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ADU Cost Calculator
Detached ADU: Detached ADU: Detached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.50-$450/sqft. Attached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.5K-$40K. This calculator sizes. ADU economics often depend heavily on local jurisdiction: California's SB9/SB8 laws have slashed permit timelines and fees for qualified projects. Pre-approved plan programs in many cities cut design cost 40-60%. Utility tap fees are the single largest wild card and should be researched with local agencies before committing to a budget — often Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.0K-$25K of total cost lives here alone.50-$450/sqft. Attached ADU: Detached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.50-$450/sqft. Attached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.5K-$40K. This calculator sizes. ADU economics often depend heavily on local jurisdiction: California's SB9/SB8 laws have slashed permit timelines and fees for qualified projects. Pre-approved plan programs in many cities cut design cost 40-60%. Utility tap fees are the single largest wild card and should be researched with local agencies before committing to a budget — often Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.0K-$25K of total cost lives here alone.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.50-$450/sqft. Attached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.5K-$40K. This calculator sizes. ADU economics often depend heavily on local jurisdiction: California's SB9/SB8 laws have slashed permit timelines and fees for qualified projects. Pre-approved plan programs in many cities cut design cost 40-60%. Utility tap fees are the single largest wild card and should be researched with local agencies before committing to a budget — often Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.0K-$25K of total cost lives here alone.5K-$40K. This calculator sizes.50-$450/sqft. Attached ADU: Detached ADU: Detached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.50-$450/sqft. Attached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.5K-$40K. This calculator sizes. ADU economics often depend heavily on local jurisdiction: California's SB9/SB8 laws have slashed permit timelines and fees for qualified projects. Pre-approved plan programs in many cities cut design cost 40-60%. Utility tap fees are the single largest wild card and should be researched with local agencies before committing to a budget — often Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.0K-$25K of total cost lives here alone.50-$450/sqft. Attached ADU: Detached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.50-$450/sqft. Attached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.5K-$40K. This calculator sizes. ADU economics often depend heavily on local jurisdiction: California's SB9/SB8 laws have slashed permit timelines and fees for qualified projects. Pre-approved plan programs in many cities cut design cost 40-60%. Utility tap fees are the single largest wild card and should be researched with local agencies before committing to a budget — often Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.0K-$25K of total cost lives here alone.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.50-$450/sqft. Attached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.5K-$40K. This calculator sizes. ADU economics often depend heavily on local jurisdiction: California's SB9/SB8 laws have slashed permit timelines and fees for qualified projects. Pre-approved plan programs in many cities cut design cost 40-60%. Utility tap fees are the single largest wild card and should be researched with local agencies before committing to a budget — often Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.0K-$25K of total cost lives here alone.5K-$40K. This calculator sizes.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: Detached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.50-$450/sqft. Attached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.5K-$40K. This calculator sizes. ADU economics often depend heavily on local jurisdiction: California's SB9/SB8 laws have slashed permit timelines and fees for qualified projects. Pre-approved plan programs in many cities cut design cost 40-60%. Utility tap fees are the single largest wild card and should be researched with local agencies before committing to a budget — often Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.0K-$25K of total cost lives here alone.50-$450/sqft. Attached ADU: Detached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.50-$450/sqft. Attached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.5K-$40K. This calculator sizes. ADU economics often depend heavily on local jurisdiction: California's SB9/SB8 laws have slashed permit timelines and fees for qualified projects. Pre-approved plan programs in many cities cut design cost 40-60%. Utility tap fees are the single largest wild card and should be researched with local agencies before committing to a budget — often Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.0K-$25K of total cost lives here alone.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.50-$450/sqft. Attached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.5K-$40K. This calculator sizes. ADU economics often depend heavily on local jurisdiction: California's SB9/SB8 laws have slashed permit timelines and fees for qualified projects. Pre-approved plan programs in many cities cut design cost 40-60%. Utility tap fees are the single largest wild card and should be researched with local agencies before committing to a budget — often Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.0K-$25K of total cost lives here alone.5K-$40K. This calculator sizes.5K-$40K. This calculator sizes. ADU economics often depend heavily on local jurisdiction: California's SB9/SB8 laws have slashed permit timelines and fees for qualified projects. Pre-approved plan programs in many cities cut design cost 40-60%. Utility tap fees are the single largest wild card and should be researched with local agencies before committing to a budget — often Detached ADU: Detached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.50-$450/sqft. Attached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.5K-$40K. This calculator sizes. ADU economics often depend heavily on local jurisdiction: California's SB9/SB8 laws have slashed permit timelines and fees for qualified projects. Pre-approved plan programs in many cities cut design cost 40-60%. Utility tap fees are the single largest wild card and should be researched with local agencies before committing to a budget — often Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.0K-$25K of total cost lives here alone.50-$450/sqft. Attached ADU: Detached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.50-$450/sqft. Attached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.5K-$40K. This calculator sizes. ADU economics often depend heavily on local jurisdiction: California's SB9/SB8 laws have slashed permit timelines and fees for qualified projects. Pre-approved plan programs in many cities cut design cost 40-60%. Utility tap fees are the single largest wild card and should be researched with local agencies before committing to a budget — often Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.0K-$25K of total cost lives here alone.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.50-$450/sqft. Attached ADU: Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.00-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.5K-$40K. This calculator sizes. ADU economics often depend heavily on local jurisdiction: California's SB9/SB8 laws have slashed permit timelines and fees for qualified projects. Pre-approved plan programs in many cities cut design cost 40-60%. Utility tap fees are the single largest wild card and should be researched with local agencies before committing to a budget — often Detached ADU: $150-$450/sqft. Attached ADU: $100-$300/sqft. Garage conversion ADU: $60-$200/sqft. Permits, utilities, landscaping adds $15K-$40K. This calculator sizes.0K-$25K of total cost lives here alone.5K-$40K. This calculator sizes.0K-$25K of total cost lives here alone.
Total ADU cost
$208,000
Construction cost
$180,000
How the math works
600 sqft detached ADU at $300/sqft = $180K + $8K permits + $15K utilities + $5K landscaping = $208K all-in.
CA has streamlined ADU approvals (SB9, SB8). Many other states and cities have followed. Check local ADU program before starting design — can save $20K-$50K via pre-approved plans or fee waivers.
How to Use
- Pick ADU type and sqft.
- Add fees, utilities, landscaping.
- See total cost.
Frequently Asked Questions
Which ADU type cheapest?
Garage conversion: lowest cost, fastest (2-4 months). Existing structure = less foundation/framing. Attached: mid. Detached new-build: most expensive but highest rental value and flexibility.
Permit and utility fees?
Permits $2K-$10K. Utility connections: $5K-$25K (sewer/water tap fees). Impact fees $2K-$15K in some CA cities. Add $15K-$50K total in fees before you buy lumber.
Financing?
ADU construction loan, HELOC, cash-out refi. Some states have ADU-specific programs (CA has CalHFA ADU Grant Program up to $40K). Start with the state and city resource office.
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