If you are using the Household Account model (the default model) in v3.0 of the Nonprofit Starter Pack (NPSP), your organization can track multiple addresses for each Household out-of-the-box. For each address (ex: seasonal addresses, work addresses, home address, or other addresses you’d like to keep track of for mailings), you can specify the type of address it is, and whether or not the address is the default mailing address for the Household.
Power of Us HUB community member Veronica Beck from Bigger Boat Consulting wrote a series of Knowledge articles about how to best manage Household addresses in NPSP3.0.
Check them out in the Power of Us HUB Knowledge base:
And if you have any comments or questions, login to the HUB and post to the Chatter feed on the Knowledge article.