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ADUs in New Hampshire: Everything You Need to Know About Adding a Accessory Dwelling Unit

If you're considering adding an accessory dwelling unit (ADU) to your property in New Hampshire, you're in luck! ADUs, also known as secondary dwelling units, are becoming increasingly popular in the state as a way to add additional living space, generate rental income, or accommodate aging family members.

What is an ADU?

An ADU is a separate living space on a property that is independent of the main dwelling. ADUs can be attached to the main home (such as in a converted garage) or they can be a standalone structure (such as a tiny house). ADUs are often used as rental units, but they can also be used as a home office, a guest house, or a place for family members to live.

ADUs in New Hampshire

ADUs are a relatively new concept in New Hampshire, but they have been gaining popularity in recent years as a way to increase density in urban areas and provide more affordable housing options. The state has specific zoning laws and regulations that govern the construction and use of ADUs, so it's important to familiarize yourself with these rules before starting a project.

Benefits of ADUs in New Hampshire

There are several benefits to adding an ADU to your property in New Hampshire:

  • ADUs can provide additional living space for family members, guests, or renters.

  • ADUs can be a source of additional income through rentals.

  • ADUs can be a more affordable housing option for low-income or first-time homebuyers.

  • ADUs can increase the value of your property.

Things to Consider Before Adding an ADU in New Hampshire

Before adding an ADU to your property in New Hampshire, there are a few things to consider:

  • Zoning laws: Make sure you understand the zoning laws in your area and whether ADUs are allowed.

  • Size and location: Determine the size and location of your ADU based on the size of your property, your needs, and local regulations.

  • Cost: ADUs can be a significant investment, so it's important to consider the costs of construction, materials, and utilities.

  • Maintenance: ADUs require ongoing maintenance and upkeep, so be prepared to budget for these costs.


ADUs are a great way to add additional living space, generate income, and increase the value of your property in New Hampshire. Before starting a project, it's important to understand the zoning laws and regulations, consider the size and location of your ADU, and budget for the costs of construction and maintenance.


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