statewide.json

[
  {
    "rule_id": "adu-ministerial-review",
    "pathway": "ADU — ministerial review and application timelines",
    "display_group": "route",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-66317",
      "hcd-adu-handbook-2026-03"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "adu"},
      {
        "field": "primary_dwelling_status",
        "op": "in",
        "value": [
          "existing_single_family",
          "existing_multifamily",
          "proposed_single_family",
          "proposed_multifamily"
        ]
      }
    ],
    "citation": {
      "source": "Gov. Code § 66317",
      "url": "https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV&sectionNum=66317",
      "excerpt": "A permit application for an accessory dwelling unit shall be considered and approved ministerially without discretionary review or a hearing. [...] A permitting agency shall determine whether an application [...] is complete and provide written notice [...] not later than 15 business days after the permitting agency received the application. [...] The permitting agency shall either approve or deny [...] within 60 days from the date the permitting agency receives a completed application if there is an existing single-family or multifamily dwelling on the lot.",
      "verified_on": "2026-07-27"
    },
    "required_documents": [
      "site plan",
      "floor plan",
      "jurisdiction ADU application form"
    ],
    "notes": "Ministerial review and the 15-business-day written completeness determination apply to ADU applications. The 60-calendar-day approval-or-denial period applies after receipt of a completed application when an existing single-family or multifamily dwelling is on the lot. When the ADU application accompanies a proposed primary dwelling, the agency may delay the ADU decision until it decides the primary-dwelling application. Applicant-requested delay tolls the 60-day period. An incomplete or denied application must receive written defects or missing items and a description of how to remedy them; § 66317(d) also requires an appeal process."
  },
  {
    "rule_id": "adu-protected-minimum",
    "pathway": "ADU — protected 800-square-foot option",
    "display_group": "standard",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-66321",
      "hcd-adu-handbook-2026-03"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "adu"},
      {
        "field": "primary_dwelling_status",
        "op": "in",
        "value": [
          "existing_single_family",
          "existing_multifamily",
          "proposed_single_family",
          "proposed_multifamily"
        ]
      }
    ],
    "citation": {
      "source": "Gov. Code § 66321(b)(3)",
      "url": "https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV&sectionNum=66321",
      "excerpt": "A local agency shall not establish by ordinance [...] any [...] limits on lot coverage, floor area ratio, open space, front setbacks, and minimum lot size [...] that does not permit an accessory dwelling unit with at least 800 square feet of interior livable space and with four-foot side and rear yard setbacks to be constructed in compliance with all other local development standards.",
      "verified_on": "2026-07-27"
    },
    "required_documents": [],
    "notes": "This is a protected option, not a required minimum unit size. An applicant may propose a smaller ADU. Local lot-coverage, floor-area-ratio, open-space, front-setback, and minimum-lot-size rules cannot eliminate the ability to build an ADU of at least 800 square feet with four-foot side and rear setbacks when every other applicable local development standard is met."
  },
  {
    "rule_id": "adu-height-standards",
    "pathway": "ADU — state-protected height options",
    "display_group": "standard",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-66321",
      "hcd-adu-handbook-2026-03"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "adu"},
      {
        "field": "primary_dwelling_status",
        "op": "in",
        "value": [
          "existing_single_family",
          "existing_multifamily",
          "proposed_single_family",
          "proposed_multifamily"
        ]
      }
    ],
    "citation": {
      "source": "Gov. Code § 66321(b)(4)",
      "url": "https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV&sectionNum=66321",
      "excerpt": "Any height limitation [must] allow at least [...] 16 feet for a detached accessory dwelling unit [...]; 18 feet for a detached accessory dwelling unit [...] within one-half of one mile walking distance of a major transit stop or a high-quality transit corridor. A local agency shall also allow an additional two feet in height to accommodate a roof pitch [...] aligned with the roof pitch of the primary dwelling unit. [...] 18 feet for a detached accessory dwelling unit on a lot with an existing or proposed multifamily, multistory dwelling. [...] 25 feet or the height limitation [...] that applies to the primary dwelling, whichever is lower, for an accessory dwelling unit that is attached to a primary dwelling.",
      "verified_on": "2026-07-27"
    },
    "required_documents": [],
    "notes": "Detached ADUs have a 16-foot base protection. A detached ADU within one-half mile walking distance of a qualifying major transit stop or high-quality transit corridor must be allowed 18 feet; in that transit branch, an aligned primary-dwelling roof pitch can add two feet. A detached ADU on a lot with an existing or proposed multistory multifamily dwelling must be allowed 18 feet, but that branch alone does not carry the separate two-foot roof-pitch addition. An attached ADU must be allowed 25 feet or the primary dwelling's zoning height limit, whichever is lower, without requiring more than two stories."
