Total Development Cost 2025 New Construction Costs for an Accessory Dwelling Unit (ADU) can range anywhere from $146,500 to $416,500 for the average homeowner. In contrast, converting a single-car garage into an ADU typically costs less, with the total cost typically between $99,750 and $138,750. These estimates include the full range of costs, from design and planning, city fees, construction labor, materials, and finish materials. Understanding … Continue reading Estimated ADU Construction Price 2025