Your ADU Contractor in Westlake Village

Ask two questions before you ask for a number. Has the builder filed a Zoning Clearance with the city and a plan check through EPIC-LA on the same project? Has it carried a fuel modification plan through LA County Fire's Forestry Division and a committee package through an HOA on the first pass? Master Construction is licensed and insured under Lic. #1027281, family owned in Ventura since 1994, and builds ADUs in Westlake Village with in-house electrical, plumbing, concrete, drywall, stucco and roofing crews. The same license that draws the unit builds it and finishes it to match the house.

Type and size set the base. A garage conversion reuses a slab, a roof and three walls; a detached cottage needs all of them new, plus a fuel modification plan and the WUI exterior package on a fire-zone lot. Utility runs are the second driver: the distance from the house to a rear-yard unit, the condition of a fifty-year-old sewer lateral, and whether a 100-amp panel can carry the load. Hillside pads add a soils report and engineered footings. Finish level moves the number more than square footage. We walk the lot, confirm the county line and the fire map, and price the unit as a written fixed-price scope.

Approvals set the schedule. HOA architectural committees meet monthly, the city Zoning Clearance needs the HOA approval attached, and the County plan check runs through EPIC-LA with virtual engineer appointments. State law as of 2026 gives each agency 15 business days to declare an application complete and 60 days after that to approve or deny it. A fuel modification plan must be approved before the building permit issues, so on a fire-zone lot we file it first. A converted garage builds in a few months; a detached cottage with a new lateral and a panel upgrade takes longer. The fixed-price scope comes with a dated schedule.

No. The City of Westlake Village publishes no pre-approved plans. Its ADU page sends owners to LA County Public Works Building & Safety, which offers Standard Notes and Details for converting a single-story garage under 1,200 sq ft or creating a JADU under 500 sq ft inside the house, with no added footprint. The County's three detached standard plans at 800 and 1,200 sq ft were written for unincorporated land, so we ask the Calabasas desk whether they are accepted on a city lot before designing around them. A detached unit here is usually custom-drawn anyway, because the code requires the exterior to match the main house.

Yes, and it is the lowest-cost path on most of these lots. Attached two-car garages are the norm in the 1960s to 1980s tracts and sit close to the electrical panel. State law waives replacement parking when a garage becomes an ADU, and a conversion keeps its existing setbacks. The County's standard notes cover a single-story garage under 1,200 sq ft with no added footprint. The work is a new front wall where the door was, insulation, a bathroom tied to the house drain, a kitchen and a separate entry. Your HOA may still weigh the lost parking, so we address it in the committee package.

Yes, with a longer checklist. A new habitable structure in the VHFHSZ needs a Fuel Modification Plan approved by LA County Fire's Forestry Division before the building permit issues, with three zones out to 200 ft or the property line, a recorded covenant and a final landscape inspection. The building itself is checked against the 2025 California Wildland-Urban Interface Code, formerly Chapter 7A: Class A roof, ember-resistant vents, ignition-resistant walls, multi-pane glazing with a tempered pane and rated doors. The city code text limits VHFHSZ lots to one ADU or one JADU; state law and HCD read that differently, and Planning will confirm what applies to your lot.

Yes, for 30 days or longer. Municipal Code 9.14.070 records a covenant on the unit barring rentals under 30 days, so a Westlake Village ADU is a long-term rental, not a vacation listing. No owner-occupancy requirement applies to a standard ADU under state law. A JADU is different: as of 2026, owner occupancy applies only to a JADU that shares a bathroom with the main house. The unit cannot be sold separately from the house, and we found no city ordinance opting into the state's ADU condominium law. Tenants here tend to come from the business park north of the 101, the Four Seasons and Las Virgenes Unified families.

No, but it can shape the design. Civil Code 4751 voids any CC&R provision that bans or unreasonably restricts an ADU or JADU on a single-family lot. Reasonable objective standards survive, and committees here review color, materials, roof form, window placement and visibility from the street or the lake. Because the city's own code requires the ADU's materials and roof pitch to match the main house, a code-compliant design is most of the way to committee approval already. The city's Zoning Clearance form asks for proof of HOA approval, so we run the association package and the city package in parallel and time the submittal to the committee's monthly meeting.

Yes, under one contract. We start with a feasibility read on the parcel: county line, fire map, hillside overlay, protected oaks, tract-specific standards, panel capacity and the sewer lateral. Design follows through our design-build practice, drawn to the city's matching rule and the HOA's guidelines at the same time. We file the HOA package, the city Zoning Clearance and the County plan check through EPIC-LA, order the fuel modification plan and any soils or arborist report, and build with our own electrical, plumbing, concrete, drywall, stucco and roofing crews. Crews dispatch from Ventura. Call (805) 667-8800 for the feasibility read.