Idaho: Mechanic's Lien Deadlines & Notice Requirements
The short answer
Idaho gives a lien to almost anyone who performs labor on, or furnishes materials for, a construction project — contractors, subcontractors, suppliers, laborers, and even professional engineers and licensed surveyors under contract. No preliminary notice is required to preserve lien rights on any project; the only notice Idaho requires is a residential-specific disclosure a general contractor must give before signing a contract over $2,000 with a homeowner. Every claimant, regardless of tier, must record the lien within 90 days of completing their own work or last furnishing materials, then serve a copy on the owner within 5 business days. Once filed, a lien binds the property for only 6 months unless the claimant sues to foreclose it within that time. A trap that lives outside Chapter 5 entirely: an unregistered contractor conclusively waives all lien rights under the separate Idaho Contractor Registration Act, even though a registered subcontractor working under that contractor keeps its own lien rights.
| Governing law | Idaho Code Title 45, Chapter 5, §§ 45-501 to 45-525, 'Liens of Mechanics and Materialmen' — one of the nation's older lien statutes (original enactment 1893), still organized as a single chapter rather than separate notice/lien/bond articles |
|---|---|
| Who can claim a lien | Broad by design (§ 45-501): anyone performing labor on, or furnishing materials for, the construction, alteration, or repair of a building, mine, or other structure, or who grades, fills, or otherwise improves land, plus any professional engineer or licensed surveyor under contract who furnishes plans, surveys, or on-site supervision. Every contractor, subcontractor, architect, or builder in charge of the work is deemed the owner's 'agent' for lien purposes, so subcontractor-furnished work still creates a lien against the owner. § 45-504 adds a separate lien for grading, surveying, or otherwise improving an incorporated city or town lot at the owner's request. A contractor not registered under the Idaho Contractor Registration Act 'shall be denied and shall be deemed to have conclusively waived' lien rights (§ 54-5208) — though a duly registered subcontractor working under an unregistered contractor, an employee of one, or a supplier who didn't know or reasonably believe the contractor was unregistered keeps lien rights regardless |
| Preliminary notice | No general preliminary notice is required to preserve lien rights, for any claimant tier or project type. The one notice-like step in the chapter is narrower and residential-specific — see Homestead/residential extras below for the § 45-525 disclosure a general contractor must give before contracting on residential work |
| Deadline to file the lien | 90 days after completion of the labor or services, or furnishing of materials (§ 45-507(2)) — the same count for every claimant, with no separate timeline for a prime contractor versus a subcontractor or supplier |
| Notice of completion effect | Chapter 5 has no notice of completion, substantial completion, or termination mechanism that shortens the 90-day filing deadline; the clock always runs from the claimant's own completion or last-furnished date, regardless of any notice the owner might record |
| Serving the lien on the owner | The claimant must serve a true and correct copy of the recorded claim on the owner or reputed owner within 5 business days after filing (§ 45-507(5)), either by personal delivery through 'an officer authorized by law to serve process' or by certified mail to the owner's last known address. A deed-of-trust trustee doesn't count as an 'owner' for this purpose (§ 45-507(6)) |
| Deadline to sue to foreclose | A lien binds the property for only 6 months after the claim is filed unless suit to enforce it is commenced within that time (§ 45-510(1)). Accepting a partial payment or granting an extension of credit — if endorsed and recorded on the lien with its expiration date — resets the window to 6 months after that expiration date. A final judgment obtained on the lien stays enforceable for 10 years from when it becomes final |
| Homestead/residential extras | § 45-525 requires a general contractor to give a homeowner or residential purchaser a signed disclosure statement, with a signed acknowledgment of receipt, before entering any contract over $2,000 to build, alter, or repair residential property of 1-4 units (or to sell newly built residential property). The disclosure must cover 4 specific homeowner rights: to require lien waivers from the contractor's subcontractors, to see proof of the contractor's liability and workers' comp insurance, to be told about extended title insurance covering unfiled or unrecorded liens, and to require a surety bond up to the project's value. A separate disclosure must list every subcontractor, materialman, or rental-equipment provider owed more than $500, given before closing or final payment. Skipping either disclosure is a deceptive trade practice under the Idaho Consumer Protection Act (§ 45-525(4)), and the claim of lien itself must include proof the disclosure and acknowledgment were provided for any covered work (§ 45-507(3)(e)). An emergency-repair carve-out excuses the disclosure when the homeowner initiates contact for a bona fide emergency or a necessary electrical, plumbing, or water-system repair (§ 45-525(6)) |
Compare this rule across all 50 states + DC →
The short answer
Idaho's mechanic's lien reaches almost anyone who performs labor on, or
furnishes materials for, a construction project: contractors,
subcontractors, suppliers, laborers, and even professional engineers and
licensed surveyors working under contract. No preliminary notice is
required from anyone to preserve lien rights on any project. The only
notice Idaho's lien chapter requires is narrower than that: a general
contractor must give a homeowner or residential buyer a signed disclosure
statement before signing a contract over $2,000 for residential work. Every
claimant, no matter their tier, must record the lien within 90 days of
completing their own work or last furnishing materials, then serve a copy
on the owner within 5 business days. Once recorded, a lien only binds the
property for 6 months unless the claimant sues to foreclose it in that
window. One trap lives entirely outside the lien chapter: a contractor who
isn't registered under Idaho's separate Contractor Registration Act
conclusively waives all lien rights, even though a registered subcontractor
working under that same unregistered contractor keeps its own.