  },
  {
    "rule_id": "jadu-standards",
    "pathway": "JADU — required location, features, and recorded restrictions",
    "display_group": "standard",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-66313",
      "ca-gov-66333",
      "hcd-adu-handbook-2026-03"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "jadu"},
      {
        "field": "primary_dwelling_status",
        "op": "in",
        "value": [
          "existing_single_family",
          "proposed_single_family"
        ]
      }
    ],
    "citation": {
      "source": "Gov. Code §§ 66313(d), 66333",
      "url": "https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV&sectionNum=66333",
      "excerpt": "A [JADU] ordinance [...] shall [...] require the recordation of a deed restriction [...]; require a permitted junior accessory dwelling unit to be constructed within the walls of the proposed or existing single-family residence; require [...] a separate entrance from the main entrance [...]; require [...] an efficiency kitchen [...]; [and] require that a rental of a junior accessory dwelling unit be for a term longer than 30 days.",
      "verified_on": "2026-07-27"
    },
    "required_documents": [
      "floor plan showing the JADU within the single-family residence",
      "jurisdiction JADU application form",
      "deed restriction in the form required by the jurisdiction"
    ],
    "notes": "A JADU is no more than 500 square feet of interior livable space and must be entirely within a proposed or existing single-family residence. It requires a separate entrance and an efficiency kitchen. A recorded deed restriction must prohibit separate sale and bind the JADU's size and attributes. Shared sanitation facilities require owner occupancy unless the statutory governmental-agency, land-trust, or housing-organization exception applies; separate sanitation facilities do not. A JADU rental must be longer than 30 days."
  },
  {
    "rule_id": "jadu-ministerial-review",
    "pathway": "JADU — ministerial review and application timelines",
    "display_group": "route",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-66335",
      "hcd-adu-handbook-2026-03"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "jadu"},
      {
        "field": "primary_dwelling_status",
        "op": "in",
        "value": [
          "existing_single_family",
          "proposed_single_family"
        ]
      }
    ],
    "citation": {
      "source": "Gov. Code § 66335",
      "url": "https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV&sectionNum=66335",
      "excerpt": "An application for a permit pursuant to this article shall [...] be considered ministerially, without discretionary review or a hearing. [...] A permitting agency shall determine whether an application [...] is complete and provide written notice [...] not later than 15 business days after the permitting agency received the application. [...] The permitting agency shall either approve or deny [...] within 60 days from the date the local agency receives a completed application if there is an existing single-family dwelling on the lot.",
      "verified_on": "2026-07-28"
    },
    "required_documents": [
      "jurisdiction JADU application form"
    ],
    "notes": "Ministerial review and the 15-business-day written completeness determination apply to JADU applications. The 60-calendar-day approval-or-denial period applies after receipt of a completed application when an existing single-family dwelling is on the lot. When the JADU application accompanies a proposed single-family dwelling, the agency may delay the JADU decision until it decides the primary-dwelling application. Applicant-requested delay tolls the 60-day period. Incomplete or denied applications must receive written defects or missing items and remedies; § 66335(e) also requires an appeal process."
