Oklahoma Pre-Lien Notice & Mechanic's Lien — 42 O.S. § 142.6 / § 143 / § 143.1 / § 172 County Clerk Filing Guide (2026)
✓ Verified against Oklahoma statutes · Reviewed August 2026 · By Michael Evan — Founder · 50 states · 799 rules
Oklahoma mechanics lien deadlines at a glance
Preliminary Notice
None — N/A
Mechanics Lien
4 months — From last date of furnishing
Enforcement
1 year — From filing
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What Is the Oklahoma Pre-Lien Notice Framework and How Does the Lien Workflow Operate?
Oklahoma's mechanic's lien framework is codified at 42 O.S. § 141 et seq. (the Oklahoma Mechanics' and Materialmen's Lien Act). The framework operates as a four-gate workflow with a sub-tier Pre-Lien Notice obligation triggered by claim size and project type. (1) Sub-tier claimants whose aggregate claim is $10,000 or more, or who furnish labor or materials for the original construction of 1-2 family residential property regardless of claim size, send the 42 O.S. § 142.6 Pre-Lien Notice to the owner and the original contractor by certified mail return receipt requested (or hand delivery) within 75 days after last furnishing. (2) The original (general) contractor files the 42 O.S. § 142 Mechanic's Lien Statement with the county clerk within 4 months after last furnishing; every sub-tier claimant files the 42 O.S. § 143 Mechanic's Lien Statement within 90 days after last furnishing. (3) Within one business day after filing, the claimant mails the 42 O.S. § 143.1 Notice of Lien Statement to the owner by certified mail return receipt requested. (4) The claimant commences the 42 O.S. § 172 foreclosure suit in the Oklahoma District Court for the judicial district where the property is located within 1 year after filing, with a lis pendens.
Who Must File an Oklahoma Mechanic's Lien Under 42 O.S. § 142 and § 143?
Under 42 O.S. § 141, every person performing labor upon or furnishing materials, equipment, or services for the erection, alteration, or repair of any building, structure, or other improvement to real property in Oklahoma holds a lien upon the property. The lien rights extend to original (general) contractors, subcontractors, sub-subcontractors, material suppliers, equipment lessors, design professionals, and laborers. Oklahoma has NO statewide general-contractor licensing requirement — general contracting is regulated only at the municipal level (Oklahoma City, Tulsa, Norman, Lawton, Broken Arrow, Edmond, Moore, Midwest City, Enid, Stillwater, Muskogee, Bartlesville). Specialty trades ARE state-regulated through the Oklahoma Construction Industries Board (CIB) under 59 O.S. § 1000.1 et seq. (plumbing, electrical, mechanical/HVAC) and roofing contractor registration under 59 O.S. § 1151.1 et seq., with the unlicensed-contractor compensation bar applicable to specialty work performed without the required CIB license.
42 O.S. § 142.6 Pre-Lien Notice: The 75-Day Sub-Tier Threshold Notice
Under 42 O.S. § 142.6, any claimant other than the original contractor whose aggregate claim is $10,000 or more — or who furnishes labor or materials for the original construction of 1-2 family residential property regardless of claim size — must send a Pre-Lien Notice to the property owner AND the original contractor by certified mail return receipt requested (or hand delivery) within 75 days after last furnishing. Failure precludes a valid mechanic's lien for amounts furnished more than 75 days before the late notice. The § 142.6 trap is the single most common cause of forfeited Oklahoma sub-tier liens because the $10,000 commercial threshold kicks in mid-project — by the time the aggregate claim crosses $10,000, the 75-day clock from the FIRST late invoice has often already run on partial furnishing. The safer practice is to send the § 142.6 Pre-Lien Notice on every Oklahoma sub-tier project at first furnishing.
42 O.S. § 142 / § 143 Mechanic's Lien Statement: The Split Filing Window
Under 42 O.S. § 142, the original (general) contractor in direct contract with the owner files the Mechanic's Lien Statement with the county clerk of the county in which the property is located within 4 months after last furnishing. Under 42 O.S. § 143, every sub-tier claimant files the Mechanic's Lien Statement within 90 days after last furnishing. The Mechanic's Lien Statement must be verified by oath and must include claimant name and address, owner of record, contracting party, sufficient property description with legal description from the county clerk's records, itemized statement of labor / services / equipment / materials, dates of first and last furnishing, and amount due after just credits and offsets. Oklahoma has 77 counties; filing in the wrong county is a fatal recording defect at the § 172 foreclosure stage.
42 O.S. § 143.1 Notice of Lien Statement: The One-Business-Day Post-Recording Cliff
Under 42 O.S. § 143.1, within ONE (1) business day after the Mechanic's Lien Statement is filed with the county clerk, the claimant must mail a Notice of Lien Statement to the property owner by certified mail return receipt requested at the owner's last-known address. The Notice of Lien Statement must include a copy of the recorded Mechanic's Lien Statement plus a brief explanation of the lien being claimed. Failure renders the lien unenforceable against the owner — Oklahoma's most operationally dangerous lien-timing trap because one business day leaves no margin between the courthouse filing and the post office. The safer practice is to file and mail the same day, eliminating the § 143.1 cliff entirely.
