San Francisco ADU Programs and Grants: What Homeowners Need to Know

San Francisco has three distinct ADU permit pathways, one paused statewide grant program, automatic impact fee savings that apply to most projects, and a city loan program for eligible low-income homeowners. This guide explains what each program actually covers, who qualifies, how to apply, and what constraints apply — including which programs are currently active and which are not.

Note: Program availability, income limits, and eligibility requirements change. This guide reflects information available as of June 2026. Verify current program status directly with the relevant agency before making decisions. This article does not constitute legal, zoning, or financial advice.

Quick Summary

San Francisco homeowners can access automatic impact fee exemptions (no application required), an MOHCD rehabilitation loan at 3% interest, and San Francisco Planning's streamlined State Program pathway. The CalHFA ADU Grant ($40,000 for pre-construction costs) is currently paused with no confirmed restart. There is no active program called the "ADU Bonus Program" in San Francisco — but the city's permit pathways and incentives do offer real financial value.

Why San Francisco Homeowners Are Building ADUs

San Francisco has some of the highest rental demand in California. A one-bedroom ADU in a desirable SF neighborhood can rent for well above statewide averages — numbers that make the math pencil out for homeowners willing to absorb higher construction costs.

The most common reasons SF homeowners build ADUs:

Rental income to offset mortgage or property tax payments
Housing for aging parents or adult children
Long-term property value increase (ADUs add assessed value upon completion)
Use of underutilized garage, basement, or backyard space

San Francisco construction costs run higher than most California cities. Labor, materials, and permit fees are all elevated. This makes it more important to understand which programs can reduce upfront costs — and which are currently available.

San Francisco's Three ADU Permit Pathways

San Francisco Planning offers three permit routes for ADUs. The pathway you choose affects review speed, rent control exposure, and long-term rental income flexibility. This is often the most consequential decision an SF homeowner makes before breaking ground.

State Program (recommended for most homeowners)

California's ADU mandate requires San Francisco to approve ADU applications ministerially — meaning no discretionary design review, no California Environmental Quality Act (CEQA) review, no neighborhood notification, and no appeals (for applications submitted after January 1, 2024). Permits are reviewed on objective standards only.

State Program ADUs are generally not subject to San Francisco's rent control ordinance under state law. This is a significant long-term distinction — it means you retain more flexibility to adjust rent between tenancies.

Eligible ADU types: converted (within existing space), attached, detached, and Junior ADUs (JADUs) up to 500 sq ft. Studio and one-bedroom ADUs are allowed up to 850 sq ft or 50% of the existing primary dwelling, whichever is greater.

Local Program

San Francisco's Local Program offers waivers from certain Planning Code requirements — things like density limits, rear yard standards, and open space requirements — that might otherwise block an ADU. This can make difficult projects feasible that wouldn't qualify under the State Program.

The tradeoffs are significant:

Local Program ADUs are subject to San Francisco rent control
A Costa-Hawkins Regulatory Agreement is required when waivers are granted
Planning review takes up to 60 days
You must post a notice in your building at least 15 days before submitting the ADU application
The program is unavailable if there has been an owner move-in eviction at the property within the past 5 years, or any other no-fault eviction within the past 10 years

The eviction history restriction is meaningful in San Francisco's tenant-protective environment. Verify your property's history before assuming you qualify.

State Hybrid Program

Available for multi-family residential buildings. Combines the state-level ministerial review flexibility with San Francisco's local density allowances for attached, detached, and converted ADUs. Most relevant for owners of apartment buildings looking to add units.

What Is San Francisco's "ADU Bonus Program"?

There is no program in San Francisco called the "ADU Bonus Program" by that exact name. The term comes up in a few different contexts — it's worth clarifying each one.

California's State Density Bonus Law allows residential projects that include affordable units to receive additional density and height beyond normal zoning limits. ADUs built ministerially can count toward the five-unit minimum threshold that activates this bonus. However, this program is primarily relevant for multi-unit residential developers — not individual homeowners adding a single ADU to a single-family property.

San Francisco's Affordable Housing Bonus Program (AHBP) is a separate city-level program that offers additional density and height to developers who include at least 12% on-site affordable housing units. The program is designed for larger projects and is not available to individual homeowners adding an ADU to an existing home. The 100% Affordable version of this program was repealed by Ordinance 245-25, effective January 12, 2026.

Some ADU contractors and marketing websites use "ADU bonus program" informally to refer to the CalHFA ADU Grant (the $40,000 statewide grant program). That program is described in detail in the next section.

Financial Programs and Incentives for SF Homeowners

ACTIVEImpact Fee Exemption (CA Gov. Code §66329)

This is the most accessible financial benefit available to San Francisco ADU homeowners — and it requires no application.

Under California Government Code Section 66329, ADUs under 750 square feet are fully exempt from local development impact fees. ADUs 750 sq ft or larger are charged proportionally by size, not at the full single-family rate.

