ADU Construction Westlake Village | 4 Seasons Remodeling & Design

ADU Construction Westlake Village

Premier Guest Houses. Elevate Your Investment.

4 Seasons Remodeling & Design specializes in luxury ADU construction Westlake Village homeowners trust to add livable square footage and lasting value to their estates.

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Brand Philosophy | 4 Seasons Remodeling & Design

The 4 Seasons ADU Standard

The Standard for ADU Construction Westlake Village Estates Demand.

A true guest house is not an afterthought—it is a fully realized architectural extension of the primary home, engineered with the same materials, craftsmanship, and attention to detail as the estate itself.

Our approach to ADU construction Westlake Village is defined by a commitment to structural integrity and luxury design, ensuring your new space feels intentional, seamless, and undeniably permanent.

View our luxury ADU gallery or learn about California ADU laws.

"We don't build additions. We build destinations."

— Jacob Harael

Investment Case | 4 Seasons Remodeling & Design

ADU Construction Westlake Village

Estate Investment: Property Value Elevated.

01.

State Legislation

SB 9 and modernized CA laws have streamlined ADU permitting, making it faster and more cost-effective than ever before.

02.

Equity Growth

A luxury guest house typically yields a 20–30% increase in appraised value, offering a significant return on capital.

03.

Passive Revenue

Demand for executive rentals remains high. Premier ADU construction Westlake Village projects command top-tier monthly rates.

04.

Legacy Living

Create a private residence for family that maintains the dignity and privacy of your primary estate.

Luxury ADU Types | Westlake Village

Guest House Construction Westlake Village

Every Property Is Different.
Every Solution Is Custom.

Detached Residence

The ultimate in estate privacy. A standalone residence designed to complement your main home’s architecture.

Attached guest house construction Westlake Village

Attached Addition

Sophisticated expansions that share a wall while maintaining total independence and private entry.

Garage to guest house construction Westlake Village

Garage Conversion

Premier guest house construction Westlake Village projects often involve transforming existing footprints into high-end living spaces.

Interior guest house construction Westlake Village junior unit

Junior Suite (JADU)

Boutique-style living carved from your home’s existing footprint. Minimal impact with maximum luxury.

The Guest House Experience | 4 Seasons Remodeling & Design

Accessory Dwelling Unit Conejo Valley

Engineered for Independence. Finished for Luxury.

Private Entry & Curb Appeal

Our accessory dwelling unit Conejo Valley designs maintain architectural cohesion with your main estate, ensuring your guest house enhances the property's visual identity.

Full Kitchen & Living

Self-contained culinary and living spaces finished to the same high-end standard as your primary residence.

Spa-Level Bath

Luxury bathroom finishes including stone tile, floating vanities, and premium fixture suites.

Smart Home Integration

Independent climate control, app-controlled lighting, and dedicated security systems for total autonomy.

Materiality & Craftsmanship | 4 Seasons Remodeling & Design

ADU Builder Thousand Oaks

Every Surface. Every Finish. Uncompromised.

Luxury backyard guest house Calabasas exterior materials

Architectural Exterior

Specializing in backyard guest house Calabasas builds, we use Class A fire-rated stucco and fiber cement siding selected for beauty and strict local compliance.

Interior Flooring

Wide-plank white oak hardwood, large-format stone, and heated porcelain tile systems installed with precision.

Kitchen & Bath Suites

Curated fixture suites from Kohler, Brizo, and Waterworks paired with stone countertops and custom cabinetry.

Custom Millwork

As a premier ADU builder Thousand Oaks homeowners trust, we provide bespoke cabinetry crafted to match your estate's architectural language.

The Permit & Build Process | 4 Seasons Remodeling & Design

The Pathway to Perfection

A Process Engineered for Absolute Certainty.

Phase 01

Site Assessment & Feasibility

We evaluate your lot size, zoning, and utility connections to determine the optimal ADU configuration tailored to your specific parcel.

Phase 02

Architectural Design

High-fidelity plans and 3D elevations prepared by our in-house team, specifically curated for the Westlake Village aesthetic.

Phase 03

Permit Management

We navigate the city bureaucracy, handling structural stamps and plan check revisions to achieve permit issuance with surgical efficiency.

Phase 04

White-Glove Build

Master craftsmen execute every phase of construction with an obsession for detail and a pristine, organized job site.

Phase 05

Final Handover

Final city sign-off and a comprehensive system orientation, ensuring your new luxury space is ready for immediate enjoyment.

Notable ADU Projects | 4 Seasons Remodeling & Design

Case Study 01

The Lake Sherwood Casita

A fully detached luxury guest house featuring an open-plan living area, a complete gourmet kitchen, a spa-level bath with steam shower, and independent smart home systems. Finished to match the main estate's Mediterranean architectural language.

View Project Details →

Case Study 02

The North Ranch Garage Conversion

A 3-car garage transformed into a sophisticated 1-bedroom ADU with polished concrete floors, custom built-in cabinetry, a Calacatta quartz kitchen, and a luxury walk-in shower. Permitted and completed in under 6 months.

View Project Details →

The ADU Investment | 4 Seasons Remodeling & Design

Your Return

An ADU Is Not a Cost. It Is a Capital Decision.

20–30% Property Value Increase

$2.8k–$4.5k Est. Monthly Rental Income

6–9 Mo Permit to Occupancy

Clients typically utilize HELOCs or cash-out refinancing to fund construction while keeping liquid assets available. These capital structures allow the increase in property value to far exceed the total cost of financing.

From SB 9 compliance to Westlake Village zoning, the legal landscape is complex. 4 Seasons handles the entire lifecycle—architectural stamps and city permitting—completely in-house for absolute project certainty.

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Client Testimonials | 4 Seasons Remodeling & Design

Trusted by Westlake Village Homeowners

Their Words. Our Legacy.

“

We never imagined our backyard could house something this beautiful. The Lake Sherwood casita is indistinguishable from a luxury boutique hotel suite.

Patricia M. Lake Sherwood

“

The permitting process was something we dreaded, but 4 Seasons handled every submission and revision. We never made a single city hall call.

Robert & Linda K. North Ranch

“

Our garage conversion exceeded every expectation. It now generates $3,800 per month in rental income and looks like it was always part of the original home.

Thomas A. Westlake Village

ADU FAQs | 4 Seasons Remodeling & Design

Common Questions

Everything You Need to Know Before You Build.

ADU construction in Westlake Village typically ranges from $280,000 to $650,000+ depending on size, type, and finish level. Detached guest houses with luxury finishes represent the higher end of that range.

Most single-family residential lots in Westlake Village are eligible for at least one ADU under California state law. Our feasibility assessment will confirm your specific lot's eligibility, setbacks, and maximum square footage.

From initial design to Certificate of Occupancy, the typical timeline is 9 to 14 months. Garage conversions and JADUs can move faster at 5 to 8 months.

Yes. All ADUs require building permits. 4 Seasons manages the entire permitting process in-house, including architectural plans, structural engineering, and all city correspondence.

In California, adding an ADU triggers a reassessment only on the new structure, not the entire property. Your existing home's assessed value remains unchanged.

Short-term rental regulations vary by city. Westlake Village has specific guidelines. We recommend consulting with a local real estate attorney, and we are happy to connect you with trusted local advisors.

Begin Your Transformation

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Our design team specializes in engineering high-end wellness environments. Share your vision with us, and we will contact you within 24 hours.