ADU Builders & Home Addition Contractors in Westlake Village, CA
Westlake Village projects need two approvals: a city Zoning Clearance, then a building permit from LA County Building and Safety.
Building ADUs and additions in Westlake Village
Quick answer: In Westlake Village, the city's Planning Department issues a Zoning Clearance first, and residential applications must include proof of HOA approval. The building permit then comes from LA County Building and Safety, which the city currently contracts with. ADUs are approved administratively through the Zoning Clearance under Municipal Code Section 9.14.070.
Westlake Village is an incorporated city in Los Angeles County. Its Planning Department reviews zoning, and the city currently contracts with LA County Building and Safety for plan check, building permits and inspections. That split means two approvals for most projects: a city Zoning Clearance, then a County building permit.
The Zoning Clearance is the city's administrative approval that a project complies with its Zoning Ordinance. Residential applications must upload proof of homeowner association approval and specify exterior materials, colors, windows and doors. ADUs are approved administratively through the same process, with standards in Municipal Code Section 9.14.070.
Two more local rules come up often. Oaks with a trunk wider than four inches and designated heritage trees need a Protected Tree Permit backed by an ISA-certified arborist's report. And six neighborhoods carry conditions of approval from their original subdivision maps that supersede conflicting code standards.
Westlake Village permitting — city Zoning Clearance, County building permit
Start by confirming the parcel is inside city limits: the city notes that some addresses with a Westlake Village mailing address are not. For a city parcel, the Planning Department must approve a Zoning Clearance before any building permit is issued, and residential applicants upload proof of HOA approval with the application.
Plan check and building permits are then handled by LA County Building and Safety through the EPIC-LA portal and its Calabasas office, under the city's current contract with the County. The city is reviewing that arrangement, so we confirm the current submittal path for each project. Parcels in a Very High Fire Hazard Severity Zone also need a fuel modification plan approved by the LA County Fire Department.
- Westlake Village Zoning Clearances Planning Department approval required before a building permit; residential projects include HOA approval.
- Westlake Village ADUs ADUs approved administratively through Zoning Clearance; standards in Municipal Code 9.14.070.
- Westlake Village Building & Safety The city contracts with LA County Building and Safety for plan check and permits.
- Westlake Village Protected Tree Permits Oaks over 4 in. in diameter and heritage trees; an ISA-certified arborist report is required.
- Residential Development & Design Standards R-1 and RPD standards plus neighborhood conditions of approval.
- LA County EPIC-LA County portal used for Westlake Village building permit applications.
- California HCD ADU Handbook State-level ADU baseline that every California city and county must permit at minimum.
Local rules, fees, and site conditions change and vary by parcel. Always confirm current requirements with the reviewing department for your address — this page is general information, not legal or code advice.
Site conditions that affect Westlake Village projects
- A city Zoning Clearance before LA County will issue the building permit.
- HOA approval documentation uploaded with the residential Zoning Clearance application.
- Protected Tree Permits and an ISA-certified arborist report where oaks over 4 inches or heritage trees are affected.
- Neighborhood conditions of approval that supersede conflicting code standards.
- A fuel modification plan approved by LA County Fire for parcels in a Very High Fire Hazard Severity Zone.
- Confirming the parcel is inside city limits, since some Westlake Village mailing addresses are not.
What we build most often in Westlake Village
Westlake Village neighborhoods we cover
Neighborhoods listed describe our coverage area, not project addresses.
Budgeting your Westlake Village ADU or addition
Every number we publish is a preliminary planning range, not a quote. Cost in Westlake Village moves with unit size, design complexity, site conditions, utility work, jurisdictional requirements, and finish level. Use our cost estimator to build a starting range, then we produce a detailed construction proposal after feasibility and design work is complete.
Westlake Village ADU questions, answered
Does Westlake Village or LA County issue building permits for an ADU or addition?+
Both are involved. The city's Planning Department first issues a Zoning Clearance, which is also the administrative approval for an ADU. The building permit then comes from LA County Building and Safety, which the city currently contracts with for building and safety services.
Do I need HOA approval before applying in Westlake Village?+
Yes, where an HOA covers the property. The city requires residential Zoning Clearance applications to include proof of homeowner association approval, along with the exterior materials, colors, windows and doors for the project.
Are oak trees protected in Westlake Village?+
Yes. Oaks with a trunk diameter greater than four inches, measured 4.5 feet above the ground, and designated heritage trees of any size are protected. Affecting one requires a Protected Tree Permit with a report from an ISA-certified arborist.
Is my Westlake Village address inside city limits?+
Not always. The city notes that some addresses with a Westlake Village mailing address are outside city limits, so confirm the parcel first. The reviewing agency, and therefore the whole permit path, depends on it.
Nearby areas we build in
Further reading
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Everything you need to plan an ADU, garage conversion, or addition on a property in Westlake Village.