ADU Pathway Selection

The City of Los Angeles recognizes six practical ADU plan-check pathways: Ordinance Detached, Ordinance Attached, State Detached, State Attached, JADU (Junior ADU), and Movable Tiny House. Each has its own size limit, height limit, setback rule, and unit-combination rule with the existing dwelling and any other ADU on the lot. Pathway selection is the gating decision for almost every other rule on the project — the design parameters that apply downstream depend on which pathway the project follows.

LAMC §12.22 A.33(b) enumerates the pathways through Applicability sub-paragraphs (b)(1) through (b)(6). The local pathways live at §12.22 A.33(c) through (g): Development Standards at (c), Detached at (d), Attached at (e), Movable Tiny House at (f). The state pathways and JADU operate under California Government Code provisions for ADUs. The LAMC text as loaded invokes the older numbering at GC §65852.2 and §65852.22; the new numbering at GC §66310 through §66333 came from the 2024 California ADU statute renumbering. PC/STR/Corr.Lst.20A Parts II.A through II.J set the plan-check structure.

A correction that the project has been classified under the wrong pathway — for example, drawn as an Ordinance Detached but submitted as a State Detached, or claimed as a JADU when the unit exceeds 500 square feet. The correction may require re-classifying the project, sometimes accompanied by a redraw to satisfy the correct rule set. Plan check may also flag a project that claims state preemption protections without meeting the threshold conditions.

Choosing the pathway based on the desired unit size alone, without testing how the choice cascades into setback, height, parking, and unit-combination rules. A second pattern is treating the State Detached pathway as a default escape from local rules — the pathway has a protected baseline and the design has to fit within it to invoke the protection. A third pattern is conflating the JADU and the Attached ADU; the JADU typically caps at 500 square feet within an existing or proposed single-family dwelling.

Pathway selection drives downstream rules: size limit, setback rule, height limit, parking exemption eligibility, unit-combination behavior, and which correction-sheet section the project gets reviewed against. Owners typically benefit from a pathway matrix at the feasibility stage that compares the six pathways against the lot’s specific facts before drawings begin.

The 10-Foot Separation Rule (pathway choice interacts with detached-ADU siting), Residential Floor Area (ADU floor area may interact with the lot’s RFA cap depending on the pathway), Lot Cut Date and Certificate of Compliance (lots with unresolved subdivision history may face siting issues independent of the pathway), and the State Preemption Footnote entry (where state law protects a specific baseline ADU configuration from local rules that would otherwise preclude it).

Verification: §12.22 A.33 ADU heading at LAMC line 18345; (b) Applicability and pathway enumeration at LAMC line 18353; (c)(1)(iii) state preemption protected baseline (800 sf, 16 ft, 4-foot setbacks) at LAMC line 18397; (c)(7) clarifying provision at LAMC line 18441; (c)(12) parking exemption matrix at LAMC line 18465; (d)(1) Detached 1,200 sf cap at LAMC line 18497; (e)(1) Attached 50-percent rule at LAMC line 18521; (e)(3) Attached 850/1,000 sf floor at LAMC line 18529; (f) Movable Tiny House provisions at LAMC line 18533. The LAMC source as loaded references the older Government Code numbering (§65852.2 and §65852.22) at LAMC line 18349; the 2024 statutory renumbering to GC §66310–§66333 post-dates the loaded text and was not directly loaded for this draft. Pathway names follow the locked LADBS hub’s six-pathway naming convention.