  },
  {
    "rule_id": "sb9-two-unit-ministerial",
    "pathway": "SB 9 — possible two-unit housing route",
    "display_group": "route",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-65852-21",
      "hcd-sb9-fact-sheet-2026-04"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "two_unit"},
      {"field": "sf_zone", "op": "eq", "value": "yes"},
      {"field": "in_urbanized_area", "op": "eq", "value": "yes"},
      {"field": "demolishes_protected_housing", "op": "eq", "value": "no"},
      {"field": "tenant_occupied_last_3_years", "op": "eq", "value": "no"},
      {"field": "ellis_withdrawal_last_15_years", "op": "eq", "value": "no"},
      {"field": "two_unit_contributing_historic_location", "op": "eq", "value": "no"},
      {"field": "two_unit_individually_listed_historic_property", "op": "eq", "value": "no"},
      {"field": "on_protected_site", "op": "eq", "value": "no"}
    ],
    "citation": {
      "source": "Gov. Code § 65852.21",
      "url": "https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV&sectionNum=65852.21",
      "excerpt": "A proposed housing development containing no more than two residential units within a single-family residential zone shall be considered ministerially [...] if [the parcel meets the listed urbanized-area, protected-site, protected-housing, Ellis Act, and historic-resource requirements]. [...] [Standards shall not] physically preclude the construction of up to two units or [...] either of the two units from being at least 800 square feet in floor area.",
      "verified_on": "2026-07-27"
    },
    "required_documents": [
      "site plan",
      "floor plans for proposed units",
      "jurisdiction SB 9 application form"
    ],
    "notes": "This route requires explicit confirmation of every encoded condition: single-family residential zoning; qualifying urbanized location; no protected-site exclusion; no demolition or alteration of affordable-restricted, rent- or price-controlled, or recently tenant-occupied housing; no Ellis Act withdrawal within 15 years; no contributing structure in a historic district or property within a historic district designated by local ordinance; and no individually listed historic parcel or locally designated or listed historic property or landmark. A complete application must be approved or denied within 60 days. Rentals created under this section must be longer than 30 days. Local objective standards cannot physically preclude up to two units or prevent either unit from reaching 800 square feet."
  },
  {
    "rule_id": "sb9-urban-lot-split",
    "pathway": "SB 9 — possible urban lot-split route",
    "display_group": "route",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-66411-7",
      "hcd-sb9-fact-sheet-2026-04"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "lot_split"},
      {"field": "sf_zone", "op": "eq", "value": "yes"},
      {"field": "in_urbanized_area", "op": "eq", "value": "yes"},
      {"field": "demolishes_protected_housing", "op": "eq", "value": "no"},
      {"field": "tenant_occupied_last_3_years", "op": "eq", "value": "no"},
      {"field": "ellis_withdrawal_last_15_years", "op": "eq", "value": "no"},
      {"field": "lot_split_on_historic_landmark_site", "op": "eq", "value": "no"},
      {"field": "lot_split_alters_historic_district_resource", "op": "eq", "value": "no"},
      {"field": "on_protected_site", "op": "eq", "value": "no"},
      {"field": "parcel_created_by_sb9_split", "op": "eq", "value": "no"},
      {"field": "adjacent_sb9_split_same_actor", "op": "eq", "value": "no"},
      {"field": "proposed_lot_ratio_compliant", "op": "eq", "value": "yes"},
      {"field": "proposed_lot_size_compliant", "op": "eq", "value": "yes"}
    ],
    "citation": {
      "source": "Gov. Code § 66411.7",
      "url": "https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV&sectionNum=66411.7",
      "excerpt": "The parcel map subdivides an existing parcel to create no more than two new parcels of approximately equal lot area provided that one parcel shall not be smaller than 40 percent of the lot area of the original parcel [...]. Except as provided [by a smaller local minimum], both newly created parcels are no smaller than 1,200 square feet. [...] The parcel has not been established through prior exercise of an urban lot split [...]. Neither the owner [...] nor any person acting in concert with the owner has previously subdivided an adjacent parcel using an urban lot split.",
      "verified_on": "2026-07-27"
    },
    "required_documents": [
      "tentative parcel map showing proposed lot areas",
      "owner-occupancy affidavit (three-year principal residence; statutory exception for qualifying community land trusts and nonprofit corporations)",
      "jurisdiction urban lot-split application form"
    ],
    "notes": "This route requires explicit confirmation of the encoded zoning, urbanized-location, protected-site, protected-housing, tenant, Ellis Act, and lot-split conditions. The parcel must not be on a historic-landmark property or designated historic site, and the proposal must not demolish or alter a contributing structure or exterior structural wall in a historic district. Neither resulting lot may be smaller than 40 percent of the original parcel. The lot-size answer is yes only when both resulting lots are at least 1,200 square feet or a current local ordinance has been verified to allow a smaller minimum that both lots meet. The original parcel cannot be a prior SB 9 split, and the same owner or a person acting in concert cannot have previously split an adjacent parcel under SB 9. The applicant generally must sign a three-year principal-residence affidavit; qualifying community land trusts and nonprofit corporations are excepted. A complete application must be approved or denied within 60 days."
