ADU Pass
Fremont
Alameda County portion
Also in: No County
ADU Pass helps homeowners in Fremont, Alameda County, California navigate the permit paperwork for building an accessory dwelling unit. This area covers 4 ZIP codes.
Map
ADU details
ADU legality: allowed
By-right under ministerial review per state law and FMC 18.190.005. Online intake via Accela Citizen Access at aca-prod.accela.com/cof.
Cost scenarios
| Scenario | Sq ft | Permit | Build | Total |
|---|---|---|---|---|
| minimum | 400 | $3,200 | $232,000 | $235,200 |
| 600 | 600 | $8,500 | $348,000 | $356,500 |
| midpoint | 700 | $10,500 | $406,000 | $416,500 |
| 1000 | 1,000 | $16,500 | $580,000 | $596,500 |
| maximum | 1,200 | $22,000 | $720,000 | $742,000 |
Fee breakdown (as of 2026-04)
Permitting process
- Pre-application research (~5d)
Use Fremont online parcel viewer to confirm zone (R-1, R-2, R-3, etc.), check overlay zones (Hill Area, Niles Historic District, Centerville Historic District), and review FMC 18.190.005 for size/height/setback applicability. - Submit application via Accela Citizen Access (COF) (~1d)
Submit at aca-prod.accela.com/cof with site plan, floor plan, elevations, structural plans, Title 24 energy report. Pre-Approved-Plan applicants flag the preapproved track and receive 7-business-day review (vs 15 for custom). - Initial completeness check + Team Lead assignment (~7d)
City staff route record for review and assign a Team Lead as single point-of-contact. Email notice with Team Lead contact info. - Plan check (zoning, building, fire, MEP, public works) (~35d)
Concurrent multi-discipline review. Pre-approved-plan track skips most plan check. Custom plans go through 1-2 correction cycles typical. - Permit issuance (~5d)
Once corrections cleared and fees paid via Accela. Total ministerial review limit: 60 days from complete submittal per state law. - Construction inspections
Foundation, framing, MEP rough-in, insulation, drywall, final. Inspections requested via Accela. - Certificate of occupancy (~5d)
Final inspection pass triggers CO; ADU eligible for tenancy.
Viability (permitted uses)
- Long-term rental: yes (FMC 18.190.005) 30+ day rental of ADU permitted as residential use. No rent control in Fremont (Costa-Hawkins exempts new construction).
- Short-term rental: with-restrictions (Fremont does not have a dedicated STR ordinance; STRs operate under residential use rules and TOT collection) Verify current STR policy with Planning - rules can change with City Council action.
- Transient Occupancy Tax (TOT) collection required
- Business tax certificate required
- Office rental: no ADU use limited to residential dwelling. Commercial office tenancy not permitted in residentially-zoned ADU.
- Home office: yes Home occupation permit available citywide; signage and customer-traffic limits apply.
- Studio / workshop: yes Personal artist/workshop use is a permitted accessory residential use.
- Agriculture: with-restrictions Limited backyard agriculture allowed by zone; ADU itself remains residential.
- Relative support: yes Family-occupancy ADU explicitly permitted; JADU framework specifically supports owner+relative arrangement.
Incentives
- CalHFA ADU Grant Program — $40,000 one-time (when funded) (Income-qualified Fremont homeowners)
- Fremont Pre-Approved ADU Program — Flat $1,000 plan-review fee, 7-business-day review (vs 15 standard). Multiple pre-approved drawing packages from city-vetted designers.
- SB 13 Impact Fee Waiver (under 750 sqft) — California state law prohibits impact, capacity, or connection fees on ADUs under 750 sqft.
Pre-approved plans Fremont Pre-Approved ADU Program · 6 free designs · 50% plan-review fee waiver · saves ~5 weeks
Contacts
Staff: Zoning Information Line (Planning - Zoning Inquiries), Building & Safety Division (Building Inspection Requests)
Utilities
- Water: Alameda County Water District (ACWD) · 30d connect · $5,500
- Sewer: Union Sanitary District (USD) · 21d connect · $4,800
- Electric: Pacific Gas & Electric (PG&E) · 45d connect · $2,400
- Gas: Pacific Gas & Electric (PG&E) · 45d connect · $1,800
Property values & taxes
Market rent by ADU size
| Sq ft | Rent |
|---|---|
| 400 | $1,985/mo |
| 600 | $2,650/mo |
| 800 | $3,150/mo |
| 1,000 | $3,675/mo |
| 1,200 | $4,150/mo |
Construction timeline
Realistic total: best 7mo · typical 12mo · worst 20mo
Pre-approved-plan track shaves typical timeline. Hill Area overlay (above 12% slope on east-side hills toward Mission Peak) adds geotech and design review, extending worst case.
