About Kol & Co. — ADU Contractor Serving Orange County, West Los Angeles & North San Diego
Kol & Co. is a design-build firm with over 15 years of experience helping homeowners remodel, expand, and build on their properties. Based in Orange County, CA, they serve homeowners across West Los Angeles and North San Diego as well. Their focus includes the full scope of Accessory Dwelling Unit (ADU) projects — from initial feasibility through permitting, design, and construction.
As an established ADU contractor in the region, Kol & Co. combines local regulatory knowledge with in-house design and construction capabilities. This means clients work with a single team throughout the entire process, rather than coordinating between separate architects, designers, and builders.
For homeowners considering adding an accessory dwelling unit to their property, common questions include what's actually possible on a given lot, what the realistic costs are, and who can be trusted to manage the project properly. Kol & Co. addresses these concerns by offering transparent estimates and clear communication from the start.
Types of ADUs and Services Offered
Kol & Co. works on a range of ADU types, depending on the property and the homeowner's goals. These include:
- Detached ADU builder services — standalone units built separately from the main home
- Garage conversion contractor work — converting existing garage space into a livable unit
- Attached ADUs — units connected to the primary residence
- Junior ADU (JADU) contractor services — smaller units typically created within the existing footprint of a home
Each project type comes with its own design considerations, permitting requirements, and construction scope. Kol & Co. guides clients through these differences to help determine which option fits their lot, budget, and intended use — whether that's a granny flat, an in-law suite, a rental unit, or a backyard cottage.
Factors That Influence ADU Construction Costs
The cost of building an ADU varies based on a number of project-specific factors. Kol & Co. provides estimates tailored to each property and situation. Key cost drivers include:
- Type of ADU: Detached units, attached additions, and garage conversions each carry different design and construction requirements.
- Size and Layout: Larger or more customized floor plans require more materials and coordination.
- Site Conditions: Soil conditions, grading, utility access, and existing infrastructure can affect complexity and cost.
- Design and Finishes: Architectural details and interior finish selections influence the overall investment.
- Permitting and Local Regulations: City fees, zoning rules, and utility connection requirements vary by municipality and can affect both cost and timeline.
- Scope of Work: Converting an existing structure is generally different in scope and pricing compared to building a new detached unit from the ground up.
Kol & Co. aims to provide realistic, transparent cost guidance so homeowners can plan with a clear picture of what to expect — without unexpected surprises mid-project.
For homeowners in Orange County, West Los Angeles, or North San Diego who are exploring the possibility of adding an ADU — whether to generate rental income, accommodate a family member, or make better use of their property — Kol & Co. offers consultations and site assessments to help evaluate feasibility and outline next steps.
