How to give a construction lien notice to a lien claimant (Form 4) — and autofill cla-4 with my-id.ca
Notify a lien claimant under subsection 19(3) without retyping party and project details
Owners or other parties giving notice to a lien claimant under subsection 19(3) repeat their identity, lien claimant name and address, and premises particulars on every Construction Act Form 4 notice. This guide is an example of storing them once in my-id.ca.
Official form and source
Start from the official source and always use the current version — form numbers and links can change:
- Service page: Construction Act — ontario.ca
- Form (Central Forms Repository): Form 4 - Notice to Lien Claimant Under Subsection 19 (3) of the Act Construction Lien Act — cla-4
What this form is about
Form cla-4 is Form 4 — Notice to Lien Claimant Under Subsection 19(3) of the Construction Act — confirm service rules on ontario.ca.
Before you start: what to gather
- Notifying party legal name and address for service.
- Lien claimant name and address.
- Premises or project address and improvement description.
- Contract and lien reference — confirm with counsel.
Confirm the current process on ontario.ca.
How my-id.ca makes it faster
- Save it once. Store your claimant and lien claimant business names and addresses in your my-id.ca profile.
- Keep documents ready. Upload supporting documents to my-id.ca Files so you are not searching at form time.
- Autofill the form. Use the my-id.ca Chrome extension on a web form, or fill a PDF from your saved profile inside my-id.ca.
- Review and submit yourself through the official channel.
Why do it in my-id.ca
Related Ontario forms repeat the same personal details. Captured once in my-id.ca — stored in Canada, with AI on its own servers — every form starts mostly complete.
Frequently asked questions
- When must a lien claimant be notified?
- Under subsection 19(3) in prescribed situations — confirm with counsel.
- How does my-id.ca help?
- It autofills business names and addresses across Construction Act notices.
- How is this related to cla-2 and cla-3?
- Forms cla-2 and cla-3 are notices to landlord and contractor; Form 4 is notice to the lien claimant.
Fill it once. Reuse it everywhere.
Save your information in my-id.ca once, then autofill this form and the next one — web forms with the Chrome extension, PDFs right in the app. Your data is stored in Canada and AI runs on my-id.ca's own servers, never sent to third-party AI providers.