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Permitting · 7 min read · May 24, 2026 · 167 words

San Jose ADU permitting: the South Bay playbook

San Jose has one of the faster ADU plan-check timelines in California — and the most aggressive pre-approved plans program in the Bay Area.

Key takeaways

  • San Jose has invested heavily in ADU process simplification.
  • The city operates a Pre-Approved ADU Plans program that can compress permit timelines to under 30 days for qualifying lots.
  • For custom designs, expect 10–16 weeks.

Answered in this guide

Jump straight to the question you came in with — every answer is on this page, with links onward to the deeper guide.

  1. What is SB-9 and does it apply to me?
  2. What about hillside or coastal lots?
  3. I'm in an HPOZ — can I still build?
  4. Do you handle the permitting?
  5. What setbacks and height limits apply?
  6. How long does an ADU project take in Los Angeles?

More across the studio · the full FAQ map · the reference desk

San Jose has invested heavily in ADU process simplification. The city operates a Pre-Approved ADU Plans program that can compress permit timelines to under 30 days for qualifying lots. For custom designs, expect 10–16 weeks.

Pre-approved plans pathway

San Jose maintains a catalog of vetted ADU designs from participating architects. Choose a plan, verify lot suitability, pay reduced plan-check fees, and receive a permit in as little as 3–4 weeks. Best for: standard flat lots, no hillside or flood-zone issues.

Custom-design pathway

For non-standard lots or owners who want a custom architectural design, San Jose's standard ADU plan check runs 10–16 weeks. Fees: $5,200–$9,400 depending on size and complexity.

Lot coverage and FAR

San Jose enforces lot coverage and FAR limits that can interact with ADU sizing on smaller lots. Verify your buildable envelope before committing to a design — the Bay Area cost anatomy covers the design implications.

Sources

  1. City of San Jose — ADU Information · City of San José
  2. California HCD — ADU Handbook · California HCD

Next chapter · 01 of 03

Permitting · 7 min read

Oakland ADU permitting: rules, fees, and timeline

Oakland's pathway is comparable on timeline but different on fees and inspections.

Oakland runs one of the more streamlined ADU programs in the Bay Area. What to expect on plan check, impact fees, and parking.

FAQ · Permitting

Common questions on permitting

The questions readers send us most after this guide.

  1. What is SB-9 and does it apply to me?
    SB-9 (the California HOME Act) lets eligible single-family lots split into two parcels and/or add a duplex. We assess eligibility during the feasibility call — roughly 60% of LA single-family lots qualify on paper, fewer in practice once HPOZ, hillside, and coastal overlays are applied. SB-9 projects can stack with an ADU for up to four units on what was a single-family lot.
  2. What about hillside or coastal lots?
    Hillside requires a Methane District review (where applicable) plus a haul route plan if grading exceeds 1,000 cubic yards. Coastal Zone projects (anything west of Lincoln Blvd in Venice, for example) need a Coastal Development Permit on top of standard LADBS approval. Both are workable; both add 60–90 days.
  3. I'm in an HPOZ — can I still build?
    Yes, but with design review. Historic Preservation Overlay Zones require Certificate of Appropriateness from the cultural heritage commission before permits issue. We've shepherded projects through Miracle Mile, West Adams, Whitley Heights, and Spaulding Square HPOZs. Add 8–12 weeks for the COA process.
  4. Do you handle the permitting?
    Yes. We file with LADBS or your local building department, manage plan check, coordinate utility upgrades, schedule inspections, and deliver final sign-off. You don't visit the counter, we do.
  5. What setbacks and height limits apply?
    Statewide ADU law (AB 68/881) overrides most local restrictions: 4-foot side and rear setbacks, 16-foot height for detached one-story, 18-foot for two-story within ½ mile of transit. Front setbacks follow the underlying zone. We model your envelope at the schematic stage.
  6. How long does an ADU project take in Los Angeles?
    Most detached ADUs run 9–13 months from contract to certificate of occupancy. Garage conversions are typically 4–6 months. Permitting alone is usually 60–120 days at LADBS depending on whether we use a pre-approved standard plan or a custom design that needs full plan check.

Reference desk · Permitting

More answers from the California reference desk

City-specific questions pulled from our 5,000-answer FAQ corpus — every link opens a deeper desk page.

