FAQ
Which permits and approvals should I plan for with an attached ADU project in Los Angeles?
Attached ADU permits in Encino or Los Angeles are about a unit connected to the primary dwelling—shared walls or roof junctions, connection plan sets, and City desk filings—distinct from freestanding backyard cottages.
Direct answer
Plan for a connection-to-primary filing path—not backyard freestanding shorthand.
An attached ADU project in Los Angeles usually needs confirmation the unit connects to the primary dwelling, a plan set covering shared structure and separations, and City of LA / local AHJ plan check before permits issue.
This is not a freestanding backyard ADU, not a JADU inside an existing room alone, and not only a detached-cottage conversation. City of LA / local AHJ decides. Not legal advice.
121 Design Build maps attached ADU approvals without inventing fee schedules.
Permit drivers
Connection, shared structure, then AHJ desks.
Unit connected to the primary dwelling
Confirm the ADU shares a wall, roof, or structural connection—not a freestanding backyard cottage.
Plan set for shared structure and systems
Architectural, structural, and MEP sheets covering the connection drive the package the City reviews.
City of LA / local AHJ review
Comment cycles and queues are owned by the City. We do not invent fees or legal outcomes.
Encino context
Encino attached ADUs still answer to City desks.
Working from Encino does not skip connection filings. Documents still answer to City of LA / local AHJ for a unit tied to the primary dwelling.
Use backyard ADU permit pages when the real question is rear-yard freestanding placement—not attached-unit permitting.
How we work
How 121 Design Build scopes attached ADU permits.
01
1. Confirm attached ADU is the frame
Separate connection-to-primary permits from backyard freestanding, garage, and JADU paths.
02
2. Size assumptions early
Clarify shared wall, roof, and system tie-ins before deep filing.
03
3. Assemble the plan package
Keep architectural, structural, and systems sheets honest for an attached unit.
04
4. Sequence City comments honestly
Track AHJ rounds without inventing fees—City of LA / local AHJ decides.
Honest scope
When attached ADU permits are the right conversation
We map
Connection-to-primary approval path
Use this page for attached ADU permits. Backyard ADU permit pages cover rear-yard freestanding framing separately.
We do not
No invented fees
We do not invent fees or give legal advice. City of LA / local AHJ decides.
Talk with 121 Design Build about attached ADU permits.
Call (424) 600-2100 or email info@121designbuild.com. 121 Design Build, 17801 Ventura Blvd, 2nd floor, Encino, CA 91316.