Preliminary notice requirements for mechanics liens are the rules that force subcontractors, suppliers, and sometimes other construction participants to formally announce their involvement on a project — in writing, to specific people, within a specific window — or lose the right to file a mechanics lien if they go unpaid. The notice itself doesn’t start a dispute or create a lien. It puts the owner, lender, and general contractor on record that you’re on the job, so that if payment later stalls, you’ve preserved the legal option of filing a claim against the property.
Three variables control whether you’ve met the requirement: who you are on the project, what the notice says, and when and how it reaches the right people. Each of those is set by state law and varies, but the shape of the obligation is consistent across the roughly three-quarters of U.S. states that require a notice.
Who Has to Send One
The obligation falls hardest on parties with no direct contract with the property owner. Subcontractors, sub-subcontractors, and material suppliers typically have to send a notice because the owner may not even know they exist. A framing crew hired by the general contractor, or a steel supplier delivering to a subcontractor, has no contractual relationship with the person who owns the building. Without a preliminary notice on file, those parties are invisible to the owner and often lose any right to lien the property if they go unpaid.
Material suppliers and equipment rental companies are among the most commonly affected. If you deliver lumber or electrical panels, or rent excavation equipment to a job site, most states expect the notice regardless of the project’s size. The logic is that an owner who doesn’t know you supplied materials shouldn’t be blindsided by a lien months later.
General contractors who contract directly with the owner are frequently exempt, since the owner already knows about them. A meaningful number of states still require the prime contractor to notify the construction lender, so the bank funding the project has a clear picture of who might file a claim. The safe assumption for any general contractor working in an unfamiliar state is to check whether the exemption actually applies before skipping the notice.
Architects, engineers, surveyors, and landscape architects sit in an unusual spot. Several states exempt design professionals from preliminary notice requirements entirely, recognizing that their contracts typically run directly to the owner and that their involvement is documented in permits and plans. The exemption is not universal, so design professionals working across state lines should confirm the rule in each jurisdiction.
What the Notice Has to Say
Forms vary by state, but the required content is remarkably consistent. The notice has to let anyone reading it identify who is on the project, what they’re doing, and which property is involved.
- Your full legal business name, mailing address, and contact information as the party asserting the right to file a future lien.
- The legal name and address of the property owner. Pull this from the contract and verify it through the county recorder’s office.
- The name of whoever hired you. For a subcontractor, usually the general contractor; for a sub-subcontractor, the subcontractor who issued the purchase order.
- The name and address of the prime contractor.
- The construction lender’s name and address, if there is a bank or mortgage company funding the project. Many states require this.
- A property description. The street address is enough in many jurisdictions, but some states also require the formal legal description from the deed (lot, block, subdivision). Using the legal description removes any ambiguity if the notice is later challenged.
- A general description of your work or materials, such as “plumbing installation” or “concrete supply.” Line-item detail isn’t needed, but your role on the project should be identifiable.
- A good-faith estimate of the total contract price for your labor or materials. It doesn’t have to be exact and can be updated if scope changes.
Name accuracy matters more here than on most business documents. A misspelled owner name or an outdated entity type gives an opposing attorney grounds to challenge the notice during litigation. Cross-check every name against the original contract and, where possible, against property records at the county recorder’s office. Most states that require a notice also prescribe a specific form or publish a template through a state agency or construction registry; use the official form where one exists.
When It Has to Be Sent
The clock starts on the date you first furnish labor or materials to the job site. Most states set a deadline between 20 and 60 calendar days from that date. Twenty days is the most common cutoff. Some states give certain parties longer, and at least one measures the period in business days rather than calendar days. The specific number depends on your role and sometimes on the project type, residential versus commercial.
What First Furnishing Means
“First furnishing” sounds simple, and it’s one of the most litigated details in mechanics lien disputes. Delivering materials to the job site generally starts the clock, even if nothing has been installed yet. On-site labor clearly counts. The gray areas are mobilization activities: site visits, measurements, shop drawings. In most jurisdictions, preparatory off-site work does not trigger the deadline, but the moment physical labor or materials arrive on-site, the countdown begins.
For suppliers making multiple deliveries under a single contract, the first delivery usually sets the deadline, not the last. If deliveries span separate, unrelated purchase orders, each order may start its own notice period. Track the exact date of every first delivery or first day of on-site work. Getting this date wrong by even a few days can shorten or eliminate lien rights.
Notice of Commencement
In some states, the owner or general contractor files a Notice of Commencement at the county recorder’s office before construction begins. It formally establishes the project’s start date and identifies the owner, lender, general contractor, and property. If one has been filed, your preliminary notice deadlines and the addresses you have to send it to may be tied to the information in that document. Look for a posted copy at the job site or request one from the general contractor. Sending the preliminary notice to the wrong address because you didn’t consult the Notice of Commencement can undermine your lien rights.
