Photo: A legal secondary suite adds a self-contained rental unit to an existing home.

For years, adding a legal secondary suite in Calgary meant paying registration and development permit fees on top of construction costs , enough to make some investors skip the paperwork entirely. The City changed that with a fee amnesty program, and it has already been extended once. This time, the deadline is real: December 31, 2026. After that, the fees come back, and a separate $10,000 safety-upgrade grant that funded things like egress windows and smoke barriers has already moved to a waitlist, with funding expected to run out around September 2026. If you own a Calgary property with basement suite potential, this is the window.

What's Actually Ending

Calgary City Council's Secondary Suites Amnesty Program waives the registration and development permit fees that normally apply when you legalize an existing suite or build a new one. Council has extended this amnesty before, but the current deadline (December 31, 2026 ) is the one to plan around. Running in parallel, the City's $10,000 Secondary Suite Incentive Program helps cover safety-code upgrades (egress windows, fire separation, smoke and CO alarms). That program moved to a waitlist as of June 24, 2026, with funds expected to be exhausted by around September 2026. In short: the paperwork is free until year-end, but the cash grant is already running out.

The Numbers That Matter for Investors

A legal secondary suite in Calgary typically rents for $1,200 to $1,600 a month , a meaningful offset against a mortgage on a single-family home, and a way to turn one purchase into two income streams. The distinction that actually moves the needle for investors is legality: lenders will only count rental income toward mortgage qualification (your debt-service ratios) when the suite is registered and compliant. An undisclosed or unregistered suite might generate cash flow, but it does nothing for your financing capacity, and it exposes you to fines and insurance complications if something goes wrong.

What Actually Qualifies as "Legal"

A compliant secondary suite generally needs:

• Its own kitchen and bathroom, separate from the main unit
• A private entrance that doesn't pass through the primary residence
• Minimum ceiling height of 1.95 metres
• Egress windows in bedrooms that meet size and sill-height requirements for fire safety
• Working smoke and carbon monoxide alarms, and proper fire separation from the rest of the home

Before You Buy or Build: Check Zoning First

One wrinkle worth knowing about: Calgary's 2026 repeal of the 2024 citywide rezoning rolled back the maximum units allowed on most lots from four to three, which narrows the dual-suite math on some properties compared to a couple of years ago. If you're shopping for an investment property specifically for its suite potential, confirm current zoning and unit limits before you buy , not after. And if a listing already claims to have a "legal suite," verify it against the City's public secondary suite registry rather than taking the seller's word for it. An undisclosed suite can quietly undermine both your financing and your insurance coverage.

The Investor Bottom Line

Legalizing a secondary suite before the amnesty ends is one of the few moves in this market where the City is effectively subsidizing your due diligence. It adds a financeable income stream to a property you may already own, and it can widen the pool of properties worth considering if you're buying with a suite in mind. Whether you're formalizing an existing basement rental, evaluating a property for its suite potential, or weighing a build against the shrinking incentive window, the math is worth running now rather than in January.

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