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Idaho Mechanics Lien Laws (Idaho Code § 45-501 et seq.)

In Idaho, a mechanics lien is a powerful tool to ensure payment for labor, materials, and services provided on private construction projects. However, the state imposes strict deadlines and requirements that must be followed precisely.

Right to Lien (Idaho Code § 45-501)

Under Idaho Code § 45-501, every person performing labor upon, or furnishing materials to be used in the construction, alteration, or repair of any building, wharf, bridge, ditch, dike, flume, tunnel, fence, machinery, railroad, wagon road, aqueduct, or any other structure, or who grades, fills in, levels, surfaces, or otherwise improves any land, has a lien upon the same for the work or labor done or professional services or materials furnished. This includes every contractor, subcontractor, architect, builder, or any person having charge of the construction, alteration, or repair of any building or other improvement, who shall be held to be the agent of the owner for the purpose of this chapter.

For purposes of this chapter, the term "furnishing material" also includes supplying, renting, or leasing equipment, materials, or fixtures as defined in section 28-12-309, Idaho Code.

Preliminary Notice Requirements

Idaho is unique in that a preliminary notice is generally not required for subcontractors or material suppliers to preserve their mechanics lien rights on private projects. However, it is highly recommended to send one voluntarily to establish communication and encourage timely payment. Sending a preliminary notice early in the project helps establish visibility with the property owner and general contractor, and provides a documented record of your involvement.

Residential Disclosure Statement

For general contractors working on a residential project (1–4 units) with a contract exceeding $2,000, you must provide the property owner with a written Residential Disclosure Statement *before* entering into the contract. Failure to deliver this disclosure can affect lien rights. This requirement is codified under Idaho Code § 45-525, which was effective July 1, 2022.

Recording Deadline (Idaho Code § 45-507)

Under Idaho Code § 45-507(2), a "Claim of Lien" must be recorded with the county recorder in the county where the property is located within ninety (90) days after the completion of the labor or services, or furnishing of materials.

The claim must contain: a statement of the demand after deducting all just credits and offsets; the name of the owner or reputed owner, if known; the name of the person by whom the claimant was employed or to whom materials were furnished; a description of the property to be charged with the lien sufficient for identification; and for work or materials subject to § 45-525, the required proof of disclosure and acknowledgment of receipt.

The claim must be verified by the oath of the claimant, their agent, or their attorney to the effect that the affiant believes the same to be just.

Post-Recording Notice Requirements

Under Idaho Code § 45-507(5), after recording your Claim of Lien, you are required to serve a true and correct copy of the claim on the owner or reputed owner of the property either by personal delivery or by certified mail to the owner's last known address. Such delivery or mailing shall be made no later than five (5) business days following the filing of said claim of lien. This is a critical step that is often overlooked.

Enforcement Deadline

If you remain unpaid, you must initiate a lawsuit to foreclose on the lien within six (6) months from the date the lien was filed. Idaho law strictly construes this deadline, and failure to file within the statutory period will result in the lien being void.

Public Works Projects

Mechanics liens are not available on public works projects in Idaho. Instead, parties working on public contracts of **$50,000 or more** can file a claim against a **payment bond**. Under **Idaho Code § 54-1926**, before any contract equal to or greater than $50,000 for the construction, alteration, or repair of any public building or public work is executed, the person to whom such contract was awarded must furnish a performance bond and a payment bond in amounts fixed by the contracting body, but in no event less than 85% of the contract amount.

The payment bond is solely for the protection of persons supplying labor or materials, or renting, leasing, or otherwise supplying equipment to the contractor or their subcontractors.

Idaho Lien Deadlines at a Glance

Documents to Preserve for an Idaho Lien Claim

Idaho courts require proof that you furnished labor or materials and that they were incorporated into the property. The following records are what you need:

• Signed contract or purchase order with the prime contractor
• Residential Disclosure Statement (if applicable)
• Proof of service of any voluntary preliminary notice
• Delivery tickets signed by an authorized site representative
• Daily reports showing crew on site and work performed
• Photo evidence of installed work (timestamped and geotagged)
• Jobsite sign-in logs and crew attendance records
• Invoices, statements, and payment applications
• Email or text correspondence about scope and payment
• Change orders and extra work authorizations
• Certified mail receipts for the post-recording notice
• Copy of the recorded Claim of Lien with county recorder stamp

MyCrewTracker stores all of these in one project record. When a lien deadline approaches, the back office can generate the timeline needed to prepare the Claim of Lien without reconstructing months of field activity.

