Ontario delay claim clocks

That is the whole of the page in one paragraph, and the rest of it is the detail: which clock, which trigger, which day count, and what a court will do about a miss. But the detail is conditional on one prior question, so the page starts there: which regime is the contract on? Ontario has three, they run simultaneously, and they are keyed to the contract date rather than to the date of the delay. The oldest of the three is the former Construction Lien Act, which still governs any Ontario contract entered before 1 July 2018 and supplies neither prompt payment nor adjudication.

A standing evidence warning applies to every number below. CanLII, the Supreme Court portal, ontariocourts.ca and Ontario e-Laws all blocked automated fetching when this corpus was built. No Canadian judgment and no Ontario statutory text was read directly from an official consolidated source. Statutory content came from enacting bill texts plus law-firm bulletins. Case content rests on bulletins. Where the corpus records two independent reputable secondaries agreeing, that is the highest confidence available here, and every day count on a limitation-critical step should be confirmed against the consolidated statute before it is diarised.

Which Ontario regime is the contract on?

Ask this before reading any deadline. Ontario runs three date-keyed regimes simultaneously, and the trigger is the date the contract was entered into, not the date the delay occurred or the date the claim is brought. The 2026 reform is prospective, and on the question that matters most to a delay claim (whether an extension of time can be adjudicated) it does not reach back.

Jurisdictional, and statutory. The three-regime structure rests on two independent secondary sources. No consolidated statutory text was read for this corpus. s 87.4 is the transition provision (amended by Bill 60 for project agreements) and s 88 gives the Minister transitional regulation-making power. Transitional jurisdiction is already being litigated.

In August 2026 nearly every Ontario project with a mature delay claim sits in the middle row. A claim ripe enough to be worth arguing about was almost certainly contracted before 1 January 2026, which means an extension of time is still not adjudicable on it. That is the single most useful sentence on this page, and it is the one most commonly got wrong in commentary written when the reform was announced.

Two further carve-outs narrow the new regime even where the contract date qualifies. Under O. Reg. 264/25 s 19: one firm cites the provision as s 19.1, while ODACC, the OAA and Cassels cite s 19, which is preferred. The extension-of-time head is available only where resolving it is "reasonably necessary" to a subsequent determination, so a pure EOT referral is still not available, and it does not apply to public-private-partnership project agreements with a special purpose entity at all. The largest Ontario projects, where delay claims run to eight figures, are precisely the ones the reform does not reach.

Clock A: contractual notice, and why it is the only one that decides entitlement

Contractual notice is the clock that decides whether there is a claim. Miss it and there is nothing left to adjudicate, lien or sue on. Ontario treats a notice-of-claim period as a condition precedent, strictly enforced, and the owner need not prove prejudice: Technicore Underground Inc v Toronto (City) 2012 ONCA 597. The day counts differ sharply between the four contract families in live use in the province.

Form-default, and edition-specific. Clause numbers and headings are confirmed against publicly available sources. No CCDC, CCA, OPSS or IO operative text was read in original form for this corpus. Bespoke amendment is normal and the executed contract governs, read the supplementary conditions before the general conditions. The IO Project Agreement day counts are recorded as UNVERIFIED: the three-way event classification is verified, but the periods sit partly in the Articles and partly in the Schedules and were not surfaced.

Three structural traps sit inside that table. First, CCDC 2 – 2020 GC 6.5.4 runs from the commencement of the delay, not from its effect. A contractor waiting to see how bad it gets has already lost the ten Working Days. Second, OPSS.MUNI 100 GC 3.06.01 runs backwards: the application to extend must be made at least 15 Days before the Contract Time expires, which is a structure no CCDC practitioner expects and which is easiest to miss on a job that is already visibly late. Third, OPSS.PROV 100 GC 3.06 imposes no day count at all but does impose a mandatory prescribed form. A contractor that writes a well-drafted letter instead of form PH-CC-756 has not applied for anything.