Modular pathway California HCD Factory-Built Housing Program · inspectors are experienced with modular · 18 modular permits (last 24mo)
I-880 and I-680 corridors easy for modules; Hill Area cul-de-sacs limit module width on slope parcels.
Financing
State ADU loans:
- CalHFA ADU Grant Program (California Housing Finance Agency) up to $40,000
- HCD ADU Funding Resources Index (California Department of Housing and Community Development)
Insurance impact
California carrier pullback affects Fremont; Hill Area parcels often must use California FAIR Plan with higher base rates. Premium delta higher in fire zones ($1000-1400).
HOA prevalence & preemption
Fremont has substantial HOA prevalence in Warm Springs, Ardenwood, Mission, and Niles townhouse / planned-development subdivisions. State law voids HOA covenants prohibiting ADUs on single-family lots; HOAs retain authority over reasonable design standards.
Regulatory overlays (5)
- historic-district — Niles Historic District, Centerville Historic District, Mission San Jose Historic District · +25d · +6% cost
Historic district review (Historic Architectural Review Board) for ADUs in designated districts. (map) - wui-fire-zone — Mission Peak / east-side hills Local Responsibility Area High Fire Hazard Severity Zone · +21d · +10% cost
CBC Chapter 7A wildfire-rated assemblies required in HFHSZ - Class A roof, ember-resistant vents, defensible space. (map) - seismic-retrofit-zone — Hayward Fault / Mission Peak Fault traverses Fremont (Centerville to Mission San Jose); Alquist-Priolo Earthquake Fault Zone restrictions · +30d · +8% cost
Seismic Design Category D2 per ASCE 7. Alquist-Priolo zone may exclude habitable structures within 50 ft of fault trace. (map) - flood-zone — FEMA SFHA along Alameda Creek, Coyote Creek, and bay-front Mowry Slough / Newark border zones · +14d · +7% cost
Finished-floor elevation requirements; flood vents on enclosed below-base areas. (map) - other — Hill Area Initiative overlay - parcels above 12% slope east of Mission Boulevard · +30d · +15% cost
Voter-passed Hill Area Initiative restricts development on slopes; geotech, slope analysis, and ridgeline-protection findings required. (map)
Technical envelope (climate & building code)
Climate & energy code
Building code
Amendments:
- Fremont Local Building Code Amendments — Local amendments addressing Hayward/Mission Peak Fault setbacks, Hill Area Initiative requirements.
- CBC Chapter 7A - Wildland-Urban Interface — Required in Mission Peak / east-hills HFHSZ - ignition-resistant assemblies.
Contractor market (aggregate)
Legal history (timeline)
Current ordinance: Fremont Municipal Code Chapter 18.190 - Special Provisions Applying to Miscellaneous Uses (Section 18.190.005 Accessory Dwelling Units), adopted 2023-07-11, last amended 2025-02-05
- 2017-12-12 — Fremont Zoning Text Amendment PLN2016-00239 - ADU Ordinance (city-ordinance)
First overhaul of Fremont's accessory-unit code aligning Title 18 with the 2017 state ADU bills (SB 1069 / AB 2299).
Effect: Replaced second-unit framework with by-right ADUs, removed parking near transit, reduced minimum lot-size triggers. - 2020-10-06 — Fremont 2020 ADU Ordinance Update (city-ordinance)
Conformance amendment for the 2020 ADU statute changes (AB 68, AB 881, SB 13, AB 670, AB 587).
Effect: Adopted 60-day ministerial review, removed owner-occupancy on most categories, added impact-fee exemption under 750 sqft, recognized JADU framework. - 2023-07-11 — Fremont 2023 ADU Ordinance Update (effective 2023-08-11) (city-ordinance)
Updates Title 18 and FMC 18.190.005 for SB 897 / AB 2221 (height standardization, JADU clarifications) and AB 976 (permanent owner-occupancy ban).
Effect: Detached ADUs to 1,200 sqft cap, attached to 1,000 sqft. Height 16 ft detached / 18 ft if matching primary. Permanent removal of owner-occupancy condition for ADUs (JADUs still subject to state-law owner-occupancy). - 2025-01-07 — Fremont 2025 Title 18 Amendments (effective 2025-02-05) (city-ordinance)
Cleanup amendments to Title 18 covering ADU front-setback exceptions, parking near transit definitions, and pre-approved-plan-program language.
