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
An ADU quote is a detailed breakdown of the costs to build your secondary unit, including site preparation, materials, and labor. Factors like foundation type, utility trenching distance, and interior finish levels will move your total up or down. It provides the financial roadmap for your project. Exact pricing confirmed free on the call.
Frequently asked in Portsmouth
What's involved in finding an accessory dwelling unit contractor in Portsmouth?
Are there affordable accessory dwelling units in Portsmouth?
What are the steps for accessory dwelling unit construction cost in Portsmouth?
What are the permit requirements for an ADU in Portsmouth?
What are the best ADU options for my Portsmouth property?
What ADU services are available in Portsmouth?
How do I find accessory dwelling unit builders near me 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, Downtown Portsmouth, Cradock, Churchland, Prentis Park — and every surrounding area.
Areas we serve
Browse by state, then city.
