Backyard accessory dwelling unit — Thousand Oaks, 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
This is a standalone structure built on your property, separate from your main house. People usually build these when they have extra yard space and want to create a private living area for family members or a home office. Factors like site accessibility, utility connections, and foundation type move the price up or down. Exact pricing confirmed free on the call.
Frequently asked in Thousand Oaks
What are the options for prefabricated accessory dwelling units in Thousand Oaks?
Prefabricated ADUs offer a faster construction timeline for your Thousand Oaks property. These units are built off-site and then transported and assembled on your lot. The pros we work with can guide you through selecting a prefabricated model that fits your space and budget. They ensure proper installation and connection to utilities. This can be a very efficient way to add living space. We can help you find the right option.
Can I build a home with an in-law suite in Thousand Oaks?
What is the permit process for an accessory dwelling unit in Thousand Oaks?
What are the considerations for homes with mother-in-law suites in Thousand Oaks?
Can I get an accessory dwelling unit rental in Thousand Oaks?
Who is a good accessory dwelling unit builder in Thousand Oaks?
What is the construction cost for an accessory dwelling unit in Thousand Oaks?
Also serving nearby: Simi Valley · Oxnard · San Buenaventura Ventura · Santa Monica · Santa Clarita
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Thousand Oaks — population 123,463; about 2,234 residents per square mile across 55.3 sq mi. ZIP codes covered include 91358, 91360, 91362.
Neighborhoods served in Thousand Oaks: Wildwood Canyon, Westlake Village, Oak Park, North Ranch, Newbury Park — and every surrounding area.
Areas we serve
Browse by state, then city.