Prórroga de plazo en Ontario

Extension of time in Ontario, at a glance

Ask the contract date first: Ontario runs three date-keyed regimes: before 1 July 2018, 1 July 2018 to 31 December 2025, and on or after 1 January 2026. They differ on whether adjudication exists at all and on whether time is adjudicable.
EOT became adjudicable on 1 January 2026: O. Reg. 264/25 s 19 makes a request for an extension of time adjudicable where reasonably necessary to a subsequent determination, but not on P3 projects, and not on contracts predating 1 January 2026.
The sentence that decides most files: In August 2026 nearly every Ontario project with a mature delay claim sits on a contract signed between 1 July 2018 and 31 December 2025, so EOT is still not adjudicable on it.
The limitation period may have been shortened: Ontario alone in Canada permits commercial parties to extend, shorten, suspend or wholly exclude a limitation period in a business agreement: Limitations Act, 2002, s 22(5)–(6).
Notice is a condition precedent: Strictly enforced, and the owner need not prove prejudice. A timely but thin notice is worth nothing: an inadequate claim is not a late claim, it is a non-existent claim.
But a staged-ADR period is not a bar: "Within thirty (30) days" in a staged mediation clause is a minimum, not a cut-off, J.P. Thomson, 2025 ONCA 378.
Money is no longer the owner's leverage: Prompt payment, mandatory annual holdback release and the repeal of s 27.1 have removed the owner's ability to sit on cash while a delay dispute runs.
Claims are decided at the gate or at enormous length: Elite lost CAD 4.1 million on summary judgment over a notice period. Walsh v TTC took a 161-day trial and CAD 165.925 million in claims to reach a delay finding.

Ontario has, in the space of eight years, become the most procedurally distinctive construction jurisdiction in Canada. It is the only place in the country where an extension of time can be adjudicated, the only place where a commercial contract may lawfully shorten or exclude a limitation period, and the only place with a body of adjudication-review case law at all. All three of those propositions carry conditions, and the first question on any Ontario delay file is not what happened on site. It is what date the contract was signed.

Beneath that procedural machinery, Ontario applies pan-Canadian doctrine: concurrency resolved by apportionment, the prevention principle from Perini Pacific, the two-limb penalty rule Canada never abandoned, and the Bhasin/Callow/Wastech good-faith line. Those are set out at extension of time in Canada, and this cluster does not repeat them. What follows is what is Ontarian.

A standing warning on the evidence base. CanLII, the Supreme Court portal, ontariocourts.ca and Ontario e-Laws all blocked automated retrieval during the research pass. No Ontario judgment and no consolidated Ontario statutory text was read in original form: statutory content came from enacting bill texts plus law-firm bulletins, and case content rests on bulletins. Every section number, day count and citation on this page and its spokes should be checked against the consolidated statute or the judgment before it is pleaded or relied on for a deadline-critical step.

Which regime is your contract on?

Ask this before reading anything else about an Ontario delay claim, because the answer changes whether adjudication exists, whether time can be adjudicated, and whether the owner still has a mechanism for holding cash.

Contract date	Regime	What it means for a delay claim
Before 1 July 2018	Former Construction Lien Act	No prompt payment. No adjudication. Litigation or contractual arbitration only
1 July 2018 – 31 Dec 2025	Construction Act, Parts I.1 and II.1	Adjudication available, but time is NOT adjudicable. s 27.1 still available to the owner
On or after 1 January 2026	The full 2026 regime	EOT adjudicable (non-P3), 90-day post-completion window, open s 13.5 scope, mandatory annual holdback release, s 27.1 repealed, 7-day published notice of termination

Layer: jurisdictional, statute. The transition turns on s 87.4, introduced by Bill 216 and amended by Bill 60, with a Ministerial power at s 88. Neither the consolidated statute nor the bills were read in original text for this corpus.

The consequence that decides most live files: in August 2026 nearly every Ontario project with a mature delay claim sits on a contract signed in the middle row, so an extension of time is still not adjudicable on it. The 2026 reforms are real and they are prospective. A contractor reading that time became adjudicable in January should check the execution date before building a strategy on it. Where the transition itself is in dispute, Caledon (Town) v 2220742 Ont. Ltd. o/a Bronte Construction 2024 ONSC 4555 applies the machinery.