Requirements one by one
Governing law
Idaho's private mechanic's lien lives in Idaho Code Title 45, Chapter 5,
§§ 45-501 to 45-525, "Liens of Mechanics and Materialmen." It's one of the
older lien statutes still in force, tracing to an 1893 enactment, and
unlike many states' modern lien codes it stays organized as a single
chapter rather than splitting notice, filing, and bond-release procedures
into separate articles — though §§ 45-518 to 45-524 do carve out their own
sub-sequence for releasing a lien by posting a surety bond.
Who can claim
Section 45-501 casts a wide net: anyone "performing labor upon, or
furnishing materials to be used in the construction, alteration or repair"
of a building, mine, or other structure, or who "grades, fills in, levels,
surfaces or otherwise improves any land," has a lien — and so does "every
professional engineer or licensed surveyor under contract" who furnishes
plans, surveys, estimates, or on-site supervision. The statute also deems
"every contractor, subcontractor, architect, builder or any person having
charge of" the work to be "the agent of the owner," which is why work
authorized through a general contractor still creates a lien against the
owner even without direct owner privity. Section 45-504 adds a separate,
narrower lien for someone who grades, surveys, or otherwise improves a lot
in an incorporated city or town at the owner's request. A rule that sits
entirely outside Chapter 5 can wipe out lien rights before they start:
under the Idaho Contractor Registration Act, an unregistered contractor
"shall be denied and shall be deemed to have conclusively waived any right
to place a lien" (§ 54-5208) — but that denial doesn't reach a duly
registered subcontractor working under the unregistered contractor, an
employee of the unregistered contractor, or a supplier who didn't know or
reasonably believe the contractor lacked registration.
Preliminary notice
Idaho doesn't require any claimant — prime contractor, subcontractor,
supplier, or laborer — to send a preliminary notice to preserve lien
rights on any private project. The chapter's only notice-like requirement
is the residential disclosure discussed below, and it's a homeowner-
protection rule tied to contract formation, not a lien-preservation notice
that every claimant must send.
Deadline to file the lien
Section 45-507(2) sets one flat deadline: the claim "shall be filed within
ninety (90) days after the completion of the labor or services, or
furnishing of materials." Unlike states that give a prime contractor a
longer window than subcontractors and suppliers, Idaho runs the same
90 days for every claimant regardless of tier.
Notice of completion effect
Nothing in Chapter 5 lets an owner record a notice of completion,
substantial completion, or termination to shorten the 90-day filing
deadline. The numbering of the chapter itself confirms there's no such
mechanism tucked between existing sections: it runs 45-501, then jumps to
45-504 through 45-525, with no notice-of-completion provision anywhere in
that range. The 90-day clock always runs from the claimant's own
completion or last-furnished date.
Serving the lien on the owner
Section 45-507(5) requires the claimant to serve "a true and correct copy
of the claim of lien" on the owner or reputed owner within "five (5)
business days following the filing" — either through personal delivery by
"an officer authorized by law to serve process" (a process server, not
just any person) or by certified mail to the owner's last known address.
Section 45-507(6) clarifies that a deed-of-trust trustee doesn't count as
an "owner" for this purpose, so service doesn't need to reach the trustee
separately.
Deadline to sue to foreclose
Section 45-510(1) gives a recorded lien only 6 months of life: it "binds"
the property "for a longer period than six (6) months after the claim has
been filed" only if the claimant commences court proceedings within that
window. That 6-month period can be extended, not shortened: if the
claimant accepts a partial payment or grants an extension of credit, and
endorses that payment or credit (with its expiration date) on the recorded
lien, the lien survives for "six (6) months after the date of such payment
or expiration of extension." Once a claimant wins a final judgment on the
lien, that judgment itself stays enforceable for 10 years.
