Construction lien deadlines vary sharply by province: Ontario gives 60 days from last work or completion to preserve a lien, British Columbia gives 45 days, Alberta gives 60 days for most work (90 for oil and gas sites), and Quebec's legal hypothec must be published within 30 days of the end of work. Miss the window and the right disappears entirely, no matter how much you are owed.
The provincial clocks
- Ontario: 60 days to preserve (register), then 90 more days to perfect it with a court action
- British Columbia: 45 days from completion, abandonment, or termination
- Alberta: 60 days general, 90 days for oil and gas well sites
- Quebec: the hypothèque légale de la construction must be published within 30 days of end of work
- Saskatchewan and Manitoba: 40 days and 60 days respectively
- Nova Scotia and New Brunswick: 60 days
Always confirm with the current statute or a construction lawyer; legislatures amend these periods, and "end of work" is itself a litigated definition.
What contractors get wrong about liens
The deadline is only the first trap. In practice liens disappoint for three reasons:
- Registering the lien is cheap, but enforcing it means a court action, with legal costs that regularly exceed a mid-size invoice
- A lien secures your claim against the property; it does not produce cash. Owners with no sale or refinancing planned can ignore it for years
- Paperwork technicalities (wrong legal description, missed holdback math, late perfection) kill a large share of liens before the merits are ever heard
Contractors who have actually used the system tend to say the same thing: the threat of a lien collects better than the lien itself, and neither works against a client who simply digs in.
The alternative: never need the lien
A lien exists because the work got ahead of the money. The prevention-side answer is structural: the client funds the contract into a neutral regulated account before work starts, and each completed stage releases its payment automatically. The final invoice cannot age past a deadline because it was never receivable in the first place. Banks have sold this protection to exporters for decades as letters of credit; software is finally making it accessible at renovation scale.