Delaware A C D F G H I K L M N O P R S T U V W Delaware Construction Litigation Hold 10 Del. C. § 8127Substantial completion of improvement to real property.Online ReferenceNational Society of Professional Engineers Home Online Reference State Statute for Construction: 6 Years*The National Society of Professional Engineers Recommends an Additional: 3 YearsRecommended Document Retention 9 Years If you would like to learn the statute of limitations of any warranty your state entitles you to, refer to our Warranties map.