ADU rules, shed permits, and garage conversion regulations.
Accessory Structures rules vary widely between U.S. cities and counties. What is permitted in one jurisdiction may carry fines or require permits in another. These differences matter whether you are a homeowner, renter, landlord, or business owner.
We research each city's municipal code, official department guidelines, and council records to summarize the rules that affect daily life. Every entry links to the original source so you can verify the details yourself. Browse the topics below to explore specific accessory structures regulations by city.
Rules for building accessory dwelling units (granny flats, in-law suites) including size limits, parking requirements, and owner-occupancy rules.
How to apply for an ADU building permit: application steps, plan-check requirements, review timelines, ministerial vs discretionary review, and which department to file with.
Impact fees, school fees, utility hookup charges, and waivers for ADUs. Many jurisdictions exempt ADUs under 750 sq ft from impact fees per state law.
Whether the property owner must live on-site to operate an ADU, deed-restriction requirements, and recent state-law changes lifting owner-occupancy rules.
Whether an ADU can be rented short-term (Airbnb), 30-day minimums, separate rental licenses, and long-term lease requirements.
When you need a permit for a storage shed, maximum sizes that are exempt from permits, and how far sheds must be from property lines.
Common questions about accessory structures in the United States.