Find the exact size limits, setbacks, permit costs, and regulations for building an ADU in your city. 60 cities across 19 states — updated as laws change.
Max size: 900 sq ft · Setbacks: 15 feet
View full ADU rules →Max size: 75% of primary dwelling, up to 1,000 sq ft (minimum 650 sq ft guaranteed) · Setbacks: 20 feet
View full ADU rules →Max size: 1,000 sq ft or 75% of primary dwelling (whichever is less); 500 sq ft for second/third ADU · Setbacks: 25 feet
View full ADU rules →Max size: 1,200 sq ft · Setbacks: 4 ft for units ≤16 ft height
View full ADU rules →Max size: 1,200 sq ft (state minimum; local program caps at 850-1,000 sq ft) · Setbacks: 4 ft minimum
View full ADU rules →Max size: 1,200 sq ft · Setbacks: 4 ft
View full ADU rules →Max size: 1,200 sq ft · Setbacks: 4 ft
View full ADU rules →Max size: 1,200 sq ft · Setbacks: 4 ft
View full ADU rules →Max size: 1,200 sq ft · Setbacks: 4 ft
View full ADU rules →Max size: 1,200 sq ft · Setbacks: 4 ft
View full ADU rules →Max size: 1,200 sq ft · Setbacks: 4 ft
View full ADU rules →Max size: 1,200 sq ft · Setbacks: 4 ft
View full ADU rules →Max size: 1,200 sq ft · Setbacks: 4 ft
View full ADU rules →Max size: 1200 sq ft · Setbacks: 4 ft minimum
View full ADU rules →Max size: 1200 sq ft; may reduce to 800 sq ft if lot coverage exceeded · Setbacks: 4 ft maximum (detached new construction)
View full ADU rules →Max size: 1200 sq ft; reduces to 800 sq ft if lot coverage exceeded · Setbacks: 4 ft minimum (detached new construction)
View full ADU rules →Max size: 1200 sq ft · Setbacks: 4 ft minimum (detached new construction)
View full ADU rules →Max size: 1200 sq ft · Setbacks: 4 ft minimum (detached new construction)
View full ADU rules →Max size: 864 sq ft · Setbacks: Must be within rear 35% of lot; 5 ft minimum rear setback
View full ADU rules →Max size: 50% of principal dwelling or 1,250 sq ft (whichever is less); 750 sq ft max if principal < 1,500 sq ft · Setbacks: 12 feet
View full ADU rules →Max size: 800 sq ft (market-rate); 1,000 sq ft (affordable ADU program) · Setbacks: 10 feet
View full ADU rules →Max size: 400-800 sq ft (varies by district) · Setbacks: 5 ft (RU-1 district)
View full ADU rules →Max size: 950 sq ft maximum (750 sq ft threshold affects setback requirements) · Setbacks: 3 ft (ADUs ≤750 sq ft); 15-20 ft (ADUs >750 sq ft, varies by district)
View full ADU rules →Max size: 500-1,000 sq ft (varies by district and sector) · Setbacks: 15 feet
View full ADU rules →Max size: 25% of primary residence or 750 sq ft (whichever is smaller) · Setbacks: 20 feet
View full ADU rules →Max size: 1,300 sq ft or 16% of lot area (whichever greater); max 1,600 sq ft or size of primary dwelling (whichever less) · Setbacks: 3 ft (5 ft from alleys for above-garage ADUs)
View full ADU rules →Max size: 800 sq ft or 75% of principal dwelling floor area (whichever greater) · Setbacks: 3 ft from interior lot lines
View full ADU rules →Max size: 800 sq ft or 75% of primary (whichever is less) · Setbacks: 5 feet
View full ADU rules →Max size: 1,100 sq ft · Setbacks: 10 feet
View full ADU rules →Max size: 1,050 sq ft · Setbacks: 12 feet
View full ADU rules →Max size: 800 sq ft (first ADU); 500 sq ft (second ADU) · Setbacks: 10 feet
View full ADU rules →Max size: 1,350 sq ft or 0.15 FAR (whichever is smaller; updated by HOME Phase 2, May 2024) · Setbacks: 10 feet
View full ADU rules →Max size: 1,200 sq ft · Setbacks: 15 feet
View full ADU rules →Max size: 900 sq ft · Setbacks: 15 feet
View full ADU rules →Max size: 800 sq ft · Setbacks: 20 feet
View full ADU rules →Max size: 1,000 sq ft · Setbacks: 15 feet
View full ADU rules →Max size: 1,200 sq ft · Setbacks: 5 feet
View full ADU rules →Max size: 1,100 sq ft · Setbacks: 10 feet
View full ADU rules →Max size: 1,000 sq ft · Setbacks: 15 feet
View full ADU rules →Max size: 1,050 sq ft · Setbacks: 10 feet
View full ADU rules →Accessory Dwelling Units are one of the smartest investments homeowners can make.
Earn $1,000-$4,000+ per month in rental income depending on your market. Many homeowners cover their entire mortgage payment with ADU rent.
ADUs typically increase property value by $100,000-$300,000 — often more than the construction cost. A smart investment that pays for itself.
House aging parents, adult children, or guests. Use it as a home office. The flexibility of an ADU adapts to your life as it changes.
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Every new California ADU law change — coastal permits streamlined, deemed-approved provisions, and JADU updates.
Read article → LegislationFlorida now requires all cities to allow ADUs by December 2026. What Miami, Jacksonville, Tampa homeowners need to know.
Read article → GuideCosts ($80K-$180K), permits, impact fee savings, and the step-by-step process for converting your garage into an ADU.
Read guide → Guide8-step checklist to determine if your property qualifies for an ADU — zoning, lot size, setbacks, HOA rules, and more.
Check eligibility →Get free quotes from pre-vetted ADU contractors in your area. Compare prices, timelines, and reviews.
Get Free Quotes →Complete beginner's guide to Accessory Dwelling Units — types, benefits, costs, and regulations explained.
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Explore options →Estimate your total ADU cost including construction, permits, design, and utilities by city and type.
Calculate costs →Detached, attached, garage conversion, basement, JADU, or prefab — learn which ADU type is right for you.
Compare types →Navigate the permitting process step by step — applications, timelines, inspections, and common pitfalls.
Read guide →Factory-built ADUs can save 20-40% and cut timelines in half. Compare top manufacturers and models.
Explore prefab →