Centralized Registries
A handful of states have moved away from the mail-it-yourself model and require preliminary notices to be filed through a centralized online database. Utah’s State Construction Registry is one example: original contractors must file a preliminary notice within 20 days of starting work, and the registry creates a public record of every party that has preserved lien rights on the project. The filing date in the registry also determines lien priority. In registry states, if the owner or general contractor files a Notice of Commencement in the registry, subcontractors have to file within the required window or forfeit lien rights; in some registry states, if the owner never registers the project, subcontractors are relieved of the filing obligation entirely. Verify whether each project state uses a registry, because the process and consequences differ from the traditional mail-based approach.
How It Has to Be Delivered
A preliminary notice that sits in a filing cabinet doesn’t protect anything. Delivery has to create verifiable proof the intended recipient received it. The widely accepted methods are:
- Certified mail with return receipt requested. The standard approach. You get a tracking number and a signed receipt. Keep the green return receipt card as evidence.
- Registered mail, similar to certified mail but with tighter chain-of-custody tracking. Some states specifically list this as acceptable.
- Personal service, where a process server or neutral third party physically hands the notice to the owner, general contractor, or an authorized agent. Harder to dispute, more expensive.
In registry states, you submit through the state’s construction registry website rather than mailing directly. The registry handles notification and creates a timestamped record.
Whatever the method, complete a proof of service declaration documenting when and how you sent the notice. Courts will demand this evidence if a lien dispute goes to litigation. Store the proof of service alongside a copy of the notice itself, the delivery receipt, and any tracking confirmation. Most owners won’t respond, and that’s normal. The notice is a routine part of construction billing.
What Missing the Deadline Costs
Missing the deadline doesn’t always destroy lien rights, but it shrinks them. States that follow a “rolling” or “retroactive” notice rule let a late notice protect your right to lien for work performed during a lookback window before the date you actually sent it. If your state uses a 20-day deadline and you send the notice on day 50 of the project, you may only be able to claim a lien for work performed in the 20 days before you sent it. Everything from the first 30 days falls outside the protected window and is likely unrecoverable through a mechanics lien.
In hard-deadline states, the consequence is worse: miss the window, lose lien rights entirely, regardless of how much work you performed. There’s no national default. Sending the notice on day one of the project costs nothing and eliminates the risk. Waiting costs money in lost recovery rights and gains nothing.
Public Projects Work Differently
Mechanics liens attach to private property. You cannot lien government-owned land. On public construction, preliminary notices serve a different function: they preserve the right to make a claim against the project’s payment bond, not against the property.
On federal projects, the Miller Act requires the prime contractor to post a payment bond protecting subcontractors and suppliers. A party in direct contract with the prime can bring a bond claim without any preliminary notice. A party whose contract is with a subcontractor rather than the prime must give written notice to the prime contractor within 90 days after the date it last furnished labor or materials, stating the amount claimed and identifying who it furnished to. Service can be any method that provides written, third-party verification of delivery to the contractor’s office, place of business, or residence. A lawsuit on the bond has to be filed within one year of the last day work was performed or materials supplied.1Office of the Law Revision Counsel. 40 USC 3133 – Rights of Persons Furnishing Labor or Material
Most states have their own versions, commonly called Little Miller Acts, covering state-funded and municipal projects. Deadlines and procedures vary, but the concept is the same: the claim runs against the bond, not the property. Some states require subcontractors and suppliers to submit a preliminary notice before public work begins, and failing to do so can bar a bond claim. If you regularly work on government contracts, check bond claim notice requirements separately for every state where you take on public work.
Mistakes That Void a Notice
The same errors show up repeatedly, and most are easy to avoid.
- Wrong owner name. Sending the notice to “John Smith” when the property is held by “Smith Family Trust” gives the other side an argument that the notice is defective. Verify the legal name through county property records.
- Guessing at the first-furnishing date. Many subcontractors track the date they signed the contract or were told to start, not the date they actually delivered materials or performed work on-site. The statute cares about the second date.
- Sending the notice to the general contractor but not the owner. Most states require the notice to reach the owner directly. Sending it only to the GC who hired you doesn’t satisfy the statute.
- No proof of delivery. Regular first-class mail doesn’t create a verifiable record. If the recipient denies getting the notice, you have no evidence for court.
- Assuming the GC will handle it. General contractors have no obligation to send preliminary notices on behalf of their subs. Each party is responsible for its own lien rights.
The cost of sending a preliminary notice is trivial compared to the cost of losing a lien claim. Certified mail runs a few dollars. Losing the right to collect on a $50,000 subcontract because a form never went out is the kind of mistake that closes businesses. Send the notice on every project, in every state, even when you’re not sure it’s required. The worst outcome is an unnecessary piece of mail.