Preserve lien rights with Form 1 without retyping owner and contractor details

Owners, subcontractors, and suppliers preserving lien rights under the Construction Act repeat their legal name, project address, contractor identity, and contract details on every Form 1 notice to a contractor. This guide is an example of storing them once in hivi.

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 1 - Notice to Contractor Under Section 18 of the Act Construction Lien Act — cla-1

What this form is about

Form cla-1 is Form 1 — Notice to Contractor under section 18 of the Construction Act (formerly the Construction Lien Act), used in the lien preservation process on improvement projects — confirm deadlines and service rules on ontario.ca.

Before you start: what to gather

• Claimant's full legal name and business address.
• Contractor's legal name and address.
• Project or premises address and improvement description.
• Contract date and amount owing or disputed — confirm statutory particulars.

Confirm the current process on ontario.ca.

How hivi makes it faster

1. Save it once. Store your claimant and contractor names, addresses, and project location in your hivi profile.
2. Keep documents ready. Upload supporting documents to hivi Files so you are not searching at form time.
3. Autofill the form. Use the hivi Chrome extension on a web form, or fill a PDF from your saved profile inside hivi.
4. Review and submit yourself through the official channel.

Why do it in hivi

Related Ontario forms repeat the same personal details. Captured once in hivi — stored in Canada, with AI on its own servers — every form starts mostly complete.