Design-build ADU construction in Coto de Caza, from property evaluation and ADU design to engineering, permits, utilities, construction, inspections, and completion.
Licensed • Insured • Bonded • 15+ Years Experience • Design-Build Experts • Serving Southern California
Coto de Caza includes a mix of larger residential lots, custom homes, established single-family neighborhoods, and other residential properties. For homeowners with usable space, an ADU can create additional living area without giving up the existing home.
Depending on the property and your goals, that could mean a detached backyard ADU, garage conversion, attached ADU, or another configuration allowed for the site.
But having space on the property doesn’t automatically mean every ADU design will work.
Before designing the unit, it’s important to understand the lot, existing structures, setbacks, access, utilities, sewer, grading, applicable development standards, and any property-specific requirements that could affect construction.
Kol & Co. provides full-service ADU design and construction in Coto de Caza, coordinating the project from initial feasibility and design through engineering, permits, construction, inspections, and completion.
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Many residential properties may qualify for an Accessory Dwelling Unit (ADU), but what you can build depends on the individual site.
Before recommending an ADU design, we look at factors such as:
A large lot does not necessarily mean the entire lot is buildable.
That is why we start with a site feasibility review, not a standard floor plan.
A complete ADU involves much more than building a small structure in the backyard.
Depending on the project, this may include:
Construction may include:
The unit may require:
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The finished ADU may include:
We can handle these components as one project from planning through completion.
Learn MoreOur typical ADU project may range from approximately $200,000–$500,000+, depending on the size, property, construction type, site conditions, utilities, and finish level.
Major cost factors include ADU size, detached vs. conversion, existing site conditions, construction access, excavation and grading, foundation requirements, utility distances, sewer connection, structural engineering, kitchen and bathroom scope, windows and doors, HVAC, cabinetry, flooring and tile, exterior materials, and interior finishes.
For planning purposes, homeowners should expect approximately:
12 months from planning through completion
Construction itself is only part of the timeline.
The schedule can change based on the ADU type, design complexity, County review, corrections, site work, utilities, material lead times, inspections, and property-specific conditions.
Coto de Caza falls under Orange County’s ADU regulations. Requirements vary by property and ADU type, but key standards include:
Because Coto de Caza properties vary considerably, the individual lot should be evaluated before choosing an ADU size, location, or floor plan.
We evaluate your lot, existing structures, setbacks, access, utilities, and site conditions to determine what type of ADU may work.
We develop the layout, size, placement, and design around your property, goals, and budget.
We coordinate required plans, engineering, documentation, and Orange County permit review before construction begins.
Our team handles site work, foundation, framing, roofing, plumbing, electrical, HVAC, interiors, kitchens, bathrooms, and finishes.
We coordinate required inspections, complete the finishing details, and take the project through final approval and walkthrough.
We work with homeowners throughout Coto de Caza and nearby South Orange County communities, including Rancho Santa Margarita, Trabuco Canyon, Ladera Ranch, Mission Viejo, San Juan Capistrano, Laguna Niguel, Lake Forest, and surrounding areas.
You don’t need to have the floor plan figured out before contacting us.
If you’re trying to determine whether an ADU will fit, how large it can be, where it should go, what utilities will be required, or what the project may cost, that’s a good place to start.
Kol & Co. can evaluate your property and help you plan the project from initial feasibility through design, permits, construction, inspections, and completion.
Many residential properties may qualify for an ADU, but what you can build depends on the individual property. Lot configuration, existing structures, setbacks, utilities, easements, grading, access, and applicable development standards all need to be reviewed first.
The maximum size depends on the property, ADU type, and the development standards that apply. Because different ADU pathways can have different size limits, the safest approach is to confirm the allowable size during a property feasibility review before finalizing the design.
A 4-foot side and rear setback applies to many new ADUs, but existing structures, conversions, lot conditions, and the specific ADU type can affect the final requirement. We verify the property before establishing the ADU footprint.
A typical planning range is approximately $200,000–$500,000+. Cost depends on ADU size, site access, grading, foundation work, utilities, sewer connection, engineering, kitchen and bathroom scope, finishes, and overall construction complexity.
Yes. Orange County offers pre-approved ADU plans that may help streamline portions of the plan-review process. Site-specific documents, property information, and applicable development requirements are still required before construction can begin.
Yes. Kol & Co. handles ADU design, architectural plans, structural engineering, calculations, and other required project documentation.
Yes. We handle the applicable permit documentation, plan-check process, construction inspections, and project completion through Orange County.
Yes. Kol & Co. provides full-service ADU design-build construction, including feasibility, design, engineering, permits, site work, foundation, framing, utilities, interiors, kitchens, bathrooms, finishes, inspections, and completion.
