Detached accessory dwelling unit — Los Angeles, CA
Last updated: September 24, 2026
What affects the price
Building an ADU is a major project, and the final bill depends on a few key things. Site prep is a big factor; if your land is sloped or needs extensive utility connections, costs go up. The materials you choose—from siding to kitchen finishes—also change the math significantly. Whether you’re building a detached unit or converting an existing garage shifts the permit requirements and structural work needed. We provide exact pricing confirmed free on the call.
About this service
A detached ADU is a standalone building separate from your main home, like a backyard cottage. These provide the most privacy for you or your tenants since there are no shared walls. You need this if you have a large enough yard to accommodate a separate structure.
Frequently asked in Los Angeles
Can I get an ADU built in 24 hours in Los Angeles?
How do I find a good ADU company in Los Angeles?
What's the typical cost for an accessory dwelling unit permit in Los Angeles?
What factors influence the cost to build an accessory dwelling unit in Los Angeles?
What kind of services do ADU companies offer in Los Angeles?
Are modular accessory dwelling units a good option in Los Angeles?
What are the main things to know about accessory dwelling units (ADUs) in Los Angeles?
Also serving nearby: Santa Monica · Inglewood · South Gate · Compton · Torrance
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Los Angeles — population 3,820,914; about 8,120 residents per square mile across 470.5 sq mi. ZIP codes covered include 90001, 90002, 90003, 90004, 90005, 90006, 90007, 90008.
Neighborhoods served in Los Angeles: Hollywood, Santa Monica, Pasadena, Downtown LA, Beverly Hills, Venice — and every surrounding area.
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