Thousand Oaks and Newbury Park sit at the top of the Conejo Grade, about 25 to 30 minutes from Oxnard. According to the housing reports cities file with the state, Thousand Oaks permitted 97 ADUs in 2025, and many are higher-end guest houses and family units.
What shapes a Thousand Oaks ADU
- Hillside lots: slopes, retaining walls, drainage and access often drive the design and the budget
- Fire zones: much of the Conejo Valley edge is in a designated fire hazard severity zone, requiring ignition-resistant construction
- HOAs: communities like Dos Vientos, North Ranch and Lynn Ranch have design guidelines your ADU will need to follow
- Architecture: buyers and tenants expect an ADU that matches the quality of the main home
Popular projects
- Guest houses and casitas for visiting family and aging parents
- Two-bedroom detached ADUs for long-term rental near Amgen, Cal Lutheran and the 101 business corridor
- Garage conversions in established neighborhoods of Newbury Park and central Thousand Oaks
Request a free consultation and a builder will look at your Thousand Oaks lot.
Services available in Thousand Oaks
- Detached ADUs in Thousand Oaks — A separate backyard home, from a 400 sq ft studio to a 1,200 sq ft two-bedroom.
- Garage Conversions in Thousand Oaks — Turn your garage into a legal, permitted ADU, usually the fastest and lowest-cost option.
- Junior ADUs (JADUs) in Thousand Oaks — A private suite of up to 500 sq ft inside your existing home, with its own entrance.
- Attached ADUs & Additions in Thousand Oaks — An ADU built onto the side or back of your house, sharing a wall but not your living space.
- Two-Story ADUs in Thousand Oaks — More living space on a small footprint, including ADUs over a garage.
- Prefab & Modular ADUs in Thousand Oaks — Factory-built ADUs with local site work, foundations, utilities and permits.
- ADU Design & Permits in Thousand Oaks — Floor plans, engineering, Title 24 and the Oxnard permit process, handled for you.
Thousand Oaks questions
Do ADUs in Thousand Oaks have to meet wildfire building standards?
Properties in designated fire hazard severity zones must meet California's wildland-urban interface construction standards, such as ignition-resistant siding, vents and roofing. Many Thousand Oaks and Newbury Park hillside lots fall in these zones.
Can my HOA prevent an ADU in Thousand Oaks?
Under California Civil Code section 714.3, an HOA cannot prohibit or unreasonably restrict ADUs on single-family lots, but it can apply reasonable design standards. Review your CC&Rs and design guidelines early.
Who issues ADU permits in Thousand Oaks?
ADUs in Thousand Oaks are permitted through the City of Thousand Oaks Community Development Department.