What Is a Mechanics Lien in Idaho — Complete 2026 Guide
✓ Verified against Idaho statutes · Reviewed August 2026 · By Michael Evan — Founder · 50 states · 799 rules
Idaho mechanics lien deadlines at a glance
Preliminary Notice
None — N/A
Mechanics Lien
90 days — From last date of furnishing
Enforcement
6 months — From filing
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90-Day Recording Deadline Under Idaho Code § 45-507
Every person claiming an Idaho mechanics lien must record a claim of lien with the County Recorder of the county in which the improved property is located within 90 days after completion of the labor or services or 90 days after the last furnishing of materials under § 45-507. The 90-day window is an absolute deadline — missing it permanently eliminates all mechanics lien rights for that claimant on that project. Each claimant's deadline runs from that claimant's own last date of furnishing, not the project completion date or the prime contractor's last day on site. The 90-day deadline applies uniformly across all claimant types in Idaho. The claim of lien must be verified — a notarized affidavit attesting to the truth of the contents is required — and must include the claimant's demand, the owner's name, the contracting party's name (if not the owner), a sufficient property description, and the date of last furnishing.
Residential Notice of Right to Lien — § 45-525
Idaho's residential preliminary notice rule under § 45-525 requires non-original contractors — subcontractors and material suppliers without a direct contract with the owner — to serve a Notice of Right to Lien on the owner of any residence containing four or fewer dwelling units before commencement of work on the project. This notice is a mandatory prerequisite to enforcing a lien against owner-occupied residential property. Without proper service of the Notice of Right to Lien before work begins, a non-original contractor's lien against owner-occupied residential property of 4 or fewer units may be unenforceable. The notice must include the claimant's name and address, the contracting party who hired the claimant, a description of the work or materials, and statutory warning language. General contractors in direct contract with the homeowner are exempt; commercial projects are exempt; multifamily projects above 4 units are exempt.
5-Business-Day Post-Recording Owner Notice and 44 Counties
Under Idaho Code § 45-507(5), every Idaho claimant must serve the property owner with a copy of the recorded claim of lien by certified mail within 5 business days after the recording date. The 5-business-day window is short — claimants who record close to Day 90 must serve the owner almost immediately. Retain certified mail tracking and return receipt as proof of service. Idaho has 44 counties; the correct filing county is determined by the physical location of the project property, not the contractor's home county. Major construction-volume counties include Ada (Boise), Canyon (Nampa, Caldwell), Kootenai (Coeur d'Alene), Bonneville (Idaho Falls), Twin Falls, Bannock (Pocatello), and Bonner (Sandpoint). Filing in the wrong county creates no valid lien on the property.
6-Month Enforcement Deadline Under § 45-510
Under Idaho Code § 45-510, an action to enforce the lien must be commenced in the District Court of the county where the property is located within 6 months from the date the claim of lien was recorded. Idaho's 6-month enforcement window is shorter than the 1-2 year windows common in many states and significantly shorter than North Dakota's 3-year window. The brief enforcement period requires Idaho claimants to move from recording to enforcement litigation efficiently. Calendar the 6-month enforcement deadline immediately upon recording. Set a 4-month reminder to evaluate payment status. Retain Idaho construction counsel by month 5 if the debt remains unresolved. Once the 6-month window closes under § 45-510, the lien cannot be enforced regardless of merit. The Mechanics Lien Management State System tracks the 6-month enforcement deadline automatically from the recording date.
Frequently Asked Questions
How long do I have to file a mechanics lien in Idaho?
All claimants must record a claim of lien with the County Recorder within 90 days after last furnishing under Idaho Code § 45-507. After recording, serve the owner by certified mail within 5 business days under § 45-507(5). Each claimant's 90-day deadline runs from that claimant's own last date of furnishing.
Where do I file a mechanics lien in Idaho?
File with the County Recorder of the county where the improved property is located under § 45-507. Idaho has 44 counties — major construction-volume counties include Ada (Boise), Canyon, Kootenai (Coeur d'Alene), Bonneville (Idaho Falls), and Twin Falls. The correct filing county is determined by the project address, not the contractor's home county.
Is a preliminary notice required in Idaho?
Idaho requires a Notice of Right to Lien only on residential improvements of 4 or fewer dwelling units under § 45-525. Non-original contractors (subs and suppliers without a direct contract with the owner) must serve this notice before commencement of work or risk losing lien rights against owner-occupied residential property. Commercial projects are exempt.
How long do I have to enforce an Idaho mechanics lien?
Under § 45-510, an action to enforce the lien must be commenced in the District Court within 6 months from the date the claim of lien was recorded. Idaho's 6-month enforcement window is shorter than the 1-2 year windows common in many states. Calendar the deadline immediately upon recording.
Who can file a mechanics lien in Idaho?
Under § 45-501, every person performing labor upon or furnishing materials to be used in the construction, alteration, or repair of any building or improvement has a lien — including general contractors, subcontractors at any tier, material suppliers, equipment lessors, laborers, architects, engineers, and surveyors.