An extension of time became adjudicable on 1 January 2026, with three conditions

O. Reg. 264/25 s 19 makes "a request for an extension of time to complete the work" an adjudicable matter under the Ontario Construction Act. No other Canadian jurisdiction has an equivalent. But it is narrower than it first reads, and each of the three conditions has defeated a referral before it started:

It is an ancillary head, not a free-standing one. Time is adjudicable where it is reasonably necessary to a subsequent determination: in practice, to a payment question. A referral seeking a declaration of entitlement to time and nothing else is exposed.
It does not apply to P3 projects. The corpus records that the exact provision effecting the P3 or special-purpose-entity exclusion could not be read, and that one firm notes certain P3 exemptions depend on the project agreement falling within types prescribed by regulation, with no such prescribing regulation issued as at that bulletin. Treat the boundary as live.
It does not apply to contracts entered into before 1 January 2026.

One drafting note: prefer s 19. A single firm refers to "s 19.1" while ODACC, the Ontario Association of Architects and other firms refer to s 19.

The review case law is worth knowing precisely because there is so little of it. Ledore Investments Ltd v Dixin Construction Ltd 2024 ONSC 598 (Div Ct) was the first successful judicial review of an adjudicator's determination in Canada, and it is a procedural fairness case, not a jurisdictional-error case: the adjudicator decided a dispositive issue neither party had raised. The underlying dispute was a delay set-off. Sayers Foods Ltd v Gay Company Ltd 2026 ONSC 918 (Div Ct) held that "complexity in the defences raised does not deprive an adjudicator of jurisdiction", the first Canadian delay dispute fought through adjudication and surviving review. The Sayers Foods neutral citation is unverified in this corpus. And because time was not adjudicable before 2026, Ontario's adjudicated-EOT case law is one case deep, with no prospect of a dataset: ODACC does not track delay, EOT or change-order disputes as a category. The prompt payment and adjudication page sets out the machinery, the day counts and the conflicts in them.

Ontario alone lets the contract shorten the limitation period

This is the sharpest divergence in Canadian construction law, and it is the one an out-of-province practitioner is least likely to check. Under the Limitations Act, 2002 s 22(3), (5) and (6), commercial parties to a "business agreement" (one in which no party is a consumer) may extend, shorten, suspend or wholly exclude a limitation period. "Vary" means all of those. So an Ontario owner's supplementary conditions can lawfully impose a one-year-from-substantial-performance bar on every delay claim, and it will bind. The identical clause in a Quebec contract is a nullity under art 2884 C.c.Q.. In Alberta, Saskatchewan and Manitoba only extension is permitted.

But drafting still decides it. Ontario (Transportation) v J & P Leveque Bros Haulage Ltd 2025 ONCA 573 reversed a finding that a ministry contract had validly substituted its own period, because the clause did not clearly describe the limitation period, identify its scope, and expressly exclude the statutory periods. All three, or the statute survives. Against that sits the basic two-year period from discovery, the four-limb s 5 test (including the limb people forget, whether a proceeding would be an appropriate means) and the fifteen-year ultimate period. The limitation periods page sets out accrual on a delay claim, which is invoice-and-default discoverability, and the point that negotiations do not toll.

Ontario has stripped owners of money as leverage

The 2026 regime completed a shift that began with prompt payment in 2019, and it changes the commercial dynamic of a delay dispute more than any doctrinal development has.

7 daysFor the owner to give written notice of a deficient invoice, silence deems the invoice proper and starts the 28-day payment clock

60–74 daysThe fixed 14-day window, opening on day 60 after publication, in which annual holdback must be paid

s 27.1 repealedThe owner's notice of non-payment of holdback is gone

Layer: jurisdictional: statute, on the 1 January 2026 regime only. No consolidated statutory text was read in original form.

Taken together: prompt payment, mandatory annual holdback release on contracts over a year, the owner's Form 6 obligation within 14 days of each anniversary, the repeal of s 27.1, and Sayers Foods confirming that a complex defence does not defeat adjudication. An owner can no longer respond to a delay claim by sitting on cash and waiting. The liens, holdback and security page sets out the mechanics, including whether an Ontario lien secures a delay claim at all. The short answer is partly, on a price-versus-damages line. What the trust provisions do not do is get a subcontractor past privity: in Tremblar Building Supplies Ltd v 1839563 Ontario Limited 2020 CanLII 6302 (ON SC) both the trust and unjust-enrichment claims against the owner were dismissed, the Act being a comprehensive scheme supplying the juristic reason.

Notice is a condition precedent, but a staged-ADR period is not

Ontario enforces contractual notice strictly, and under Technicore Underground Inc v Toronto (City) 2012 ONCA 597 the owner need not prove prejudice. Elite Construction Inc v Canada (Attorney General) 2021 ONSC 562, affirmed on appeal, shows what that costs: CAD 4.1 million dismissed on summary judgment over a 10-working-day notice. The appellate neutral citation is unverified in this corpus.

Content matters as much as timing. Ross-Clair v Canada (Attorney General) 2016 ONCA 205 is the sentence to memorise: "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 limit of the rule matters just as much, and it is recent. J.P. Thomson Architects Ltd v Greater Essex County District School Board 2025 ONCA 378 held that "within thirty (30) days" in a staged mediation clause is a minimum, not a cut-off. A provision that sequences dispute resolution is not a time bar, and a party facing a limitation-style argument built on an ADR ladder should read the clause again before conceding. Telling one from the other on the face of a clause is the work of the Ontario notice and time bars page.

Which contract are you on? The four Ontario regimes

The notice clock is not one clock. Ontario runs four distinct contract families and they differ on when the clock starts, what it starts from, and whether a letter counts.

Family	The extension clock	The trap
CCDC 2 – 2020 with OAA/OGCA supplementary conditions	10 Working Days from the commencement of the delay (GC 6.5.4), not from its effect	The industry package leaves GC 6.5 untouched, but SC 6.6.1 requires the money notice to go to the Consultant too, and SC 8.3.9–8.3.13 let the Consultant join the arbitration
IO / AFP Project Agreement	A tripartite split into Delay Event, Compensation Event and Relief Event	The Article numbers are not fixed, they differ between IO projects. Day counts are project-specific and were not surfaced. Never assume from CCDC or from another IO project
OPSS.MUNI 100 (November 2019)	15 Days BEFORE the Contract Time expires (GC 3.06.01)	It runs backwards from the end date. A claim clock also runs separately: verbal immediately, written intent in 7 Days, detail in 30, extendable to 90 (GC 3.13.03)
OPSS.PROV 100 (MTO, April 2023 edition): a separate document, not an edition of MUNI 100	"As soon as the need becomes evident" (GC 3.06), no day count	It must be on form PH-CC-756. A letter is not an application

Layer: form-default. Clause numbering rests on independent secondary sources. No form text was read in original. The executed contract and its supplementary conditions displace all of it, read them first.

Those forms are set out in CCDC 2 – 2020 with the OAA/OGCA Agreed-to Recommended Supplementary Conditions, in the OPSS.MUNI 100 (November 2019) General Conditions and the separately published OPSS.PROV 100 (April 2023 edition) MTO General Conditions, and in the Infrastructure Ontario project agreement architecture. Every deadline in all four, plus the adjudication, lien, holdback and limitation clocks, is collected on the Ontario delay claim clocks page.

Five clocks, and none of them saves any of the others

This is the organising idea of the whole Ontario cluster. A delay claim here runs five independent clocks with different triggers, different characters in law and different consequences for missing them.

Contractual notice, decides ENTITLEMENT

A condition precedent. Miss it and there is no claim to bring, whatever the merits.

Adjudication, decides FORUM

A statutory precondition to a statutory remedy, not a limitation period. Miss the 90-day post-completion window and you litigate instead.

Lien, decides SECURITY

Preservation at 60 days and perfection at 90, unchanged by the 2026 amendments. Miss it and you are unsecured, but you still have the contract claim.

Holdback, decides CASH FLOW

Now the owner's obligation, not something the contractor chases.

Limitation, decides WHETHER YOU CAN SUE AT ALL

Two years from discovery: and in Ontario, unlike anywhere else in Canada, the contract may have shortened it.

