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City notesAlameda County, California

Oakland's building criteria for ADUs on one-family lots

Oakland asks applicants to certify their project against a building criteria checklist. Much of it is about utilities, and a few items can change a design that looked finished.

At a glance

7 ft 6 in
minimum ceiling height in habitable space1
150 sq ft
minimum living, eating and sleeping room1
Over 50%
demolished turns a conversion into new construction1

Key points

  • A new detached ADU must be all-electric, with no gas appliances.1
  • The ADU's sewer connection can't run under the main house.1
  • Removing more than half of an existing building turns a conversion into new construction.1
  • Wall openings must be at least 5 feet from the property line, or 3 feet if sprinklered.1

How the checklist works

The checklist for one-family lots is marked as updated in February 2025.1 It states that an ADU may only be granted if the applicant can answer "Yes" or "N/A" to every item.1 The applicant then signs to certify that the project conforms.1

Utilities: where designs most often change

All-electric. Newly constructed detached ADUs must be all-electric under Oakland Municipal Code 15.37.1 The checklist states it both ways: no gas appliances are allowed in a detached ADU.1 Plan for electric heating, water heating and cooking from the start, and size the electrical service to match.

Panel and meter. The ADU needs access to its own electrical panel, and the checklist cites a state utility rule requiring a separate electrical meter for ADUs other than JADUs.1

Sewer. The ADU's plumbing branch connection to the sewer lateral must not sit underneath the primary home.1 On a lot where the lateral runs under the house to the street, that can mean a new route and more trenching than expected.

Heating. The unit has to be heated separately, with each household able to reach its own heating equipment and water heater.1

Access and addressing

The ADU needs its own way in and out, and its path of egress can't pass through the primary home or another dwelling.1 ADUs get separate addresses; a JADU does not.1

Room sizes

  • Ceilings of at least 7 feet 6 inches in habitable space, and 7 feet in bathrooms, toilet rooms and laundry rooms.1
  • A combined living, eating and sleeping room of at least 150 square feet, plus a separate permanent clothes closet.1

Fire separation

No wall openings may be closer than 5 feet to the property line, or 3 feet where the building is sprinklered.1 The city may ask for a surveyor's certification to show the ADU is within the property and meets fire separation distances.1

State law lets a city require no more than a four-foot side and rear setback.2 A wall at four feet is therefore allowed to stand there, and under Oakland's checklist it can't have a window or door in it unless the building is sprinklered.

Sprinklers are required throughout when an addition takes the combined floor area of the ADUs and the primary home over 3,600 square feet, or when the primary home is required to have them.1

Conversions: the 50% rule

Two notes at the foot of the checklist matter for older buildings. Demolishing more than 50% of an existing building requires a demolition permit, and the project is then treated as a new building, not a conversion, for building code purposes.1 And if site conditions during construction call for removing more than half, a revision has to be submitted before removal continues.1

Buildings that are dug down to gain height must meet new-construction requirements at the lower level and include engineered foundation and structural plans.1 Attached ADUs also carry a sound transmission requirement between units.1

Our read

In Oakland, walk the utilities before you draw the rooms. Find the sewer lateral, check the electrical service, and assume no gas in a detached unit. On a conversion, get an honest view from your contractor on how much of the old structure will survive, because crossing 50% changes which code applies.

Common questions

Can I have a gas stove in a detached ADU in Oakland?

No. Newly constructed detached ADUs must be all-electric1, and the checklist states that no gas appliances are allowed in a detached ADU.1

What is the minimum ceiling height for an ADU in Oakland?

Seven feet six inches in habitable space, and seven feet in bathrooms, toilet rooms and laundry rooms.1

When does a conversion count as new construction?

When more than 50% of the existing building is demolished or deconstructed. It then needs a demolition permit and is treated as a new building for building code purposes.1 Long Beach draws its own line for garage conversions; see who can use its conversion application.

Keep reading

About this page

Written by
The Lotline Editorial Team. Editorial policy
Where it comes from
We wrote this from material published by City of Oakland and California Legislative Information. You'll find each document, and the part we used, under References below.
How it was checked
Before publishing, we checked each statement against the original wording of its source. How we work
Last reviewed
. Rules and city procedures change, so confirm current requirements with your permitting agency.
Corrections
Email support@lotlinepermits.com. We check every report against the document and fix what is wrong.

References

  1. 1One-Family ADU Application, ADU Building Criteria Checklist (updated February 2025)City of Oakland, Planning and Building Department. Read on November 10, 2026.Cited: page 1; page 2, Note; page 2, Building Safety; page 2, Room Dimensions; page 1, footer; page 2; page 1, General Building Code Requirements.
  2. 2California Government Code, Title 7, Division 1, Chapter 13, Article 2 (Sections 66314 to 66331)California Legislative Information. Read on November 10, 2026.Cited: § 66314(d)(7).

General information, not legal advice. Read the disclaimer.