In San Francisco, where development impact fees for new residential units can run into the tens of thousands of dollars, this exemption provides meaningful savings on smaller ADU projects. It applies automatically during permitting — no income limits, no separate application, no deadline.

PAUSEDCalHFA ADU Grant Program ($40,000)

The California Housing Finance Agency (CalHFA) ran a grant program that provided up to $40,000 to eligible homeowners for pre-construction ADU costs. The program funded:

Architectural plans and design fees
Permit fees and processing costs
Site preparation
Soil tests and property surveys
Energy reports
Impact fees (on ADUs over 750 sq ft)
Utility hookup costs

The grant did not cover construction labor or materials, foundation work, framing, drywall, or finishes.

Current status: The CalHFA ADU Grant Program is paused as of 2026. CalHFA exhausted its grant funding and stopped accepting applications. No confirmed restart date has been announced. Housing advocates are pushing for a new funding round. Monitor calhfa.ca.gov/adu for updates.

San Francisco eligibility (when program was active):

Must own and occupy the property as a primary residence
Income at or below 80% of Area Median Income (AMI) for San Francisco County — approximately $126,560 in 2023; current limits would be higher
Property must be a single-family home or 2-4 unit multifamily
Only one grant per household, per lifetime
Must apply through a CalHFA-approved lender
Applications processed alongside ADU construction financing

When the program reopens (if it does), applications will be first-come, first-served. Homeowners in planning stages should identify a CalHFA-approved lender in advance.

ACTIVEMOHCD CalHome Loan Program

San Francisco's Mayor's Office of Housing and Community Development (MOHCD) administers the CalHome Loan Program for property rehabilitation, including for owners of 1-4 unit residential properties. While not ADU-specific, eligible homeowners may be able to use CalHome funds for structural or utility work connected to an ADU project.

Owner-occupants of 1-4 unit properties
Income at or below HUD Low-Income limits (adjusted for household size)
3% simple interest, 30-year term
Loan is due at sale, title transfer, or when owner no longer occupies
Scope is limited to the owner's unit and common areas

Contact MOHCD directly at (415) 701-5500 or sfhousinginfo@sfgov.org to confirm whether your project qualifies and whether funds are currently available.

Eligibility at a Glance

Program	Status	Who Qualifies	Amount / Benefit
Impact Fee Exemption	Active	All ADU projects under 750 sq ft; no income limits	Full exemption from development impact fees
CalHFA ADU Grant	Paused	Owner-occupants at or below 80% AMI (~$126,560 in SF, 2023 figures)	Up to $40,000 for pre-construction costs
MOHCD CalHome Loan	Active	Owner-occupants of 1-4 unit properties at HUD Low-Income	Deferred rehab loan at 3% for 30 years
SF AHBP (Affordable Housing Bonus Program)	Not for individuals	Developers with 12%+ affordable units (100% version repealed Jan 2026)	Bonus density and height allowances

Note: Program availability, income limits, and eligibility criteria change. Confirm current status directly with CalHFA (calhfa.ca.gov), MOHCD (sfmohcd.org), or SF Planning (sfplanning.org) before making project decisions.

How to Apply: ADU Permit and Grant Processes

For the ADU Permit (SF Planning and DBI)

1
Determine your property type and which program fits — State, Local, or State Hybrid. For most single-family homeowners, the State Program is the starting point.
2
For the Local Program: post a notice in your building at least 15 days before submitting your application. Confirm your property has no disqualifying eviction history (no owner move-in eviction within 5 years; no other no-fault eviction within 10 years).
3
Prepare construction documents. For State Program ADUs, SF offers a Permit Review Roundtable — a virtual multi-department review session that lets you get feedback from Planning, DBI, the Public Utilities Commission, and the Fire Department simultaneously.
4
Submit your building permit application at the Department of Building Inspection (DBI). Planning review runs concurrently.
5
Respond to any requests for clarification or plan revisions. State Program review is ministerial (objective standards only, no subjective design decisions).
6
Once permits are issued, begin construction with required inspections at each phase.
7
Final inspections and sign-off. Your ADU is recorded with the assessor's office at completion.

For the CalHFA ADU Grant (when the program reopens)

1
Find a CalHFA-approved lender. The grant does not come directly from CalHFA — it is processed through approved lenders alongside your ADU construction financing. CalHFA publishes the current approved lender list at calhfa.ca.gov.
2
Apply for ADU construction financing with the lender. The grant application is submitted at the same time as your loan application, not separately.
3
Provide income documentation, proof of ownership, utility bills, and project scope information.
4
The lender processes your grant application. Applications are first-come, first-served once funding opens.
5
If approved, the $40,000 grant is applied to pre-construction costs — not directly disbursed to you, but credited toward eligible expenses.

