Substantial performance
Substantial performance is the point at which a project is sufficiently complete to be used for its intended purpose, even though minor work or deficiencies remain.
Also known as: Substantial completion · Substantial performance of the contract
Substantial performance is a defined moment, not a feeling. Reaching it usually triggers consequences: the start of a holdback release period, the running of lien timelines, and often a change in who carries responsibility for the building.
It is not the same as total completion. A house can be substantially performed while a punch list of deficiencies remains outstanding, and the two dates are frequently weeks or months apart.
Because the date carries legal weight, it is normally certified and published rather than assumed, and the record of what was complete when — dated logs, photographs, inspection sign-offs — is what supports it if the date is later disputed.
In Canada vs the United States
In Canada the test for substantial performance, the certification process and the publication requirements come from provincial construction or builders' lien legislation and differ between provinces. The American term for the broadly equivalent milestone is substantial completion. This is a general description, not legal advice — confirm the position in your province with your lawyer.
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