ADU Pass
Hayward
Alameda County portion
Also in: No County
ADU Pass helps homeowners in Hayward, 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. Hayward operates an AB 2533 Amnesty Program for legalizing pre-existing unpermitted ADUs.
Cost scenarios
| Scenario | Sq ft | Permit | Build | Total |
|---|---|---|---|---|
| minimum | 400 | $4,200 | $220,000 | $224,200 |
| 600 | 600 | $8,500 | $330,000 | $338,500 |
| midpoint | 700 | $10,500 | $385,000 | $395,500 |
| 1000 | 1,000 | $16,000 | $550,000 | $566,000 |
| maximum | 1,200 | $21,500 | $660,000 | $681,500 |
Fee breakdown (as of 2026-04)
Permitting process
- Pre-application planner consult (~5d)
Email planning.division@hayward-ca.gov or call +1-510-583-4216 to confirm site eligibility, zone (RS, RM, RH, etc.), and applicable ADU type (new construction, conversion, AB 2533 amnesty, multifamily SB 1211). - Submit application via e-Permits (~1d)
Submit at hayward-ca.gov/services/permit-center using e-Permits portal. Required: site plan, floor plan, elevations, structural plans, Title 24 energy report. - Plan review fee paid (~3d)
City requires Plan Review Fee paid prior to project review. Other permit fees deferred until issuance. - Plan check (Building, Planning, Fire, Public Works) (~35d)
Concurrent multi-discipline review. Building Division +1-510-583-4140 lead. Typical 1-2 correction cycles. - Permit issuance (~5d)
After corrections cleared, permit fees paid, permit issues. Total ministerial review limit 60 days from complete submittal per state law. - Construction inspections
Foundation, framing, MEP rough-in, insulation, drywall, final. Inspection requests via e-Permits. - Certificate of occupancy (~5d)
Final inspection pass triggers CO; ADU eligible for tenancy.
Viability (permitted uses)
- Long-term rental: yes (HMC Chapter 10 ADU/JADU provisions) 30+ day rental of ADU permitted. Hayward has a Residential Rent Stabilization and Tenant Protection Ordinance (HMC Chapter 12) but newly-constructed ADUs in single-family zones generally exempt under Costa-Hawkins.
- Short-term rental: with-restrictions (Hayward STR rules under Business License Tax + applicable zoning) Hayward does not have a dedicated STR ordinance separate from business-license/TOT framework. Confirm with Planning.
- Business license required
- Transient Occupancy Tax (TOT) collection 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; 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 Hayward homeowners)
- Hayward AB 2533 ADU Amnesty Program — Flat $570 fee (plus state administrative fees) for legalization of pre-existing unpermitted ADUs built before 2020-01-01. Available through 2030.
- SB 13 Impact Fee Waiver (under 750 sqft) — California state law prohibits impact, capacity, or connection fees on ADUs under 750 sqft.
- SB 1211 Multifamily Expansion Pathway — Up to 8 detached ADUs ministerially permitted on lots with existing multifamily dwelling (effective 2025-01-01).
Contacts
Staff: Planning Division (ADU Inquiries) (Planning - ADU/JADU Eligibility) planning.division@hayward-ca.gov, Permits Counter (Permit Center - General)
Utilities
- Water: City of Hayward Water (most parcels) or East Bay MUD (EBMUD - east Hayward parcels) · 25d connect · $4,500
- Sewer: City of Hayward Wastewater (Water Pollution Control Facility on Enterprise Ave) · 21d connect · $4,200
- 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 | $1,750/mo |
| 600 | $2,350/mo |
| 800 | $2,800/mo |
| 1,000 | $3,250/mo |
| 1,200 | $3,675/mo |
Construction timeline
Realistic total: best 8mo · typical 13mo · worst 20mo
Hayward Hills overlay and multiple historic districts (downtown, Mt Eden) may extend timelines. AB 2533 amnesty paths much faster (no construction).
Modular pathway California HCD Factory-Built Housing Program · inspectors are occasional with modular · 6 modular permits (last 24mo)
I-880 / I-238 corridors easy. Hayward Hills cul-de-sacs and Hayward Fault Alquist-Priolo zone constrain module siting.
