Additional Dwelling Units
Additional Dwelling Units, or ADU’s, are becoming more and more popular. Sometimes referred to as an in-law suite or granny pod, ADU’s are an additional living space on your property. ADU’s can be part of the main house structure, attached with a separate entrance, or an entirely separate structure on your property. Thanks to new law signed into effect by Governor Ayotte in 2025 via House Bill 577, the state now requires that municipalities allow at least one ADU on a property that is designated for single family living. What does that mean for you? If you own a single family home, you have the right to build an ADU! There are a few guidelines and things to consider still, but the red tape that was once an issue has all but been eliminated. Below are some factors to consider when planning your ADU.
Size - Municipalities are required to let you build an ADU of at least 750 square feet of living space and up to 950 square feet, sometimes more depending on the town.
Setbacks - ADU’s are subject to the same building lot setbacks as standard residential construction.
Septic - ADU’s can be tied into existing septic systems, HOWEVER, the septic system will need to be reviewed by a licensed septic designer and confirm the system is capable of supporting the extra load on the system.
Why Work With Us?
Additional Dwelling Units are a great way to accomplish multiple hurdles while benefiting the value of your property. Many ADU’s are used as in-law apartments for parents or grandparents who may need assistance. Rather than an assisted living facility, your loved ones can live right next door, close to your help. The added expense of an ADU often pays for itself in 5-10 years! Costs that would have otherwise been lost to a facility, have now been used to increase your property’s value!
-
With over a decade in the residential and commercial construction industry, we have the knowledge and experience to complete your project. From the initial design to the final occupancy inspection, we guide you through the process and make the construction as seamless and nonintrusive as possible.
-
Construction is a hands on process. All new projects start with a quick phone call or email, but it is important that a site visit follows soon after. We will meet with you at your property to discuss different options and potential build locations/connections. Taking into account the architectural design of your current home, we will sketch up a rough plan of how an attached or detached ADU might look. The same effort that goes into a home should go into an ADU, since it is a home! After our initial site meeting, we will set up another appointment to dig deeper into the design. At our office we can work through the floor plan, exterior aesthetics, utilities, and interior finishes. Based on the final design and finishes, we will be able to get you the estimate for your new ADU. When we go into contract on the new build, we will apply for permits, and send the building out for engineered plans if required by the town. Construction timeline should be around 6 months from contract to completion.
-
Whether you are a home owner looking to add a new space, or building a brand new home, we are happy to work with everyone! We cover the entire state of NH regarding ADU’s
-
There are a multitude of factors that go into the cost of construction, however, most projects land somewhere between $250 and $350 per square foot, as the all in cost to build. As an average, you might expect to spend $225,000 for a 750 square foot ADU.