Pleasanton, CA Accessory Structures: Garage Conversions (2026)
Garage conversion rules in Pleasanton, CA, sometimes called garage-to-ADU or accessory living unit conversions, govern permits, ceiling height, egress, and parking replacement.
Key Facts
- Garage door
- Owner may keep it or remove/infill, § 18.106.070(B)(4)
- Parking replacement
- Not required after conversion, § 18.106.070(B)(7)(b)
- Height
- Existing structure height may exceed 16-ft cap
- Setbacks
- Existing setbacks kept, no new minimum required
- Size limit
- 850/1,000 sq ft ADU cap waived for conversions
Summary
Converting a Pleasanton garage into an accessory dwelling unit is allowed under Chapter 18.106, and the owner may choose to remove the garage door or leave it in place. Lost parking spaces do not have to be replaced, and a converted detached structure can keep its existing height and setbacks even if they exceed the standard ADU limits.
If garage space is converted to an accessory dwelling unit, at the option of the property owner, the existing garage door(s) may either be left in place, or removed and infilled such that the wall appears integrated with rest of the home, with the same exterior wall material, building color, and trim as the primary dwelling structure.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4955754; v17 updated 2026-06-02).
Full Breakdown
" Detached garages get further latitude on dimensions. 050(B) allows the converted unit to "maintain the same setbacks as the existing structure, with no minimum setback required," rather than the standard four-foot side and rear setback. 050(C) lets a conversion "exceed these size limits" of 850 or 1,000 square feet that apply to new detached construction. 106 implements state ADU law (Government Code Sections 66310 through 66342), which requires cities to streamline conversions of existing structures rather than treat them as new construction.
Violations & Fines
Garage-conversion ADUs are permitted uses reviewed without discretionary hearing under Section 18.106.030(D), so noncompliance is handled as a building or zoning code issue rather than a use-permit revocation. An unpermitted garage conversion is treated like any other Title 18 violation: Section 18.140.010 designates it a public nuisance subject to city attorney abatement, removal or injunctive action, with cumulative remedies.
Frequently Asked Questions
If I convert my garage to an ADU, do I have to build new parking?
Can I leave the garage door on a converted garage ADU?
Does my converted garage ADU have to meet the standard 16-foot height limit?
Do I need the standard four-foot side and rear setbacks for a garage conversion?
Sources & Official References
Other rules in Pleasanton
California rules heatmap·Compare Pleasanton to another location·View the California accessory structures overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.
Garage Conversions in Nearby Cities
How other cities in Alameda County handle garage conversions.