San Francisco ADU Permit & Zoning Checklist

Housing and Building Standards California 4 Minutes Read ยท published February 06, 2026 Flag of California

In San Francisco, California property owners planning an accessory dwelling unit (ADU) must follow both zoning rules and building permit procedures set by city agencies. This guide explains the typical permit checklist, zoning steps, enforcement pathways, and the offices responsible for approvals and inspections. Begin with the Planning Department's ADU overview to confirm site eligibility and objective standards San Francisco Planning - ADUs[1], then prepare plans for the Department of Building Inspection (DBI) permit process San Francisco DBI - ADU permits[2]. Refer to the official municipal code for controlling zoning provisions and definitions San Francisco Municipal Code - Code Library[3].

Preparing your ADU permit application

Before submitting, confirm zoning compliance, prepare construction drawings, and collect site documentation. Typical items officials expect are listed below. Exact submittal requirements and fees are set by Planning and DBI and may change; always check the linked official pages.

  • Site plan showing lot lines, existing structures, proposed ADU location and setbacks.
  • Architectural floor plans, elevations, and sections signed by the designer or licensed professional if required.
  • Zoning confirmation: lot coverage, height limits, rear yard and side yard requirements.
  • Fee payment and completed application forms as listed by DBI and Planning.
  • Compliance documents for plumbing, electrical, and structural scope; energy and accessibility notes when applicable.
  • Historic review or neighborhood notification if the property is in a historic district or special zoning area.
Start with a pre-application review from Planning or DBI to find likely zoning or code conflicts early.

Site and zoning checks

Confirm the property zoning district and any applicable special use or overlay districts. San Francisco's Planning Department provides district regulations and objective standards; where objective standards apply, some ADU features may be reviewed ministerially and cannot be conditionally denied if they meet code.[1]

  • Verify zoning district and frontage/setback rules against the Municipal Code and Planning maps.
  • Check for historic designation, conservation districts, or special planning area rules that may require additional review.
  • Contact Planning early for clarification on objective standards and allowable unit sizes.

Permits, review and inspections

ADU projects commonly need both Planning clearances (zoning review, conditional use if applicable) and DBI building permits. The DBI permit review will include building, electrical, plumbing, mechanical, and energy compliance. Inspections occur during construction per DBI schedules.

  • Submit complete plans and application to DBI; incomplete submissions cause delays.
  • Obtain any required Planning sign-offs before permit issuance.
  • Schedule inspections through DBI once work begins and before final occupancy.
Inspections must be requested in the order required by DBI to receive final approval.

Penalties & Enforcement

Unpermitted ADU construction or violations of zoning and building codes can trigger enforcement by the Department of Building Inspection and related enforcement units. Remedies commonly include stop-work orders, civil penalties, orders to correct, and potential civil or criminal prosecution for serious violations. Enforcement procedures and penalties are documented in the Municipal Code and DBI enforcement policies.

  • Fine amounts: not specified on the cited pages; check DBI enforcement notices and the Municipal Code for fee schedules and penalty tables.[2]
  • Escalation: first, repeat, and continuing offence treatment is governed by DBI enforcement rules and the Municipal Code; specific ranges are not specified on the cited pages.[2]
  • Non-monetary sanctions: stop-work orders, correction notices, orders to obtain permits, demolition or removal orders, and civil injunctive actions.
  • Enforcer: Department of Building Inspection (DBI) enforces building permits and unsafe work; Planning enforces zoning and land-use conditions. Contact links are in Resources below.
  • Inspection and complaint pathways: report unsafe or unpermitted work to DBI via their online complaint form on the DBI site.
  • Appeals/review: appeal routes and time limits are set by DBI and the Municipal Code; specific appeal deadlines are not specified on the cited pages and should be confirmed with DBI or by consulting the Municipal Code.[3]
  • Defences/discretion: permits, variances, or after-the-fact approvals may mitigate penalties if granted; discretion is exercised per code provisions and administrative rules.

Applications & Forms

DBI and Planning list required application packets and checklists on their official sites. Some common submittals include a DBI building permit application, construction drawings, and a Planning ADU application or zoning clearance. Specific form names, numbers, fees, and submission portals are posted on the agency pages linked above; if a form number or a fee table is not shown on the linked page, it is not specified on the cited page.[2]

FAQ

Do I need a permit to build an ADU in San Francisco?
Yes. Most ADUs require Planning zoning review and a DBI building permit; confirm requirements on the Planning and DBI ADU pages.[1]
How long does the permit process take?
Timelines vary by project complexity and completeness; specific average processing times are not specified on the cited pages, so contact DBI or Planning for current estimates.[2]
What if I built an ADU without a permit?
Unpermitted work may result in stop-work orders, civil penalties, and orders to obtain permits or remove noncompliant work; consult DBI enforcement guidance and the Municipal Code for procedures.[2]

How-To

  1. Confirm zoning eligibility: check the Planning ADU page and municipal zoning maps to verify your lot allows an ADU.[1]
  2. Prepare plans and documentation: collect site plans, floor plans, and scope of work to meet DBI and Planning checklists.
  3. Submit applications: file required forms and plans with DBI (building permit) and obtain any Planning clearances; pay applicable fees.
  4. Complete inspections: schedule and pass inspections during construction and request final approval for occupancy.
  5. Closeout: obtain final sign-offs from DBI and Planning and retain copies of permits and approvals.

Key Takeaways

  • Start with Planning and DBI early to confirm zoning and permit requirements.
  • Complete application packages reduce review delays.
  • Unpermitted ADUs can trigger enforcement; resolve with permits or remediation promptly.

Help and Support / Resources

  1. [1] City of San Francisco Planning Department - Accessory Dwelling Units
  2. [2] San Francisco Department of Building Inspection - ADU permits and enforcement
  3. [3] San Francisco Municipal Code - Code Library (zoning and building provisions)

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