Timeline Constraints to Know

Phase	Estimated Time	Notes
Local Program notice period	15+ days	Required before submitting application
Planning review (Local Program)	Up to 60 days	Subjective review by Planning department
Planning review (State Program)	Streamlined	Ministerial, no CEQA, no appeals post Jan 2024
Total permitting (planning + DBI)	3–9 months	Varies by project complexity and revision rounds
Construction	4–12+ months	Converted ADUs faster; detached ADUs longer
CalHFA grant restart	Unknown	No confirmed date; monitor calhfa.ca.gov

Other constraints that affect timing:

Local Program is unavailable if there was an owner move-in eviction at the property within the past 5 years, or any no-fault eviction within the past 10 years
JADUs with shared bathrooms require owner-occupancy in either the main unit or the JADU — which affects your ability to vacate the primary residence
ADUs cannot be rented on short-term platforms in San Francisco at any time — this is not a temporary restriction
Separately selling a State Program detached ADU (condo conversion) requires the property to have 4 or fewer total units and an application submitted after May 1, 2025

Homeowner Checklist Before You Start

✓
Determined which permit pathway fits your property (State vs. Local vs. State Hybrid)
✓
Checked your property's eviction history if considering the Local Program
✓
Confirmed your ADU is under 750 sq ft to qualify for automatic impact fee exemption
✓
Checked CalHFA's website for current grant program status
✓
Contacted MOHCD to ask about CalHome Loan availability if income-eligible
✓
Identified a CalHFA-approved lender in case the grant reopens during your project
✓
Confirmed ADU short-term rental is not part of your income plan
✓
Reviewed whether the State Program's rent control exemption affects your decision between pathways

ADU Cost Guide: What Projects Actually Cost →ADU Permit Guide: How the Process Works →Detached ADU Guide: Costs, Permits, and What to Know →Garage Conversion ADU: A Complete Guide →How to Find a Qualified ADU Contractor →Get Matched With ADU Builders →

Frequently Asked Questions

Is the CalHFA ADU Grant available in San Francisco right now?

No. The CalHFA ADU Grant Program exhausted its funding and has been paused since late 2023. As of 2026, CalHFA is not accepting new applications and has not announced a restart date. Homeowners should monitor calhfa.ca.gov directly for updates. The grant was $40,000 toward pre-construction costs — not construction itself.

Which San Francisco ADU permit pathway is better for individual homeowners?

For most individual homeowners, the State Program is the stronger choice. It offers streamlined ministerial review, no neighborhood notification requirements, exemption from CEQA environmental review, and no appeals. State Program ADUs are also generally not subject to San Francisco's rent control ordinance, which significantly affects long-term rental income flexibility.

What types of ADU projects qualify for the impact fee exemption?

Under California Government Code Section 66329, ADUs under 750 square feet are fully exempt from local development impact fees. ADUs 750 square feet or larger are charged fees proportionally to size, not at the full single-family rate. This exemption applies automatically at permitting and requires no separate application or income qualification.

Can I rent my San Francisco ADU on Airbnb or Vrbo?

No. San Francisco prohibits ADUs from being used as short-term rentals. ADUs must be rented on long-term leases. This applies regardless of which permit pathway you used. Short-term rental of an ADU violates city law and can result in enforcement action.

Does San Francisco's Affordable Housing Bonus Program apply to individual homeowners adding a single ADU?

Generally no. San Francisco's Affordable Housing Bonus Program targets projects with at least 12% on-site affordable units — a threshold reached only by larger multi-unit residential developers. The 100% Affordable version of this program was repealed effective January 12, 2026. Individual homeowners adding a single ADU are not the intended participants.

How long does the ADU permit process take in San Francisco?

Under the State Program, planning review is ministerial and streamlined — no subjective design review, no CEQA, no neighborhood notification, and no appeals (for applications filed after January 1, 2024). Total permitting time, including DBI building permit review, typically ranges from 3 to 9 months. Construction adds another 4 to 12 months or more depending on ADU type and complexity.

Disclaimer: This article is for informational purposes only and does not constitute legal, zoning, permitting, financial, or tax advice. Program availability, income limits, and eligibility requirements change. Requirements vary by property type, zoning, and project scope. Confirm current program status with CalHFA, MOHCD, and SF Planning before making decisions about your ADU project.

Sources

San Francisco Planning Department — ADU programs and permit pathways: sfplanning.org/accessory-dwelling-units
City and County of San Francisco — ADU topic overview: sf.gov/topics--accessory-dwelling-unit-adu
California Housing Finance Agency — ADU Grant Program: calhfa.ca.gov/adu
San Francisco Mayor's Office of Housing and Community Development — Property rehabilitation resources: sfmohcd.org/property-rehabilitation-resources
SF Planning — Affordable Housing Bonus Program: sfplanning.org/ahbp
California Government Code Section 66329 — ADU impact fee exemptions: leginfo.legislature.ca.gov

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