Custom ADU Design and Construction in Anaheim for Detached ADUs, Garage Conversions, and Attached Units—with One Design-Build Team Managing Plans, Engineering, Permits, Construction, and Inspections.
Licensed • Insured • Bonded • 15+ Years Experience • Design-Build Experts • Serving Southern California
Thinking about building an ADU in Anaheim but not sure what will actually work on your property? That’s where we recommend starting—not with a floor plan, but with the property itself.
Kol & Co. is a licensed, insured, and bonded design-build contractor with 15+ years of construction experience. We handle the entire ADU process under one team, from evaluating your property and planning the right type of ADU to architectural design, engineering, permitting, construction, inspections, and final completion.
We build detached backyard ADUs, garage conversion ADUs, attached ADUs, and custom accessory dwelling units throughout Anaheim Hills, West Anaheim, East Anaheim, Downtown Anaheim, The Colony, Platinum Triangle, and surrounding Anaheim neighborhoods.
Whether you’re creating a separate home for family, planning a rental, converting an underused garage, or simply making better use of your property, we’ll help you understand what’s possible before you commit to the project. Schedule Your In-Home ADU Consultation Today!
For the full ADU projects we typically take on, homeowners should generally plan for approximately:
$200,000–$500,000+
The final investment depends heavily on the project itself, including:
Every project is different, but an ADU Construction may include:
Before construction starts, we need to make sure the ADU works with your Anaheim property—not just on paper.
We coordinate the planning and technical work needed to move the project toward construction, which may include:
Learn More
For a new detached or attached ADU, we're building an actual residence from the ground up. That means the structure and exterior need the same attention as the space you'll eventually see inside.
Depending on the project, construction may include:
One of the biggest parts of ADU planning happens behind the walls. We determine how the new unit will connect to the property and what existing systems may need to be extended or upgraded.
Work may include:
Once the structure and building systems are in place, we complete the ADU as a functional living space—not just an empty shell.
Depending on your design and selections, this may include:
Anaheim allows ADUs in a range of sizes, but the maximum depends on whether the unit is detached, attached, or a Junior ADU (JADU).
The maximum allowed size isn’t necessarily the best size for every property. We look at the existing home, available yard space, access, utilities, setbacks, and how you plan to use the ADU before recommending a footprint.
For many new ADUs in Anaheim, the key number is 4 feet.
Anaheim’s current development standards generally provide:
Before we start designing, we look at the actual property and available building area so the ADU is planned around what can realistically be permitted and built—not just what appears to fit in the backyard.
An ADU must meet current building, structural, energy, and safety requirements. Depending on the property and design, we may need to evaluate:
We review these conditions early because they can affect where the ADU can be built, how it should be designed, the construction cost, and the overall project timeline.
For planning purposes, we generally tell homeowners to allow approximately 12 months for the complete ADU process, including design, engineering, permitting, construction, inspections, and completion.
The actual schedule depends on project complexity, corrections during plan review, site conditions, utility work, material selections, and the type of ADU being built.
Anaheim offers its own ADU Express program for qualifying single-family properties. According to the City, eligible projects can complete the ADU review process in approximately 1–3 days. Anaheim also provides information about pre-approved ADU plans and its standard ADU review process.
Not every property or design will qualify, so we first determine which permitting path makes sense for the ADU you’re planning.
We visit your Anaheim property, discuss what you're trying to build, and look at the existing site conditions.
We evaluate the proposed ADU location, approximate size, configuration, utilities, access, and major construction considerations.
Our team develops the plans and coordinates the documents needed for Anaheim review and permitting.
Once permits are ready, we manage construction from site preparation and foundation through framing, utilities, interiors, and finishes.
We coordinate required inspections and take the ADU through final completion.
We work with homeowners throughout Anaheim Hills, West Anaheim, East Anaheim, Downtown Anaheim, The Colony, Platinum Triangle, Anaheim Resort-area neighborhoods, and surrounding residential communities, as well as nearby cities including Fullerton, Garden Grove, Orange, and Santa Ana.
You don’t need to have the floor plan figured out before contacting us. If you’re considering a backyard ADU, garage conversion, attached unit, or another configuration, we’ll start by looking at your Anaheim property and talking through what you want the space to accomplish.
We’ll help you understand what may fit, what the project will involve, the likely budget range, and what needs to happen before construction can begin.
For the full ADU projects we typically take on, homeowners should generally plan for approximately $200,000–$500,000+, depending on size, ADU type, site conditions, utilities, structural work, and finish selections.
Plan on approximately 12 months for the overall process, including design, engineering, permits, construction, inspections, and completion. Complex projects can take longer.
Many residential properties can accommodate an ADU, but the appropriate size, location, and type depend on the property and proposed project. We evaluate these conditions before developing the plans.
Potentially. We evaluate the garage’s existing foundation, framing, utilities, ceiling height, access, and layout to determine what work would be required for a permitted conversion.
Not necessarily. The appropriate setup depends on the project and existing utility capacity. We evaluate electrical, sewer, water, gas, and HVAC requirements during planning.
