Mechanic's Liens: What Contractors Need to Know

If you've finished a job and a homeowner won't pay, you may have heard that a mechanic's lien is an option. A lot of contractors have heard the term but aren't sure exactly what it means or how it works.

Here's a straightforward explanation of what mechanic's liens are, when they might make sense, and why timing matters more than most people realize.

A mechanic's lien is a legal claim that a contractor, subcontractor, or supplier can file against a property when they've done work or provided materials but haven't been paid.

When a valid lien is filed against a property, it gets attached to the title. That means the homeowner typically can't sell the property or refinance their mortgage until the lien is dealt with — either by paying what's owed or by successfully challenging the lien.

For many contractors, just letting a homeowner know that a lien is being considered is enough to get a payment conversation started.

A mechanic's lien might be worth looking into when:

Not every unpaid invoice warrants a lien. But when the amount is significant and other attempts to collect haven't worked, it's worth understanding whether this option is available to you.

Here's the thing most contractors don't realize until it's too late: the deadlines for filing a mechanic's lien are strict, and missing them usually means losing your lien rights entirely.

In many states, you have somewhere between 60 and 90 days from the last date you performed work or delivered materials to file the lien. That window can go by quickly, especially when you're busy running a business and hoping the homeowner will eventually pay.

Once the deadline passes, there's typically no way to file the lien — no matter how clear-cut your case is. This is why it's worth getting legal guidance early in a dispute, not after you've waited several months.

In many states, contractors are required to send a preliminary notice to the property owner within a certain number of days of starting work. This notice is a prerequisite for filing a lien later — and if you didn't send it, you may have already lost your lien rights, even if you're still within the filing window.

The rules vary a lot from state to state. Some states require preliminary notices for all contractors. Others only require them for subcontractors or suppliers. Some have different rules depending on the type of project.

This is one of the main reasons it's worth talking to an attorney who knows the lien laws in your state before assuming you know what your options are.

Even if you're within the deadline and you sent the right notices, a mechanic's lien can be thrown out if it's not filed correctly. The requirements for what information must be included, how it must be formatted, and where it must be filed vary by state.

An attorney who handles contractor matters can walk you through the process and help make sure the lien is filed properly. Getting it right the first time matters.

One of the reasons contractors sometimes wait too long to look into their lien rights is the cost of consulting an attorney. If you're already dealing with an unpaid invoice, the last thing you want is a large legal bill on top of it.

Some contractors have found that a small business legal plan — like those offered through LegalShield — gives them access to a provider attorney for questions like this without hourly billing. Members can call their provider law firm to ask about lien rights in their state, get guidance on the process, and understand their options before making a decision.

If you're dealing with a payment dispute right now, it's worth looking into what options are available to you — and doing it sooner rather than later.