Attention: As of September 29, 2020, the U.S. District Court for the Northern District of California in Immigration Legal Resource Center et al., v. Wolf, et al., 20-cv-05883-JWS, has preliminarily enjoined DHS from implementing or enforcing any part of the USCIS Fee Schedule and Changes to Certain Other Immigration Benefit Request Requirements rule (PDF).
You are required to update your home study under the following circumstances:
Significant Change in Household:
A notable alteration in your household (as defined below).
Change in Child Characteristics:
A change in the number or characteristics (such as age, gender, nationality, special needs, disability, and/or impairment) of the child(ren) you intend to adopt or have adopted, not previously assessed in the home study.