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Top-Rated Addition to existing structure builders in Fullerton - Updated Nov 2026

Avatar for HA My Design, Inc.
HA My Design, Inc.
5.0(
379
)
Addition to Existing Structure - Build

Serving Fullerton, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2011

Free estimates

Customers say: True professional

"H&A MY Design made building our garage an effortless and enjoyable process! From the moment we walked into their incredible 5,000-square-foot showroom, we knew we were in the right hands. The showroom truly is a one-stop shop where we could explore construction materials, finishes, and design ideas all in one place. The team helped us narrow down options that fit both our vision and budget. Their professionalism, attention to detail, and seamless communication were second to none. The construction crew was respectful and clean, completing the job on time without any hassle. I wouldn’t hesitate to recommend them for any home improvement project."
After
Kitchen Remodel+Fireplace
Complete Home Renovation
Complete Kitchen Remodel
Complete Kitchen Remodel

+526

Response time1 day
Response rate100%
Recommended by92%of homeowners
Avatar for So Cal Builders & Design Inc
So Cal Builders & Design Inc
4.6(
311
)
Addition to Existing Structure - Build

Serving Fullerton, CA and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 1982

Free estimates

Warranties offered

"Our initial meeting with Suj was great. Initially, we had in mind a much larger job. He had quoted us $3000 for the closet demolition / wall rebuild (non-load bearing), packaged with several other items. Together with the fee for drawings ($4000) and permits, this was a bit higher than we anticipated. However, we decided to go with Suj due to his responsiveness and professionalism. Out of our other quotes, Suj’s pricing was middle of the pack - not the cheapest or most expensive. When the drawings were complete and evaluated, he gave us an updated cost of $6000 over text message. The scope of work had changed, and this was no longer part of a bigger project - understandable. The issue was when he gave us the official estimate a week later and up’d the price once again to $9000. When asked what happened, his exact words were “well, I need to get paid too”. He had weeks to consider before quoting the $6000 and nothing had changed since then. The extra $3000 may be insignificant compared to most renovation costs, but for us in our first home, this was back breaking. We continued with Suj since we were already locked in and well past the 3 day cancellation period. Their work for the most part was exceptional. The new wall blended perfectly into our existing structure, and the ceiling patch was also well done. The problem here was the floor. They had dug up a 1” deep pit in the floor, likely to remove the wall studs. However, they did not patch the floor or even let us know this was going to be an issue. We were never told about the pit until I decided to check in on their progress one day towards the end of the wall build. This required us to pay a handyman to come in next day on a weekend to patch the concrete since we had cabinets being installed the following Tuesday. Suj was aware of this and did not believe it pertinent information. Overall, Suj and SoCal Builders do quality work, but the issues in pricing consistency lost us before the work even started. Not even telling us that we’d be left with a 1” deep pit in our floor after was another huge issue which should’ve been brought up much earlier. This was our first experience with a contractor and I’m not sure if this is typical or not. However, it’s enough to make me doubt I’d contact them for any future work."
Completely renovating both the guest and master bathrooms. In the master bathroom, we're installing a spacious walk-in shower featuring dual black-finished shower heads, elegant floating benches, and marble wall tiles. Meanwhile, the guest bathroom will have a sleek built-in tub and stylish hexagon tiles.
This project involved adding a new master bathroom to the existing house. The shower features sleek white subway tiles complemented by striking black fixtures and shower door hardware. The bathroom floor is adorned with elegant white marble tiles, providing a seamless and luxurious finish. A white shaker vanity topped with a white marble countertop completes the space, creating a clean and sophisticated look.
Experience a whole new level of indoor-outdoor living with the Torres Residence Backyard Remodel. This project highlights the addition of a kitchen sliding door, seamlessly merging your interior and exterior spaces
We remodeled the current kitchen, incorporating the addition of a new sliding door to establish a seamless indoor-outdoor living area
New pool with Baja bench and spa. New pavers, aluminum patio cover and built-in BBQ in the backyard

+563

35 neighbors recently requested a quote
Recommended by83%of homeowners
Kyle Beym Home Improvement
4.4(
419
)
Addition to Existing Structure - Build

