One of the first questions Los Angeles homeowners ask us is simple: what will an ADU actually cost? The honest answer is that it depends on the type, size, and finishes, but the ranges below will help you budget with confidence in 2026.
Typical ADU cost ranges
As a general guide for the Los Angeles area, expect roughly:
- Garage conversion: the most affordable path, since the structure already exists.
- Junior ADU (JADU): a small unit carved out of the existing home, also cost-effective.
- Detached new ADU: the most expensive, because it is built from the ground up with its own foundation and utilities.
Larger square footage, premium finishes, and difficult site access all push the number higher.
What drives the price
The biggest cost factors are size, whether the unit is attached or detached, kitchen and bathroom finishes, and utility connections (water, sewer, and electrical). Permit and design fees, plus any site grading, also matter.
How to keep costs reasonable
Garage conversions and standardized layouts are the most budget-friendly. A clear scope and a single accountable contractor prevent costly change orders mid-project. We provide a detailed, itemized estimate up front so there are no surprises.
Thinking about adding an ADU? See our ADU contractor page or request a free estimate.