An Accessory Dwelling Unit (ADU) is a residential unit located on a lot containing a single-family home that provides an independent living space for one or more people. To qualify as a separate living space, an ADU must include areas for sleeping, eating, cooking, and sanitation. ADUs may be located within, attached to, or detached from the primary home.
Looking for a quick overview?
Download our one-page ADU fact sheet for key insights on how ADUs benefit homeowners, renters, and communities.
Considering an ADU For Your Property?
Explore our comprehensive guide for key considerations when planning your project. This guide covers ADU types, design and layout, options, financing considerations, and permitting information. Three appendices provide additional detail on specific topics to support your planning process.
Accessory Dwelling Units: A Guide for NH Homeowners
- Appendix A: Find Professionals & Trades
- Appendix B: Lenders & ADU Products
- Appendix C: Commonly Required Permit Information
- Appendix D: More ADU Resources
- ADU Success Stories Across New Hampshire