Preliminary Notice Required

    Oklahoma Preliminary Notice Requirements for Contractors [2026]

    OK — 42 O.S. § 143

    Disclaimer: LienFlash is a document preparation platform, not a law firm. The statutory information below is provided for educational purposes and reflects state law as of 2026. Consult a qualified construction attorney licensed in Oklahoma for legal advice specific to your situation.

    Quick Facts

    Notice Required

    Yes

    Notice Type

    Preliminary Notice

    Statute

    42 O.S. § 143

    Deadline

    75 days from first furnishing

    Delivery Method

    Certified mail

    Key Fact: Oklahoma

    Oklahoma provides one of the longest preliminary notice windows at 75 days, but the requirement applies only to sub-subcontractors. Direct subcontractors are generally exempt.

    Understanding Oklahoma Requirements

    Oklahoma requires contractors, subcontractors, and material suppliers to file a Preliminary Notice to preserve their mechanics lien rights. Under 42 O.S. § 143, claimants must send this notice within 75 days from first furnishing to remain eligible to file a lien if payment disputes arise.

    Failing to send a timely Preliminary Notice in Oklahoma can result in the complete loss of your right to file a mechanics lien. This makes compliance with the 75 days from first furnishing deadline one of the most critical administrative tasks for any construction project in the state.

    LienFlash automates the Preliminary Notice process for states where we operate, handling document generation, CASS-certified address verification, and USPS certified mailing. When we launch in Oklahoma, you will be able to generate and send compliant notices in under two minutes.

    LienFlash is Coming to Oklahoma

    Join the waitlist to be notified when we launch automated preliminary notice filing in Oklahoma.

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