Introduction
ADU planning has its pitfalls. Avoiding these common mistakes can save you time, money, and headaches.
Mistake #1: Skipping Feasibility & Zoning Research
Don’t assume your lot can support the ADU you envision — setbacks, lot coverage, height limits, and utility access can all block your design.
Mistake #2: Underbudgeting For Hidden Costs
Excavation, grading, utility hookups, soil testing, structural reinforcements, and permitting fees often go unaccounted.
Mistake #3: Ignoring Mechanical & Utility Coordination
Late changes to plumbing, electrical, HVAC, or drainage can derail design. Plan these systems early and ensure they integrate with structural design.
Bonus Mistake: Overimproving for the Neighborhood
You don’t always have to match the most expensive finishes — balance quality with neighborhood norms so your ADU doesn’t feel out of place.
With careful planning you can avoid costly mistakes and launch a smoother ADU project.
Let us help you plan the right ADU from day one.