  },
  {
    "rule_id": "adu-size-allowances",
    "pathway": "ADU — state-protected size options",
    "display_group": "standard",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-66314",
      "ca-gov-66321",
      "ca-gov-66323",
      "hcd-adu-handbook-2026-03"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "adu"},
      {
        "field": "primary_dwelling_status",
        "op": "in",
        "value": [
          "existing_single_family",
          "existing_multifamily",
          "proposed_single_family",
          "proposed_multifamily"
        ]
      }
    ],
    "citation": {
      "source": "Gov. Code §§ 66321(b)(1)–(2), 66314(d)(4)–(5), 66323(a)(1)",
      "url": "https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV&sectionNum=66321",
      "excerpt": "A local agency shall not establish [...] a maximum square footage requirement [...] that is less than [...] eight hundred fifty square feet of interior livable space [or] one thousand square feet [...] for an accessory dwelling unit that provides more than one bedroom. [A local rule also cannot set a minimum that prohibits an efficiency unit.]",
      "verified_on": "2026-07-27"
    },
    "required_documents": [],
    "notes": "These are protections against overly restrictive local size rules, not required minimum unit sizes. An applicant may propose a smaller unit. Any local maximum must still allow 850 square feet of interior livable space, or 1,000 square feet for an ADU with more than one bedroom. Where no compliant local ordinance exists, § 66314 supplies different attached and detached limits. Qualifying conversions under § 66323(a)(1) are not subject to unit-size limits."
  },
  {
    "rule_id": "adu-parking-limits",
    "pathway": "ADU — parking limits and no-parking conditions",
    "display_group": "standard",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-66314",
      "ca-gov-66322",
      "hcd-adu-handbook-2026-03"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "adu"},
      {
        "field": "primary_dwelling_status",
        "op": "in",
        "value": [
          "existing_single_family",
          "existing_multifamily",
          "proposed_single_family",
          "proposed_multifamily"
        ]
      }
    ],
    "citation": {
      "source": "Gov. Code §§ 66314(d)(10)–(11), 66322(a)",
      "url": "https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV&sectionNum=66322",
      "excerpt": "A local agency shall not impose any parking standards for an accessory dwelling unit [within a half-mile walk of public transit; in an architecturally and historically significant historic district; as part of the primary residence or an accessory structure; where on-street permits are required but unavailable to the ADU occupant; or within one block of car share]. [...] [The same applies to an ADU application submitted with a new primary-dwelling application when another listed criterion is satisfied.]",
      "verified_on": "2026-07-27"
    },
    "required_documents": [],
    "notes": "Outside an exemption, parking cannot exceed one space per ADU or bedroom, whichever is fewer; tandem parking on a driveway is allowed, and guest parking cannot be required. No ADU parking standard may be imposed when any § 66322(a)(1)–(5) condition applies: half-mile walking distance to public transit; qualifying historic district; ADU within the primary residence or an accessory structure; on-street permits required but not offered to the ADU occupant; or car share within one block. A jointly submitted new-primary-dwelling application also receives the exemption when the ADU or parcel satisfies another listed condition. Parking removed for ADU construction or conversion need not be replaced."