On an Infrastructure Ontario Project Agreement there is no standard answer at all. The Delay Event, Compensation Event and Relief Event classification is verified, but the Article numbers that carry it are not fixed and differ between IO projects, so read them off the agreement in front of you. The notice periods are UNVERIFIED and project-specific. They sit partly in the Articles and partly in the Schedules and were not surfaced for this corpus. Infrastructure Ontario publishes redacted execution-version Project Agreements, so the operative periods can be read out of the actual document. Never assume them from CCDC or from another IO project.

The subcontract chain compounds the problem rather than easing it. CCA 1 – 2021 gives a subcontractor 7 Working Days, three fewer than the main contract gives the contractor, so a subcontractor waiting to be told what the contractor intends to do will be out of time before the contractor is.

Content matters as much as timing. In Ross-Clair v Canada (Attorney General) 2016 ONCA 205 the Court of Appeal held that "failure to provide sufficient information within 30 days after completion is a failure to provide notice of the claim at all". An inadequate claim is not a late claim. It is a non-existent claim. The same strictness produced the outcome in Elite Construction Inc v Canada (Attorney General) 2021 ONSC 562, where a CAD 4.1M delay claim was dismissed on summary judgment for failure to notify within ten working days and affirmed on appeal. The appellate neutral citation 2021 ONCA 803 is unverified, reported in a digest rather than read.

One Ontario point cuts the other way, and it is worth knowing because it is not obvious: a period in a staged ADR clause is read as a minimum, not a cut-off: J.P. Thomson Architects Ltd v Greater Essex County District School Board 2025 ONCA 378. Ontario splits its rule of construction between the two kinds of time limit, and the fuller treatment of that split (together with what the standard forms do across jurisdictions) is in notice and time bars in Ontario.

Clock B: staged ADR, which is a floor rather than a ceiling

Staged ADR is the one clock that is not a bar. Both Ontario ladders: the CCDC 2 – 2020 Part 8 sequence and the OPSS.MUNI 100 GC 3.13.04 to GC 3.14.02 sequence: set periods that must elapse or be attempted before the next step, and under J.P. Thomson, 2025 ONCA 378, a period expressed as "within thirty (30) days" in a staged mediation clause is a minimum, not a cut-off.

Form-default. CCDC 2 – 2020 is current as at August 2026, with no 2025 or 2026 update. OPSS.MUNI 100 is the November 2019 edition. Clause numbers are confirmed from secondary sources and no operative text was read. The executed contract governs, and public owners routinely replace these ladders wholesale.

One Ontario-specific feature deserves separate attention because it changes who is in the room. On a CCDC 2 supplemented by the OAA/OGCA Agreed-to Recommended Supplementary Conditions, the Consultant may join the arbitration as a full party within 10 days of receipt, on 5 days' notice (SC 8.3.9–8.3.13). A two-party delay arbitration can therefore become tripartite at the Consultant's election, which affects pleading, privilege and settlement strategy from the outset. Note also that the same OAA/OGCA package contains no supplementary condition amending GC 6.5 at all: unusually for Canadian supplementaries, the Ontario industry-agreed package leaves the delay machinery alone.

The staged ladder interacts with limitation as well as with entitlement, and the interaction runs in the claimant's favour: a mandatory ADR step can postpone the start of the basic limitation period. That is Clock E's problem and is dealt with there.

Clock C: adjudication, a statutory precondition rather than a limitation period

Adjudication decides forum, not entitlement. Under the Construction Act a notice of adjudication must be given within 90 days after the contract is completed, abandoned or terminated (s 13.5(3)), and the parties may agree to extend that window. Miss it and the claim survives. It simply has to be litigated or arbitrated instead. The character of the clock is a statutory precondition to a statutory remedy, not a limitation period.

Jurisdictional, and statutory. No consolidated Ontario statutory text was read for this corpus. These section numbers and day counts come from enacting bill texts and firm bulletins. The CONFLICT on the two judicial-review and payment day counts is the highest-priority Ontario verification item in the corpus, and it is unresolved.

Note the correction that most commonly needs making about sections 13.18 and 13.19 of the Construction Act: s 13.18 is the judicial review provision (leave of the Divisional Court, closed grounds, applications that may be dismissed without reasons) and s 13.19 is "Amounts payable". Commentary that has them the other way round is wrong, and on this particular pair being wrong is expensive.

