Detached ADU, attached ADU or garage conversion?

Compare the property consequences

A detached unit may create separation but use outdoor space. An attached ADU connects to the existing home. A garage conversion reuses an enclosure while changing its current storage or parking use. None is automatically the best fit or lowest-cost option.

Questions for each option

Detached

Where does it sit, how is it reached, and where do utilities run?

Attached

How does the connection affect the existing structure, privacy and circulation?

Garage conversion

What is the condition of the existing enclosure, and what replaces its current use?

Draw more than the unit

Mark the main home, outdoor areas to retain, access routes, existing utility information and potential construction staging. Consider how occupants reach the unit and how windows relate to the main home. Keep property constraints visible while comparing floor plans.

Separate observations from investigations

Photographs and an initial visit can identify questions, but they do not replace a survey, structural review or utility assessment where those are needed. Record the information still required before committing to a format.

Confirm the jurisdiction and next step

Review the current requirements with the permitting authority for the parcel. A neighboring project or a standard plan does not establish approval for your site. Bring the address, intended use and available records to the first project conversation.