  },
  {
    "rule_id": "adu-no-owner-occupancy-rental",
    "pathway": "ADU on a single-family lot — occupancy and ordinary rental terms",
    "display_group": "standard",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-66315",
      "hcd-adu-handbook-2026-03"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "adu"},
      {
        "field": "primary_dwelling_status",
        "op": "in",
        "value": [
          "existing_single_family",
          "proposed_single_family"
        ]
      }
    ],
    "citation": {
      "source": "Gov. Code § 66315",
      "url": "https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV&sectionNum=66315",
      "excerpt": "No additional standards, other than those provided in Section 66314, shall be used or imposed, including an owner-occupant requirement, except that a local agency may require that the property may be used for rentals of terms 30 days or longer.",
      "verified_on": "2026-07-27"
    },
    "required_documents": [],
    "notes": "For an ADU evaluated under §§ 66314–66315 on a lot with a proposed or existing single-family dwelling, a jurisdiction cannot impose an owner-occupancy condition. A jurisdiction may require a rental term of at least 30 days; § 66315 does not require a term longer than 30 days. Separately conveyed ADUs under § 66341 and units created under § 66323 have distinct conditions and are not described by this rental-term record."
  },
  {
    "rule_id": "adu-conversion-exemptions",
    "pathway": "ADU — existing-space conversion or same-footprint replacement",
    "display_group": "standard",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-66314",
      "ca-gov-66323",
      "hcd-adu-handbook-2026-03"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "adu"},
      {
        "field": "primary_dwelling_status",
        "op": "in",
        "value": [
          "existing_single_family",
          "existing_multifamily",
          "proposed_single_family",
          "proposed_multifamily"
        ]
      },
      {
        "field": "adu_project_form",
        "op": "in",
        "value": [
          "conversion",
          "same_footprint_rebuild"
        ]
      }
    ],
    "citation": {
      "source": "Gov. Code §§ 66314(d)(7), 66323(a)(1), 66323(a)(3)",
      "url": "https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV&sectionNum=66314",
      "excerpt": "No setback shall be required for an existing living area or accessory structure or a structure constructed in the same location and to the same dimensions as an existing structure that is converted to an accessory dwelling unit or to a portion of an accessory dwelling unit.",
      "verified_on": "2026-07-27"
    },
    "required_documents": [
      "existing-condition plans or photographs showing the space, location, and dimensions"
    ],
    "notes": "This record matches only when the intake identifies an existing-space conversion or a new structure replacing an existing structure in the same location and dimensions. Those projects receive the no-setback treatment in § 66314(d)(7). Qualifying § 66323 conversions also receive the standards exemptions stated there. Building, health-and-safety, and fire requirements still apply."
  },
  {
    "rule_id": "adu-unpermitted-legalization",
    "pathway": "ADU — possible legalization of a unit built before 2020",
    "display_group": "route",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-66311-7",
      "hcd-adu-handbook-2026-03"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "adu"},
      {
        "field": "primary_dwelling_status",
        "op": "in",
        "value": [
          "existing_single_family",
          "existing_multifamily"
        ]
      },
      {"field": "unpermitted_existing", "op": "eq", "value": "yes"}
    ],
    "citation": {
      "source": "Gov. Code § 66311.7",
      "url": "https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV&sectionNum=66311.7",
      "excerpt": "A local agency shall not deny a permit for an unpermitted accessory dwelling unit or an unpermitted junior accessory dwelling unit that was constructed before January 1, 2020 [because of listed building-standard, state-law, or local-ordinance violations, subject to the substandard-building exception]. [...] A homeowner [...] shall not be required to pay impact fees or connection or capacity charges except [for the stated utility-infrastructure exception].",
      "verified_on": "2026-07-27"
    },
    "required_documents": [
      "permit application for the existing unit",
      "optional confidential third-party code inspection report from a licensed contractor"
    ],
    "notes": "For an unpermitted ADU built before January 1, 2020, denial cannot rest only on the violations listed in § 66311.7(a). The protection does not apply when the building is deemed substandard under HSC § 17920.3, and an agency may require corrections needed to meet those standards. The agency must publish its substandard-condition checklist and tell homeowners about the optional confidential pre-application inspection. Impact fees and connection or capacity charges are barred except for the limited utility-infrastructure exception. A local inspection may recommend health-and-safety corrections; the agency may not penalize the applicant for the unpermitted unit and must approve permits needed to correct noncompliance."
