California ADU rules · Alameda County
Can I Build an ADU in Pleasanton?
Yes — you can build an ADU in Pleasanton. California's statewide ADU law requires every city, including Pleasanton, to approve a qualifying accessory dwelling unit by right, plus a junior ADU (JADU) on a single-family lot. What varies city to city are the local specifics below.
Can you build one?
ADUs allowed
CA state lawYes — by right
ADUs and JADUs are allowed by right in all residential and mixed-use zones; ministerial approval, no hearing.
Units on a single-family lot
Local rule1 detached ADU (≤800 sqft), 1 conversion ADU, 1 JADU
Pleasanton allows both a detached ADU (≤800 sqft) and a conversion ADU, plus a JADU, on a single-family lot.
Units on a multifamily lot
Local ruleConversion: at least 1, up to 25% of units; Detached: up to 2 (proposed multifamily) or up to 8 (existing multifamily), not to exceed number of existing units
Detached ADUs on multifamily lots are capped at 2 for proposed multifamily and 8 for existing multifamily, not to exceed the number of existing units.
Junior ADU (JADU)
CA state lawAllowed
Up to 500 sq ft, within the walls of an existing single-family home (single-family lots only).
Size & height
Max detached ADU size
Local rule1,000 sq ft
Local maximum is 850 sqft (studio/1-bed), 1,000 sqft (2+ beds); conversion of existing accessory buildings may exceed these limits.
Max attached ADU size
Local ruleMax 50% of main dwelling’s floor area or 800 sqft (whichever is greater); max increase: 850 sqft (studio/1-bed), 1,000 sqft (2+ beds); conversion of existing space may exceed these limits
Pleasanton sets both a percentage and absolute cap, with exceptions for conversions.
Guaranteed minimum size
CA state law800 sq ft
An 800 sq ft ADU must be allowed regardless of FAR/lot-coverage caps; a city also cannot cap an attached ADU below 850 sq ft (1,000 for 2+ bedrooms).
Max JADU size
CA state law500 sq ft
Max height
CA state law16 ft
16 ft baseline; cities must allow 18 ft within ½ mi of a major transit stop or where the primary dwelling is two-story, and 20 ft on a lot with a multistory multifamily building.
Setbacks
Side setback
Local rule4 ft
4 ft minimum for detached ADUs; conversions may maintain existing setbacks.
Rear setback
Local rule4 ft
4 ft minimum for detached ADUs; conversions may maintain existing setbacks.
Front setback
Local ruleMust meet main structure’s front setback for the zone
Front setback must match the main structure’s zone requirement.
Separation from main house
CA state lawNone required
No statewide separation requirement between the ADU and the primary dwelling.
Parking
Parking required
Local ruleUp to 1 space
1 off-street space per ADU, with multiple exemptions.
Transit parking exemption
Local ruleYes — no parking required near transit & for conversions
No parking required if within ½ mile of public transit or other listed exemptions.
Garage-conversion replacement parking
Local ruleNot required
No replacement parking required for garage/carport conversions to ADU.
Approval, timeline & cost
Approval path
CA state lawMinisterial (by right)
No public hearing or discretionary design review for a qualifying ADU.
Approval timeline
CA state law60 days
The agency must act within 60 days of a complete application — and the ADU is deemed approved if it does not.
Owner-occupancy
Local ruleOnly for a JADU
Owner-occupancy required only for JADUs, not for ADUs.
Impact-fee waiver
CA state lawWaived under 750 sq ft
An ADU of 750 sq ft or less pays no impact fees (the 750 sq ft threshold itself is exempt under § 66311.5); larger ADUs pay fees proportional to the primary dwelling. JADUs (≤ 500 sq ft) are exempt.
Permits required
CA state lawBuilding permit
Only a ministerial building permit — no conditional use permit or discretionary design review for a qualifying ADU.
Pleasanton-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Fire marshal requirements
ADUs must meet fire marshal requirements and address signage standards.
Historic resource protection
ADUs must not adversely impact properties listed in the California Register of Historical Resources.
Pleasanton sets a local detached ADU maximum of 1,000 sqft (2+ beds) and 850 sqft (studio/1-bed), with exceptions for conversions. Detached ADU height is 16 ft standard, but up to 18 ft (+2 ft for roof pitch) near transit or on multifamily lots.
Frequently asked questions
Can I build an ADU in Pleasanton?
Yes. California's statewide ADU law requires Pleasanton to approve a qualifying accessory dwelling unit ministerial (by right), plus a junior ADU (JADU) on a single-family lot.
How big can an ADU be in Pleasanton?
A detached ADU of at least 1,000 sq ft must be allowed, and an ADU of 800 sq ft can never be zoned out by floor-area or lot-coverage limits. A JADU can be up to 500 sq ft.
What are the setback requirements for an ADU in Pleasanton?
Side and rear setbacks are limited to 4 ft. Must meet main structure’s front setback for the zone.
Is parking required for an ADU in Pleasanton?
Up to 1 space. No parking can be required within ½ mile of transit, for conversions, or for units inside the primary home. When a garage is converted, replacement parking is not required.
How long does ADU approval take in Pleasanton?
A complete application must be acted on within 60 days, with ministerial (by right) — no public hearing or discretionary design review for a qualifying ADU.
Do I have to live on the property to build an ADU in Pleasanton?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Pleasanton Municipal Code Chapter 18.106 (Ord. 2300, 10/21/2025)
- §18.106.030.C
- §18.106.045.C
- §18.106.040
- §18.106.045.B
- §18.106.045.B, §18.106.040
- §18.106.060.C.7
- §18.106.060.C.7.b
- §18.106.030.D, §18.106.070.F
- §18.106.060.F
- §18.106.060.C
- Cal. Gov. Code §§ 66310–66342 (ADU Law)
- HCD 2025 Accessory Dwelling Unit Handbook
- Cal. Gov. Code § 66317 (ministerial approval, 60-day deadline)
- Cal. Gov. Code § 66333 (junior ADUs)
- Cal. Gov. Code § 66321 (size minimums & height)
- Cal. Gov. Code § 66323 (by-right ADU/JADU, 800 sq ft, 4-ft setbacks)
- Cal. Gov. Code § 66311.5 (impact fees: none for an ADU ≤ 750 sq ft or JADU ≤ 500 sq ft)
Last updated 2026-06-25. This is an AI-assisted summary of Pleasanton's ADU rules, drawn from its published ordinance and California ADU law — general information, not legal advice, and it may be incomplete or out of date. Verify the controlling rule for your specific parcel with Pleasanton Planning before relying on it.
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