Construction law is a general reference to various areas of law as applied to the design, engineering, and construction of buildings—including residential buildings and commercial buildings—as well as bridges, roads, pipelines, railroads, water transmission and distribution systems, electrical power transmission systems, sewerage systems, and other structures.

In addition to the law governing the filing and removal of mechanic’s and materialmen’s liens (also known as contractor liens), construction law includes contract law, employment law, personal injury law, insurance law, zoning law, and real estate law.

In New Hampshire (NH), construction law encompasses a wide range of legal areas as they relate to the construction industry. This includes the regulation of mechanic's and materialmen's liens, which are legal claims made by contractors and suppliers for payment for work performed or materials provided. NH state statutes outline the process for filing and enforcing these liens, as well as the procedures for their removal once debts are settled. Construction contracts in NH are governed by contract law principles, which dictate the terms and obligations of the parties involved. Employment law is also relevant, as it covers the rights and responsibilities of construction workers and employers, including wage and hour regulations, workplace safety, and workers' compensation. Personal injury law comes into play when there are accidents or injuries on construction sites, with potential liability for negligence or other torts. Insurance law is important for managing risks associated with construction projects, including coverage for property damage, injuries, and professional liability. Zoning and real estate laws in NH affect where and how structures can be built, including compliance with local ordinances and land use regulations. Overall, construction law in NH is a complex interplay of various legal disciplines that collectively govern the construction industry.