  },
  {
    "rule_id": "jadu-unpermitted-legalization",
    "pathway": "JADU — possible legalization of a unit built before 2020",
    "display_group": "route",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-66311-7",
      "hcd-adu-handbook-2026-03"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "jadu"},
      {
        "field": "primary_dwelling_status",
        "op": "eq",
        "value": "existing_single_family"
      },
      {"field": "unpermitted_existing", "op": "eq", "value": "yes"}
    ],
    "citation": {
      "source": "Gov. Code § 66311.7",
      "url": "https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV&sectionNum=66311.7",
      "excerpt": "A local agency shall not deny a permit for an unpermitted accessory dwelling unit or an unpermitted junior accessory dwelling unit that was constructed before January 1, 2020 [because of listed building-standard, state-law, or local-ordinance violations, subject to the substandard-building exception]. [...] A homeowner [...] shall not be required to pay impact fees or connection or capacity charges except [for the stated utility-infrastructure exception].",
      "verified_on": "2026-07-27"
    },
    "required_documents": [
      "permit application for the existing unit",
      "optional confidential third-party code inspection report from a licensed contractor"
    ],
    "notes": "The same § 66311.7 legalization protections for pre-2020 unpermitted units expressly cover JADUs. They remain subject to the substandard-building and necessary-correction boundaries, public-checklist requirements, limited fee exception, and inspection/remedy process described in this section."
  },
  {
    "rule_id": "adu-multifamily-66323",
    "pathway": "ADU — allowances on a lot with an existing multifamily dwelling",
    "display_group": "route",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-66321",
      "ca-gov-66323",
      "hcd-adu-handbook-2026-03"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "adu"},
      {
        "field": "primary_dwelling_status",
        "op": "eq",
        "value": "existing_multifamily"
      }
    ],
    "citation": {
      "source": "Gov. Code § 66323(a)(3)–(4)",
      "url": "https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV&sectionNum=66323",
      "excerpt": "A local agency shall allow at least one accessory dwelling unit within an existing multifamily dwelling and shall allow up to 25 percent of the existing multifamily dwelling units. [...] On a lot with an existing multifamily dwelling, not more than eight detached accessory dwelling units. However, the number [...] shall not exceed the number of existing units on the lot.",
      "verified_on": "2026-07-27"
    },
    "required_documents": [
      "site plan showing the existing multifamily dwelling, existing unit count, and proposed ADU locations",
      "floor plan identifying any non-livable space proposed for conversion"
    ],
    "notes": "An existing multifamily property can use two § 66323 branches. Non-livable portions of the existing structure can be converted into at least one ADU and up to 25 percent of the existing unit count. The lot can also add up to eight detached ADUs, never more than its existing unit count. Detached ADUs are subject to no more than four-foot side and rear setbacks and to the applicable § 66321(b)(4)(A), (B), or (C) height branch—not a blanket 16-foot cap. Rentals of units created under § 66323 must be longer than 30 days."
  },
  {
    "rule_id": "adu-multifamily-proposed-66323",
    "pathway": "ADU — allowances with a proposed multifamily dwelling",
    "display_group": "route",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-66321",
      "ca-gov-66323",
      "hcd-adu-handbook-2026-03"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "adu"},
      {
        "field": "primary_dwelling_status",
        "op": "eq",
        "value": "proposed_multifamily"
      }
    ],
    "citation": {
      "source": "Gov. Code § 66323(a)(4)(A)(iii)",
      "url": "https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV&sectionNum=66323",
      "excerpt": "On a lot with a proposed multifamily dwelling, not more than two detached accessory dwelling units.",
      "verified_on": "2026-07-27"
    },
    "required_documents": [
      "site plan showing the proposed multifamily dwelling and both proposed detached ADU locations"
    ],
    "notes": "A lot with a proposed multifamily dwelling can receive no more than two detached ADUs under § 66323(a)(4)(A)(iii). The existing-building conversion allowance does not apply until there is an existing multifamily dwelling with qualifying non-livable space. Detached ADUs are subject to no more than four-foot side and rear setbacks and to the applicable § 66321(b)(4)(A), (B), or (C) height branch. Rentals of units created under § 66323 must be longer than 30 days."
