Mechanic’s lien
In the United States, a mechanic’s lien is a legal guarantee that ensures payment for labour or materials that have been supplied to improve property. Originally developed in relation to motor vehicles, mechanics were allowed to place a lien on the vehicles title if they were not paid for repair works.
However, the use of liens has subsequently widened and they are now sometimes referred to as construction liens, property liens, materialman's liens, supplier's liens and so on, and they are filed when payment has not been received for work done or goods or services provided.
In relation to property, liens appear in public property records and ‘travel with the land’, meaning that when property is bought and sold the lien is still attached to the land. This can make it difficult for property owners to complete a sale, if money is still owed to a contractor, and banks and lenders may be unwilling to refinance or lend against properties with liens attached. This can give property owners the incentive to have the issue settled and the lien removed.
Subcontractors and suppliers can also use liens as leverage to obtain payment from contractors. This can help, for example, in the event of the contractor going into liquidation.
The rules applying to costs that can be included in a lien vary from state to state, but generally, only costs relating to labour, goods and services that have improved the property are accepted. It is not usually possible for legal fees, punitive or qualitative damages to be included in the lien as these are not classed as having improved the property.
The claimant must file a court action to enforce the lien within an specified period of time, otherwise it becomes invalid. A Release of Lien can be sought from the lien holder if they have not brought an action, since this still has the potential of hindering the passing on of the property to a new owner.
[edit] Find out more
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
Frank Duffy: Researcher and Practitioner
Reflections on achievements and relevance to the wider research and practice communities.
The 2026 Compliance Landscape: Fire doors
Why 'Business as Usual' is a Liability.
Cutting construction carbon footprint by caring for soil
Is construction neglecting one of the planet’s most powerful carbon stores and one of our greatest natural climate allies.
ARCHITECTURE: How's it progressing?
Archiblogger posing questions of a historical and contextual nature.
The roofscape of Hampstead Garden Suburb
Residents, architects and roofers need to understand detailing.
Homes, landlords. tenants and the new housing standards
What will it all mean?
The Architectural Technology podcast: Where it's AT
Catch-up on the latest episodes.
Edmundson Apprentice of the Year award 2026
Entries now open for this Electrical Contractors' Association award.
Traditional blue-grey slate from one of the oldest and largest UK slate quarries down in Cornwall.
There are plenty of sources with the potential to be redeveloped.
Change of use legislation breaths new life into buildings
A run down on Class MA of the General Permitted Development Order.
Solar generation in the historic environment
Success requires understanding each site in detail.
Level 6 Design, Construction and Management BSc
CIOB launches first-ever degree programme to develop the next generation of construction leaders.
Open for business as of April, with its 2026 prospectus and new pipeline of housing schemes.
The operational value of workforce health
Keeping projects moving. Incorporating unplanned absence and the importance of health, in operations.
A carbon case for indigenous slate
UK slate can offer clear embodied carbon advantages.
Costs and insolvencies mount for SMEs, despite growth
Construction sector under insolvency and wage bill pressure in part linked to National Insurance, says report.