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 Hayward; Hills parcels often must use California FAIR Plan with elevated base rates.
HOA prevalence & preemption
Hayward has substantial HOA prevalence in Stonebrae, Eden Shores, and newer Mission/Foothill Boulevard subdivisions. State law voids HOA covenants prohibiting ADUs on single-family lots.
Regulatory overlays (5)
- historic-district — Downtown Hayward Historic District; Mt Eden Historic District · +25d · +6% cost
Historic Preservation Review Board reviews ADUs in designated districts. (map) - wui-fire-zone — Hayward Hills (East Hayward above Mission Boulevard ridge / Garin Regional Park area) Local Responsibility Area HFHSZ · +21d · +10% cost
CBC Chapter 7A wildfire-rated assemblies required: Class A roof, ember-resistant vents, defensible space. (map) - seismic-retrofit-zone — Hayward Fault traverses Hayward city center directly (along Mission Boulevard / Foothill); Alquist-Priolo Earthquake Fault Zone restrictions · +30d · +8% cost
Hayward is the namesake city of the Hayward Fault. Seismic Design Category D2 per ASCE 7. Alquist-Priolo zone may exclude habitable structures within 50 ft of fault trace; fault crosses major Hayward neighborhoods. (map) - flood-zone — FEMA SFHA along San Lorenzo Creek, Sulphur Creek, and bay-front zones in West Hayward and toward Russell City Energy Center area · +14d · +7% cost
Finished-floor elevation requirements; flood vents on enclosed below-base areas. (map) - airport-noise-zone — Hayward Executive Airport (KHWD) noise contours over central Hayward residential · +7d · +3% cost
Sound-attenuation construction may be required in noise contours; ALUC review. (map)
Technical envelope (climate & building code)
Climate & energy code
Building code
Amendments:
- Hayward Local Building Code Amendments — Local amendments addressing Hayward Fault Alquist-Priolo setbacks and West Hayward bay-fill seismic requirements.
- CBC Chapter 7A - Wildland-Urban Interface — Required in Hayward Hills HFHSZ - ignition-resistant assemblies.
Contractor market (aggregate)
Legal history (timeline)
Current ordinance: Hayward Municipal Code Chapter 10 - Planning, Zoning and Subdivisions (ADU/JADU provisions), adopted 2020-01-01, last amended 2024-01-01
- 2017-12-19 — Hayward Initial ADU Ordinance Update (city-ordinance)
Hayward's first update to align its second-unit code with the 2017 state ADU bills (SB 1069 / AB 2299).
Effect: Adopted by-right ADU framework, removed parking near transit, reduced lot-size triggers. - 2020-01-01 — Hayward 2020 ADU Code Amendment (city-ordinance)
Conformance amendment for the 2020 state 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, set max sizes per state floor. - 2022-09-13 — Hayward AB 2533 ADU Amnesty Program Adoption (CONS 22-634) (city-ordinance)
City adopted the AB 2533 ADU Amnesty Program enabling owners of pre-existing unpermitted ADUs (built before 2020-01-01) to legalize through a streamlined permit at flat $570 plus state fees.
Effect: Created legalization pathway through 2030 for unpermitted Hayward ADUs, helping convert informal accessory units into legally rentable inventory. - 2024-01-01 — AB 976 (2023) - Permanent owner-occupancy prohibition (state-law)
Permanently bars California cities from imposing owner-occupancy requirements as a condition of ADU permitting.
Effect: Removed Hayward's residual owner-occupancy condition from the ADU categories; JADUs (under 500 sqft) retain a separate state-law owner-occupancy requirement. - 2025-01-01 — SB 1211 (2024) - Multifamily detached ADU expansion (state-law)
Raises ministerial detached-ADU cap from 2 to 8 on lots with existing multifamily; prohibits parking replacement on garage-to-ADU conversions.
Effect: Significantly expands ADU potential on Hayward's 2-4 unit and apartment-zoned parcels, particularly in older Cherryland-adjacent and downtown corridor multifamily.
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
- 94541
- 94542
- 94544
- 94545
Post Office
- 24438 Santa Clara St, 94544
Locale Names
- Hayward Ca Sdc