ADU Cost: Detached, Attached, Garage, and Basement Options
Compare accessory dwelling unit and secondary-suite costs by physical form, independent living functions, sitework, utilities, approvals, and local terminology.
Cross-category index
Secondary-Suite
Browse 3 guides connected by tag “Secondary-Suite”. Use the category label on each result to keep the project scope clear.
Basement Secondary Suite or Basement ADU Conversion Cost
Budget an independent basement suite by separating ordinary finishing from moisture, ceiling height, egress, entrance, kitchen, bath, services, and approval requirements.
Garage-to-ADU Conversion Cost
Understand the cost of converting an attached or detached garage into an independent dwelling, including shell upgrades, kitchen, bath, utilities, access, and approvals.