Accessory dwelling unit new hampshire — Portsmouth, VA
Last updated: September 24, 2026
What affects the price
Building an ADU involves several moving parts that shape your total investment. The final figure depends heavily on whether you choose a prefab unit or a custom build from the ground up. Site conditions are another major factor; if your property requires extensive grading, utility trenching, or foundation work, costs will climb. You also have to consider your choice of finishes, like high-end appliances or custom cabinetry. Navigating local permit fees and impact assessments also adds to the total.
About this service
Frequently asked in Portsmouth
How can I get an ADU quote in Portsmouth?
What are accessory dwelling units (ADUs) and how do they apply in Portsmouth?
What are the construction costs for an ADU in Portsmouth?
How do I find an ADU company in Portsmouth?
What should I consider for homes with in-law suites in Portsmouth?
What is involved in ADU accessory dwelling unit construction in Portsmouth?
What is the best accessory dwelling unit for my Portsmouth property?
Also serving nearby: Norfolk · Chesapeake · Hampton · Newport News · Virginia Beach
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Portsmouth — population 96,793; about 2,906 residents per square mile across 33.3 sq mi. ZIP codes covered include 23701, 23702, 23703, 23704, 23705, 23707, 23708, 23709.
Neighborhoods served in Portsmouth: Olde Towne, Midtown, Chesapeake Bay, Greenbrier, South Norfolk — and every surrounding area.
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