Del. Code tit. 6, § 3682

At the time of or prior to agreeing to final pricing for construction of a new dwelling with a buyer, a builder shall provide the buyer with a copy of written materials prepared and promulgated by the Office of the State Fire Marshal which detail the benefits an automatic fire sprinkler system. At the same time, a builder shall provide written materials including the costs associated with the installation and maintenance of an automatic fire sprinkler system. The buyer shall acknowledge receipt of the written materials in writing. Upon request of the buyer, the builder shall, at the buyer’s expense, install an automatic fire sprinkler system or other requested fire suppression system.