Six provinces, six different lien clocks, and none of them run on the same day count from the same trigger date. A calendar built around one province's rule, applied everywhere, is a calendar that will miss a real deadline.
Key takeaways
STEP 01 OF 10
The starting mistake most lien calendars make is building a single template and reusing it across every project regardless of which province the work is in. Every province in this guide runs a genuinely different day count from a genuinely different trigger event. Build the calendar so the province is the first field entered for any project, before a single deadline is calculated, and let the province determine which set of rules the rest of the row uses.
Where a project spans more than one province — a pipeline or utility corridor, for instance — track each province's portion of the work against that province's own deadlines separately, rather than picking whichever province's clock is simpler to apply to the whole project.
STEP 02 OF 10
Ontario's Construction Act runs two deadlines from two different possible trigger events: preserve the lien within 60 days of the relevant trigger — publication of a certificate of substantial performance, completion, abandonment or termination of the contract, or the claimant's own last supply of services or materials, depending on position in the chain — then perfect within 90 days after the last day the lien could have been preserved, by commencing an action and registering a certificate of action on title (or the equivalent step where the lien attaches to holdback rather than land).
There is no relief for lateness — missing either deadline does not end the right to sue for the money owed, but it ends the lien's security. Calendar both dates the moment the trigger event is known, not just the first one.
STEP 03 OF 10
Ontario's 10 per cent statutory holdback used to be released at the payer's option. As of 1 January 2026, annual release is mandatory: the owner publishes a notice in the prescribed form within 14 days after each anniversary of the contract, and the money then flows down the chain at each tier. Calendar the contract's own anniversary date, not the calendar year end — Ontario's holdback release is contract-anniversary-based, which is a different trigger from the certificate-based mechanic used in BC and Alberta.
See holdback release, province by province for the fuller mechanics of this specific change — the shift from optional to mandatory annual release is recent enough that anything written from older knowledge is describing the previous rule.
STEP 04 OF 10
BC's Builders Lien Act runs on a certificate of completion, not on the two-step Ontario structure. A claim of lien may be filed no later than 45 days after the certificate of completion is issued (or after the head contract or improvement is completed, abandoned or terminated). Separately, the 10 per cent holdback period itself expires 55 days after the same certificate — a longer window than the 45-day filing deadline, which means the filing window closes before the holdback period technically ends. A lien not filed within the 45 days is extinguished outright under s. 22 — not merely weakened.
Filing is not the end of the process — s. 33(1) requires an action to enforce it, plus registration of a certificate of pending litigation, no later than one year from the date the lien was filed. Either party can shorten that window: an owner or another lien claimant may serve a notice to commence an action within 21 days of being served. Calendar all three BC dates — the 45-day filing deadline, the 55-day holdback expiry, and the one-year (or 21-day-if-served) enforcement clock — separately; and note BC has no “finishing holdback” the way Ontario does, so do not carry that basic-versus-finishing split into a BC row.
STEP 05 OF 10
Alberta's PPCLA s. 41 sets the general lien registration deadline at 60 days from the last day materials or services were furnished, or the contract was abandoned — but the same section sets a 90-day deadline specifically for oil or gas well or well-site work, and separately for improvements primarily related to furnishing concrete. A calendar that applies the 60-day figure to a concrete-specific supply is using the wrong number for that specific claim.
Alberta's holdback itself mirrors this same 60/90 split under s. 18: the general 10 per cent holdback runs 60 days from the certificate of substantial performance or completion, while oil-and-gas and concrete-related work again get 90 days. Calendar the trade or project category alongside the province, not just the province alone, for any Alberta row.
STEP 06 OF 10
PPCLA s. 33(4) defines substantial performance with an actual percentage test: work capable of completion or correction at a cost of no more than 3 per cent of the first $500,000 of the contract price, 2 per cent of the next $500,000, and 1 per cent of the balance. This is the one genuinely quotable percentage-based substantial-performance test in this entire guide — Ontario has no equivalent statutory percentage test, and Nova Scotia's is a flat 2.5 per cent rather than Alberta's banded structure. Do not transplant Alberta's test into an Ontario or Nova Scotia calendar row.
STEP 07 OF 10
Manitoba's Builders' Liens Act s. 24(1) sets holdback at 7.5 per cent, verbatim — the one province in this guide that breaks the otherwise-consistent 10 per cent pattern of Ontario, BC and Alberta. Lien registration runs 60 days under s. 43, the same figure as Ontario's preserve deadline and Alberta's general registration deadline, so it is easy to assume Manitoba matches those two provinces on both figures when it only matches on one.
s. 49(2) then gives a registered Manitoba lien two full years before an action must be commenced — materially longer than Ontario's 90-day perfection window or BC's one-year enforcement window — unless the owner serves notice under s. 50(2), which cuts that down to 30 days from service. Calendar the two-year default and flag it for the 30-day override the moment any notice is served.
