Adu construction — New Haven, CT
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 New Haven
What should I know about detached accessory dwelling units in New Haven?
How can I make an ADU affordable in New Haven?
What are the rules for in-law suites in New Haven?
How much does an ADU cost in New Haven?
Are prefab ADUs a good option in New Haven?
What ADU services are available in New Haven?
How do I get an ADU estimate in New Haven?
Also serving nearby: Bridgeport · Waterbury · Norwalk · Hartford · Stamford
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of New Haven — population 135,319; about 7,240 residents per square mile across 18.7 sq mi. ZIP codes covered include 06501, 06502, 06503, 06504, 06505, 06506, 06507, 06508.
Neighborhoods served in New Haven: Downtown New Haven, East Rock, Wooster Square, Newhallville, Fair Haven — and every surrounding area.
Areas we serve
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