The jurisdictional-objection rule at s 13.12.1 is the trap a first-time referral respondent falls into. The objection must be taken when first making submissions, so a respondent that argues the merits first and the adjudicator's jurisdiction second has generally lost the point. And complexity is not itself a jurisdictional answer: Sayers Foods Ltd v Gay Company Ltd 2026 ONSC 918 (Div Ct), a neutral citation the corpus records as unverified, holds that "complexity in the defences raised does not deprive an adjudicator of jurisdiction".

Two negative findings belong here because they set the expectation a reader should have. First, before Sayers Foods no Ontario judicial review had addressed delay or extension of time at all: structurally, because time was not adjudicable before 1 January 2026. Ontario's adjudicated-EOT case law is one case deep. Second, ODACC does not track delay, EOT or change-order disputes as a category, so no Ontario dataset on adjudicated delay claims exists, and none can until the FY2026 report. Anyone quoting statistics on adjudicated delay outcomes in Ontario is quoting something that has not been measured. The scheme itself is set out at prompt payment and adjudication in Ontario.

One further question is expressly open: no Ontario authority decides whether an arbitration clause ousts statutory adjudication. The scheme implies it cannot be contracted out of. A party "may" refer, and s 4 bars waiver of the Act's provisions, but it has not been decided, and it affects every Infrastructure Ontario and AFP project, all of which contain bespoke arbitration regimes.

Clock D: liens and holdback, which decide security and cash flow

Lien and holdback decide security and cash flow, not entitlement. Lien preservation is 60 days and perfection is 90 days, and the 2026 amendments did not change either: Bill 216's lien-expiry proposal did not survive, so 2024–25 commentary describing a new Ontario lien regime is describing a dropped proposal. Missing the lien clock costs the security, not the claim: a contractor whose lien has expired retains the contract claim and can still sue.

Jurisdictional, and statutory. No consolidated statutory text was read for this corpus. The day counts rest on enacting bill texts and two independent secondary sources. The regime applies according to the contract date, so mandatory annual holdback release, the 7-day notice of termination and the repeal of s 27.1 reach only contracts entered on or after 1 January 2026, and P3 project agreements entered with a special purpose entity before 1 January 2026 are exempt from mandatory annual holdback release under s 87.4 as amended by Bill 60.

Section 27.1 is repealed. The owner's notice of non-payment of holdback (the mechanism an owner previously used to hold money against an asserted delay claim) is gone from 1 January 2026, and is still available only on contracts in the middle regime. Combined with prompt payment and with mandatory annual release, Ontario has systematically stripped owners of money as leverage against a delay claim. An owner that wants to withhold against delay now needs an express contractual delay-damages and set-off mechanism and has to prove it inside a 30-day adjudication.

Adjudication runs 90 days post-completion. Lien preservation runs 60. A contractor whose lien has expired can still commence an adjudication for 30 more days, but starting an adjudication does not preserve a lien.

That 30-day tail is the most useful arithmetic on this page, and it works in only one direction. It is a second chance at a forum, not a second chance at security. The practical rule is to preserve on the 60-day clock and adjudicate in parallel or in the tail, never to treat the adjudication window as covering the lien window.

One negative finding constrains what can be claimed here: there is no post-2018 Ontario appellate authority on the lienability of delay or prolongation costs. Whether, and to what extent, extended site overhead and prolongation costs are lienable in Ontario is unresolved at appellate level, and a practitioner asserting a lien amount that consists largely of delay costs is arguing an open point. The lien and holdback machinery in full is at liens, holdback and security in Ontario.

Clock E: limitation, which decides whether you can sue at all

Limitation is the clock that ends the claim rather than a remedy for it. The basic period is two years from discovery under section 4 of the Limitations Act, 2002, with the four-limb discoverability test at s 5: including the fourth limb, that "a proceeding would be an appropriate means" to seek to remedy the loss, and a 15-year ultimate period at s 15. What makes Ontario different from the rest of Canada is s 22(5)–(6).