A preserved lien does not extend a notice period. An adjudication does not preserve a lien. A valid notice does not stop the limitation clock. There is one useful interaction worth knowing: because adjudication runs 90 days after completion and lien preservation runs 60, a contractor whose lien has expired can still commence an adjudication for 30 more days. A genuine tail, though starting an adjudication does nothing to preserve the lien.

What Ontario does not have

The gaps matter, because each one is an argument nobody has yet run, and an argument the other side can run just as easily.

No Ontario authority on the prevention principle or on time at large. The pan-Canadian anchor is a 1966 British Columbia case affirmed by the Supreme Court, and Ontario has not developed it. No Ontario decision on acceleration or on disruption and loss of productivity, 2022–2026, and no Ontario construction liquidated-damages decision at all for 2018–2026. The Ontario LD authorities are real-estate deposit, franchise and employment cases, and no Ontario decision adopts Cavendish. There is no source either way on whether Courts of Justice Act s 98 relief from forfeiture has been applied to a delay LD clause. No public judgment on Ontario Line delay exists. And no Ontario authority decides whether an arbitration clause ousts statutory adjudication. The scheme implies it cannot be contracted out of, since a party "may" refer and s 4 bars waiver, but no court has said so, and the question lands squarely on every IO/AFP project.

Two health warnings to close on. Castle Homes Design Inc v McKenzie 2026 ONCA 98 is a reminder that the Courts of Justice Act s 110 appeal route can be lost on procedure regardless of merit, so the forum decision deserves the same care as the claim. And do not cite 2505243 Ontario Ltd (Cachet Developments) v Silverwood. The corpus records that no such decision exists in the searchable record. The name appears to be a conflation, and it circulates.

Where Ontario does have authority, it is heavy. Schindler Elevator Corp v Walsh Construction Company of Canada 2021 ONSC 283 supplies the Canadian critical-path evidentiary standard, and Walsh Construction Company Canada v Toronto Transit Commission 2024 ONSC 2782 ran to a 161-day trial on CAD 165.925 million in claims to reach a binary 1,047-versus-411-day delay finding. That is the shape of an Ontario delay claim: it is decided at the gate on a notice point, or it is decided at enormous length. Very little sits in between.

