Del. Code Ann. tit. 24, § 2938
(b) The consumer information statement required by this chapter shall be delivered to the consumer no later than the earlier of:
unless the consumer has already been given the CIS by another licensee. A listing licensee who knows that the buyer is working with another licensee is not required to give that buyer a CIS. A licensee working with a buyer who knows that the seller is working with another licensee is not required to give a CIS to that seller. The CIS must be signed by the customer or client prior to signing an agreement of sale, listing agreement or any other brokerage agreement, unless otherwise exempt from providing a CIS.
(d) The duties of confidentiality as required by § 2936(c) of this title begin upon the first contact between a licensee and the customer. The other statutory duties between a licensee and client as required by this subchapter begin upon the earlier of:
unless a CIS is signed indicating there is no agency relationship. For transactions exempt from providing the CIS, the duties of the agent commence when the parties form an agency relationship.
(f) Transactions of properties other than those marketed as:
are exempt from the requirement to provide the CIS to the potential parties; however the balance of this chapter shall still apply unless specifically exempted. In lieu of providing a CIS, the agreement of sale or lease shall include the following language after the confirmation of the agency relationships:
“The parties acknowledge that they have certain rights and responsibilities under Delaware agency law (Title 24 of the Delaware Code, Chapter 29) and may consult with their legal counsel.”
(g) For rental of residential property not otherwise exempt from the requirement to provide the CIS, the CIS shall be given to the potential tenant no later than the earlier of:
but does not need to be signed until the potential tenant decides to complete a rental application or the signing of a lease.
75 Del. Laws, c. 277, § 6; 76 Del. Laws, c. 258, §§ 3, 4, 10; 78 Del. Laws, c. 166, § 1