1. Confirm which property and agency you are dealing with
An address is a starting point, not the complete property record. The parcel, jurisdiction, existing use, and available building records should agree before anyone relies on a design assumption.
This does not require solving the whole project. It requires knowing which sources matter and recording what remains uncertain.
2. Separate the proposed ADU from the building that already exists
A detached unit on open ground and a conversion inside an older garage are not the same kind of assignment. Existing walls, foundations, ceiling heights, openings, utilities, access, and prior work can change what the permit set must address.
- What is confirmed by records?
- What is visible but unverified?
- What must be measured?
- What may require a consultant?
3. Build a whole-project budget, not a plans-only budget
Drawing fees are only one part of an ADU project. Consultants, agency fees, utilities, demolition, site work, construction, and contingency belong in the same decision frame.
A homeowner does not need a perfect construction price before plans. They do need enough financial context to know whether the direction still makes sense.
4. Decide what the ADU must accomplish
The right path depends on the outcome: family housing, rental income, flexibility, speed, privacy, or long-term property use. When the priorities are unclear, the design can become a collection of preferences without a decision rule.
A useful first engagement should clarify the property, the intended outcome, the major unknowns, and the next responsible step.
Before buying drawings, make the property assumptions, project purpose, and major cost exposures visible enough to choose the right scope.
This article provides general educational information. Property records, field conditions, consultant requirements, and jurisdiction review may change the answer for a specific project.