What is an ADU in Whittier, CA?

An ADU (Accessory Dwelling Unit) is a secondary living space built on a residential property, such as a backyard home, garage conversion, or guest house.

Do I need a permit to build an ADU in Whittier, CA?

Yes, ADU construction requires city permits and approvals. Our team handles all permits and ensures full compliance with California building codes.

How much does ADU construction cost in Whittier, CA?

ADU costs vary based on size, design, and materials, typically ranging from $120,000 to $350,000+. We provide free detailed estimates.

How long does it take to build an ADU?

Most ADU projects take 4–8 months for construction, depending on design complexity, permits, and site conditions.

Is building an ADU a good investment?

Yes, ADUs increase property value, generate rental income, and provide additional living space for family or guests.

Are you a licensed ADU construction company in California?

Yes, we are a fully licensed and insured ADU construction company serving Whittier, CA and surrounding areas.

Do you offer free ADU construction estimates?

Yes, we provide 100% free consultations and detailed estimates for all ADU construction projects with no obligation.

ADU Construction Services

Looking for professional ADU construction in Southern California? We are a trusted ADU builder near me providing complete design and build solutions for homeowners who want to add value, space, and rental income to their property.

Professional ADU Construction Services

We provide professional ADU construction services, helping homeowners expand their living space while increasing long-term property value. As a trusted ADU construction company, we specialize in custom accessory dwelling units that meet California building codes, local zoning regulations, and energy efficiency standards. Our experienced ADU construction contractors manage every stage of the ADU construction process, from initial planning and design to permits and final construction. Whether you need a rental unit, guest house, in-law suite, or backyard home office, we deliver durable, functional, and modern ADU solutions tailored to your property.

Affordable ADU Builder for Every Budget

If you’re looking for an experienced ADU builder, we provide affordable and reliable ADU construction services designed around your goals and budget. As a trusted ADU construction company, we know that ADU cost per square foot and overall ADU construction cost are top concerns for homeowners planning a build. That’s why we offer free ADU consultations, transparent pricing, and cost-effective construction methods without cutting corners on quality. Whether you need a garage conversion ADU, a detached ADU, an attached ADU, or a junior ADU (JADU), our team designs and builds custom accessory dwelling units that maximize usable square footage and long-term property value.

ADU Design and Build Services

Our ADU design and build services provide a complete turnkey solution for homeowners seeking a stress-free construction experience. As a professional Accessory Dwelling Unit contractor and experienced ADU construction company, we manage every phase of the ADU construction process, including architectural design, structural engineering, permit approvals, site preparation, and final construction. We create custom ADU floor plans based on your property size, lifestyle, and investment goals while ensuring full compliance with local building codes and California ADU regulations. Whether you’re building a detached ADU, attached ADU, garage conversion ADU, or a junior ADU (JADU) for rental income, our team delivers energy-efficient, modern, and functional living spaces.

Turnkey ADU Design and Build Services

Our ADU design and build services provide homeowners with a complete, all-in-one construction solution from concept to completion. Our experienced ADU construction contractors handle everything design consultations, permit approvals, structural engineering, foundation work, framing, electrical, plumbing, and interior finishing so you never have to coordinate multiple trades on your own. Every accessory dwelling unit is custom-designed to maximize usable square footage, energy efficiency, and long-term functionality, whether you’re planning a detached ADU, attached ADU, garage conversion ADU, or junior ADU (JADU).

Backyard ADU Construction

We specialize in backyard ADU construction helping homeowners transform unused outdoor space into beautiful and functional living areas. Backyard ADUs are an excellent solution for multigenerational living, rental income, home offices, or guest accommodations while significantly increasing property value. As experienced ADU construction contractors, we oversee the complete ADU construction process, including site preparation, foundation installation, framing, roofing, plumbing, electrical work, insulation, and interior finishes. Every unit is carefully designed to complement your existing home while maximizing usable space and energy efficiency.

Get Free ADU Construction Estimate

Ready to build your ADU? Contact Team Champion Home Services today for a free consultation and estimate. Whether you’re looking for reliable ADU construction, a complete design-build solution, or a custom-built accessory dwelling unit, our team is ready to create a functional, attractive, and valuable living space tailored to your needs, your property, and your budget

Why Choose Our Team Champion Home Services

Homeowners choose Team Champion Home Services for reliable, high-quality ADU construction. As a licensed and insured contractor, we handle garage conversions, detached and attached ADUs, JADUs, and custom backyard units. From design and permits to construction and final inspection, we manage every step with transparent pricing and quality workmanship.

We offer:

Licensed & insured ADU services
Free, transparent estimates
Energy-efficient, quality materials
Complete project management
On-time, code-compliant construction

      
   Team Champion Home Services
   15 Google reviews 
  Write a review 
  
 
 
   
 
 
       Posted on Google  
   
   Charles Greener 
 
 
 
 Trustindex verifies that the original source of the review is Google. I want to personally recommend this licensed General Contractor, David Cardenas with Team Champion Home Services.
David recently completed a 15,000 square foot commercial building for our property management company in La Habra. The property was originally in very poor condition, and David successfully transformed it into a clean, updated premises. He is very knowledgeable and easy to work with and completed the project both on time and on budget.
If you have any upcoming projects whether it's for a Home or Commercial, I highly recommend reaching out to him.
  
 
      Posted on Google  
   
   Aaron Zober 
 
 
 
 Trustindex verifies that the original source of the review is Google. If you’re looking for any new construction on your home or renovation, I strongly recommend Team Champion Home Services. For reasonable prices, they offer quality service. I especially love their attention to detail. I had them construct a new garage, patio, and patio cover. I’m very pleased with how all of it looks.

