ADU Builder & Home Additions in Westlake Village, CA
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Last modified: 2026-09-24T00:00:00.000Z
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Image: Open-plan living room and kitchen with polished concrete floors
- Westlake Village
Design · Permit · Build
ADUs & Additions in Westlake Village
Detached ADUs, garage conversions and additions, from plans to move-in.
Book a Consultation Call 818-300-2393
Built for Westlake Village Homes
One thing surprises owners here more than anything else: the City handles planning and design review, but building permits and inspections come from Los Angeles County, which Westlake Village contracts with for building and safety. So a backyard project moves through two separate desks.
We sequence it that way from the start (City design review first, then County plan check through EPIC-LA) and keep any HOA architectural review running alongside.
Mostly planned-development parcels: modest, well-defined rear yards in the older neighborhoods, waterfront lots with dock frontage on the island, and larger slope-backed lots along the hillside edges.
We are a design-build team, which means the people who draw your project are the people who build it. Design, engineering, permits and construction run through one project manager and our own crews, so nothing gets lost in a handoff between a salesperson and a subcontractor. We are licensed, bonded and insured, CSLB license #1119054 .
Permits in Westlake Village: The City contracts with Los Angeles County for building and safety, so plan check, permit issuance and inspections are handled by the County Department of Public Works Building and Safety Division through its Calabasas office and the EPIC-LA online system, while planning and design review stay with the City's Planning Department at City Hall.
Any permit or zoning clearance for new construction or exterior changes must meet the City's design standards (WVMC 9.15), and uses in the RPD zone need a planned development permit, although alterations to an existing single-family home are exempt (WVMC 9.6.070).
Parcels inside the Hillside Management Area must meet the City's hillside development standards, which call for preserving prominent ridgelines and minimizing grading. We also check any HOA CC&Rs for a separate architectural approval.
Permit details checked September 2026 against City of Westlake Village and Westlake Village Municipal Code . Rules change, so we confirm them again for your parcel.
What We Build
- City design review plus County plan check sequencing
- HOA architectural submittals
- Lakefront and hillside retaining design
- Detached ADUs, ground-up
- Garage conversions to living space
- Junior ADUs within the main house
- Room additions and bump-outs
- Second-story additions
- Full kitchens and bathrooms in the ADU
- Separate utility metering where required
- Private entries, patios and landscaping
- Plans, engineering and city submittals
- Title 24 energy compliance
Local Conditions
What to Know in Westlake Village
These local conditions change the scope, the schedule and the budget.
01
Lakefront parcels need a site-specific soils investigation before pool shell and retaining design.
02
Hillside Management Area parcels must preserve prominent ridgelines and minimize grading, which pushes outdoor living into stepped terraces rather than a single pad.
03
Island and cul-de-sac lots have tight street frontage, so excavation spoil, gunite and equipment access frequently require conveyor or crane staging.
04
Wildland-adjacent slopes on the southern and western edges bring defensible-space obligations directly into the landscape and hardscape plan.
Areas we serve in Westlake Village:Westlake IslandFirst NeighborhoodThree SpringsWatergateSouthshore
Investment
What It Costs in Westlake Village
Real Southern California price ranges, not teaser numbers.
Detached ADU
$150,000 to $400,000+
What moves it: square footage, finish level, utility runs, and site access; garage conversions typically run well below a ground-up detached build
Garage conversion ADU
$80,000 to $180,000
What moves it: whether the existing slab and framing meet current code, how far utilities have to run, and the finish level of the kitchen and bathroom
Plans, drawings and permit management
$4,500 to $25,000+
What moves it: project type and size, whether structural engineering, Title 24 or a soils report is required, and how many jurisdictions or review bodies are involved
Your lot, access and finishes set the price. We walk the site, then show you where every dollar goes.
Get a line-item price for your Westlake Village property
The Process
How We Work in Westlake Village
01
Feasibility
We check lot size, setbacks, utilities and access to confirm what your property will actually support.
02
Design & 3D
Layout, elevations and finishes, modeled in 3D so you approve the unit before submittal.
03
Plans & Permits
We prepare the full drawing set, handle engineering and Title 24, and manage the city submittal and corrections. In Westlake Village that submittal goes to Los Angeles County Department of Public Works, Building and Safety Division (under contract to the City of Westlake Village).
