New Hampshire A C D F G H I K L M N O P R S T U V W New Hampshire Construction Litigation Hold N.H. Rev. Stat. Ann. § 508: 4-bSubstantial completion of improvement to real property.Online ReferenceNational Society of Professional Engineers Home Online Reference State Statute for Construction: 2 Years*The National Society of Professional Engineers Recommends an Additional: 3 YearsRecommended Document Retention 5 Years If you would like to learn the statute of limitations of any warranty your state entitles you to, refer to our Warranties map.