ADU Planning Tools
Use practical planning tools to organize decisions before you spend heavily on design or construction. Each tool shows the assumptions behind its output and where local verification is still required.
Live tool
ADU State Rules Lookup
Select any U.S. state or Washington, D.C. and pull the current state-law layer directly from the ADU Project Planner regulatory database, including size, setbacks, parking, owner occupancy, rental rules, permitting and source links.
Tools being built
- ADU property feasibility checker
- ADU cost estimator
- Setback and site-fit worksheet
- Financing and payment calculator
- Rental and ROI calculator
- Permit checklist generator
- Contractor bid comparison tool
- Project planning checklist
The goal is to help homeowners ask better questions, compare options consistently, and identify missing information earlier in the project.