Observed arrival · 2026-10-21
The ADU Fee Map
A California guide to ADU fees across 30 cities and counties, with calculators and comparisons for different project sizes.
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✦Pretty
●Pro
◎Niche
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- For
- California homeowners planning a backyard ADU
- Worth noticing
- The project says its fee figures are built from 88 official sources, each saved and quoted.
Field notes
The fee comparison assumes a 2,000-square-foot main home for its 1,000-square-foot detached ADU example. Its ranking separates fees that apply from possible charges shown as upper bounds, while linked tools cover project itemization, total-cost estimates, and county rent and payback figures. The page says its ZIP lookup uses Census ZIP Code Tabulation Areas, which can cross city boundaries.
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○OpenPublic substance visible
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●ProPolished or operationally mature
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