Delaware Code Title 25. Property § 5304. Tenant's remedies for failure to supply possession

(1) Upon notice to the landlord, the tenant may terminate the rental agreement at any time the tenant is unable to enter into possession;  and the landlord shall return all moneys paid to the landlord for the rental unit, including any pre-paid rent, pet deposit and security deposit;  and

(2) If such inability to enter is caused wrongfully by the landlord or by anyone with the landlord's consent or license due to substantial failure to conform to existing building and housing codes, the tenant may recover reasonable expenditures necessary to secure equivalent substitute housing for up to 1 month.  In no event shall such expenditures under this subsection exceed the agreed upon rent for 1 month.  Such expenditures may be recovered by appropriate action or proceeding or by deduction from the rent upon the submission of receipts for same.