42 O.S. § 172 One-Year Foreclosure Window and Oklahoma's 77 Counties / 26 Judicial Districts
Under 42 O.S. § 172, the Oklahoma mechanic's lien continues for 1 year from the date the Mechanic's Lien Statement is filed; foreclosure must be commenced in the Oklahoma District Court for the judicial district in which the property is located within that 1-year window, with a lis pendens. If foreclosure is not commenced within 1 year, the lien is extinguished by operation of law. Oklahoma's 1-year window aligns with NY (N.Y. Lien Law § 17), IL (770 ILCS 60/9), and FL (Fla. Stat. § 713.22) — materially shorter than NM (2 years) and MT (2 years), but longer than WA (8 months), AZ / NV / AK / ID (6 months), WY (180 days), OR (120 days), CA / MA (90 days), and HI (3 months). Oklahoma has 77 counties grouped into 26 judicial districts. On Oklahoma public works exceeding $50,000, no private lien attaches — pursue the prime's payment bond under the Oklahoma Mini Little Miller Act at 61 O.S. § 1 et seq. On federal projects (Tinker AFB — Air Force Sustainment Center, the largest single-site Air Force logistics complex; Vance AFB; Altus AFB; Fort Sill — U.S. Army Field Artillery School; McAlester Army Ammunition Plant; Ouachita National Forest; Chickasaw NRA; Washita Battlefield NHS; Oklahoma City National Memorial; BIA holdings; 39 federally recognized tribal Indian Trust holdings — with McGirt v. Oklahoma 2020 jurisdictional analysis on eastern Oklahoma matters), pursue the federal Miller Act payment bond under 40 U.S.C. § 3131 et seq.
Frequently Asked Questions
Does Oklahoma require a pre-lien notice before filing a mechanic's lien?
Yes — for sub-tier claimants whose aggregate claim is $10,000+ or who furnish labor or materials for the original construction of 1-2 family residential property. Under 42 O.S. § 142.6, the Pre-Lien Notice must be sent to the owner AND the original contractor by certified mail return receipt requested (or hand delivery) within 75 days after last furnishing. Failure precludes a valid mechanic's lien for amounts furnished more than 75 days before the late notice. Original contractors in direct contract with the owner are exempt; sub-tier claimants on non-residential commercial projects under $10,000 aggregate are exempt.
When must the Oklahoma Mechanic's Lien Statement be filed?
Oklahoma applies a split window. Under 42 O.S. § 142, the original (general) contractor files with the county clerk within 4 months after last furnishing. Under 42 O.S. § 143, every sub-tier claimant files within 90 days after last furnishing. The clock runs from THIS claimant's last furnishing — not from project-wide completion. Filing in the wrong Oklahoma county is a fatal recording defect at foreclosure — Oklahoma has 77 counties.
What is the 42 O.S. § 143.1 one-business-day Notice of Lien Statement?
Within one business day after the Mechanic's Lien Statement is filed with the county clerk, the claimant must mail a Notice of Lien Statement to the property owner by certified mail return receipt requested at the owner's last-known address. Failure renders the lien unenforceable against the owner — Oklahoma's most dangerous post-recording trap because one business day leaves no operational margin. The safer practice is to file and mail the same day.
Where is the Oklahoma Mechanic's Lien Statement filed?
With the county clerk of the county in which the property is located. Oklahoma has 77 counties — Oklahoma County (Oklahoma City — state capital, Tinker AFB, largest construction market), Tulsa County (Tulsa — energy-industry hub), Cleveland County (Norman — University of Oklahoma), Comanche County (Lawton — Fort Sill), Canadian County (El Reno), Rogers County (Claremore), Wagoner County, Garfield County (Enid — Vance AFB), Payne County (Stillwater — Oklahoma State University), Washington County (Bartlesville — Phillips 66 legacy), Pittsburg County (McAlester — McAlester Army Ammunition Plant), Osage County (Pawhuska — Osage Nation, largest by area), and 65 others.
How long does an Oklahoma mechanic's lien last after filing?
Under 42 O.S. § 172, the lien continues for 1 year from the date the Mechanic's Lien Statement is filed; foreclosure must be commenced in the Oklahoma District Court for the judicial district where the property is located within that 1-year window, with a lis pendens. If foreclosure is not commenced within 1 year, the lien is extinguished by operation of law. Oklahoma's 1-year window aligns with NY, IL, and FL. Oklahoma has 26 judicial districts.
Does Oklahoma require general-contractor licensing before filing a mechanic's lien?
No at the STATE level. Oklahoma has NO statewide general-contractor licensing requirement — general contracting is regulated only at the municipal level (Oklahoma City, Tulsa, Norman, Lawton, Broken Arrow, Edmond, Moore, Midwest City, Enid, Stillwater, Muskogee, Bartlesville). Specialty trades ARE state-regulated through the Oklahoma Construction Industries Board (CIB) under 59 O.S. § 1000.1 et seq. — plumbing, electrical, mechanical (HVAC), and roofing contractors must be CIB-licensed.
How does Oklahoma handle public works and federal projects?
No private mechanic's lien attaches to public property. On Oklahoma state, county, municipal, and school-district public works exceeding $50,000, pursue the prime's payment bond under the Oklahoma Mini Little Miller Act at 61 O.S. § 1 et seq. On federal projects (Tinker AFB — Air Force Sustainment Center, the largest single-site Air Force logistics complex; Vance AFB; Altus AFB; Fort Sill — U.S. Army Field Artillery School; McAlester Army Ammunition Plant; Ouachita National Forest; Chickasaw NRA; Oklahoma City National Memorial; BIA holdings; 39 federally recognized tribal Indian Trust holdings affected by McGirt v. Oklahoma), the federal Miller Act at 40 U.S.C. § 3131 et seq. preempts state lien rights.