Custom ADUs – Design, Permits & Construction
Licensed • Insured • Bonded • 15+ Years Experience • Design-Build Experts • Serving Southern California
Whether you’re looking to generate rental income, create a private guest house, build a home for aging parents, or add more living space to your property, a professionally designed Accessory Dwelling Unit (ADU) is one of the smartest investments you can make.
At Kol & Co., we are a licensed, insured, and bonded design-build ADU contractor serving Newport Beach and Orange County. We manage every stage of your project—from feasibility studies and architectural design to permits, engineering, and construction—so you can work with one experienced team from start to finish.
Unlike companies that only build, our design-build process keeps your project organized from the first consultation through final inspection, helping reduce delays, improve communication, and create a smoother construction experience. Schedule your consultation and let our team help you today!
Accessory Dwelling Units have become one of the fastest-growing home improvement projects in California because they offer flexibility, long-term value, and additional living space without purchasing another property.
Homeowners commonly build ADUs to:
With Newport Beach’s strong real estate market and continued demand for quality housing, a professionally designed ADU can become one of the most valuable improvements you make to your property.
An attached ADU is connected to the existing home while maintaining its own private entrance and independent living space.
They are commonly used for:
Our team carefully designs attached ADUs to integrate naturally with your home’s architecture while meeting California ADU requirements and Newport Beach building regulations.
A detached ADU is a standalone structure built separately from your main home. It’s one of the most popular options for homeowners who want maximum privacy and flexibility.
Our detached ADUs include:
Garage conversions make use of an existing structure, reducing the amount of new construction while transforming underused space into a comfortable home.
Garage conversion projects may include:
If your lot has limited backyard space, building above an existing garage can be an excellent way to create additional living space while maximizing your property’s footprint.
Above-garage ADUs are especially popular in established Newport Beach neighborhoods where preserving outdoor space is important.
These projects require careful structural engineering and thoughtful planning to ensure the existing garage can safely support the new living area.
The cost of building a custom ADU in Newport Beach typically ranges from $200,000 to $500,000, depending on the size, design, site conditions, utility connections, and level of customization.
Your investment generally includes:
Architectural design and planning
Structural engineering
Permit preparation and city approvals
Site preparation and foundation
Framing, roofing, windows, and exterior finishes
Electrical, plumbing, and HVAC installation
Insulation and drywall
Flooring, cabinetry, countertops, and tile
Interior paint, trim, and fixtures
Final inspections and project completion
Every property is unique, so we provide a customized estimate based on your lot, project goals, and design preferences. During your consultation, we’ll walk you through the expected costs and help you plan a budget that fits your vision.
Yes. Nearly every ADU project requires permits before construction can begin.
Permits help ensure your ADU complies with California building codes, structural requirements, energy standards, and local regulations.
Most ADU projects require one or more of the following:
Building Permit
Electrical Permit
Plumbing Permit
Mechanical Permit
Structural Engineering Review
Energy Compliance Documentation
Plan Review
Final Building Inspection
The exact permits required depend on your property’s existing conditions and the scope of work. As part of our design-build service, Kol & Co. manages the permitting process for you.
A well-planned ADU can save time, money, and unnecessary stress. Here are some of the most common mistakes we help homeowners avoid:
At Kol & Co., we’re committed to making the process as organized and transparent as possible.
Our service areas include Newport Beach, Corona del Mar, Newport Coast, Newport Coast, Balboa Island, Balboa Peninsula, Lido Isle, Newport Heights, Dover Shores, Eastbluff, Cliff Haven, Harbor View, Baycrest and more.
Whether you’re planning a detached ADU, garage conversion, guest house, or custom accessory dwelling unit, Kol & Co. is here to help turn your vision into reality.
Our experienced design-build team will guide you through every step—from evaluating your property and creating custom plans to obtaining permits, managing construction, and completing final inspections.
If you’re ready to increase your property’s value, create additional living space, or generate long-term rental income, we’re ready to help you get started.
Contact Kol & Co. today to schedule your consultation and receive a customized estimate for your Newport Beach ADU project.
An Accessory Dwelling Unit (ADU) is a self-contained residential living space located on the same property as a primary home. An ADU typically includes its own kitchen, bathroom, living area, and sleeping space. Common types include detached ADUs, attached ADUs, garage conversions, guest houses, and in-law suites.
Most ADU construction projects in Newport Beach take approximately 12 months, including design, architectural plans, permitting, and construction. The exact timeline may vary depending on the project’s complexity and city approvals, but planning for about one year is a realistic expectation.
Yes, ADUs typically increase property value and offer rental income potential. Newport Beach’s strong housing demand makes ADUs a smart investment for homeowners.
Yes, many homeowners rent their ADUs for long-term or short-term rentals. You must follow Newport Beach and California regulations for rental units. Kol & Co. can guide you through compliant ADU design and construction.
Yes. Garage conversions are one of the most popular ADU options in Newport Beach. Converting an existing garage into a fully functional living space can be an efficient way to add housing while making use of an existing structure. Every garage conversion is evaluated to ensure it meets current structural and building code requirements.
Absolutely. Every ADU is designed to complement your home’s architecture, exterior finishes, rooflines, windows, and overall style, creating a seamless addition that feels like it has always been part of the property.
Depending on your needs, your ADU may include:
Our design team will help create a layout that maximizes both comfort and functionality.
