Mechanic's Lien Deadlines & Notice Requirements in Oklahoma

At a glance

Requirements one by one

Governing law

Oklahoma's mechanic's and materialman's lien law is Title 42, Chapter 3, "Mechanics and Materialmen" (§§ 141 to 150), with the civil-enforcement procedure in Chapter 5 (§§ 171 to 178). The current § 142.6 page includes a January 1, 2026 amendment to its criminal-penalty clause; its pre-lien notice periods remain in the text quoted below. Title 42 also contains a separate oil-and-gas well lien scheme in §§ 144-146 and a separate mining lien scheme in §§ 148-150. Both are outside this survey's ordinary private-building scope. The span §§ 144-149 is therefore not one scheme: § 144 begins oil-and-gas well liens, while § 148 begins mining liens. Section 171 begins the enforcement-procedure group; § 172 supplies the one-year filing-to-suit deadline used here.

Who can claim

Section 141 covers "any person" who, under an oral or written contract with the owner, performs labor, furnishes material, or leases or rents equipment for erecting, altering, or repairing a building or structure, and extends to planting trees or hedges and building fences, footwalks, or sidewalks. Section 143 gives subcontractors, including a person working "as an artisan or day laborer in the employ of the contractor," the identical lien "from the same time, in the same manner, and to the same extent as the original contractor," and extends the same protection one tier further to anyone furnishing material or labor to that subcontractor. Equipment lessors, covered by name in §§ 141 and 143, lose their lien rights entirely on certain property, see Homestead/residential extras below.

Preliminary notice

Section 142.6(B)(1) requires every claimant except the original contractor to send a written "pre-lien notice" to the last-known address of both the original contractor and the property owner, "no later than seventy-five (75) days after the last date of supply." One notice covers the whole project, the statute doesn't require sending a fresh one for every delivery. Two exemptions exist under subsection (B)(3): claims "in connection with a residential project" of four or fewer units where none are owner-occupied, and claims where the "aggregate claim is less than Ten Thousand Dollars ($10,000.00)." Neither exemption applies, however, if the property is "then occupied as a dwelling by an owner", there, the notice is mandatory regardless of the claim's size or the project's unit count. At filing, the claimant must also submit a notarized affidavit to the county clerk confirming compliance.

Deadline to file the lien

The deadline splits by contract position. Section 142 gives an original contractor "four (4) months after the date upon which material or equipment ... was last furnished or labor last performed" to file a verified statement with the county clerk. Section 143 gives a subcontractor, artisan, day laborer, or sub-subcontractor/supplier only "ninety (90) days after the date upon which material or equipment ... was last furnished or labor last performed under such subcontract" to do the same.

Notice of completion effect

Sections 142 and 143 state their filing periods from the claimant’s last furnishing of labor, materials, or equipment. The text of those deadlines does not use an owner-recorded notice of completion as the trigger.

Serving the lien on the owner

Unlike states where the claimant handles this step directly, § 143.1(A) puts it in the county clerk's hands: "Within five (5) business days after the date of the filing of the lien statement ... a notice of the lien shall be mailed by certified mail, return receipt requested, to the owner ... The notice shall be mailed by the county clerk." The claimant's job is simply to furnish the last-known addresses and pay the statutory fee. If the owner can't be located "with due diligence," § 143.1(B) lets the claimant, within 60 days of filing, serve an occupant of the property instead, or post a copy conspicuously on the property if it's unoccupied.

Deadline to sue to foreclose

Section 172 gives a claimant "one (1) year from the time of the filing of said lien with the county clerk" to bring a civil action enforcing it in district court. Section 172 supplies the one-year outside limit; it states no minimum waiting period before suit.

Homestead/residential extras

Two separate rules single out homestead and residential property. First, § 142.6(B)(1)'s pre-lien notice becomes mandatory, with none of the dollar-amount or small-project exemptions available elsewhere, for any lien affecting property "then occupied as a dwelling by an owner," and "no lien" on that property "shall be valid" without it. Second, and separately, § 143.3 strips an equipment lessor of lien rights altogether: the leased/rented-equipment lien "shall not apply to real property qualified for homestead exemption or real property used for agricultural purposes."

