Junior ADU: the lightest way to add a private unit
A junior ADU (JADU) is a unit of up to 500 sq ft created within the walls of an existing or proposed single-family home. It typically has its own entrance and an efficiency kitchen.
Why homeowners choose it
- Minimal construction: you work within the existing footprint.
- Exempt from impact fees under state law.
- Ideal for a parent, an adult child or a caregiver close by, with privacy for everyone.
What to check
The layout of your home, where a separate entrance can go, and which systems can be reused. A lot can often include a junior ADU in addition to a regular ADU.
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Keep reading
Two detached ADUs on one lot: what changes in 2027 (AB 956)
From January 1, 2027, California cities must approve up to two detached ADUs behind a single-family home. What it means for Los Angeles owners, and the catch.
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Can you build an ADU in your Los Angeles backyard? The rules that decide
Setbacks, size, fees, parking and junior ADUs: the California rules that decide what your lot can hold, explained plainly.
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What really drives the cost of an ADU in Los Angeles
Six factors explain most of the difference between two ADU budgets. Here is how to read them before you ask for a price.
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