Effect: Tightened compliance with HCD comment letters, integrated AB 1332 pre-approved-plan framework into local code.
Alameda County — county ADU rules and overlays
County ADU ordinance
California state — ADU law and programs
State ADU law
California has the most aggressive statewide ADU preemption regime in the US, built from ~15 bills passed 2019-2025 and enforced by the Department of Housing and Community Development (HCD). The 2026 HCD ADU Handbook addendum (in effect with the 2025 Title 24 code cycle) is the operative state-level reference. The regime does four things at once: (1) preempts local zoning that would ban or unreasonably restrict ADUs; (2) imposes by-right ministerial approval with short statutory deadlines; (3) caps fees and utility-connection charges; and (4) empowers HCD to void non-compliant local ordinances.
State HOA preemption
California has the strongest statewide HOA-preemption regime in the US for accessory dwelling units, built from two bills: AB 670 (2019) voided ADU-prohibiting covenants on single-family residential lots, and AB 3182 (2020) extended and codified the preemption into the Davis-Stirling Common Interest Development Act (Civil Code §§ 4740 / 4741). The combination prohibits common-interest communities from banning ADUs, restricting rentals below 25% of separate interests, or treating ADUs as separate HOA interests. Limits remain: HOAs retain authority over reasonable design standards and statutory height limits, and the 2026 Carlsbad case (CalMatters coverage) established that an HOA's documented design-standards regime can effectively delay or constrain ADU approval short of outright prohibition.
State financing programs
California's flagship state-level ADU financing program — the CalHFA ADU Grant Program — is paused and has not been refunded since the original $100 million allocation was fully deployed 2023-12-28. The program provided up to $40,000 per qualifying homeowner for pre-construction and non-recurring closing costs and financed approximately 2,500 ADUs in two rounds. As of 2026-04, no new funding round has been announced in the state budget. CalHFA continues to publish anti-scam warnings because bad actors actively solicit homeowners claiming access to grant funds that no longer exist. State-level financing activity has shifted to local pilot programs (San Francisco, San Jose, Los Angeles, San Diego) and private financing products (Fannie Mae ADU mortgage, HELOC, construction-to-permanent).
State housing programs
California's state-level ADU programs are concentrated at HCD (technical guidance, ordinance review, enforcement) and the paused CalHFA grant pipeline (covered under stateFinancing). The state does not operate a central pre-approved ADU plan library — instead, AB 1332 (2024) created a preemption framework for local pre-approved plans with a 30-day ministerial-approval deadline, and major cities (Los Angeles, San Diego, San Jose, Sacramento, Berkeley) have rolled out their own plan catalogs. The California YIMBY coalition and other housing-policy organizations play an influential role in bill drafting; they are not state agencies but effectively drive much of the ADU legislative agenda. The Title 24 code cycle (now 2025, in effect for 2026 permits) is the authoritative building-code baseline.
Federal (United States) — ADU-relevant rules and programs
Federal ADU law
The United States has no federal statute that directly regulates accessory dwelling unit entitlement or design. Land-use authority over ADUs resides with states and local governments under the traditional police power. Federal engagement is limited to financing (Fannie/Freddie/FHA/VA/USDA), flood insurance (FEMA/NFIP), and discretionary housing programs (HUD), which are recorded in sibling sections of this file.
Federal financing programs
Federal housing-finance agencies and GSEs set nationwide underwriting rules that govern whether an ADU can be financed, appraised, and counted toward mortgage qualifying income. The relevant actors are Fannie Mae, Freddie Mac, FHA (HUD), VA, and USDA Rural Development.
Federal tax credits
There is no ADU-specific federal tax credit. ADUs may incidentally qualify for existing federal energy-efficiency and clean-energy tax credits when the ADU construction includes qualifying measures.
Federal housing programs
HUD administers several discretionary programs that can fund ADU-related activity at the grantee's election, but none is an ADU-specific program.
ZIP Codes
- 94536
- 94538
- 94539
- 94555
Post Office
- 160 J St, 94536
- 240 Francisco Ln, 94539
- 37010 Dusterberry Way, 94536
- 41041 Trimboli Way, 94538
- 4260 Business Center Dr, 94538
- 43456 Ellsworth St, 94539