Accessory dwelling unit permit cost — Long Beach, CA
Last updated: September 24, 2026
What affects the price
Building an ADU involves several moving parts that shape your total investment. The final figure depends heavily on whether you choose a prefab unit or a custom build from the ground up. Site conditions are another major factor; if your property requires extensive grading, utility trenching, or foundation work, costs will climb. You also have to consider your choice of finishes, like high-end appliances or custom cabinetry. Navigating local permit fees and impact assessments also adds to the total.
Frequently asked in Long Beach
Can I get an ADU quote for my property in Long Beach?
Who are some accessory dwelling unit builders near me in Long Beach?
What is the permit process for an ADU in Long Beach?
Are there affordable accessory dwelling unit options for Long Beach homeowners?
What is the cost of an accessory dwelling unit in Long Beach?
What are the benefits of a detached accessory dwelling unit in Long Beach?
Who are some of the best ADU contractors in Long Beach?
Also serving nearby: Carson · Compton · Westminster · Norwalk · Huntington Beach
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Long Beach — population 449,468; about 8,870 residents per square mile across 50.7 sq mi. ZIP codes covered include 90801, 90802, 90803, 90804, 90805, 90806, 90807, 90808.
Neighborhoods served in Long Beach: Belmont Shore, Naples, Alamitos Beach, Downtown Long Beach, Lakewood Village — and every surrounding area.
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