  },
  {
    "rule_id": "sb9-adu-interaction",
    "pathway": "SB 9 two-unit development — interaction with ADU and JADU rules",
    "display_group": "standard",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-65852-21",
      "hcd-adu-handbook-2026-03"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "two_unit"},
      {"field": "sf_zone", "op": "eq", "value": "yes"},
      {"field": "in_urbanized_area", "op": "eq", "value": "yes"},
      {"field": "demolishes_protected_housing", "op": "eq", "value": "no"},
      {"field": "tenant_occupied_last_3_years", "op": "eq", "value": "no"},
      {"field": "ellis_withdrawal_last_15_years", "op": "eq", "value": "no"},
      {"field": "two_unit_contributing_historic_location", "op": "eq", "value": "no"},
      {"field": "two_unit_individually_listed_historic_property", "op": "eq", "value": "no"},
      {"field": "on_protected_site", "op": "eq", "value": "no"}
    ],
    "citation": {
      "source": "Gov. Code § 65852.21 and State ADU Law — HCD ADU Handbook (March 2026)",
      "url": "https://www.hcd.ca.gov/sites/default/files/docs/policy-and-research/adu-handbook-update.pdf",
      "excerpt": "When an SB 9 lot split has not occurred, the lot is eligible to receive up to two primary units under SB 9, as well as whatever combination of ADUs and JADUs it would otherwise be entitled to under ADU Law.",
      "verified_on": "2026-07-27"
    },
    "required_documents": [],
    "notes": "This interaction record applies to the two-unit development route without an SB 9 lot split. Up to two primary units may be combined with the ADU and JADU units otherwise allowed by State ADU Law. If a proposal also seeks a lot split and the combined development would exceed four units, § 66411.7 is not required to provide the additional lot-split approval."
  },
  {
    "rule_id": "sb9-lot-split-adu-interaction",
    "pathway": "SB 9 lot split — two-unit-per-parcel interaction with ADU and JADU rules",
    "display_group": "standard",
    "route_class": "ministerial",
    "jurisdiction_scope": "statewide",
    "source_dependencies": [
      "ca-gov-66411-7",
      "hcd-adu-handbook-2026-03"
    ],
    "criteria": [
      {"field": "project_type", "op": "eq", "value": "lot_split"},
      {"field": "sf_zone", "op": "eq", "value": "yes"},
      {"field": "in_urbanized_area", "op": "eq", "value": "yes"},
      {"field": "demolishes_protected_housing", "op": "eq", "value": "no"},
      {"field": "tenant_occupied_last_3_years", "op": "eq", "value": "no"},
      {"field": "ellis_withdrawal_last_15_years", "op": "eq", "value": "no"},
      {"field": "lot_split_on_historic_landmark_site", "op": "eq", "value": "no"},
      {"field": "lot_split_alters_historic_district_resource", "op": "eq", "value": "no"},
      {"field": "on_protected_site", "op": "eq", "value": "no"},
      {"field": "parcel_created_by_sb9_split", "op": "eq", "value": "no"},
      {"field": "adjacent_sb9_split_same_actor", "op": "eq", "value": "no"},
      {"field": "proposed_lot_ratio_compliant", "op": "eq", "value": "yes"},
      {"field": "proposed_lot_size_compliant", "op": "eq", "value": "yes"}
    ],
    "citation": {
      "source": "Gov. Code § 66411.7 and State ADU Law — HCD ADU Handbook (March 2026)",
      "url": "https://www.hcd.ca.gov/sites/default/files/docs/policy-and-research/adu-handbook-update.pdf",
      "excerpt": "When a lot split occurs, SB 9 requires the local agency to approve up to two units on each parcel but specifically states that only two units are allowed per parcel, despite what ADU Law would otherwise allow. Those two units could be two primary \"SB 9 units,\" or one primary unit and one ADU, or one primary unit and one JADU.",
      "verified_on": "2026-07-27"
    },
    "required_documents": [],
    "notes": "After a qualifying SB 9 lot split, each resulting parcel is capped at two total units in an allowed combination of primary units, ADUs, and JADUs. This record is separate from the no-lot-split interaction so missing lot-split eligibility facts cannot produce a favorable unit-count result."
  }
]