Oklahoma: Mechanic's Lien Deadlines & Notice Requirements
The short answer
Oklahoma splits its mechanic's lien filing deadline by contract position: an original contractor who dealt directly with the owner has 4 months after last furnishing labor or materials to file a lien statement with the county clerk, while a subcontractor, sub-subcontractor, or supplier gets only 90 days. Anyone other than the original contractor must also send a 'pre-lien notice' to both the owner and the original contractor, generally within 75 days of last furnishing -- small claims under $10,000 on non-owner-occupied residential projects are exempt from that notice, but the exemption disappears entirely once the property is then occupied as a dwelling by its owner, where the notice becomes mandatory and the whole lien is invalid without it. Once filed, the county clerk -- not the claimant -- mails notice of the lien to the owner within 5 business days, and the claimant then has 1 year from the filing date to sue to enforce it. Equipment lessors get no lien rights at all on homestead-exempt or agricultural property, a narrower and separate carve-out from the general owner-occupied-dwelling notice rule.
| Governing law | Title 42 O.S. Chapter 3, "Mechanics and Materialmen" (§§ 141-150), with enforcement procedure in Chapter 5 (§§ 171-178); traces to the 1910 Revised Laws, most recently substantively amended for the pre-lien notice mechanism effective January 1, 2026. A separate oil-and-gas well lien track runs under §§ 144-149 and 150, outside this survey's scope |
|---|---|
| Who can claim a lien | Anyone who performs labor, furnishes material, or leases/rents equipment for erecting, altering, or repairing a building or improvement, under oral or written contract with the owner (§ 141); subcontractors, artisans or day laborers employed by the contractor, and sub-subcontractors/suppliers get the identical lien "from the same time, in the same manner, and to the same extent" (§ 143). Oklahoma courts, not the statute's text itself, have extended this to architects, engineers, and surveyors whose plans result in actual construction on the land. Equipment lessors are excluded entirely on homestead-exempt or agricultural property (§ 143.3) |
| Preliminary notice | Every claimant except the original contractor must send a written "pre-lien notice" to both the original contractor and the property owner, no later than 75 days after last furnishing (§ 142.6(B)(1)); exempt are claims under $10,000 and claims on a non-owner-occupied residential project of 4 or fewer units (§ 142.6(B)(3)) -- but that exemption never applies if the property is "then occupied as a dwelling by an owner," where the notice is mandatory and the whole lien is invalid without it |
| Deadline to file the lien | An original contractor (direct contract with the owner) has 4 months after last furnishing labor, material, or equipment to file a verified lien statement with the county clerk (§ 142); a subcontractor, artisan/day laborer, or sub-subcontractor/supplier gets only 90 days from their own last furnishing (§ 143) |
| Notice of completion effect | None. Chapter 3 has no owner-recorded notice of completion or cessation mechanism; the 4-month or 90-day filing clock always runs from the claimant's own last-furnished date, regardless of when the overall project actually finished |
| Serving the lien on the owner | The county clerk, not the claimant, mails notice of the filed lien to the owner by certified mail within 5 business days of filing, using the address the claimant furnishes and a fee the claimant pays (§ 143.1(A)); if the owner can't be found with due diligence, the claimant may, within 60 days of filing, serve an occupant instead or post notice on the property if it's unoccupied (§ 143.1(B)) |
| Deadline to sue to foreclose | 1 year from the date the lien statement was filed with the county clerk to bring a civil action enforcing it (§ 172); the current statute text sets no minimum waiting period before suit may be filed |
| Homestead/residential extras | Two separate rules layer on for homestead property: a pre-lien notice becomes mandatory, with no dollar-amount or small-project exemption, for any lien on property "then occupied as a dwelling by an owner," and the entire lien is invalid without it (§ 142.6(B)(1)); separately, an equipment lessor has no lien rights at all against real property that qualifies for the homestead exemption or is used for agricultural purposes (§ 143.3) |
Compare this rule across all 50 states + DC →
The short answer
Oklahoma's filing deadline depends on whether you dealt with the property
owner directly. An original contractor gets 4 months after their last day
of furnishing labor, material, or equipment to file a lien statement with
the county clerk; a subcontractor, artisan, day laborer, or sub-subcontractor
gets only 90 days. Before filing, everyone except the original contractor
also has to send a "pre-lien notice" to both the owner and the original
contractor, generally within 75 days of last furnishing -- small claims
under $10,000 on a non-owner-occupied residential project are exempt from
this notice, but that exemption vanishes the moment the property is
occupied as a dwelling by its owner, where the notice becomes mandatory and
skipping it invalidates the entire lien. Once filed, it's the county
clerk -- not the claimant -- who mails notice of the lien to the owner,
within 5 business days. From the filing date, the claimant then has 1 year
to sue to enforce the lien. A separate, narrower rule strips equipment
lessors of lien rights altogether on homestead-exempt or agricultural
property.