STEP 08 OF 10
Nova Scotia's Builders' Lien Act runs a 10 per cent holdback with a distinct finishing holdback on top of it (unlike BC, which has none), a 2.5 per cent substantial-performance test (a different figure from Alberta's banded 3/2/1 structure), a 60-day registration deadline, and a 105-day perfection period. The single most common calculation error in Nova Scotia specifically is measuring the 105 days from the date of registration rather than from the last day of work — the two dates are not the same, and the gap between them is exactly the difference between a correctly calendared deadline and a missed one.
Enter both dates — last day of work, and date of registration — as separate fields on any Nova Scotia calendar row, and calculate the 105-day perfection deadline from the last-day-of-work field specifically, never from the registration field.
STEP 09 OF 10
Éducaloi states plainly that people who worked on a construction project have up to 30 days after the work is finished to publish a legal hypothec against the property — the mechanism securing payment where Quebec has no statutory holdback regime at all. Quebec's security is structural, not percentage-based: a notice published in the land register, not a dollar amount withheld by the payer.
Quebec's specific Civil Code article numbers for this mechanism could not be independently verified through a reachable public source for this guide, so none is stated here — calendar the 30-day window by name, citing Éducaloi, and confirm the specific article numbers with a Quebec notary or lawyer before relying on them in a filing.
STEP 10 OF 10
See finishing holdback vs. basic holdback and preserving versus perfecting a lien for the underlying definitions this calendar assumes are already understood. A calendar entry is only as reliable as the drafter's grasp of what “preserve” and “perfect” actually mean in the specific province the row is for — the two words do not mean the same thing in every province's statute.
Applying Ontario's 60/90-day structure to a BC or Alberta project. BC runs a single 45-day filing deadline against a 55-day holdback period; Alberta runs a 60-day registration deadline with 90-day exceptions for oil, gas and concrete. None of these map onto Ontario's two-step preserve-then-perfect structure.
Assuming 10 per cent holdback everywhere. Manitoba retains 7.5 per cent, not 10. A rate book or holdback tracker that assumes a universal 10 per cent misprices every Manitoba job by a real, computable dollar amount.
Calculating Nova Scotia's 105-day perfection period from the registration date. It runs from the last day of work, a different date from registration in almost every real project. This is the single most common calculation error this guide's sources flag for Nova Scotia specifically.
Transplanting Alberta's 3%/2%/1% substantial-performance test into another province. It is Alberta-specific. Ontario has no statutory percentage test at all; Nova Scotia's is a flat 2.5 per cent. None of the three provinces share the same figure.
Citing a Civil Code article number for Quebec's legal hypothec. No CCQ article number could be independently verified through a reachable source for this guide. State the 30-day mechanism by name and confirm specific article numbers with a Quebec notary or lawyer, rather than printing an unverified section number.
A single hypothetical last-supply-of-materials date, run through four provinces' actual deadline structures, for demonstration only — every date below is computed directly from the day counts and trigger events described in the steps above.
Ontario, starting from a February 1 last supply. Preserve by 60 days: April 2. Perfect by 90 more days after that: July 1. Alberta, the same February 1 last-supply date on general (non-oil-and-gas, non-concrete) work. Lien registration deadline at 60 days: April 2 — the identical calendar date as Ontario's preserve deadline, because both provinces happen to use the same 60-day count from a comparable trigger, even though what happens next (perfect by 90 more days in Ontario; nothing further required by that date in Alberta's registration step) is different.
Manitoba, the same February 1 last-supply date. Registration deadline at 60 days: April 2, again the same calendar date. But the action-commencement deadline runs two full years from registration, to April 2, 2028 — far past Ontario's July 1 perfection deadline on an identical starting date. Nova Scotia, using February 1 as the last day of work specifically. Registration by 60 days: April 2. Perfection at 105 days from the last day of work (not from registration): May 17 — a full six weeks past the 60-day registration date, and a deadline that a drafter who mistakenly counted 105 days from April 2 instead of February 1 would miscalculate by exactly those same six weeks.
Four provinces, the same starting date, four different final deadlines — and two of the four (Ontario and Alberta) happen to share one interim date by coincidence, which is exactly the kind of coincidence that makes a lien calendar's province field the most important entry on the row, not a formality.
Every figure below traces to the specific statute or regulator cited in the steps above — use this table as an index into the detail, not a replacement for reading the province's own row.
See lien deadlines across Canada for the companion article covering this same ground in narrative form.
No — the underlying contract claim survives a missed deadline. What is lost is the lien's security — the priority claim against the property or the holdback — not the right to sue for the money owed.
Manitoba's Builders' Liens Act s. 24(1) simply sets a different statutory rate, 7.5 per cent rather than the 10 per cent Ontario, BC and Alberta all use. There is no single “Canadian” holdback rate to default to.
No — the 105-day perfection period runs specifically from the last day of work, and calculating it from registration instead is the most frequently flagged error for Nova Scotia specifically.
No. Every province in this guide runs its own day counts from its own trigger events, and even provinces that happen to share a specific number — the 60-day figure recurs in several places — attach it to different trigger dates and different next steps.
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