Del. Code Ann. tit. 25, § 5402
(b) The certificate required by subsection (a) of this section must include all of the following information:
(c) (1) The failure to obtain and file a certificate prior to the required date is a violation of this section. The Department may assess a civil penalty up to $100 per day per rental unit until the required certificate is obtained and filed with the Department. No civil penalty may be imposed if a certificate deferment is issued by the Department prior to the date on which certification is required.
(2) A certificate deferment may only be issued upon a showing that any of the following circumstances exist: