From Property Evaluation and ADU Design to Engineering, Permits, Utility Planning & Complete Construction—We Manage Your ADU Project From Start to Finish.
Licensed • Insured • Bonded • 15+ Years Experience • Design-Build Experts • Serving Southern California
Adding an ADU in Aliso Viejo starts with determining what your property can realistically accommodate.
Is there enough usable yard area for a detached ADU? Would an attached unit make better use of the lot? Is there an existing garage or part of the home that could be converted? Where will the new unit connect to utilities, and what will the project require for access, setbacks, grading, and construction?
Kol & Co. provides full-service ADU construction in Aliso Viejo, including property evaluation, design, engineering, permitting, site work, utilities, construction, kitchens, bathrooms, finishes, inspections, and final completion.
We are a licensed, insured, and bonded design-build contractor with 15+ years of experience, giving homeowners one team to coordinate the project from the initial feasibility questions through the finished living space.
We serve Glenwood, Westridge, Pacific Ridge, California Summit, Canyon Vistas, Talavera, and surrounding Aliso Viejo communities.
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A realistic planning range for the complete ADU projects we typically build is:
$200,000–$500,000+
The budget depends on much more than the ADU’s square footage.
Important cost factors include ADU type, site access, grading, foundation conditions, utility connections, structural requirements, kitchen and bathroom specifications, windows and doors, and the overall level of finish.
An ADU may be smaller than the primary home, but it still contains most of the same major building systems.
For new construction, the work can include:
Site conditions can have a significant impact here. Building on a straightforward, accessible area is different from building where additional grading, drainage, or difficult access needs to be addressed.
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A completed ADU needs the systems required to function independently as a residence.
Depending on the project, we coordinate:
The location and capacity of existing utilities should be evaluated early because they can influence both the ADU location and construction cost.
Learn MoreInside the ADU, we can coordinate:
With a smaller floor plan, details such as cabinet depth, door swings, storage, furniture placement, and circulation become especially important.
Learn MoreDepending on the project, exterior work may include:
The finished ADU should work with the rest of the property—not feel like a building that was simply fitted into the remaining yard.
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The exact requirements depend on the property and ADU type, but key Aliso Viejo standards include:
Because several standards change based on ADU type, existing structures, lot conditions, and the applicable approval pathway, we verify the allowable size, setbacks, height, parking, and building requirements for the individual property before developing the plans.
For the full project, homeowners should generally plan for approximately:
12 Months
That includes:
Property Evaluation → Design → Engineering → Permitting → Pre-Construction → Construction → Inspections → Completion
The actual timeline depends on the design, City review, engineering, site conditions, utilities, material lead times, and complexity of construction.
The City’s permit-review timeline is only one part of the overall schedule. Planning, engineering, corrections, pre-construction, and the actual build all need to be accounted for.
Yes.
Aliso Viejo’s current ADU regulations provide different approval pathways depending on the type of ADU being proposed.
Depending on the project, permit documents can include:
Site plan
Floor plans
Building elevations
Structural plans
Structural calculations
Energy documentation
Utility information
Project-specific construction details
Other required supporting documents
Kol & Co. coordinates the applicable design, engineering, permit documentation, construction, required inspections, and final completion.
We start by evaluating the Aliso Viejo property, including the existing home, lot configuration, possible ADU location, access, utilities, and the type of unit you're considering.
We develop the ADU around the property and intended use, including the floor plan, kitchen, bathroom, bedrooms, storage, windows, doors, exterior design, and other project details.
We coordinate the applicable structural engineering, energy documentation, plans, City submittal, corrections, and permit process.
Once approved, we coordinate the applicable site work, foundation, framing, roofing, plumbing, electrical, HVAC, insulation, drywall, cabinetry, countertops, tile, flooring, fixtures, finishes, and required inspections.
After construction and applicable final inspections, we complete the remaining details and final walkthrough.
We work with homeowners throughout Aliso Viejo, including Glenwood, Westridge, Pacific Ridge, California Summit, Canyon Vistas, Talavera, and surrounding communities.
A successful ADU starts with understanding the property—where the unit can fit, how large it can be, how utilities will reach it, and what will be required to get it approved and built.
Kol & Co. coordinats your Aliso Viejo ADU from property evaluation and design through engineering, permitting, construction, inspections, and final completion.
Many residential properties can accommodate an ADU. The appropriate size, type, and location depend on the existing home, lot configuration, setbacks, site conditions, and applicable City standards.
Under Aliso Viejo’s locally regulated standards, an ADU can generally be up to 850 sq. ft. for a studio or one-bedroom unit and 1,000 sq. ft. for a unit with two or more bedrooms. Separate state-law ADU provisions can apply to certain projects.
Do not assume that 1,200 square feet is available simply because that number appears in general California ADU information.
Aliso Viejo’s current locally regulated standards generally establish 850 sq. ft. for a studio or one-bedroom ADU and 1,000 sq. ft. for an ADU with two or more bedrooms. Other state-law pathways have their own standards, so the allowable size should be confirmed for the specific property and ADU type.
A practical planning range for the complete ADU projects we typically take on is approximately $200,000–$500,000+, depending on the ADU type, site conditions, utilities, structural work, size, and finishes.
Yes. We can coordinate the applicable design, engineering, permits, construction, inspections, and final completion.
