Substantial performance
Also: Substantial completion, Certificate of substantial performance
Quick definition: The point at which the work is ready for use, or in use, for its intended purpose and the remaining work is below a threshold set by lien legislation; it starts the lien period and the release of holdback.
Explanation
Beginner explanation
Substantial performance means the building can be used as intended and only a small amount of work is left. In Ontario the law defines how small, as a percentage of the contract price.
Technical explanation
In Ontario, substantial performance is defined in the Construction Act by reference to readiness for use and to cost-to-complete thresholds expressed as percentages of the contract price (s. 2). The payment certifier (usually the consultant) certifies it on application by the contractor; publication of the certificate starts the lien period, after which the basic Holdback can be released. Under CCDC 2 (2020) the term takes its meaning from the applicable lien legislation, and certification of substantial performance is a mandatory condition of Ready-for-Takeover. Under the OAA/OGCA Take-Over Procedures, the warranty period generally starts at substantial performance. US contracts use "substantial completion", defined by contract rather than statute.
Practical example
An office fit-out reaches the stage where the tenant can occupy and the remaining work (minor finishes and deficiencies) is well under the statutory threshold. The architect certifies substantial performance, the contractor publishes the certificate, and the lien period begins the next day.
Why it matters
Substantial performance triggers money (holdback release), legal deadlines (lien periods) and, often, the warranty clock.
Common confusion
Substantial performance is not total completion. In Ontario, completion is a separate, later milestone with its own low threshold. It also differs from CCDC's contractual Ready-for-Takeover.
Standards and references
- OAA/OGCA Take-Over Procedures (Document No. 100). Ontario Association of Architects and Ontario General Contractors Association, 2019.Widely accepted professional interpretation
Supports: Substantial performance tied to readiness for use and percentage thresholds; certification, publication and 45-day lien period (CLA-era procedures); warranty generally from substantial performance · Status: Written under the former Construction Lien Act (reissued January 2019); check figures against the current Construction Act. - CCDC 2 2020 — CCDC 2 – 2020 Stipulated Price Contract. Canadian Construction Documents Committee (CCDC), 2020. Definitions.Original VDC Stack.io wording, based on the standard
Supports: Substantial Performance of the Work takes its meaning from applicable lien legislation · Status: Definitions and GC numbering reviewed from a copy included in a public tender package; confirm against a licensed copy. - R.S.O. 1990, c. C.30 — Construction Act, R.S.O. 1990, c. C.30. Government of Ontario. s. 2.Original VDC Stack.io wording, based on the standard
Supports: Statutory definition and thresholds · Status: Amended 2018–2019 (prompt payment and adjudication in force 1 October 2019). The e-Laws page could not be read by the research tools; section references need editor confirmation.
VDC Stack.io writes its own explanations and does not reproduce copyrighted standards text. Consult the cited standard for normative wording.
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VDC Stack.io. (2026). Substantial performance. In VDC Stack.io Knowledge Dictionary. Retrieved from https://vdcstack.io/dictionary/substantial-performance/