3,500/year for a 4–6 unit residential multiplex
- Maintenance and repairs — industry standard is 3%–5% of gross income for routine upkeep; older buildings trend toward the higher end
- Property management fees — 4%–8% of gross rents if outsourced; even if you self-manage, an appraiser will normalize a management cost of 5%–7% to reflect economic reality
- Replacement reserve — a provision (typically 2%–4% of gross income) set aside for major capital expenditures: roof, windows, HVAC, plumbing. It is not a cash outflow today, but it is a real future cost that informed buyers price in
Do not include mortgage payments, income taxes, or depreciation — those are below-the-line items that fall outside the NOI calculation.
Step 4 — Calculate NOI
Net Operating Income = Effective Gross Income − Total Operating Expenses. Using the example from the previous section: $57,600 effective income − $22,000 in normalized expenses = $35,600 NOI. This is the single number that drives value in the income approach. Any error here — understated expenses, inflated rents, missing vacancy provision — flows directly into the estimated value.
Step 5 — Select the market cap rate
The cap rate translates NOI into a capital value. It represents the return a typical investor expects for this type of property in this market, before financing. Based on APCIQ April 2026 data, cap rates on the Montreal North Shore cluster between 4.5% and 5.5% for 2–6 unit residential plexes. Newer buildings, superior locations, and long-term tenants in place trend toward the lower end (higher value); older stock, deferred maintenance, or below-market rents trend toward the higher end (lower value). Value = NOI ÷ Cap Rate. At 5.0%: $35,600 ÷ 0.05 = $712,000 (indicative, not a certified appraisal).
Adjustments That Change Your Property's Value
The raw NOI calculation is the starting point. These four factors regularly shift the final value by tens — sometimes hundreds — of thousands of dollars.
(a) Actual vs. normalized vacancy. If one of your units has sat empty for six months due to a dispute or renovation, your reported income is artificially low. An appraiser will normalize vacancy at market rates (3%–5%) and use that figure rather than your actual trailing twelve months. Conversely, if you have had unusually low vacancy thanks to long-term tenants, a buyer may apply the market norm regardless — expect pushback on above-average income claims. Example: a 10% actual vacancy rate on $60,000 in gross rents represents −$6,000 in effective income versus the normalized figure, translating to a −$120,000 swing in value at a 5% cap rate.
(b) Normalized expenses. If you self-manage and perform your own maintenance, your out-of-pocket expenses may look artificially low. An appraiser or investor buyer will add a normalized management fee of 5%–7% of gross rents — even if you never write that cheque — because the next owner may not self-manage. Similarly, if you have deferred maintenance for years and have unusually low repair bills, a buyer will add a realistic maintenance provision. The lesson: the value of a property is determined by normalized economics, not your personal cost structure.
(c) Physical condition and deferred maintenance. A $40,000 deferred maintenance deficit (roof nearing end of life, aging windows, old plumbing) can reduce your property's value in two ways: the buyer deducts the estimated cost directly, and may also push the cap rate higher to compensate for uncertainty. Combined, a $40,000 repair backlog can translate to a $60,000–$80,000 reduction in the agreed price. Major items that appraisers and buyers flag: roof (life expectancy and remaining years), windows (single vs. double glazing, condition), heating system, electrical panel (60-amp panels are uninsurable in many municipalities), plumbing (galvanized pipes), and foundation drainage.
(d) Below-market rents. Quebec's rental control framework means long-term tenants often pay substantially below current market rates. A unit renting for $800/month where market is $1,200 understates your NOI by $4,800/year — worth $96,000 in value at a 5% cap rate. Sophisticated buyers account for this as "deferred upside" and may pay a premium if turnover is likely, but lenders will underwrite only in-place income. Documenting lease dates and identifying units most likely to turn over can meaningfully affect how buyers model their offer.
| Factor | Example | Value impact at 5% cap |
|---|---|---|
| 10% actual vacancy vs. 4% norm | −$3,600 NOI | −$72,000 |
| Missing management fee (6%) | −$3,600 NOI | −$72,000 |
| $40k deferred maintenance | Direct deduction + cap rate pressure | −$60k to −$80k |
| 1 unit $400/mo below market | −$4,800 NOI | −$96,000 |
Figures are indicative examples, not a certified appraisal. Market data: APCIQ April 2026, North Shore.
