Pleasanton ADU and Zoning Guide for Homeowners

Last updated November 13, 2026. Reviewed by the Cash Home Buyers CA team.

Pleasanton allows accessory dwelling units (ADUs) and junior ADUs (JADUs) on lots with a single-family or multi-family home. The city publishes size, height and setback limits for state-exempt units, summarized below.

Pleasanton ADU rules at a glance

New detached ADU size	800 square feet or less
JADU size	No more than 500 square feet, inside the walls of a single-family home (including an attached garage)
Detached ADU height	16 feet or less (18 feet, plus 2 feet to match the main roof pitch, within one-half mile of a BART station)
Setbacks	Minimum 4 feet side and rear for a new detached ADU
Permit	Stand-alone building permit, or combined with other permits
Apply	Online Permit Center (Accela Citizen Access), choose Addition as project type
ADU contact	(925) 931-5630, 200 Old Bernal Avenue

JADU basics

A JADU needs an efficiency kitchen with a food preparation counter, may share or have its own bathroom, and must have a separate exterior entrance. It is processed together with remodels or additions to the main home.

Types of ADUs Pleasanton describes

Pleasanton describes accessory dwelling units as secondary residential units on the same property as a single-family or multi-family home. The city lists these forms:

• Detached new ADU: a newly built unit separate from the house, or a new unit on a multi-family property.
• Converted ADU: created from existing space such as a garage or shed.
• Attached ADU: created by converting space in the main home or by an addition.
• Junior ADU (JADU): a unit contained entirely within the walls of a single-family residence, including an attached garage.

Size, height and setback limits the city lists

JADU size	No more than 500 square feet
State-exempt new detached ADU size	800 square feet or less
State-exempt new detached ADU setbacks	Minimum 4 feet from side and rear property lines
State-exempt new detached ADU height	16 feet or less; 18 feet, plus 2 feet to match the main roof pitch, within one-half mile of a BART station
Conversion ADUs	May add up to 150 square feet to provide exterior ingress and egress

The city identifies state-exempt ADUs as a new detached ADU, conversions within the walls of the existing primary dwelling or existing structures, and ADUs within new single-family dwellings. The page does not list parking, fee or review-timeline details, so confirm those with the Community and Economic Development department at (925) 931-5630 or through the ADU contact form on the city’s ADU page.

Documents the city provides for ADU projects

Pleasanton publishes an ADU and JADU handout, a frequently asked questions sheet and sample application documents for ADUs, including sample plans, an energy report, a soils report, structural calculations, trusses and a Zone 7 form.

These show what a complete submittal looks like and can save time if you plan to build before selling. Permits themselves are applied for through the Accela Citizen Access portal, described in our Pleasanton building permits guide.

Legalizing an unpermitted unit

For an unpermitted ADU or JADU, the city points owners to its ADU and JADU amnesty and legalization checklist. A unit that is not legalized can limit your buyer pool because lenders and appraisers may not count it, and the unit can also be a material fact you need to disclose.

Questions to ask before you sell a property with an ADU

• Is the unit attached, detached or inside the main home, and which type does the city treat it as?
• Do you have the permit, plans and final inspection record?
• If the unit was converted from a garage or shed, was the conversion permitted?
• Does the unit fit within the size, height and setback limits above?

California disclosure rules for a property with a unit

If you know about an alteration or addition done without a required permit, treat it as a material fact.

Under Civil Code section 1102.1, an as-is sale does not waive delivery of the transfer disclosure statement or your duty to disclose material facts, and a late disclosure lets the buyer cancel within three days of in-person delivery or five days of mailing under section 1102.3.

Read our statewide as-is and unpermitted work guide for more, and our Prop 13 reassessment guide if the property is changing hands through inheritance.

Selling to a cash buyer lets you pass the property on as it stands, without finishing legalization first.

Property tax effects of adding or legalizing a unit

Under Proposition 13, California taxes a home at 1% of its taxable value plus voter-approved debt rates, and increases in base year value are generally limited to 2% a year until there is a change in ownership or new construction.

New construction can generally trigger a reassessment of the added value, and a change in ownership generally resets the assessed value to market value. If you build or legalize an ADU, ask the Alameda County Assessor how it will be treated. Our Prop 13 reassessment guide explains what the Board of Equalization says about reassessment.

Costs to plan for when you sell

The county documentary transfer tax is $0.55 per $500 of value or fraction of $500, with a possible city tax of half that amount. A $600,000 sale carries $660 at the county rate. Loan payoff, escrow and title fees, any commission and the proration of the year’s property tax all come out of proceeds.

If you add an ADU first, factor its permit, plan check and construction costs into the comparison with a direct as-is sale. Our seller closing costs guide lets you test both.

How to sell a house in Pleasanton

1. Confirm which units and additions are permitted.
2. Gather plans, permits and inspection records.
3. Request a no-obligation cash offer.
4. Pick your closing date.
5. Close with no repairs required.

Frequently asked questions

How big can a detached ADU be in Pleasanton?

The city lists 800 square feet or less for a new detached ADU under the state-exempt rules.

How do I apply for an ADU permit?

Submit plans through the city’s online Permit Center using Accela Citizen Access and select Addition when asked for the project type.

How big can a Pleasanton junior ADU be?

The city states that a JADU can be no more than 500 square feet and must be contained entirely within the walls of a single-family residence, including an attached garage.

What are the setback and height limits for a state-exempt detached ADU in Pleasanton?

The city lists a minimum 4-foot side and rear setback and a height of 16 feet or less, or 18 feet plus 2 feet to match the main roof pitch within one-half mile of a BART station.

Where do I find help legalizing an unpermitted ADU in Pleasanton?

Use the city’s ADU and JADU amnesty and legalization checklist, or call Community and Economic Development at (925) 931-5630.

More guides

• We Buy Houses in Alameda County
• Alameda County Property Tax Guide
• Pleasanton Building Permits Guide
• All California Guides

Sources

• City of Pleasanton: Accessory Dwelling Units

This guide is general information from public sources, not legal advice. Confirm current rules with the City of Pleasanton.