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HCD March 2026Gov. Code §§66314, 66322, 66323

California ADU
Parking Screen

Check the enumerated state-law exemptions from local ADU parking standards. If none applies, the result reports only the maximum number a local agency may require—not the actual local requirement.

Who it's for: California architects and homeowners screening ADU parking exemptions at pre-design, before permit application.

Verified conditions

How to use this calculator

1
Enter bedrooms
Use zero for an efficiency unit or studio.
2
Select only verified exemptions
Do not infer transit distance, historic status, car-share proximity, or §66323 eligibility.
3
Read exemption or cap
An exemption prohibits local parking standards; otherwise the result is only the statewide maximum a local ordinance may impose.

The formula

If any implemented Government Code §66322 exemption or verified §66323 path applies, local parking standards may not be imposed. Otherwise, the local requirement may not exceed one space per ADU or per bedroom, whichever is less.

Worked example

Example
A one-bedroom ADU verified within one-half mile walking distance of public transit is exempt from local parking standards. A nonexempt one-bedroom ADU may be subject to a local requirement, capped at one space.

When this estimate will be off

  • Does not establish §66323 eligibility, walking distance, transit status, historic-district status, permit policy, car-share location, or local ordinance requirements.
  • The simultaneous-new-dwelling application condition must be reviewed directly against all criteria in Government Code §66322(a); it is not inferred by this screen.
  • Parking design, tandem feasibility, setback siting, topography, fire/life-safety findings, accessibility, and entitlement are excluded.

Frequently asked questions

A common mistake: Does not establish §66323 eligibility, walking distance, transit status, historic-district status, permit policy, car-share location, or local ordinance requirements.

No. If no exemption is selected it reports only the statewide maximum; the current local ordinance may require less or nothing.

No. The HCD exemption says one-half mile walking distance of public transit.

HCD states guest parking cannot be required and qualifying parking demolished or converted with an ADU need not be replaced.

Sources

  • California HCD ADU Handbook, March 2026 — Parking Requirements — official list of exemptions, one-space/per-bedroom cap, guest and replacement parking rules
  • California Government Code §§66314(d)(10)–(11), 66322(a), and 66323 — current statutory framework; verify current text and project eligibility

Sources and review record

Sources and method basis

Limitations

  • Exemption and statewide-cap screen only; does not establish eligibility or the actual local requirement and omits the fact-intensive simultaneous-new-dwelling condition.

This free California ADU Parking Calculator is built and maintained by DataDrivenAEC, using the relevant codes and standards. It does not substitute for professional judgment.