Idaho-Specific Gotchas

No preliminary notice is required — but voluntary notice is valuable. Idaho does not require subcontractors or suppliers to send a preliminary notice to preserve lien rights on private projects. However, sending one voluntarily establishes communication and creates a documented record of your involvement.

The Residential Disclosure Statement is mandatory for residential projects. For residential projects (1–4 units) with a contract exceeding $2,000, the general contractor must provide a written Residential Disclosure Statement before entering into the contract. Failure to deliver this disclosure can affect lien rights.

The 90-day recording deadline is absolute. Idaho Code § 45-507(2) gives you exactly 90 days from your last day of furnishing to record the Claim of Lien with the county recorder. There are no extensions.

The 5-business-day notice requirement is often overlooked. After recording the lien, you must serve a copy on the owner within 5 business days. Failure to do so can invalidate the lien. This is a strict deadline that catches many contractors off guard.

The 6-month enforcement deadline is absolute. You have exactly 6 months from recording the lien to file a foreclosure action. Set two calendar reminders: one at 4 months, one at 5 months.

Public projects require payment bond claims. Mechanics liens cannot be filed against public property. Instead, you must file a claim against the project's payment bond, which is required for contracts of $50,000 or more.

Private retainage is capped at 5%. Under Idaho Code § 29-115, retainage on private projects cannot exceed 5% of the payment or contract price. The cap does not apply if the contractor fails to provide a performance bond when requested.

Retainage reduction is required at substantial completion. Within 35 days of substantial completion, retainage must be reduced to the lesser of 150% of the estimated value of remaining work or the original retainage amount. Final release is required within 35 days of final completion.

Public works retainage is capped at 5% when bonds exceed 50%. Under Idaho Code § 54-1926(3), public bodies requiring performance or payment bonds in excess of 50% of the contract amount cannot withhold more than 5% as retainage.

Statute of repose is six years for tort actions. Under Idaho Code § 5-241, tort actions arising from construction defects accrue six years after final completion of construction. Contract actions accrue at the time of final completion. Retain project records for at least six years.

Notice and Opportunity to Repair is required for residential claims. Under Idaho Code § 6-2503, before filing a lawsuit for a construction defect, the claimant must serve written notice on the construction professional. The professional has 21 days to respond. Compliance is an absolute prerequisite to filing suit.

Example Scenario: How Documentation Determines the Outcome

*The following is an illustrative scenario, not a specific case. It demonstrates how record-keeping affects outcomes in Idaho lien disputes.*

Consider a Boise mechanical subcontractor on a $600,000 commercial office renovation. The sub first furnishes labor on March 1. The sub's last day of substantial work is August 15.

Under Idaho Code § 45-507(2), the sub has 90 days from August 15 to record the Claim of Lien with the Ada County Recorder. That deadline is November 13. The sub records the Claim of Lien on November 5 and serves a copy on the owner by certified mail on November 8 — within the 5-business-day requirement.

Under Idaho law, the sub has 6 months from November 5 to file suit to foreclose on the lien. That deadline is May 5 of the following year. The sub files suit on March 15, well within the window. The lien is enforceable.

Now consider the same sub who records the Claim of Lien on November 5 but fails to serve a copy on the owner within 5 business days. Under Idaho Code § 45-507(5), the lien can be invalidated. The sub loses all lien rights, regardless of how much documentation they have.

Documentation is what separates these outcomes. MyCrewTracker logs the first day of work, the last day of work, the recording date, the service date, and the daily reports that prove performance.

Idaho Prompt Payment and Retainage Limits

Private Projects (Idaho Code § 29-115)

Under Idaho Code § 29-115, retainage withheld by an owner from an original contractor (or by a contractor from a subcontractor) cannot exceed 5% of the payment, and in no event shall the total retention withheld exceed 5% of the contract price.

