ADU Builder in Ventu Park, Newbury Park

A Different Kind of Newbury Park Lot for an ADU

The planned communities of Thousand Oaks were laid out all at once. Ventu Park grew one lot at a time. Parcels were first sold in the 1940s as getaway properties, and over the decades owners built cabins, replaced them, added rooms and put up garages and workshops. The result is a neighborhood of irregular lot shapes, varied house ages and plenty of mature trees, with the hills of the Santa Monica Mountains rising behind it.

That history makes every Ventu Park ADU a custom project. There is no standard lot to design against. We start with a boundary survey, because older parcels sometimes have fences or structures that do not line up with the recorded lines, and a topographic map, because many lots slope. Existing outbuildings get a close look too: a sound workshop or garage can be converted to an ADU, which is often faster than building new.

Rural Roads, Construction Access and Fire Apparatus

Ventura County's Thousand Oaks Area Plan calls for rural road improvements in Ventu Park, which tells you something about the streets. Roads are narrower and more winding than in the city's tracts, and some driveways are long or steep. That affects an ADU project in two ways.

First, construction logistics. Concrete trucks, lumber deliveries and, for a prefab unit, a delivery truck and crane all need room to turn and stage. We map the route and the staging area before committing to a construction method. Second, fire access. The Ventura County Fire Department reviews whether its apparatus can reach the new unit and whether water supply is adequate. On lots with limited access, that review can shape the location of the ADU or lead to fire sprinklers.

• Boundary and topographic survey on older parcels
• Delivery route and staging plan for narrow roads
• Fire apparatus access and water supply review
• Evaluation of existing outbuildings for conversion

Ventura County ADU Rules in Ventu Park

Ventu Park, including Upper Ventu Park, is unincorporated. ADUs here are reviewed by the Ventura County Resource Management Agency under the county's Non-Coastal Zoning Ordinance, which the Board of Supervisors updated in 2024 and HCD found compliant with state law in January 2025. The Planning Division handles the ADU review and Building and Safety issues the permit after plan check.

State law still sets the minimums. On a single-family parcel, the county must allow three units by right: one carved from existing space, one junior unit inside the house, and one new backyard building as large as 800 sq ft, which may sit 4 feet from side and rear lines. None of them needs a hearing. Parcels near the hills may also be in a mapped fire hazard zone, which brings ignition-resistant construction requirements.

Older properties sometimes include rooms or structures built without permits. The county ADU process can be a route to legalizing them, provided health and safety issues are corrected.

Utilities and Terrain on Ventu Park ADU Sites

Because the neighborhood developed gradually, utility arrangements vary from lot to lot. We confirm the water provider and the size of the existing service, whether the house connects to public sewer or relies on a private wastewater system, and the capacity of the electrical service from SCE. A private system has to be evaluated for the added load of a second unit, and that review can drive the design.

Slopes and trees round out the site work. Many lots need a soils report, drainage planning and a foundation that steps with the grade. Large oaks are common, and we place footprints and trenches to protect them.