Build Smart. Build Beautiful. Build Your ADU.
If you’re a homeowner looking for an attached ADU builder in Orange County, CA you can trust, you’ve just found the team that consistently delivers exceptional results, on time, on budget, and with unmatched craftsmanship.
At Kol & Co., we specialize in beautifully designed Attached Accessory Dwelling Units (ADUs) that expand your living space, increase property value, and give you real options — whether that’s rental income, space for family, or simply a personal retreat.
We’re licensed, insured, and bonded, and we know Orange County zoning, permitting, and ADU construction regulations like the back of our hands, so you don’t have to stress about the hardest parts of your project. Call us today to book a consultation!
What makes us different?
An attached ADU connects directly to your primary residence, which means structural precision, seamless integration, and expert planning are critical. That’s where we shine.
What’s Included:
Every property in Orange County is different, lot sizes, zoning rules, HOA guidelines, coastal overlays. We design attached ADUs that respect regulations while maximizing livable space and ROI.
Included in Our Planning Process:
We don’t do cookie-cutter plans. Your ADU should feel like it was always meant to be part of your home — not an afterthought.
California ADU laws are favorable, but each Orange County city (Irvine, Anaheim, Huntington Beach, Santa Ana, Newport Beach, etc.) has its own nuances.
We stay current on:
We’ve navigated OC planning departments countless times — and that experience saves our clients time, money, and stress.
Because sometimes it’s the finishing touches that make all the difference.
If you’re considering building an Attached ADU in Orange County, one of the first questions you probably have is:
“What’s this realistically going to cost me — and how long will it take?”
That’s a smart place to start.
The honest answer? It depends.
The truth is, every attached ADU is different. Because it connects directly to your existing home, pricing and scheduling depend on structural integration, design choices, city requirements, and how customized you want the space to be.
At Kol & Co., we don’t believe in generic online estimates or cookie-cutter answers. We evaluate your specific property, your goals, and your local city regulations to provide a detailed, personalized plan — so you know exactly what to expect before construction begins.
Project timelines vary based on design complexity, city permitting processes, and inspection scheduling. Each Orange County city has its own review procedures, and we plan accordingly to keep your build moving efficiently.
We proudly serve homeowners throughout Orange County such as Irvine, Newport Beach, Costa Mesa, Tustin, Mission Viejo, Laguna Beach, Anaheim & Anaheim Hills, Huntington Beach, Santa Ana and more.
Building an attached ADU in Orange County is a big decision — but it shouldn’t feel overwhelming.
At Kol & Co., we make the process simple, transparent, and personalized to your property and your goals. Call us at (949) 799-3668 or contact us now for a free estimate. Let’s sit down, review your property, and create a realistic plan that fits your budget and timeline.
An attached ADU is built as an extension of your existing home or shares at least one wall with the primary residence. It has its own entrance, kitchen, bathroom, and living space, but remains structurally connected.
A detached ADU, on the other hand, is a completely separate structure in the backyard. Attached ADUs are often a great option when you want to expand your current footprint while maximizing existing utilities.
Yes. All attached ADUs in Orange County require proper building permits and city approval. This includes plan checks, structural review, energy compliance (Title 24), and inspections.
At Kol & Co., we handle the entire permitting process, from architectural plans to final sign-off, so you don’t have to navigate city departments alone.
Setback requirements vary by city and zoning designation. California state law allows certain reduced setbacks for ADUs, but local overlays and lot conditions can affect what’s possible.
We review your parcel details and city code before finalizing any design plans.