What trips people up

Claimants sometimes assume the $10,000 or non-owner-occupied exemptions in § 142.6(B)(3) let them skip the pre-lien notice on a small residential job, without realizing that if the owner actually lives in the home, neither exemption applies, the notice is mandatory regardless of the claim amount, and skipping it invalidates the whole lien, not just part of it. Separately, claimants sometimes assume they're responsible for mailing notice of their own filed lien to the owner, when in Oklahoma that's actually the county clerk's job under § 143.1, the claimant's real responsibility is making sure the clerk has a correct last-known address on file.

Common questions

I'm a subcontractor on a small job under $10,000, do I still need to send a pre-lien notice? A claim under $10,000 has its own exception under § 142.6(B)(3)(b). A residential project of four or fewer units with no owner occupant has a separate exception under (B)(3)(a). If the owner occupies the property as a dwelling, § 142.6(B)(1) requires notice regardless of claim size.

Do I need to mail notice of my lien to the property owner myself after filing? No. Under § 143.1, the county clerk mails that notice by certified mail within 5 business days of filing, using the address you furnish, you don't send it yourself unless the owner can't be found, in which case you may serve an occupant or post notice on the property within 60 days.

As an equipment lessor, can I file a lien on someone's homestead? No. Section 143.3 excludes leased or rented equipment liens from applying to real property that qualifies for the homestead exemption, or to agricultural property, regardless of the other lien rules.

Statutes and sources

• 42 O.S. § 141 — right to a construction lien — https://www.oscn.net/applications/oscn/DeliverDocument.asp?cite=42+O.S.+141 (accessed 2026-10-06).
• 42 O.S. § 142 — four-month original-contractor filing period — https://www.oscn.net/applications/oscn/DeliverDocument.asp?cite=42+O.S.+142 (accessed 2026-10-06).
• 42 O.S. § 143 — 90-day subcontractor filing period — https://www.oscn.net/applications/oscn/DeliverDocument.asp?cite=42+O.S.+143 (accessed 2026-10-06).
• 42 O.S. § 142.6 — 75-day pre-lien notice and exceptions — https://www.oscn.net/applications/oscn/DeliverDocument.asp?cite=42+O.S.+142.6 (accessed 2026-10-06).
• 42 O.S. § 143.1 — county-clerk notice after filing — https://www.oscn.net/applications/oscn/DeliverDocument.asp?cite=42+O.S.+143.1 (accessed 2026-10-06).
• 42 O.S. § 143.3 — equipment liens excluded on homestead and agricultural property — https://www.oscn.net/applications/oscn/DeliverDocument.asp?cite=42+O.S.+143.3 (accessed 2026-10-06).
• 42 O.S. §§ 144-146 — separate oil-and-gas lien track — https://www.oscn.net/applications/oscn/DeliverDocument.asp?cite=42+O.S.+144 (accessed 2026-10-06).
• 42 O.S. § 146 — oil-and-gas lien enforcement cross-reference — https://www.oscn.net/applications/oscn/DeliverDocument.asp?cite=42+O.S.+146 (accessed 2026-10-06).
• 42 O.S. §§ 148-150 — separate mining lien track — https://www.oscn.net/applications/oscn/DeliverDocument.asp?cite=42+O.S.+148 (accessed 2026-10-06).
• 42 O.S. § 149 — mining-lien suit deadline — https://www.oscn.net/applications/oscn/DeliverDocument.asp?cite=42+O.S.+149 (accessed 2026-10-06).
• 42 O.S. § 150 — mining-lien filing statement — https://www.oscn.net/applications/oscn/DeliverDocument.asp?cite=42+O.S.+150 (accessed 2026-10-06).
• 42 O.S. § 171 — assignment within the enforcement chapter — https://www.oscn.net/applications/oscn/DeliverDocument.asp?cite=42+O.S.+171 (accessed 2026-10-06).
• 42 O.S. § 172 — one-year enforcement-action period — https://www.oscn.net/applications/oscn/DeliverDocument.asp?cite=42+O.S.+172 (accessed 2026-10-06).