I am currently working in a Communities environment using the NonProfit Success Pack and had a question. Will creating a contact also create a 1:1 Household contact?
In a Nonprofit Success Pack context, the answer depends on the Account Model in which you are operating.
New installs of the NPSP use the Household Account Model. In this model, creating a Contact which is not associated with an Account at the time of creation will result in the NPSP automatically creating a Household Account and associating the Contact to that Household Account.
You create a Household Account by creating a contact in Salesforce. That is to say, whenever you create a Contact record, Salesforce automatically creates a Household for you.
You would also see an Account record being created if you are using the NPSP's older 1-to-1 Account Model. The Household is a separate object in the 1-to-1 Account Model.