Jurisdictional, and statutory. No consolidated statutory text was read for this corpus. The s 22 business-agreement power is Ontario's alone: Alberta, Saskatchewan and Manitoba permit extension only, and Quebec's art 2884 C.c.Q. permits no conventional prescription period at all, neither longer nor shorter. Do not extend the Ontario position to any other province.

Read the supplementary conditions for a limitation clause before you read anything else. In Ontario a commercial construction contract can lawfully cut the two-year period down, and s 22(5)–(6) of the Limitations Act, 2002 is why. That is not available in Alberta, Saskatchewan or Manitoba, where only extension is permitted, and it is flatly prohibited in Quebec. An English or Australian practitioner arriving on an Ontario job should treat the limitation period as a negotiated term until the contract says otherwise.

A shortened period is not, however, easy to draft. Under Ontario (Transportation) v J & P Leveque Bros Haulage Ltd 2025 ONCA 573 a contractual limitation clause must clearly describe a limitation period, identify its scope, and expressly exclude the statutory periods. On a Highway 60 rehabilitation contract the Court of Appeal reversed the motion judge and held that MTO's own clause failed that test, so the s 4 period governed and the action was not barred. If the province's standard form cannot get this right, an owner's bespoke supplementary conditions probably cannot either, and the clause is worth attacking.

On when the clock starts, accrual on an Ontario construction payment claim is invoice-and-default discoverability: 1838120 Ontario Inc v Township of East Zorra-Tavistock 2021 ONSC 3341: an invoice issued within a reasonable time, a reasonable payment period elapsed, and payment default. Negotiations do not toll. A contractor that spends eighteen months in commercial discussion with an owner has spent eighteen months of a two-year period, unless something else has postponed the start.

Something else sometimes does. Where the contract makes a dispute-resolution step mandatory, that step bears on the s 5(1)(a)(iv) question whether a proceeding would be an appropriate means, PQ Licensing S.A. v LPQ Central Canada Inc 2018 ONCA 331, so a mandatory staged ADR clause of the kind at Clock B can postpone the start of the basic period. That is a real argument, not a hopeful one, but it depends on the clause being mandatory rather than permissive.

Two things are unresolved and should be treated as such. There is no bright-line Ontario accrual rule for delay claims (not the delaying event, not substantial performance, not the final certificate) so accrual is argued case by case on the s 5 test. And it is undecided whether a contractual limitation clause valid under s 22 can cut down or extend the 90-day adjudication window: logically s 13.5(3) is a precondition rather than a limitation period, but the express statutory power to extend that window by agreement invites the argument. The fuller analysis is at limitation periods and claim accrual in Ontario.

What each clock actually decides, and how to run all five

Each clock answers a different question, and the answers do not substitute for one another. Set against each other they produce a short operating rule: notice decides entitlement, adjudication decides forum, lien decides security, holdback decides cash flow (and it is now the owner's obligation) and limitation decides whether you can sue at all.

Inferential. The characterisations are drawn from the authorities and the statutory scheme recorded in this corpus, not from any single judgment stating them in this form. Every underlying citation and section number rests on secondary sources.

Two points of context close the picture. The pan-Canadian doctrine these clocks sit on top of (concurrency, the prevention principle, the penalty rule, delay analysis and expert evidence) is not Ontario-particular and is set out in the Canadian extension-of-time hub. The Ontario material that sits above these clocks, including the four contract families and the three-regime transition, is at the Ontario extension-of-time hub. And Quebec is carved out of all of it: it is a civil-law jurisdiction, prescription runs three years from fin des travaux, and art 2884 C.c.Q. forbids any conventional period, in either direction. Nothing on this page should be carried across that border.

À propos de ce contenu Le contenu de la bibliothèque est une information générale sur la pratique des réclamations de construction, et non un avis juridique. Le droit à réclamation, les délais et la procédure sont régis par votre propre contrat et par le droit du lieu où les travaux sont exécutés. Révisé le 8 août 2026 · Signaler une correction