General contractors, subcontractors, laborers, and material suppliers who contributed to a construction or improvement project can generally file a mechanic's lien, though the specific eligibility rules vary meaningfully by state.

Because subcontractors and suppliers may not have a direct contract with the property owner, most states have separate notice and filing requirements for them compared to the general contractor who does.

Most states require some form of preliminary notice early in the project, informing the property owner that a party is furnishing labor or materials and may claim lien rights if unpaid.

There is typically a strict deadline for actually recording the lien after work stops or the project completes, followed by a further deadline to file a lawsuit enforcing the lien if the debt remains unpaid, so timing is critical for anyone considering this remedy.

A recorded lien can cloud the property's title, making it difficult to sell or refinance until it's satisfied, even when the real dispute is between the property owner and their general contractor rather than the subcontractor who filed it.

This dynamic can create real friction: an owner may have already paid the general contractor in full, only to discover a subcontractor further down the chain wasn't paid and has separately filed a lien against the property.

Verifying the amount and validity of the claimed work is an important first step, followed by negotiating payment or a lien release directly with the claimant where the debt is legitimate.

Requiring lien waivers from contractors and subcontractors as work is paid for throughout a project is a common preventive measure, and in some states an owner can obtain a lien release bond to clear the title while the underlying payment dispute is resolved separately.