Common Valuation Mistakes Owners Make
These six errors regularly cause owners to misread their property's market value — sometimes by six figures.
- Using the municipal assessment as the listing price. The municipal assessment (évaluation foncière) is a mass-appraisal figure produced by the municipality for tax purposes, updated every three years. It bears little relationship to current market value, especially for income properties where value is driven by NOI, not assessed square footage. In rising markets, properties routinely sell at 120%–160% of their municipal assessment.
- Omitting a vacancy provision. Presenting gross rents as if the building will be 100% occupied indefinitely overstates NOI and inflates the estimated value. Every serious buyer and lender will apply a normalized vacancy deduction. Build it in from the start for a realistic number.
- Not normalizing expenses. Listing only your actual out-of-pocket costs — especially when you self-manage or handle your own repairs — produces an artificially low expense total and an artificially high NOI. Buyers and appraisers will normalize a full management fee and a maintenance reserve whether you incur them or not.
- Overestimating potential rents. Projected rents — "the unit could rent for $1,400 once vacant" — are not in-place income. Lenders underwrite on current leases, not hypothetical future rents. Buyers will pay a premium for upside potential, but they will discount it for risk and time. Presenting pro-forma income as if it were in-place income misleads buyers and often collapses deals at due diligence.
- Confusing GIM and cap rate. A GIM of 13× and a cap rate of 5% on the same property tell very different stories. The GIM ignores expenses entirely; a property with a 13× GIM and a 60% expense ratio has a very different value profile than one with a 40% expense ratio. Using GIM alone to set your asking price can lead to significant mispricing.
- Ignoring deferred maintenance. Owners often mentally exclude repair costs from their valuation because "the building is functional." Buyers do the opposite — they itemize every deferred item and deduct it from their offer price, often with a contingency buffer. A proactive maintenance audit before listing puts you in control of that conversation.
Economic Value vs. Market Value
These two concepts are related but not identical — and understanding the gap between them often explains why a property sells above or below what the numbers suggest.
Economic value (also called intrinsic or income value) is a calculated figure: NOI divided by the market cap rate. It answers the question "what should this property be worth based on what it produces?" It is objective, reproducible, and anchored in the property's cash flows. The income method produces economic value.
Market value is what a willing buyer actually pays to a willing seller in an arm's-length transaction on a given date, with reasonable market exposure and no undue pressure on either party. Market value is shaped by economic value, but also by factors the income model does not capture: financing availability, buyer profile, supply and demand imbalances, seller motivation, and sentiment.
In practice, a property can trade above its economic value when an owner-occupant buyer is willing to pay a premium for the right to live in one unit — effectively subsidizing the purchase with personal housing value rather than pure investment logic. Strong seller's markets with limited supply compress cap rates below long-run norms, meaning buyers accept lower yields and prices exceed what the income alone justifies.
Conversely, a property can trade below its economic value when title issues, contentious tenant situations, unusual financing conditions, or a distressed seller force a discount. A building with a difficult tenant in place — arrears, ongoing TAL proceedings — will attract a smaller pool of buyers and a steeper discount than the income model suggests.
For owners, the practical implication is this: the income method gives you the most defensible anchor for your asking price, but the final transaction price will depend on who your buyer is and what conditions look like at closing. ImmoMulti's tools help you establish that anchor rigorously. These estimates are indicative and do not constitute a certified appraisal.
Why the neighbourhood median price is not enough
The neighbourhood median price (e.g., $763,500 on the Montreal North Shore, APCIQ April 2026) is a useful market reference point, but it does not reflect the specific value of your property. Two identical triplexes on the same street can be worth $650,000 and $820,000 respectively if their net incomes differ — one with below-market rents, the other with updated leases. For an income property, it is NOI ÷ cap rate that sets the value, not the sector median.
