N.H. Rev. Stat. Ann. § 338-A:2

Any provision for or in connection with a contract for construction, reconstruction, installation, alteration, remodeling, repair, demolition, or maintenance work, including without limitation, excavation, backfilling or grading, on any building or structure, whether underground or above ground, or on any real property, including without limitation any road, bridge, tunnel, sewer, water, or other utility line, which requires any party to indemnify any person or entity for injury to persons or damage to property not caused by the party or its employees, agents, or subcontractors, shall be void.