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 core provisions trace back to
the 1910 Revised Laws and have been amended piecemeal since, most recently
for the pre-lien notice mechanism, effective January 1, 2026. Title 42 also
contains a separate oil-and-gas well lien scheme (§§ 144 to 149), which runs
on its own filing and suit deadlines tied to a different section (§ 148)
and is outside this survey's private-construction-lien scope.
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, and "any 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. Notably, the statute's own text never
mentions architects, engineers, or surveyors; Oklahoma courts, not the
statute, have read § 141's "improvement" language to cover their work when
it actually results in construction on the land, rather than plans that
never get built. 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
Oklahoma has no mechanism here. Chapter 3 doesn't let an owner record a
notice of completion or cessation that shortens any claimant's filing
window; the 4-month or 90-day clock always runs from that claimant's own
last-furnished date, regardless of when the overall project actually wraps
up.
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. The current text sets no minimum waiting period before
suit can be filed -- only the one-year outer limit.
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?
Not if the project is a non-owner-occupied residential project of four or
fewer units. But if the owner actually lives in the property, § 142.6(B)(1)
requires the notice regardless of the dollar amount.
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 lien; who can claim; priority) —
https://govt.westlaw.com/okjc/Document/N788FEDB0C76E11DB8F04FB3E68C8F4C5?viewType=FullText
(accessed 2026-07-05) - 42 O.S. § 142 (original contractor's 4-month filing deadline) —
https://govt.westlaw.com/okjc/Document/N79D7AFF0C76E11DB8F04FB3E68C8F4C5?viewType=FullText
(accessed 2026-07-05) - 42 O.S. § 143 (subcontractor/sub-subcontractor lien; 90-day deadline) —
https://govt.westlaw.com/okjc/Document/N7BB5E5D0C76E11DB8F04FB3E68C8F4C5?viewType=FullText
(accessed 2026-07-05) - 42 O.S. § 142.6 (pre-lien notice; exemptions; owner-occupied-dwelling
rule) —
https://govt.westlaw.com/okjc/Document/NB40997718E0A11F0A26CEF304F15790C?viewType=FullText
(accessed 2026-07-05) - 42 O.S. § 143.1 (county clerk mails notice to owner; substitute service)
—
https://govt.westlaw.com/okjc/Document/N7CC42180C76E11DB8F04FB3E68C8F4C5?viewType=FullText
(accessed 2026-07-05) - 42 O.S. § 172 (1-year deadline to sue to enforce) —
https://govt.westlaw.com/okjc/Document/N81C4CD10C76E11DB8F04FB3E68C8F4C5?viewType=FullText
(accessed 2026-07-05) - 42 O.S. § 143.3 (equipment lessor excluded on homestead/agricultural
property) —
https://govt.westlaw.com/okjc/Document/N7D0CC340C76E11DB8F04FB3E68C8F4C5?viewType=FullText
(accessed 2026-07-05)
Source links
Every statute quoted above, linked, with the date we checked it.