Homestead/residential extras
Section 45-525 requires a general contractor to give a homeowner or
residential real property purchaser a signed disclosure statement — with a
signed acknowledgment of receipt — before entering into any contract over
$2,000 to construct, alter, or repair residential property of 1 to 4
dwelling units, or to sell newly constructed residential property. The
disclosure must inform the homeowner of four specific rights: to require
the contractor to obtain lien waivers from its subcontractors (at the
homeowner's expense), to see proof of the contractor's general liability
and workers' compensation insurance, to be told about the option to buy
extended title insurance covering unfiled or unrecorded liens, and to
require a surety bond up to the project's value. A second disclosure,
separate from the first, must list every subcontractor, materialman, or
rental-equipment provider owed more than $500 who has a direct contract
with the general contractor, delivered before closing or before the
homeowner's final payment. Skipping either disclosure "shall constitute an
unlawful and deceptive act or practice" under the Idaho Consumer Protection
Act (§ 45-525(4)), and the claim of lien itself must attach proof the
disclosure and acknowledgment were provided for any work this section
covers (§ 45-507(3)(e)) — an omission that, per the statute's own terms
making the claim's contents mandatory, can leave the recorded claim
invalid. An emergency-repair carve-out excuses the disclosure when the
homeowner (or the homeowner's agent) initiates contact with the contractor
for a "bona fide emergency" or a necessary electrical, plumbing, or
water-system repair (§ 45-525(6)).
What trips people up
The contractor-registration trap is the sharpest one, and it's easy to
miss because it doesn't live in Chapter 5 at all: it's tucked into the
separate Idaho Contractor Registration Act at Title 54, Chapter 52. A
contractor who starts work before registering — or who lets a registration
lapse — risks losing lien rights for that period entirely, even if the
underlying debt is real and the work was done well. Second, don't confuse
the two very different 5-business-day and 6-month clocks: the 5 days
(§ 45-507(5)) is how fast the claimant must mail or personally serve the
recorded lien on the owner, while the 6 months (§ 45-510(1)) is how long
the claimant then has to actually sue to foreclose that lien — missing
either one has a different consequence. Third, the residential disclosure
under § 45-525 isn't optional paperwork on the side: because § 45-507(3)(e)
folds proof of that disclosure into the claim of lien's own required
contents, a general contractor who skips it on a covered residential job
risks an invalid lien on top of a separate consumer-protection violation.
Common questions
Do I need to send a notice before I start work in Idaho?
No — Idaho has no general preliminary-notice requirement for any claimant.
The only disclosure obligation is the residential one under § 45-525,
owed by general contractors to homeowners before signing certain
residential contracts.
I'm a subcontractor working for a contractor who I later learned wasn't
registered. Do I still have lien rights?
Yes, as long as you were duly registered yourself and didn't know (and
had no reason to believe) the contractor lacked registration — § 54-5208
protects a registered subcontractor, an unregistered contractor's own
employees, and an unknowing supplier even when the contractor's own lien
rights are denied.
Can I get more time to sue if the owner is still paying me down?
Yes. If the owner makes a partial payment or you grant an extension of
credit, and you endorse that payment or credit — along with an expiration
date — on the recorded lien, the 6-month foreclosure window restarts from
that expiration date instead of the original filing date (§ 45-510(1)).
Statutes and sources
- Idaho Code § 45-501 (right to lien) —
https://legislature.idaho.gov/statutesrules/idstat/title45/t45ch5/sect45-501/
(accessed 2026-07-05) - Idaho Code § 45-504 (lien for improving lots) —
https://legislature.idaho.gov/statutesrules/idstat/title45/t45ch5/sect45-504/
(accessed 2026-07-05) - Idaho Code § 54-5208 (denial of lien rights for unregistered contractors) —
https://legislature.idaho.gov/statutesrules/idstat/title54/t54ch52/sect54-5208/
(accessed 2026-07-05) - Idaho Code § 45-507 (claim of lien; 90-day filing deadline; service on
owner) —
https://legislature.idaho.gov/statutesrules/idstat/title45/t45ch5/sect45-507/
(accessed 2026-07-05) - Idaho Code § 45-510 (duration of lien; 6-month foreclosure window) —
https://legislature.idaho.gov/statutesrules/idstat/title45/t45ch5/sect45-510/
(accessed 2026-07-05) - Idaho Code § 45-525 (general contractors — residential property —
disclosures) —
https://legislature.idaho.gov/statutesrules/idstat/title45/t45ch5/sect45-525/
(accessed 2026-07-05)
Source links
Every statute quoted above, linked, with the date we checked it.