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

Avatar for OC Home Builders, Inc.
OC Home Builders, Inc.
4.9(
118
)
Addition to Existing Structure - Build

Serving Seal Beach, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2004

Free estimates

Warranties offered

"OC Home Builders remodeled the interior of our home (kitchen, two bathrooms, one laundry room, structural upgrades, fire place) and everyone on their team worked incredibly hard to complete our project. They worked great with city inspectors and have great relationships with them. America and Jim were available whenever we had questions and always gave great value for their work. They were willing to work with other contractors and be flexible to adjust to our schedule. Their entire team takes a lot of pride in their work and they want to make their clients happy. We would definitely recommend to others."
Additional Photos
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+28

Response time11 hrs
Response rate100%
2 neighbors recently requested a quote
Avatar for HA My Design, Inc.
HA My Design, Inc.
5.0(
379
)
Addition to Existing Structure - Build

Serving Seal Beach, 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 Seal Beach, CA and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 1982

Free estimates

Warranties offered

"Ultimately the work performed was high quality. When there were small finish issues, the team came back and fixed everything to ensure continuity with our existing home design. The timeline overran a bit, but the workmanship was great"
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
Avatar for Creative Home Remodeling Group Inc.
Creative Home Remodeling Group Inc.
4.7(
257
)
Addition to Existing Structure - Build

Serving Seal Beach, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2003

Free estimates

Warranties offered

"My husband and I really enjoyed working with Ben and his team at Creative Home Remodeling Group. Ben oversaw everything from making the plans, getting them approved by the city, scheduling the entire build and doing all final inspections. We really appreciate how communicative Ben was with what day and a time window we could expect the different work groups to come and what work would be done those days. If my husband or I ever had questions or problems with anything that was going on during our construction we were encouraged to call Ben and he helped create a solution that was workable for all of us. We liked that Ben and his team took care of everything from beginning to end and we did not have to hire any additional contractors along the way. We did have to purchase the specific fixtures and tiling we wanted.) We added apx 200 sq feet to our home, which included a bathroom, walk-in closet and room extension. The total process took exactly 1 year from signing our contract to us being able to use our added rooms. (That included making the plans, getting them approved by the city, the build, the installation and final walkthrough with the city inspector.) I would recommend using Ben and his team at Creative Home Remodeling Group to my family and friends. We look forward to working with Ben again in the future."
Complete Kitchen with White and Blue Cabinets
Complete Kitchen Modern Kitchen With Botcher Island
posses of the kitchen remodeling
Modern ADU, large space with studio and 1 bathroom, big windows
White Kitchen Cabinets

+427

Response time1 day
Response rate100%
8 neighbors recently requested a quote
Avatar for HIC Builders, Inc.
HIC Builders, Inc.
5.0(
12
)
Addition to Existing Structure - Build

Serving Seal Beach, CA and surrounding areas

Approved

In business since 2017

Free estimates

Warranties offered

"HIC builders is a family owned company, and they did a terrific job at my house. We added an ADU above the garage, remodeled two bathrooms, and did other extensive work on the house. Abraham, the field manager, was responsive and available, flexible when plans needed to change to accommodate structural issues that we discover as the project progressed, and answered my endless questions. The workmen were always on time, courteous, and cleaned up the site every day before they left. Probably the easiest way to find out if HIC can provide what you want is to call Abraham Moryossef directly (818 850 5062) and chat. I know it will be a good investment of your time. They are terrific!"
Roof & exterior paint
Working on the gas line
Artificial turf project
Roof & exterior paint
Roof & exterior paint

+53

Response time2 days
Response rate100%
6 neighbors recently requested a quote
Kyle Beym Home Improvement
4.4(
419
)
Addition to Existing Structure - Build

Serving Seal Beach, CA and surrounding areas

Approved

In business since 2008

Free estimates

Emergency services offered

"Kyle and his team are great people. Kyle is sincere, kind and knowledgeable in his field. His people came to work every day, never missed. They were on time, and the renovation was delivered as scheduled or earlier. The best thing about this company that they worked at my house until the job was finished. They worked from Monday thru Saturday, approx. 8-10 hours per day. The crew are all experienced, polite, and listened well as work progressed. The cost was reasonable, right on our planned budget. Thanks to Kyle and his men. Thanks to all the hard work, the clean up, the easy, laugh, and fun to talk to guys....the stress of going thru the renovation is now my enjoyment of the new bathroom (conversion from tub to standing shower), and amazing new kitchen. My next project with Kyle will be my new floor. Im looking forward to meeting Kyle and his team again at any time. Definitely Kyle and his company are the one to go to when come to Home Improvement."
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 Seal Beach, CA and surrounding areas

Approved

In business since 2025

Free estimates

Credit card accepted

"Ben helped us convert our VERY old garage (80+ years) into a modern multipurpose room. He was communicative throughout the process, friendly to work with, and the final product exceeded our expectations. We highly recommend YB Builders to anyone looking for a contractor."
Bathroom Remodel
Master bathroom
Master bathroom
Master bedroom
Kitchen Remodel

+74

41 neighbors recently requested a quote
Avatar for Platinum Home Builders & Design, Inc.
Platinum Home Builders & Design, Inc.
5.0(
75
)
Addition to Existing Structure - Build

Serving Seal Beach, CA and surrounding areas

Approved

In business since 2020

Free estimates

Warranties offered

"I recently used Platinum Builders for a new home addition and had a very positive experience. As an engineer with extensive experience building and renovating homes, I originally planned to manage the project myself and subcontract each phase. However, with frequent work and travel, I realized I needed a turnkey solution. Devon, my project manager, was professional, honest, responsive, and worked around my schedule. Although two other quotes were substantially lower, I chose Platinum because of my confidence in their team. The footing and framing crews were excellent. When quality issues arose during finishing, Devon quickly addressed them. I would definitely choose Platinum Builders again."
DRIP EDGE FLASHINGS
SURE NAIL TECHNOLOGY SHINGLE BY OWEN'S CORNING
TITANIUM UDL 50 UNDERLAYMENT
INSTALLATION OF NEW COOL ROOF SHINGLES
SYNTHETIC ROOFING UNDERLAYMENT

+80

Response time11 hrs
Response rate93%
Recommended by88%of homeowners
Avatar for Mark Lewis & Son Construction
Mark Lewis & Son Construction
4.3(
29
)
Addition to Existing Structure - Build

Serving Seal Beach, CA and surrounding areas

Approved

In business since 1984

Free estimates

Customers say: True professional

"To hire a contractor who started out in the Plumbing business could not have been a better choice for a bathroom remodel. Everything went wonderfully. They knew the law so I was able to do things correctly. They had ideas that even I did not have, having dreamed about this for a few years. The contractors son, who was also a licensed contractor was the main person on the job and here every day. I would HIGHLY recommend them. The price was fair and competitive."
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Response time10 hrs
Response rate100%
Recommended by100%of homeowners
Avatar for RG Construction
RG Construction
5.0(
22
)
Addition to Existing Structure - Build

Serving Seal Beach, CA and surrounding areas

Approved

In business since 2022

Free estimates

Warranties offered

"We had a great experience with RG Construction! They built our ADU and were fast, professional, and easy to work with throughout the entire process. Their pricing was very reasonable, and we are extremely happy with how everything turned out. We would definitely recommend them to anyone looking for quality work at a fair price!"
Construction Showcase
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Construction Showcase

+12

46 neighbors recently requested a quote
Recommended by9%of homeowners
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FAQs for addition to existing structure building service projects in Seal Beach, 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 Seal Beach, 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.