ADU Costs Range $150K to $400K in 2026
In 2026, constructing an accessory dwelling unit (ADU) typically costs between $150,000 and $400,000, shaped by factors like unit size, location, and customization level. This guide breaks down expenses from permits and foundations to finishes and utilities, highlighting cost-saving options such as DIY elements, prefab designs, and conversions. Discover how to maximize value for rental income or family housing while navigating zoning and regulatory hurdles.



