Browse the full reference desk →

  1. How long does a ADU permit take in San Francisco?
    City of San Francisco Planning & Building runs plan check 150–240 days on a complete, code-conformant submittal for a ADU. First-cycle approvals depend on three things: a stamped structural set, a Title 24 energy report bound into the package, and a site plan with verified setbacks. Most slippage comes from missing one of those three on first submittal.
  2. Who is the permitting authority for a ADU in San Francisco?
    Plan check, building permits, and final inspections go through City of San Francisco Planning & Building. For state-law ADU scopes there is no discretionary design review — submit to the building counter and timelines are governed by California Government Code §65852.2 ministerial requirements. Outside of pure state ADU law (additions, full remodels, hillside scopes), expect at least one planning-zoning touch.
  3. Why do ADU permits get rejected in San Francisco?
    In San Francisco, the five most common first-cycle corrections are: (1) Title 24 energy compliance not bound to the submittal, (2) site plan setback math off by inches, (3) structural calcs not stamped by a CA-licensed engineer, (4) utility load calculations missing for the panel upgrade, and (5) drainage/grading not addressed for impervious-surface adds. Fixing all five before submittal cuts 150–240 days off the schedule.
  4. Does state ADU law override San Francisco rules for my ADU?
    For qualifying ADU and JADU scopes, California Government Code §65852.2 and §65852.22 preempt most local discretionary review — San Francisco cannot impose owner-occupancy requirements (banned by AB 976), most parking minimums near transit, or stylistic design review. Local jurisdictions still control building-code application, Title 24, utility connection, and impact fee schedules. Non-ADU scopes (full additions, remodels, hillside builds) remain fully under local control.
  5. Are pre-approved standard plans available in San Francisco for a ADU?
    Where San Francisco has adopted a pre-approved standard ADU plan program, using one cuts plan check by 30–60 days and removes the structural review fee. For programs that exist (LADBS, San Jose, San Diego), the trade-off is that floor-plan changes void the pre-approval. Most owners are better off using a standard plan as a starting point and accepting the layout it ships with.
  6. How long does a garage conversion permit take in San Francisco?
    City of San Francisco Planning & Building runs plan check 150–240 days on a complete, code-conformant submittal for a garage conversion. First-cycle approvals depend on three things: a stamped structural set, a Title 24 energy report bound into the package, and a site plan with verified setbacks. Most slippage comes from missing one of those three on first submittal.
  7. Who is the permitting authority for a garage conversion in San Francisco?
    Plan check, building permits, and final inspections go through City of San Francisco Planning & Building. For state-law ADU scopes there is no discretionary design review — submit to the building counter and timelines are governed by California Government Code §65852.2 ministerial requirements. Outside of pure state ADU law (additions, full remodels, hillside scopes), expect at least one planning-zoning touch.
  8. Why do garage conversion permits get rejected in San Francisco?
    In San Francisco, the five most common first-cycle corrections are: (1) Title 24 energy compliance not bound to the submittal, (2) site plan setback math off by inches, (3) structural calcs not stamped by a CA-licensed engineer, (4) utility load calculations missing for the panel upgrade, and (5) drainage/grading not addressed for impervious-surface adds. Fixing all five before submittal cuts 150–240 days off the schedule.
  9. Does state ADU law override San Francisco rules for my garage conversion?
    For qualifying ADU and JADU scopes, California Government Code §65852.2 and §65852.22 preempt most local discretionary review — San Francisco cannot impose owner-occupancy requirements (banned by AB 976), most parking minimums near transit, or stylistic design review. Local jurisdictions still control building-code application, Title 24, utility connection, and impact fee schedules. Non-ADU scopes (full additions, remodels, hillside builds) remain fully under local control.
  10. Are pre-approved standard plans available in San Francisco for a garage conversion?
    Where San Francisco has adopted a pre-approved standard ADU plan program, using one cuts plan check by 30–60 days and removes the structural review fee. For programs that exist (LADBS, San Jose, San Diego), the trade-off is that floor-plan changes void the pre-approval. Most owners are better off using a standard plan as a starting point and accepting the layout it ships with.
  11. How long does a JADU permit take in San Francisco?
    City of San Francisco Planning & Building runs plan check 150–240 days on a complete, code-conformant submittal for a JADU. First-cycle approvals depend on three things: a stamped structural set, a Title 24 energy report bound into the package, and a site plan with verified setbacks. Most slippage comes from missing one of those three on first submittal.
  12. Who is the permitting authority for a JADU in San Francisco?
    Plan check, building permits, and final inspections go through City of San Francisco Planning & Building. For state-law ADU scopes there is no discretionary design review — submit to the building counter and timelines are governed by California Government Code §65852.2 ministerial requirements. Outside of pure state ADU law (additions, full remodels, hillside scopes), expect at least one planning-zoning touch.

Sources & further reading

  • California Government Code §65852.2 — statewide ADU framework (ministerial review, 60-day clock).
  • LADBS — Accessory Dwelling Unit information bulletins and current permit fee schedule.
  • HCD — California Department of Housing & Community Development, ADU handbook (2024 update).
  • Internal data: 120++ ADU projects delivered across Los Angeles County, 2018–2025.

Continue your read · the editorial path

We chained these chapters in the order LA homeowners actually need them. Each one picks up where the last one left a question open.

  1. 02 / 03

    Permitting · 9 min

    San Francisco ADU permitting: the 2026 rulebook

    SF runs the most distinctive ADU process in California — Pre-App meetings, mandatory neighbor notification, and the HCD-compliant pathway. A working playbook.

    Read chapter →

  2. 03 / 03

    Cost · 9 min

    The anatomy of a Bay Area ADU build, line by line

    Where every dollar of a $360,000 detached 800 sq ft Bay Area ADU goes — and why the same unit costs $35K–$60K more than its LA counterpart.

    Read chapter →

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