N.H. Rev. Stat. Ann. § 480:8-a

The superior court, upon petition of the owner of a homestead or the wife or husband surviving such owner, or upon petition of a judgment creditor and such notice as it may order, may appoint appraisers and cause the homestead right to be set off, and a record of the proceedings being made in the registry of deeds, the right shall be established as against all persons.