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
Financing an ADU involves finding a loan product that uses your home's equity or projected rental income to fund the build. You need this if you don't have the full cash amount upfront. Options include renovation loans, home equity lines of credit, or personal loans. Exact pricing confirmed free on the call.
Frequently asked in Portsmouth
What are accessory dwelling units (ADUs) in Portsmouth?
What is the accessory dwelling unit construction cost in Portsmouth?
What's the best ADU to build in Portsmouth?
What are homes with in-law suites like in Portsmouth?
What's involved in ADU construction in Portsmouth?
What's the best accessory dwelling unit for my property in Portsmouth?
What are the options for a prefab ADU in Portsmouth?
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, Cradock, Waterview, Prentis Park, Olive Branch — and every surrounding area.
Areas we serve
Browse by state, then city.
