Free Contractor Tool
Mechanics Lien Calculator
Estimate the unpaid amount you may be able to claim, and map preliminary-notice and filing targets from the day counts that apply in your state.
Built by SubcontractorHub — the software contractors use to quote, finance, and run every job.
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Estimate Claim Amount & Deadlines
Enter job value, payments received, and your state's notice and filing day counts. Confirm statute and procedure with counsel before sending notices or recording a claim.
1. Job value & unpaid balance
Usually 100% of unpaid labor/materials.
2. State notice & filing windows
Commonly 20–90 by state.
Often 60–120 from last furnish.
Unpaid balance
$40,000
job − paid
Est. claimable
$40,000
after claim %
Notice target
—
20 days from first furnish
Filing target
—
90 days from last furnish
Deadlines are statutory — calendar them the day you mobilize
Enter the notice and filing day counts from your state's statute (or counsel). This helper only adds those days to the dates you provide; it does not look up state law or validate your claimant tier.
This models a simple unpaid-balance claim and calendar offsets from dates you enter. It does not model state-specific exclusions, residential vs. commercial rules, notice content, service methods, foreclosure timelines, or bond-claim alternatives on public work. All calculations are estimates based on historical information and should be verified by the user. This tool is provided as a free service for planning purposes only and is not a substitute for professional legal advice.
From Material Takeoffs to a Signed Proposal
SubcontractorHub is the platform contractors use to turn takeoffs like these into a branded proposal, financing the customer can accept on the spot, and a scheduled job — without re-entering the job anywhere. This tool is free to use; the platform is here if you want a closer look.
Most lien fights start as documentation fights — missing daily reports, unsigned change orders, and fuzzy last-furnish dates. Keep that trail inside project management and bill cleanly with construction billing software.
How to Use This Lien Helper
Est. claimable ≈ (job value − paid to date) × claimable %
Notice target = first furnish + your state's preliminary-notice days. Filing target = last furnish + your state's lien filing window.
Send notices before you need the lien
Preliminary notice is cheap insurance. Many states require it early, and waiting until payment is late is often too late. Pair deadline tracking with the retainage calculator and payment bond calculator so you see cash-flow and security options together.
Public jobs are often bond claims, not liens
On many public projects you cannot lien the property; the payment bond is the remedy. Know which path applies before the filing window closes.
Frequently Asked Questions
- What is a mechanics lien?
- A mechanics lien (sometimes called a construction lien or materialman's lien) is a legal claim against real property for unpaid labor, materials, or services that improved that property. It gives unpaid contractors, subcontractors, and suppliers a path to secure payment by encumbering the property. Exact rights, notice requirements, and deadlines are set by state statute and vary widely.
- How much can I claim on a mechanics lien?
- In most states you can claim the unpaid value of labor and materials you actually furnished to the project — not the full contract if part has already been paid, and typically not speculative overhead or unrelated debts. Some states limit claims to the amount still owed up the chain or to the contract price for your scope. This calculator estimates claimable amount as job value minus amounts already paid, adjusted by a simple unpaid-percentage input.
- What are preliminary notice deadlines?
- Many states require a preliminary notice (also called a pre-lien or Notice to Owner) within a set number of days after first furnishing labor or materials — commonly 20 to 90 days depending on the state and whether you are a direct contractor or a lower-tier sub. Missing the notice window can forfeit or severely limit lien rights. Always confirm the rule for your role and state before relying on calendar math alone.
- How long do I have to file a mechanics lien?
- Filing deadlines are usually measured from last furnishing of labor or materials, from project completion, or from a notice of completion — often 60 to 120 days, with some states shorter or longer. The clock is unforgiving. This tool lets you enter your state's notice days and filing window as inputs so you can see calendar targets; it does not replace state-specific legal advice.
- Do I need a lawyer to file a mechanics lien?
- Lien statutes are technical. Errors in claimant name, property description, amount, notarization, or service can invalidate the claim. Many contractors use construction attorneys or specialized lien services for filing and foreclosure. Use this helper for planning and deadline awareness, then verify procedure with counsel licensed in the project state.
- Does a payment bond replace my lien rights?
- On many public projects, mechanics liens against public property are unavailable and a payment bond claim is the primary remedy instead. On private bonded jobs you may have both bond and lien options, subject to notice rules. See the payment bond calculator for premium planning, and treat bond claims and liens as separate statutory processes.
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SubcontractorHub keeps pay apps, change orders, photos, and daily logs on one job record — the evidence you need when payment stalls.
Book a DemoAll calculations are estimates based on historical information and should be verified by the user. Mechanics lien rights, notice content, service methods, and filing deadlines are governed by state statute and case law and differ by claimant tier and project type.
This tool is provided as a free service for planning purposes only and is not a substitute for professional legal advice. Confirm requirements with an attorney licensed in the project state before sending notices or recording a claim.