Decide what the space needs to do.
Will it be used by family, as a separate residence, or for another purpose? Privacy, access, storage and the relationship to the main house will be different for every brief. Write down what is essential and what would simply be nice to have.
Look beyond the footprint.
The available area is only one part of the picture. Site access, utility connections, existing structures and the conditions of the property can all affect the approach. A photograph or online estimate cannot replace a review of the actual site.
Separate a budget goal from a price quote.
A working budget range helps guide early decisions. A meaningful project estimate needs a defined scope and an understanding of site conditions, design and finishes. Ask what is included, what is excluded and which items still need investigation.
Bring what you already know.
Gather the property location, any drawings or surveys you have, photographs and your main questions. You do not need a completed design to begin a useful conversation.
Confirm requirements with the right jurisdiction.
ADU requirements and review processes can change. Use the current guidance from the city or county responsible for your property, and confirm how it applies to your particular site. This guide is a planning overview, not legal, zoning or engineering advice.
General planning guidance. Project scope, requirements and responsibilities are confirmed individually; this is not a quote or regulatory advice.
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