Cal ADU Builders Inc. is a licensed, family-owned ADU contractor in Westminster, CA, with 20+ years of experience. They offer custom ADU design, full construction, and consultation for Southern California homeowners.

Cal ADU Builders Inc. – ADU Contractor in Westminster, CA

About Cal ADU Builders Inc.

About Cal ADU Builders Inc.

Cal ADU Builders Inc. is a licensed, family-owned ADU contractor based in Westminster, California, with over 20 years of experience in residential construction. The company focuses on accessory dwelling unit construction, helping homeowners add functional living space to their properties through a structured and transparent process.

As an established ADU builder, Cal ADU Builders Inc. works with clients from the initial design phase all the way through to completed construction. Their approach is built around clear communication, reliable timelines, and attention to detail at each stage of the project.

Services Offered

Cal ADU Builders Inc. provides a range of services centered on accessory dwelling unit construction. Their core offerings include:

  1. Custom ADU Design: Before any construction begins, the team develops detailed 3D plans tailored to the client's property and preferences. These visuals help homeowners understand exactly what their finished ADU will look like.
  2. ADU Construction: The company handles the full build process, drawing on two decades of residential construction experience to deliver completed projects on schedule.
  3. Consultation: As a family-owned business, Cal ADU Builders Inc. offers guidance throughout the entire process, from early planning to project completion.

Whether a homeowner is looking to add a detached ADU, a backyard cottage, or another type of accessory dwelling unit, the company aims to provide a straightforward building experience backed by their licensing and construction background.

Design-First Approach

One of the distinguishing aspects of Cal ADU Builders Inc. is their emphasis on the design phase. Every project starts with a 3D plan that is specifically tailored to the layout and style of the client's existing property. This step is intended to give homeowners a clear picture of the finished space before any work begins, reducing uncertainty and helping to align expectations early in the process.

The company is licensed through the California State Contractor Board and operates out of Westminster, CA. Their office hours run Monday through Friday, 8am to 5pm, and they serve clients looking for a reliable accessory dwelling unit builder in the Southern California area.

For homeowners considering adding an ADU to their property, Cal ADU Builders Inc. offers a combination of design services, construction expertise, and hands-on consultation rooted in over 20 years of residential building experience.

Services

Cal ADU Builders Inc. performs the following services

  • Architecture & Design
  • Construction
  • 3D renderings & floor plans

Cal ADU Builders Inc. Reviews

Diana Styles

2025-12-11
"Prior to the completion of this ADU unit specifically built for my in-laws, the team's enthusiasm for incorporating accessibility features won us over. The designer of the company preemptively asked us if we were incorporating aging-in-place features, even before we brought them up. Instead of merely suggesting a roll-in-shower, they preemptively thought of the rest of the bathrooms layout and designed it in such a way that it could be wheelchair-accessible in the future; even incorporating blocking in the walls for grab bars, a sink that has clearance for wheelchair users, and walls that do not go lower in height than 32'' for accessibility purposes. They were always advocating for 36'' doors to be used throughout, and for there to be a zero-step entry from the patio to the rest of the home. The crew also entertained my father-in-law as he visited the site and was too animated, explaining everything to him in detail, involving him to motivate him. The space is beautifully designed, and a safe, long-term home that will support them for the coming decades. The company definitely cares for the long-term human use of their buildings and is not solely concerned with the short-term construction. They have genuinely designed with the family of their clients in mind and for that we are forever grateful."

alexa b

2025-10-24
"Im not usually the type to leave reviews. Honestly, who has the time? But hey, here I am. After my husband passed away last year, the house felt way too big and way too empty. Plus, the bills, dont even get me started. My daughter kept suggesting about building an ADU so I could rent out the main place. At first, I was just overwhelmed. Renovations? Decisions? No thanks. But the folks at ADU Builders California were actually incredible. I mean, Dave basically adopted me. The man has the patience of a saint, he walked me through every single choice, even when I lost my mind and swapped out the flooring THREE times. And when all those loan docs started looking like ancient Greek, Dave literally sat next to me and my banker for TWO hours until it all made sense. Fast forward, and now Im chilling in my own little 1-bedroom thats just right, and the rent from the main house pays for everything. Seriously, these people gave me my life back. If youre on the fence, just call them."

Aby Rothschild

2025-10-07
"I live near mountains with a beautiful view and needed a legal rental unit on my property for extra income. ADU Builders California clearly explained the costs and timelines. I appreciated their honesty about things I shouldnt skimp on, like waterproofing and windows. The inspections went well, and I received weekly updates with photos. Within a month of finishing, I had a tenant move in. The rental income has already made a big difference for me."

Bbb Kyot

2025-10-02
"We considered moving to a bigger house, but prices are crazy. Instead, we added an ADU in the backyard for extra space. The company explained everything clearly, from budget to inspections. I appreciated that they didnt pressure us into upgrades we didnt need. We chose mid-range finishes, and the place still looks modern. Our teenage son already moved his desk in and calls it his apartment, though we plan to use it for family visits."

Jalya Javadova

2025-05-26
"My husband and I had been researching getting into real estate investing for quite some time, but the state of housing prices in California made it seem completely out of reach to buy a second home. We even considered tapping into equity in our current home to use as a down payment, but upon crunching the numbers, it simply wasn't working out especially if we were borrowing 100 on the new home. That's when we started exploring the option of building an ADU as an alternative. After conducting much research, we found ADU Builders California and were pleased to see that they offered a no-money-down solution. That was precisely what we needed. From the very first day, the process was totally seamless. Their team arrived on time, were professional, and went above and beyond to minimize the disruption. Each day, they cleaned up after themselves, so we could still enjoy our backyard without it feeling like a full-scale construction zone. They even helped us install a fence to give us and the ADU a bit of extra privacy, a little touch that was the biggest difference.; All in all, it was a really positive experience. If youre thinking about building an ADU and want a reliable, professional team that works fast and takes care of the details, Id definitely recommend giving ADU Builders California a call."

Specifics

Licensed 20 years in business Free Consultation

Opening hours

Monday 8:00AM - 8:00PM
Tuesday 8:00AM - 8:00PM
Wednesday 8:00AM - 8:00PM
Thursday 8:00AM - 8:00PM
Friday 8:00AM - 8:00PM
Saturday 8:00AM - 8:00PM
Sunday 8:00AM - 8:00PM

Location

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