A construction lien is a claim made against a property by people who have not been paid for work done on that property. Construction liens are designed to protect professionals from the risk of not getting paid for services rendered.
This process can make it difficult or impossible to sell or refinance your home because any claims can make its title unclear, which will affect how much money you get back when selling the house later down the line if there were other buyers interested in purchasing your home at some point during ownership.