Serving Fullerton, CA and surrounding areas

Approved

In business since 2008

Free estimates

Emergency services offered

"I hired Kyle for a $14,000 home remodeling project based on reviews from Angie's List and Yelp, and overall, I am satisfied with the work Kyle and his team performed and I feel like I got my money's worth. Below are my thoughts: 1. Timeliness: Kyle's crew showed up on time every day and stuck to the schedule. The entire project stayed mostly on track. Things were slightly delayed due to city inspection, but that was a factor beyond Kyle's control. So definitely an A there. 2. Quality of work - I had three major projects in this remodeling, and below are my thoughts on them: a. Conversion of a bedroom into a mudroom/entry room to garage: For some reason this new house I bought did not have an access door from garage directly into the house, so I hired Kyle to remedy this by turning a bedroom that shares a common wall with the garage into a mud room with an access door. Job involved cutting the wall open and installing a fire rated entry door, as well as removing old wall paper and repainting the room. This job was done very well and definitely an A there. b. Bathroom remodeling: I also had Kyle remove an old bathtub & tile surround and replace it with a new jacuzzi tub, new tiles and an updated tub door. We also had the toilet repositioned as well. Final quality of work was very nicely done and we were very pleased with how the new tiles turned out. Regrettably, the new bath tub got a small 1" size scratch on one of the rim and I had to touch up paint it afterwards. So A-/B+ there due to my new tub getting scratched up during tile installation. c. House electrical upgrade: I had Kyle and his crew installing an 100 amp subpanel with 2x 50 amp outlets in the garage for EV charging. I also had multiple new outlets installed throughout the house. All the newly installed outlets worked very well and I am pleased with the results. However, after all the electrical work were done, three of my outlets in the house lost power due to a "open neutral". To make a long story short, Kyle's crew tried to trouble shoot it for the better part of a day but couldn't figure out what caused it. All the worker could say is that he doesn't think it was caused by their work. As this happened at the very end of the entire remodeling project and I was uncertain whose fault it was, I ended up just letting it go. Subsequently I did more troubleshooting on my own and after several hours of trial-and-error testing using a multimeter, I found a loose neutral wire in a bathroom switch box Kyle's crew worked on. The loose neutral wire was covered up by a bunch of other wire and wire nuts in the switch box. Once that wire was reconnected, the three dead outlets became functional again. My guess is that the wire got shaken loose when Kyle's crew swap out the switches in that box with new light and fan switches, and no one realized it because that wire was buried behind other wires. I can understand how Kyle's worker missed it while trying to trouble shoot this issue. However, I'm still a bit miffed that I end up having to fix this problem myself. Thus, while the newly installed outlets are great, I am not too thrilled with the fact that his worker knocked a wire loose while changing out bathroom switches and couldn't fix the problem. So on this part of the project, I would give Kyle's team an A on the new outlets and C for causing collateral damage on my other outlets that I had to fix myself. 3. Conclusion - other than the problems with the loose neutral wire and the scratch to the new tub noted above, everything else went smoothly. Thus, in light of the scope of this remodeling project, I decided that these two issues are minor and don't detract too much from the overall success. Thus, I ended up giving Kyle and his crew an A- overall."
Additional Photos
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+18

Response time11 hrs
Response rate100%
Recommended by94%of homeowners
Avatar for YB Builders Group Inc.
YB Builders Group Inc.
5.0(
14
)
Addition to Existing Structure - Build

Serving Fullerton, CA and surrounding areas

Approved

In business since 2025

Free estimates

Credit card accepted

"We hired Ben to remodel our living room and kitchen, which included adding approximately 300 square feet, creating an open floor plan, and removing an enormous brick fireplace in the center of our house. From day one, Ben was amazing to work with. He was on budget, on schedule, professional throughout the entire project, and consistently anticipated potential issues before they became problems. His wealth of experience was incredibly valuable when it came to making decisions along the way, and he was always willing to offer thoughtful advice and guidance. His entire team was fantastic as well: professional, respectful, and clearly committed to doing quality work. We couldn’t be happier with the results and our experience working with Ben. We highly recommend Ben for any remodeling, building, or construction project!"
Bathroom Remodel
Master bathroom
Master bathroom
Master bedroom
Kitchen Remodel

+74

41 neighbors recently requested a quote
Avatar for Skyline Konstruction
Skyline Konstruction
4.9(
11
)
Addition to Existing Structure - Build

Serving Fullerton, CA and surrounding areas

Approved

In business since 2016

Free estimates

Warranties offered

"Skyline construction did an excellent job. Juan Munoz was a great contractor. We wanted to build an ADU but didn’t know who to trust. The workers were neat and careful. Every worker treated us with respect and we’re very friendly. I would highly recommend them to any of my friends or family."
Restroom
Home remodel
Laundry
Home remodel
Laundry

+93

Response time2 days
Response rate100%
8 neighbors recently requested a quote
Avatar for NEW LIFE CONSTRUCTION
NEW LIFE CONSTRUCTION
5.0(
5
)
Addition to Existing Structure - Build

Serving Fullerton, CA and surrounding areas

Approved

In business since 2010

Free estimates

Emergency services offered

"They were very professional and prompt in getting back to us. They were very detailed oriented. He got the job done on time and they did a very good job. He had a good ethics, and he was very trustworthy. They were easy to work with and had a good design."
Powder room remodel
Powder room remodel
Powder room remodel
Powder room remodel
Powder room remodel

