Module 5 · Lesson 5
ADU Parking Rules
Most California ADUs need little or no parking. The half-mile transit rule, the garage conversion exemption, and the one-space maximum, explained.
Parking requirements used to be the quiet ADU killer — "sure, build a unit, just add two covered spaces you have no room for." State law defused this almost completely.
The ceiling: one space, maximum. A city can never require more than one parking space per ADU, and that space can be uncovered, tandem (behind another car in your driveway), or in a setback area. No new garage required, ever.
When even that one space is waived. The city can't require any ADU parking if:
- Your property is within half a mile walking distance of public transit (this covers a huge share of urban California)
- You're in a designated historic district
- The ADU is part of an existing structure (conversions)
- On-street parking permits exist but aren't offered to the ADU occupant
- A car-share vehicle is located within one block
The conversion superpower (again). When you demolish or convert a garage or carport to build an ADU, the city cannot require you to replace the lost parking. Your two-car garage becomes a home, and legally, the cars' problem is nobody's problem.
Practical honesty: legal minimums aren't the same as daily convenience. If your street fills up by 6 PM and your tenant will own a car, think through real parking during design — a driveway layout that fits one more car costs little and prevents years of friction.
Key takeaways
- Cities can require at most one ADU parking space — uncovered or tandem counts.
- Near transit, in historic districts, for conversions, or near car-share: zero spaces can be required.
- Garage conversions never require replacement parking.
- Plan real-world parking anyway — legality and convenience are different questions.