Update: I was very pleased with the work they did on my garage and patio cover, that I've since hired them for more renovations. I needed a new retaining front wall and had them do the job. I'm extremely happy with how it turned out. It's the first people see when passing by my house, so important to have this done well. I know I made the right choice for a contractor.
  
 
      Posted on Google  
   
   Michael Amira 
 
 
 
 Trustindex verifies that the original source of the review is Google. Team Champions Home Services and their crew have pleased me over and above my expectations. Not only in the work they perform, but also their attention to detail. They are in communication with me all the way through the job to its finish.
David Cardenas has been wonderful to work with.
He is honest and forthright in his business dealings. I definitely will use Team Champions again, and I give them my 100% endorsement.
Mike Amira
  
 
      Posted on Google  
   
   Peter Chaniotakis 
 
 
 
 Trustindex verifies that the original source of the review is Google. They did a great job on our bathroom and kitchen. We are very happy with the work!
  
 
      Posted on Google  
   
   Mark Liv 
 
 
 
 Trustindex verifies that the original source of the review is Google. I would highly recommend David and his Team Champion Home Services team for any home project!

I was building a Detached ADU from the ground up and had gotten multiple bids and was very glad I went with David.

Once I had gotten my approved, original plans from my architect, I needed some supplemental plans that were outside of my original architect's field of expertise. David was there to handle technical communications with my original architect and his team picked right up to get my project the extra plans drafted and approved.

Any home project of any size inherently will come with some anxiety and stress. David understands this and expels this anxiety and stress  as he is great at explaining all processes and educating along the way. Not once during construction did I ever question whether or not did I get the wrong contractor for my project. This does not mean that my project never had any hiccups or unforeseen issues that needed to be addressed, because it did (and I honestly believe you should steer clear of anyone who promises you that they can carry out a project as big as this without mistakes). But whenever something did arise, David and his team would take the time to discuss what was going on and propose a solution. There was never any blaming, excuses or uncomfortable encounters. He is the most honest person in the line of general contracting work that I've dealt with and he will take ownership of problems and mistakes.

Communication and speed were great and price was very amazingly reasonable.  From start to finish, the ADU took about 9 months, but the actual build time by his contracting team for a 510 square foot detached ADU was only 4-5 months before all work that was under the responsibility of his team was completed.  The rest of the time was waiting for other services like the electrical, gas and solar companies to come out to handle their parts. His team could have been done even quicker than 4-5 months, but as I mentioned before we had to juggle around supplemental plans that were missing.

In addition to a brand-new build, Team Champion Home Services was also commissioned to replace my roof of my primary residence, upgraded my electrical panel and installed a residential sump pump- everything of which was quick but also great quality work.

If you need something done for your home, go with David and Team Champion Home Services. You won't regret what you get and you won't regret the great experience.
  
 
      Posted on Google  
   
   Enrique Vasquez 
 
 
 
 Trustindex verifies that the original source of the review is Google. You can always count on TEAM CHAMPIONS to deliver quality work on time. Their team is professional, dependable, and truly gets the job done right
  
 
      Posted on Google  
   
   Scott Clarkson 
 
 
 
 Trustindex verifies that the original source of the review is Google. Team was on time and easy to work with. Very clean and considerate of my home. No hesitation to use again.
  
 
      Posted on Google  
   
   Jon Codispoti 
 
 
 
 Trustindex verifies that the original source of the review is Google. I started a painting and front porch area rejuvenation project that turned into a whole house re-stucco when i found i had failing stucco and termite damage all over. I had already sand blasted the whole house when I realized i was in over my head organizing all the needed trades to fix my house correctly. I hired Team Champion Home Services to take over everything for me as my general contractor instead. David and team did a wonderful job fixing my termite damage, redoing all my stucco with the latest acrylic product and mesh to prevent future cracks, re-painting all the wood siding and trim, and performing modifications to my front porch roof overhang and the side garage wall to clean them up and modernize my home's style some and improve overall curb appeal. His team was friendly and professional and did a good job cleaning up each day of the project. I'd highly recommend David and Team Champion Home Services for any job you have, large or small. They are pros in home construction and repair projects!
  
 
      Posted on Google  
   
   Sean Healy 
 
 
 
 Trustindex verifies that the original source of the review is Google. I have been working with Team Champion for years. They are very responsive, get the job done, and do well every time! He is my go-to personally, and for other ventures I am in.
  
 
      Posted on Google  
   
   Yolla Elkhoueiry 
 
 
 
 Trustindex verifies that the original source of the review is Google. David and his team are great!! Knowledgeable, professional, fast and reliable, most importantly to me is that David is always available to answer questions or solve problems.

Our Projects

Frequently Asked Questions

Do I need a contractor to build an ADU?

It’s not always legally required, but hiring a licensed ADU construction contractor is strongly recommended to ensure code compliance, proper permits, and a smooth construction process.

What are the common mistakes when building an ADU?

Common mistakes include underestimating ADU construction cost, skipping permits, poor floor plan choices, hiring unlicensed contractors, and not planning utility connections early.

How much does it cost to build a 1,200 sq ft ADU in California?

Costs vary by design, materials, and site conditions, with larger detached ADUs falling on the higher end of ADU cost per square foot. A free ADU estimate gives the most accurate pricing for your property.

What is the most expensive part of building an ADU?

Foundation work, utility connections, and permitting/engineering fees are typically the biggest cost drivers, especially on lots with difficult site conditions.

What types of ADUs do you build?

We build detached ADUs, garage conversion ADUs, attached ADUs, and custom backyard ADUs based on your property needs.

What is the cheapest option for an ADU?

Yes, garage conversion ADUs are one of the most popular and cost-effective ways to add living space and rental income.

Do you provide ADU design and build services?

A garage conversion ADU is usually the most affordable option, followed by junior ADUs (JADUs), since both use existing structures and require fewer new utility connections.