Interactive Tool
ADU Permit Timeline Tracker
See typical permit-to-certificate-of-occupancy timelines, fee ranges, and the bottlenecks that derail ADU projects in your jurisdiction. Data covers 30 metro markets in California, the Pacific Northwest, Texas, the Mountain West, and the East Coast.
Los Angeles, CA — Detached ADU
Typical permit-to-CO timeline
16-32 weeks
That is roughly 4–8 months from a complete plan submittal to final occupancy, assuming no major bottlenecks.
LADBS uses a ministerial track for code-compliant ADUs. AB 2221 60-day shot clock is enforced but extensions for fire/sewer reviews are common.
Common bottlenecks in Los Angeles
These are the items that most often blow up timelines on ADU projects in this jurisdiction, ordered by impact. Identify which apply to your lot before submitting plans.
Required on hillside lots, expansive soils, or where the ADU is over 1 story. Add 4-8 weeks for engineer scheduling and report.
Triggered when the existing house already has sprinklers, or when ADU exceeds size/distance thresholds in WUI zones. Adds plan review + a separate sprinkler sub.
Discretionary review for setbacks, height variances, or character-area overlays. Avoid by staying within ministerial / by-right standards.
California energy code: full HERS rater, all-electric requirement in many jurisdictions, solar PV trigger for new construction.