04
Foundation & Framing
Site prep, foundation, framing and dry-in by our own crews.
05
Systems & Finishes
Electrical, plumbing, HVAC, insulation, then kitchen, bath and interior finishes.
06
Final Inspection
We pass final inspection, walk the unit with you and hand over the keys.
Questions
What Westlake Village Homeowners Ask
Who issues the permits for this work in Westlake Village?
Los Angeles County Department of Public Works, Building and Safety Division (under contract to the City of Westlake Village). The City contracts with Los Angeles County for building and safety, so plan check, permit issuance and inspections are handled by the County Department of Public Works Building and Safety Division through its Calabasas office and the EPIC-LA online system, while planning and design review stay with the City's Planning Department at City Hall.
Any permit or zoning clearance for new construction or exterior changes must meet the City's design standards (WVMC 9.15), and uses in the RPD zone need a planned development permit, although alterations to an existing single-family home are exempt (WVMC 9.6.070).
Parcels inside the Hillside Management Area must meet the City's hillside development standards, which call for preserving prominent ridgelines and minimizing grading. We also check any HOA CC&Rs for a separate architectural approval. We prepare the drawings, make the submittal and handle plan-check corrections ourselves, so you are not the one chasing plan check.
What makes building in Westlake Village different?
Mostly planned-development parcels: modest, well-defined rear yards in the older neighborhoods, waterfront lots with dock frontage on the island, and larger slope-backed lots along the hillside edges. One local condition that shapes the work: Lakefront parcels need a site-specific soils investigation before pool shell and retaining design.
Which parts of Westlake Village do you work in?
All of it, including Westlake Island, First Neighborhood, Three Springs and Watergate. Our crews run every job out of our Cahuenga Pass base in Los Angeles, with our own people on site.
What does an ADU or addition cost in Westlake Village?
Detached ADU: generally $150,000 to $400,000+ across Southern California. What moves it is square footage, finish level, utility runs, and site access; garage conversions typically run well below a ground-up detached build. We give line-item pricing after seeing the site rather than quoting a number over the phone.
How long does an ADU take start to finish?
Plan a realistic year. Design and engineering typically take one to three months, city plan check and corrections add several more, and construction usually runs four to eight months depending on size and site access.
Is a garage conversion cheaper than a detached ADU?
Usually yes, and often substantially, because the foundation, walls and roof already exist. The trade-offs are that you lose the garage, and older slabs and framing sometimes need upgrading to meet current code.
Can I rent the ADU out?
California ADU law is designed to allow long-term rental, and an ADU is one of the few ways to add rentable square footage to a single-family lot. Short-term rental rules vary by city, so confirm your local ordinance before counting on that income.
Do you handle the permits?
Yes. Plans, engineering, Title 24 and the city submittal are all handled in-house, including responding to plan-check corrections. That is a service we sell on its own, so it is not something we hand off.
More Services in Westlake Village
Pool & Spa Remodeling in Westlake Village Backyard & Outdoor Living in Westlake Village Kitchen, Bath & Interior Remodeling in Westlake Village Plans, Permits & Design in Westlake Village Everything we build in Westlake Village
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Planning Guides
Before You Build in Westlake Village
Costs, materials and process notes from our own projects.
Pool Construction in Westlake Village: Lakeside Luxury Westlake Village's luxury market demands exceptional pool design. Here's what sets premium Westlake pools apart. Read guide ADU Cost Breakdown by Size in Los Angeles A detached ADU in Los Angeles runs $150,000 to $400,000-plus. Here is the real cost broken down by unit size, with the soft costs, utility work and finish decisions that move the number. Read guide Garage Conversion to ADU: The Step-by-Step Build A garage conversion runs $80,000 to $180,000 in Southern California. Here is the real sequence, from slab testing and plan check to the raised floor, the mini-split and final sign-off. Read guide ADU Rental Income Math in the San Fernando Valley A one-bedroom ADU in the San Fernando Valley rents for roughly $2,100 to $2,900 a month. Here is the honest arithmetic on payback, carrying costs and what the unit adds to the property. Read guide
Planning an ADU in Westlake Village?
Sit down with your project manager and get an accurate estimate. We call you back within one business day.
Book a Consultation 818-300-2393
Licensed, bonded & insured · CSLB license #1119054
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