Accessory Dwelling Units

PS21 is pleased to partner with the New Hampshire Housing Finance Authority to bring Kol Peterson to Portsmouth. Mr. Peterson is one of the country’s foremost experts on accessory dwelling units. He will be presenting  on Tuesday October 2 at 7 PM at the 3S Artspace. Please register online in order to ensure sufficient seating.

 An ADU can benefit you by being a self-contained apartment for a family member, a caregiver, or to use as a rental unit for additional income. Accessory Dwelling Units (ADUs) – also known as granny flats, inlaw suites, and accessory apartments – are allowed in all New Hampshire communities by state statute. Accessory to the primary house on the property, whether attached to it (above a garage, on the side of the house, in an attic or basement) or detached (a converted garage or barn or new construction). 

Peterson’s book, Backdoor Revolution-The Definitive Guide to ADU Development, is the authoritative book about accessory dwelling units to date. It’s written for planners, ADU advocates, and homeowners who aspire to build ADUs. 

Peterson will cover the process of designing and building an ADU, and considerations including costs, financing, permitting, design, rental models, and more. He’ll also delve into why expanding the inventory of ADUs in New Hampshire will help homeowners, would-be renters, downsizers, and the availability of affordable housing for our state’s workforce and communities.

The event is presented by the New Hampshire Housing Finance Authority, and co-hosted by the Workforce Housing Coalition of the Greater Seacoast and PS21. The event’s lead sponsor is AARP. The Lodging Sponsor is The Sailmaker’s House. Event Partners are the Seacoast Media Group,, 3S Artspace, Coruway Film Institute, Riverwoods Durham, and Ambit Engineering.

Following the presentation, we will reserve ample time for questions and discussion. The event is free and all are welcome. Please register online in order to ensure sufficient seating.

Purchase Backdoor Revolution-The Definitive Guide to ADU Development online for $10 (a 60% discount) and pick it up at the event.

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