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

Avatar for BEAR Remodeling Inc.
BEAR Remodeling Inc.
4.8(
34
)
Addition to Existing Structure - Build

Serving Antioch, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2017

Free estimates

Customers say: True professional

"We are so happy we chose BEAR Remodeling Inc for our kitchen! From the design to the final touches, everything was done with extra care and attention to detail. The team was friendly, professional, and always kept us updated. We would definitely recommend them to anyone planning a remodel."
Outdoor Kitchen - Clayton
Outdoor Kitchen - Clayton
Outdoor Kitchen - Clayton
Weather Safe
Outdoor Kitchen - Clayton

+127

Response time9 hrs
11 neighbors recently requested a quote
Recommended by58%of homeowners
Avatar for BUILDERS GROUP & DESIGN INC
BUILDERS GROUP & DESIGN INC
5.0(
21
)
Addition to Existing Structure - Build

Serving Antioch, CA and surrounding areas

Approved

In business since 2025

Free estimates

Warranties offered

"Our bathroom was outdated and unattractive, so we wanted to hire a professional to help with the design and get the job done right. We found Builders Group on Angie, and Mike came out to give us a quote. What set Mike apart from the others was his attention to detail and how great he was with people. We decided to hire him, and we were happy with our choice from the very beginning."
South San Francisco
South San Francisco
South San Francisco
South San Francisco
South San Francisco

+139

5 neighbors recently requested a quote
Avatar for McCormick Home Builders, Inc.
McCormick Home Builders, Inc.
4.7(
42
)
Addition to Existing Structure - Build

Serving Antioch, CA and surrounding areas

Approved

In business since 2017

Free estimates

Customers say: True professional

"We found McCormick home builders through Angie’s list. They were not one of our original contacts, but they contacted us and came out to give us a quote. Matteo was extremely helpful, informative, honest, and gave us reasonable realistic prices, and did not try to inflate the prices or pressure us in anyway. We felt very comfortable with him immediately. We felt like he was a member of the family that we could just talk to and ask questions he was very personable. He gave us his contact number in case we had other questions and he was always available when we needed him for any type of questions or concerns. Mateo‘s team did a beautiful job. They were fast. They were efficient. They cleaned up beautifully. They did a wonderful job. They were very considerate of our time our needs and our neighbors. They were an absolute pleasure to work with. I would highly recommend Matteo from McCormick home builders for any home building projects, and we will be calling him again in the future!"
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.
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+1

Response time6 hrs
Recommended by17%of homeowners
Avatar for Cerletti & Kennedy Design-Build
Cerletti & Kennedy Design-Build
4.3(
109
)
Addition to Existing Structure - Build

Serving Antioch, CA and surrounding areas

Approved

Super Service Award Winner

In business since 1987

Free estimates

Warranties offered

"Cerletti & Kennedy recently renovated our kitchen and dining area, and the end result is exceptional. In addition to relocating HVAC and water heater, our project required structural work. All of these things, as well as our daily questions and concerns, were handled by Matt and Robert et. al. with professionalism and patience."
in the beginning
 Finished!
Wish I had a good camera
 Eat in kitchen, new wood flooring, beam ceiling
 Chefs table

+45

Response time3 days
34 neighbors recently requested a quote
Recommended by76%of homeowners
Avatar for Bear Remodeling, Inc.
Bear Remodeling, Inc.
4.8(
24
)
Addition to Existing Structure - Build

Serving Antioch, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Free estimates

Customers say: Quality work

"We hired Bear Remodeling to convert our garage into an ADU for my mom to live in, and they knocked it out of the park! They handled everything. The team added proper insulation, installed new windows for natural light, and created a small but efficient kitchen area. They even finished the exterior paint to match our house perfectly. The transformation is incredible. You'd never know it used to be a garage. It took about 8 weeks from start to finish, which was actually faster than we expected. If you need more living space but don't want to move, I'd recommend their garage conversion service without hesitation."
living room remodel
Wet bar
waterfall island
gray shaker style cabinets
kitchen island

+158

Response time12 hrs
Response rate98%
34 neighbors recently requested a quote
Avatar for Hagenbach Construction
Hagenbach Construction
4.3(
19
)
Addition to Existing Structure - Build

Serving Antioch, CA and surrounding areas

Approved

In business since 1982

Free estimates

Customers say: Quality work

"The finished product is nothing short of stunning. They have some incredibly talented craftsmen, and everyone that's been by so far is absolutely speechless! We plan to have them back for future projects. Remodeling is stressful and John & Amy worked diligently to address all concerns in a timely manner. We are very happy with the addition to our home."
Living Room
Downtown Room Addition - Livermore
Pleasanton Kitchen Remodel
Casita/ADU Above Garage
Danville Kitchen Remodel

+375

Response time1 day
Recommended by93%of homeowners
Avatar for Build Atlas
Build Atlas
5.0(
13
)
Addition to Existing Structure - Build

Serving Antioch, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2008

Free estimates

Emergency services offered

"I couldn?t be happier with the roofing work completed by Build Atlas. As a first-time homeowner, I was nervous about taking on such a big project, but even from the first consultation, the team made everything so easy and stress-free. They were patient, thorough, and explained all of my options clearly without any pressure, which I appreciated. The crew showed up exactly when they said they would, kept the site clean, and finished ahead of schedule. Not only does my new roof look amazing, but I feel confident knowing it?s going to last. I?ve already recommended them to a few friends."
Updated Tile Flooring
Updated Vanity & Fixtures
Added Shelving & Accessories
Newly updated kitchen
Outdated Kitchen

+19

Response time5 hrs
Recommended by76%of homeowners
Avatar for McBride's Building and Restoration
McBride's Building and Restoration
4.0(
4
)
Addition to Existing Structure - Build

Serving Antioch, CA and surrounding areas

Approved

In business since 2024

Credit card accepted

Offers commercial services

At McBride's Building and Restoration, we bring craftsmanship to a whole new level, redefining excellence in every project we undertake. With over 15 years of hands-on trade experience and more than 100 years of knowledge handed down from generations of master craftsmen, owner-driven expertise ensures every detail is executed to perfection. Our families legacy of quality craftsmanship gives you the peace of mind that your project will be completed with the precision, care, and artistry you deserve. Discover what "Craftsmanship Redefined" truly means with McBride's Building and Restoration, where tradition meets innovation, and your satisfaction is our foundation.

Project Photos
4 neighbors recently requested a quote
Avatar for JB Home Solutions
JB Home Solutions
5.0(
2
)
Addition to Existing Structure - Build

Serving Antioch, CA and surrounding areas

Approved

In business since 2000

Emergency services offered

Customers say: Quick response

"He Explain the process during the Complete remodel, any changes needed it was communicated prior to any changes, Remodel Included all doors & windows & floors installation. Very clean & detail with all trim work. I would definitely use this Company again. Excellent Work Ethics."
Recommended by100%of homeowners
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FAQs for addition to existing structure building service projects in Antioch, 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 Antioch, 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.