ImmoMulti — a direct buyer of multi-unit properties on the North Shore — regularly sees plexes that look profitable on paper, only to choke the day the roof gives out. The remedy has a name: the capital reserve fund, or reserve for major work. In a small rental building, no law forces one on you the way it does in co-ownership — but going without it is playing roulette with your return. This guide explains why to build one, how much to set aside (as a percentage of income and per door), which items to plan for, and how to fold it honestly into your profitability calculation.
Why build a capital reserve fund in a small rental building?
Because a plex suffers the same wear as a condo (roof, windows, heating) with no co-owners to share the bill. The reserve fund smooths these large, spaced-out expenses instead of absorbing them all at once, and protects the building's long-term profitability.
In divided co-ownership, the Civil Code of Quebec requires the syndicate to hold a contingency (reserve) fund and, since 2024, to carry out a reserve fund study to set contributions. The legislator is acknowledging an unavoidable fact: a building ages and its components will be expensive to replace. Yet the owner of a wholly owned duplex, triplex or fourplex faces exactly the same wear — alone, with no legal framework forcing the issue.
That is precisely the trap. Because nothing requires them to provision, many small landlords live from rent cheque to rent cheque and have no reserve the day the roof membrane fails or the furnace dies. According to CMHC (Canada Mortgage and Housing Corporation), planned maintenance almost always costs less than emergency repairs forced on you at the last minute. The reserve fund is the tool that makes that planning possible.
What a reserve fund actually buys you
- Absorb a major job without a line of credit or emergency refinancing.
- Avoid deferring work — and so avoid worsening damage and losing value.
- Show a reassuring maintenance history to a future buyer.
- Calculate a realistic return rather than an optimistic one.
How much to set aside: percentage of income or amount per door?
There is no single magic number: the right provision depends on the age and condition of your building. Still, two prudent benchmarks, widely used in property management, give you a starting point.
1. As a percentage of gross income. A prudent range frequently used for maintenance and replacement sits between 5% and 10% of gross rental income per year. A recent, well-maintained building trends toward the low end; an older building with several components near end of life trends toward the high end.
2. Per door (per unit). Many investors prefer to reserve a fixed amount per unit per year, which forces you to think in terms of the number of units rather than income alone. That is useful when rents are below market and do not reflect the real cost of upkeep.
| Building profile | Indicative provision | Rationale |
|---|---|---|
| Recent plex, new components | Low end (~5% of gross income) | Few replacements in the near term |
| Mid-age plex, maintained | Middle of range (~7-8%) | A few aging items to anticipate |
| Pre-1990 building, components near end of life | High end (~10%+) | Roof, windows, foundation due soon |
Prudent ranges shown for guidance, drawn from recognized accounting practice for rental-building management. The exact amount must rest on your building's real condition. Sources: CMHC, APCHQ, CORPIQ.
Which major-work items should the fund cover?
A reserve fund is not a kitty for small routine repairs (a faucet, a bit of paint): it targets the major, costly and predictable components. Each has a known service life, which lets you estimate when the expense will land. The most structural items in a plex:
- Roof — elastomer membrane on a flat roof or asphalt shingles on a slope. Asphalt shingles often last 15 to 25 years depending on the product and installation; a well-laid membrane, sometimes longer.
- Windows and doors — replaced in batches, a heavy item in a multi-unit building.
- Heating and hot water — furnace, baseboards, heat pump, water heater: equipment with a limited service life and a costly replacement.
- Plumbing and electrical — electrical entrance, plumbing stacks, possible code upgrades.
- Envelope and structure — exterior cladding, weeping tile, foundation, balconies and stairs (safety).
According to the APCHQ (Quebec association of construction and housing professionals), planning the replacement of these components along their life cycle avoids both budget surprises and accelerated deterioration of the building. Note that work in a rental building may be subject to construction regulation; for contractor licensing requirements, refer to the Régie du bâtiment du Québec (RBQ).
How to build your reserve fund in 4 steps
The most rigorous method does not start from a percentage but from your actual building. Here is a simple routine to repeat each year.
- Inventory the major components and note the approximate age of each (roof, windows, heating, etc.). A pre-purchase inspection or a maintenance log helps enormously.
- Estimate the replacement cost of each component and its remaining service life. Cost ÷ remaining years = the annual provision to set aside for that item.
- Add up the provisions for all items: that is your target annual contribution. Compare it with the 5-10% of income range to sanity-check the order of magnitude.
- Ring-fence the money in a savings account or a liquid investment separate from the building's operating account, and keep a register of contributions and withdrawals.
Folding the reserve into your plex's profitability calculation
Treat the provision for major work as an operating expense, on par with taxes and insurance, before computing net operating income (NOI). An NOI that ignores the reserve artificially inflates the return and the stated cap rate.
This is the step most rushed buyers skip — and exactly why they overpay. When you subtract a realistic annual provision from your income, your net operating income (NOI) falls, and with it the capitalization rate (cap rate) the building truly delivers. It is uncomfortable but honest: a building that does not generate enough to maintain itself is not as profitable as it looks.
In practice, add a "reserve / major work" line to your income and expense statement. To quickly estimate your NOI and return with that line included, our guide to calculating a multiplex's return walks through the method, and the NOI calculator helps you crunch the numbers. Also check whether programs like energy renovation grants can reduce the cost of certain items.
Common mistakes to avoid
- Only provisioning "when there's money left." The reserve must be a planned expense, not an optional surplus.
- Mixing reserve and operating account. Without a separate account, the money gets spent elsewhere and the reserve exists only on paper.
- Leaving the reserve out of the purchase math. Buying on an NOI with no provision means overpaying.
- Underestimating invisible components. Weeping tile, foundation, plumbing stacks: the most expensive ones aren't visible to the naked eye.
- Deferring indefinitely. Deferred maintenance shows up at inspection and lowers the sale price; it never disappears, it gets worse.
Disclaimer
This guide is provided for information only. The ranges cited are prudent benchmarks and replace neither a professional assessment of your building's condition nor an accountant's advice on the tax treatment of your expenses. Always confirm the applicable regulatory requirements with the relevant authorities (RBQ, Revenu Québec).