+7

Response time2 days
1 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for McCormick Home Builders, Inc.
McCormick Home Builders, Inc.
4.7(
42
)
Addition to Existing Structure - Build

Serving Fullerton, CA and surrounding areas

Approved

In business since 2017

Free estimates

Customers say: True professional

"Our kitchen remodel exceeded our expectations, providing us with a beautiful and highly efficient space for cooking and gathering. We're thrilled with the results, as the new design seamlessly integrates style and functionality."
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+1

Response time6 hrs
Recommended by17%of homeowners
Avatar for AMERICAN PROFESSIONAL BUILDER'S INC
AMERICAN PROFESSIONAL BUILDER'S INC
5.0(
19
)
Addition to Existing Structure - Build

Serving Fullerton, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Emergency services offered

"We recently completed our home construction project with this company, and the entire experience exceeded our expectations from start to finish. Building a house can be stressful, but their professionalism, transparency, and dedication made the process smooth and enjoyable. From the initial consultation through the final walkthrough, their team demonstrated exceptional craftsmanship and attention to detail. They took the time to understand our vision, offered practical suggestions, and kept us informed at every stage of the build. The project was completed on schedule and within the agreed budget, with no surprises along the way. The quality of work truly stands out. The finishes are flawless, the structure feels solid and well-built, and every detail reflects their commitment to excellence. The crew was respectful, punctual, and maintained a clean and organized job site throughout the construction. We highly recommend this construction company to anyone looking to build their home."
Finished outdoor patio remodel.
Finished outdoor patio remodel.
Finished concrete patio.
Finished outdoor canopy.
Finished outdoor patio remodel.

+39

Response time5 hrs
Response rate99%
15 neighbors recently requested a quote
Avatar for Jorcast Enterprises, Inc.
Jorcast Enterprises, Inc.
4.7(
13
)
Addition to Existing Structure - Build

Serving Fullerton, CA and surrounding areas

Approved

In business since 1988

Free estimates

Credit card accepted

"My wife and I could not be happier with our master bedroom addition and new Walk in Closet. Jorge and the A-Right crew were the most responsive contractors I have ever worked with and in my opinion that made the entire process less stressful and much easier. I will definitely be referring A-Right builders to all friends and family who are interested in having any type of remodeling done and I am already in the process to utilize them to retile the rest of my home. Thank you Jorge & Andy"
Kitchen Remodel
Accent wall
Response time2 days
Recommended by90%of homeowners
Newland Construction, Inc.
4.2(
21
)
Addition to Existing Structure - Build

Serving Fullerton, CA and surrounding areas

Approved

In business since 1982

Free estimates

Warranties offered

"I cant explain enough, just how wonderful of an experience we had with Newland. The professionalism and patience that we received throughout the entire process gave us the assurance and value that we hoped we would get from such a demanding job. Our home and family were treated with respect, our ideas were welcomed and now the quality of our home life is forever changed for the better. We began meeting with contractors to see what could be done so that our home could better suit our needs. We met with two other contractors before we met Terry with Newland. After our initial consultation with Terry we knew that Newland would be the company that would help us to make our home dreams a reality. We now have exactly what we wanted in an addition and our home is comfortable and beautiful. Our family of six is now happy and peaceful, and we aren t cramped and crowded for space anymore! The new master bathroom is so stunning and spacious that weve actually spent a significant amount of time in there just visiting with guests when we are showing off the remodel. We have well designed storage spaces, and our staircase fits beautifully in the downstairs space it took up. If we have any home-improvement needs in the future, we will absolutely go with Newland again!"
 Day Residence - Fullerton
Before
 FINAL
Front
 Front

+36

Response time1 day
Response rate86%
Recommended by93%of homeowners
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FAQs for addition to existing structure building service projects in Fullerton, CA

You can typically raise your roof by four to eight feet, depending on your home's structure and roof design. The exact amount depends on factors like roof slope and framing support. Raising the roof creates additional interior space, enhances natural light, and increases your home's value. Consult a professional to determine the feasible height increase for your home.

Yes, you need a building permit to raise your roof. Obtaining a building permit ensures your project complies with local building codes and safety regulations. A professional contractor can assist with the permit and inspection process and ensure all legal and safety requirements are met. Your contractor will be familiar with building codes in your area, which can differ between cities or states.

While it's possible to raise a flat roof, it requires extensive structural modifications. Flat roofs lack the attic space and support structures of pitched roofs, so raising them involves significant engineering to ensure safety and durability. This process can be complex and costly, so professional assessment is essential before undertaking a project of this magnitude.

The Fullerton, CA homeowners’ guide to addition to existing structure building services

From average costs to expert advice, get all the answers you need to get your job done.