The median price is calculated across all transactions in the area, which includes properties with widely varying income profiles. A professional investor buyer will never look at the median without first analyzing the financial statements of the target property. This is why preparing a property income statement with real figures is the essential step before any sale or refinancing.
ImmoMulti's tools let you go further: the cap rate calculator gives you the implied cap rate from the price and NOI, the GIM comparison tool benchmarks your property against the market, and the NOI calculator details your expenses for a precise net income figure. You can also consult the North Shore plex price map and the city-by-city medians (North Shore 2026) to contextualize your property within its sector.
Multiplex valuation: your questions answered
The primary method is the income approach: Value = NOI ÷ Cap Rate. NOI (Net Operating Income) is the difference between annual gross revenues and actual operating expenses (taxes, insurance, maintenance, management, vacancy allowance) — before debt service. The cap rate reflects the return investors expect. On the Montreal North Shore, cap rates generally range from 4.5% to 5.5% based on APCIQ April 2026 data. Use our cap rate calculator and NOI calculator to get your figures quickly.
For an income property, the income approach is the most relevant and most widely used by investors, lenders, and accredited appraisers. It is grounded in the property's actual revenue-generating potential rather than neighbourhood median prices. The GIM method complements the analysis, but cannot replace the income approach for a multiplex because it ignores the actual expense ratio. The cost approach is rarely used alone to value an existing income property.
No. The neighbourhood median price (e.g., $763,500 on the North Shore, APCIQ April 2026) is a useful market reference, but does not reflect your property's specific value. Two identical plexes on the same street can be worth very different amounts if their net incomes differ — one with below-market rents, the other with updated leases. For an income property, it is NOI ÷ cap rate that sets the value, not the sector median. See our North Shore price map to benchmark your property.
NOI (Net Operating Income) is the difference between a property's gross revenues and its annual operating expenses. Operating expenses include municipal and school taxes, insurance, maintenance and repair costs, management fees, and vacancy provisions. Mortgage payments (debt service) are not included in the NOI calculation. Use our NOI calculator to detail your expenses and get a precise net income figure.
For a quick estimate, use the ImmoMulti tools: the cap rate calculator, the GIM comparison tool, and the NOI calculator. You can also receive a direct purchase offer — free and with no obligation — based on your property's actual net income. You will have a concrete figure in less than 48 hours, with no commission. Request your free offer →
The cap rate (capitalization rate) = NOI ÷ Price, where NOI is gross income minus all operating expenses. The GIM (Gross Income Multiplier) = Price ÷ Gross Rents — it does not account for expenses at all. The cap rate is more precise because it incorporates the actual expense ratio of the property. Two properties with the same gross income but different expense structures will have very different cap rates, yet the same GIM. For a rigorous income-property valuation, the cap rate is the preferred metric. Use our cap rate calculator and GIM comparison tool to run both figures side by side.
Deferred maintenance reduces a plex's value in two ways. First, a buyer will directly deduct the estimated cost of required repairs from the purchase price — a roof needing $25,000 in repairs can translate to a $40,000–$60,000 price reduction once risk and disruption are factored in. Second, the buyer may apply a higher cap rate to compensate for uncertainty and added risk, which further compresses the price. Major items to watch: roof, windows, electrical panel (60-amp panels are often uninsurable), plumbing, and foundation drainage. Addressing deferred maintenance before listing generally produces a better net outcome than negotiating a discount during the offer process.
Yes — you can estimate your property's value yourself using the income method and ImmoMulti's tools (NOI calculator, cap rate calculator, GIM comparison tool). This estimate is indicative and does not constitute a certified appraisal. For financing applications, litigation, estate planning, or a formal arm's-length sale, a written appraisal report from an appraiser who is a member of the Ordre des évaluateurs agréés du Québec (OEAQ) is required. An OEAQ-certified appraisal typically costs $800–$1,500 and carries legal weight.
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