Cost to build 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
Building an ADU involves costs for permits, site prep, foundation, framing, plumbing, and electrical work. Prices fluctuate based on whether you choose a custom design or a pre-planned layout, as well as the complexity of connecting to existing city utilities. Exact pricing confirmed free on the call.
Frequently asked in Los Angeles
What are the main steps for building an ADU in Los Angeles?
Can you tell me about the pros who build ADUs in Los Angeles?
What are the disadvantages of having an ADU on my property?
How do I get a permit for an ADU in Los Angeles?
What's involved in getting an ADU estimate in Los Angeles?
What does 'accessory dwelling unit' actually mean?
An accessory dwelling unit, or ADU, is a secondary housing unit on a single-family residential lot. It's essentially a smaller, independent living space attached to or detached from the main home. ADUs can be used for family members, renters, or as a home office. They're designed to provide additional housing without requiring a new, separate lot. The pros can explain the different types of ADUs that can be built on your Los Angeles property.
Are there specific requirements for building an ADU 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, Downtown LA, Santa Monica, Beverly Hills, Pasadena, Silver Lake — and every surrounding area.
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