Fuentes y jurisprudencia

Construction Act (Ontario) RSO 1990, c C.30, as amended with effect from 1 January 2026Ontario's lien, holdback, trust, prompt-payment and adjudication scheme. s 13.5 sets the open scope of adjudication and the 90-day post-completion window, s 13.12.1 requires a jurisdictional objection when first making submissions, s 13.18 is judicial review on leave, s 13.19 is amounts payable. Lien preservation and perfection remain 60 and 90 days. s 27.1, the owner's notice of non-payment of holdback, is repealed.No Canadian judgment or consolidated statutory text was read in original form for this corpus. Statutory content came from enacting bill texts and independent firm bulletins. Section numbers and day counts must be verified against the consolidated statute before any deadline-critical step.Buscar en CanLII →
O. Reg. 264/25 (Ontario Construction Act) s 19, in force 1 January 2026Makes "a request for an extension of time to complete the work" adjudicable as an ancillary head, where reasonably necessary to a subsequent determination. It does not apply to P3 projects, nor to contracts entered into before 1 January 2026.No consolidated regulatory text was read in original form for this corpus. One firm refers to "s 19.1" while ODACC, the OAA and other firms refer to s 19, prefer s 19. The exact provision effecting the P3 or special-purpose-entity exclusion could not be read. Verify against the consolidated regulation before relying on it.Buscar en CanLII →
Limitations Act, 2002 (Ontario) SO 2002, c 24, Sch B, ss 4, 5, 15, 22Two-year basic period from discovery (s 4) on the four-limb s 5 test including whether a proceeding would be an appropriate means, fifteen-year ultimate period (s 15), and s 22(3), (5), (6) permitting commercial parties to a business agreement to extend, shorten, suspend or wholly exclude a limitation period.No consolidated statutory text was read in original form for this corpus. The section numbers and their content rest on independent secondary sources. Verify against the consolidated statute before any limitation-critical step.Buscar en CanLII →
Technicore Underground Inc v Toronto (City) 2012 ONCA 597, Court of Appeal for OntarioStrict compliance with a contractual notice provision is required, and the owner need not prove prejudice from the failure to notify.No Canadian judgment or consolidated statutory text was read in original form for this corpus. The citation and holding rest on independent secondary sources. Verify on CanLII before pleading.Buscar en CanLII →
Elite Construction Inc v Canada (Attorney General) 2021 ONSC 562, affirmed on appealA CAD 4.1 million claim dismissed on summary judgment for failure to give notice within 10 working days.No Canadian judgment or consolidated statutory text was read in original form for this corpus, the citation and holding rest on independent secondary sources. The first-instance citation is 2021 ONSC 562, the appellate neutral citation is unverified, reported only in a court-of-appeal summaries digest. Verify on CanLII before pleading.Buscar en CanLII →
Ross-Clair v Canada (Attorney General) 2016 ONCA 205, Court of Appeal for OntarioFailure to provide sufficient information within 30 days after completion is a failure to provide notice of the claim at all.No Canadian judgment or consolidated statutory text was read in original form for this corpus. The citation and holding rest on independent secondary sources. Verify on CanLII before pleading.Buscar en CanLII →
J.P. Thomson Architects Ltd v Greater Essex County District School Board 2025 ONCA 378, Court of Appeal for Ontario"Within thirty (30) days" in a staged mediation clause is a minimum, not a cut-off. A provision that sequences dispute resolution is not a time bar.No Canadian judgment or consolidated statutory text was read in original form for this corpus. The citation and holding rest on independent secondary sources. Verify on CanLII before pleading.Buscar en CanLII →
Ontario (Transportation) v J & P Leveque Bros Haulage Ltd 2025 ONCA 573, Court of Appeal for OntarioA contractual limitation clause must clearly describe the period, identify its scope and expressly exclude the statutory periods. The Court reversed a finding that a ministry contract had validly substituted its own period.No Canadian judgment or consolidated statutory text was read in original form for this corpus. The citation and holding rest on independent secondary sources. Verify on CanLII before pleading.Buscar en CanLII →
Sayers Foods Ltd v Gay Company Ltd 2026 ONSC 918 (Divisional Court)"Complexity in the defences raised does not deprive an adjudicator of jurisdiction." The first Canadian delay dispute fought through adjudication and surviving judicial review.No Canadian judgment or consolidated statutory text was read in original form for this corpus. The citation and holding rest on independent secondary sources. The neutral citation is unverified. Verify on CanLII before pleading.Buscar en CanLII →
Ledore Investments Ltd v Dixin Construction Ltd 2024 ONSC 598 (Divisional Court)The first successful judicial review of an adjudication determination in Canada, decided on procedural fairness. The adjudicator determined a dispositive issue neither party had raised. The underlying dispute was a delay set-off.No Canadian judgment or consolidated statutory text was read in original form for this corpus. The citation and holding rest on independent secondary sources. Verify on CanLII before pleading.Buscar en CanLII →
Caledon (Town) v 2220742 Ont. Ltd. o/a Bronte Construction 2024 ONSC 4555 (Divisional Court)Applies the transition machinery determining which version of the Ontario construction legislation governs a given contract.No Canadian judgment or consolidated statutory text was read in original form for this corpus. The citation and holding rest on independent secondary sources. Verify on CanLII before pleading.Buscar en CanLII →