The 5% maximum does not apply if the original contractor or subcontractor fails to provide a performance bond issued by a surety acceptable to the owner when requested. Additionally, the 5% maximum does not apply to private work of improvement to residential real property consisting of one (1) to four (4) units occupied or to be occupied by the owner.

Retainage Reduction and Release:

• Within 35 days from substantial completion, retention withheld by the owner shall be reduced to the lesser of 150% of the estimated value of work yet to be completed or the retention then withheld, not to exceed 5% of the contract price.
• Within 35 days from final completion, the retention withheld by the owner shall be released, except in the event of a dispute.
• The owner may condition final release upon receipt of satisfactory lien waivers from all persons with actual or potential lien claims.

Retainage to Subcontractors:

Within 10 days from the time the original contractor receives retention proceeds, the contractor shall pay each subcontractor their share of the retention received.

There are no statutory prompt payment deadlines for private projects in Idaho, meaning the terms are governed by the contract between the parties.

Public Projects (Idaho Code § 54-1926)

For public works contracts, contractors may withhold no more than 5% from subcontractors as retainage. Public entities must generally accept, certify, and pay the prime contractor within 60 calendar days after receiving a proper payment request, unless the contract specifies otherwise.

Retainage Release:

• The public body shall release to the contractor any retainage for those portions of the project accepted by the contracting public body and the contractors as complete within 30 days after such acceptance.
• The contractor shall remit the retainage to the subcontractor within 30 days after completion of the subcontract.

Under Idaho Code § 54-1926, a payment bond in an amount not less than 85% of the contract amount is required for public works contracts of $50,000 or more, solely for the protection of persons supplying labor or materials.

Idaho Statute of Repose and Accrual (Idaho Code § 5-241)

Idaho Code § 5-241 governs the time limits for bringing actions related to the design or construction of improvements to real property. Under this section:

• Tort actions (such as negligence) arising out of the design, planning, supervision, or construction of an improvement, if not previously accrued, shall accrue and the applicable limitation statute shall begin to run six (6) years after the final completion of construction of such an improvement.
• Contract actions shall accrue and the applicable limitation statute shall begin to run at the time of final completion of construction of such an improvement.

The statute provides an absolute outer limit for bringing construction defect claims. This is a statute of repose, not a statute of limitations — it bars claims regardless of when the defect was discovered.

Notice and Opportunity to Repair (Idaho Code § 6-2503)

Before filing a lawsuit for a construction defect, claimants must comply with the Notice and Opportunity to Repair Act (Idaho Code § 6-2503). Under this statute:

• The claimant must serve written notice of claim on the construction professional prior to commencing an action.
• The notice must describe the claim in reasonable detail sufficient to determine the general nature of the defect.
• Within 21 days after service of the notice, the construction professional must serve a written response, which may propose an inspection, offer a monetary settlement, or dispute the claim.
• Any action commenced prior to compliance with the statute shall be dismissed by the court without prejudice and may not be recommenced until the claimant has complied.
• If a written notice of claim is served, the statute of limitations is tolled until 60 days after the period during which the filing of an action is barred.

This requirement applies only to residential construction claims, not commercial construction.

What MyCrewTracker Does (and Does Not Do) in Idaho

MyCrewTracker is a construction documentation platform, not a legal service. Here is what it does for Idaho contractors:

• Logs first day and last day of work per project so you can calculate the 90-day recording deadline and the 6-month enforcement window
• Stores certified mail receipts and lien notice documents in the project file
• Records delivery tickets with photo and signature capture
• Captures timestamped, GPS-tagged site photos that document installation
• Generates daily report PDFs that serve as contemporaneous records
• Tracks retainage and payment dates for private and public project compliance
• Archives project records for 6+ years to support construction defect defense

What MyCrewTracker Does NOT Do: We do not provide legal advice, draft or file Claims of Lien, or guarantee compliance. We are a software platform, not attorneys. The responsibility for adhering to Idaho law and verifying all information remains with you and your legal counsel.