Backyard accessory dwelling unit — Irvine, CA
Last updated: September 24, 2026
What affects the price
Building an ADU is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.
About this service
A backyard ADU is a detached small home built on your property, separate from your main house. People typically build these to create extra living space for family members, as a private home office, or to gain additional rental income. Because they are freestanding, you will need to consider utility hookups, site access for crews, and local setback requirements. Costs vary based on the foundation type and utility connections. Exact pricing confirmed free on the call.
Frequently asked in Irvine
Where can I find an accessory dwelling unit for rent in Irvine?
What is the permit cost for an accessory dwelling unit in Irvine?
How do I start ADU building in Irvine?
What are the local ADU regulations in Irvine?
Local ADU regulations in Irvine govern aspects such as minimum lot size, maximum ADU size (often 800-1200 sq ft depending on specific rules), setbacks, and height restrictions. The city mandates specific parking requirements and utility connection procedures. Compliance with California's state ADU laws, which often streamline approvals and limit local restrictions, is also a key factor. Understanding these rules is critical for any project.
Are there ADU services available in Irvine?
What is a prefabricated accessory dwelling unit (ADU) in Irvine?
A prefabricated accessory dwelling unit (ADU) in Irvine is a modular unit constructed off-site in a factory setting and then transported and assembled on your property. These units are built to California building codes and often offer faster construction timelines compared to traditional on-site builds. They can be a cost-effective and efficient option for adding housing in Irvine.
What is the cost of an accessory dwelling unit in Irvine?
Also serving nearby: Santa Ana · Costa Mesa · Mission Viejo · Orange · Garden Grove
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Irvine — population 314,621; about 4,795 residents per square mile across 65.6 sq mi. ZIP codes covered include 92602, 92603, 92604, 92606, 92612, 92614, 92616, 92617.
Neighborhoods served in Irvine: Eastwood, El Camino Real, Great Park Neighborhoods, Oak Creek, University Town Center — and every surrounding area.
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