Castle Homes Design Inc v McKenzie 2026 ONCA 98, Court of Appeal for OntarioAn appeal-route warning under Courts of Justice Act s 110, taking a construction dispute down the wrong procedural road can cost the appeal irrespective of its merits.No Canadian judgment or consolidated statutory text was read in original form for this corpus. The citation and holding rest on independent secondary sources. Verify on CanLII before pleading.Buscar en CanLII →
Tremblar Building Supplies Ltd v 1839563 Ontario Limited 2020 CanLII 6302 (ON SC)A subcontractor's statutory trust and unjust-enrichment claims against the owner were both dismissed, the Act being a comprehensive scheme supplying the juristic reason. Ontario's trust provisions offer no route past privity.No Canadian judgment or consolidated statutory text was read in original form for this corpus. The citation and holding rest on independent secondary sources. Verify on CanLII before pleading.Buscar en CanLII →
Walsh Construction Company Canada v Toronto Transit Commission 2024 ONSC 2782, Ontario Superior Court of JusticeA 161-day trial on CAD 165.925 million in claims. Functional concurrency, delay-expert credibility, the critique-only trap producing a binary 1,047-versus-411-day outcome, and an award of acceleration costs.No Canadian judgment or consolidated statutory text was read in original form for this corpus. The citation, quantum and holding rest on independent secondary sources. The constructive-acceleration finding attributed to this judgment is single-source. Verify on CanLII before pleading.Buscar en CanLII →
Schindler Elevator Corp v Walsh Construction Company of Canada 2021 ONSC 283, Ontario Superior Court of JusticeThe leading Canadian concurrency authority, and the source of the Canadian critical-path evidentiary standard. The postponement must be broken into its component parts to apportion the time, responsibility and costs.No Canadian judgment or consolidated statutory text was read in original form for this corpus. The citation and holding rest on independent secondary sources. Verify on CanLII before pleading.Buscar en CanLII →
CCDC 2 – 2020, Stipulated Price Contract, with the OAA/OGCA Agreed-to Recommended Supplementary Conditions Canadian Construction Documents Committee, 2020 editionGC 6.5.4 requires written notice of delay within 10 Working Days of the commencement of the delay. GC 6.6.1 requires a separate, "timely" notice of intention to claim a change in the Contract Price. The Ontario industry-agreed OAA/OGCA package contains no supplementary condition amending GC 6.5. It does require the money notice to go to the Consultant, and lets the Consultant join a subsequent arbitration as a full party.No form text was read in original for this corpus. Clause numbering and content rest on independent secondary sources. Owners other than those adopting the industry package publish their own supplementary conditions and these almost always amend GC 6.5. Read the executed contract.CCDC →
OPSS.MUNI 100, General Conditions of Contract OPSS.MUNI 100, November 2019, GC 3.06.01, GC 3.13.03, GC 8.02.09OPSS.MUNI 100 GC 3.06.01 requires the extension application 15 Days before the Contract Time expires (a clock running backwards from the end date) and GC 3.13.03 requires verbal notice immediately, written notice of intent within 7 Days and the detailed claim within 30 Days, extendable to 90. A liquidated-damages clause sits at GC 8.02.09.No form text was read in original for this corpus. Clause numbering and content rest on independent secondary sources. The liquidated-damages clause at GC 8.02.09 exists but its text was not retrieved. This is the municipal document and is separate from OPSS.PROV 100, which is a different publication on a different revision cycle. Read the tender documents.MTO →
OPSS.PROV 100, MTO General Conditions of Contract OPSS.PROV 100, April 2023 edition, GC 3.06, GC 8.07OPSS.PROV 100 GC 3.06 requires the extension application "as soon as the need becomes evident", on form PH-CC-756. There is no day count. A liquidated-damages clause sits at GC 8.07.No form text was read in original for this corpus. Clause numbering and content rest on independent secondary sources. The liquidated-damages clause at GC 8.07 exists but its text was not retrieved. This is the provincial (MTO) document and is separate from OPSS.MUNI 100, which is a different publication on a different revision cycle. Read the tender documents.
Infrastructure Ontario / AFP Project Agreement Redacted execution-version agreements published by Infrastructure Ontario. Article numbering varies by projectIO project agreements run a tripartite architecture separating Delay Events, Compensation Events and Relief Events, rather than the single extension mechanism of a CCDC form.No project agreement was read in original for this corpus. The architecture is confirmed, but the ARTICLE NUMBERS ARE NOT FIXED across IO projects: in the Scarborough Advance Tunnel agreement Articles 31 to 33 are Variations, Delay Events and Compensation Events. In the New Toronto Courthouse they are Payment, Taxes and the Financial Model. Read the numbering off the specific agreement. The notice day counts were not surfaced, sit partly in the Articles and partly in the Schedules, and are project-specific. Read the specific project agreement, never assume from CCDC or from another IO project.Infrastructure Ontario →

Sobre este material El contenido de la biblioteca es información general sobre la práctica de las reclamaciones de construcción, no asesoramiento jurídico. El derecho a reclamar, los plazos y el procedimiento se rigen por su propio contrato y por el derecho del lugar donde se ejecuta la obra. Revisado el 8 de agosto de 2026 · Informar de una corrección