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

Avatar for OT Bay Builders
OT Bay Builders
4.9(
128
)
Addition to Existing Structure - Build

Serving Concord, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Warranties offered

"We needed more space for our growing family, and the addition they built blends in seamlessly with our original home. From permits to the finishing touches, everything was handled professionally. It’s like it was always meant to be part of the house!"
Broadway Kitchen Remodel
Broadway Full Kitchen remodel
Broadway Full Kitchen remodel
San Francisco Contemporary Kitchen Remodel
San Francisco Contemporary Kitchen Remodel

+81

Response time12 hrs
Response rate100%
Recommended by56%of homeowners
Avatar for Zacarias Remodeling Construction
Zacarias Remodeling Construction
5.0(
33
)
Addition to Existing Structure - Build

Serving Concord, CA and surrounding areas

Approved

In business since 2009

Free estimates

Customers say: True professional

"Excellent crew. On time, very efficient, good quality work with attention to details, respectful of homeowner's time. Easy to communicate needs and changes to business owner who personally kept track of work in progress. Would not hesitate to hire again."
Remodeling - General Project
Remodeling - General Project
Remodeling - General Project
New kitchen, bedroom and bathroom
Remodeling - General Project

+50

19 neighbors recently requested a quote
Recommended by87%of homeowners
Avatar for S&L REMODELING AND DESIGN INC
S&L REMODELING AND DESIGN INC
4.9(
47
)
Addition to Existing Structure - Build

Serving Concord, CA and surrounding areas

Approved

In business since 2013

Free estimates

Offers commercial services

"This company has gone above and beyond our expectations!! My husband and I have been planning our dining room renovation for a year and spoke with Raz throughout the whole process who oversaw the the project from start to finish, accommodating our requests and slight changes throughout the renovation. The entire crew was able to work around my family and our daily routines, they were very hard working, friendly, professional, and absolutely accommodating! They listened to all our request and must haves and our dining room is gorgeous and functional! Thank you Raz, Jeckob and the staff that helped turn our ideas into reality! I wish I could put more stars to my like."
Moraga - Bathroom
Moraga - Bathroom
Moraga - Bathroom
Moraga - Bathroom
Moraga - Bathroom

+65

Response time1 day
Response rate100%
8 neighbors recently requested a quote
Avatar for Home By Tom, Inc
Home By Tom, Inc
5.0(
56
)
Addition to Existing Structure - Build

Serving Concord, CA and surrounding areas

Approved

In business since 2023

Free estimates

Offers commercial services

We're a locally owned and operated company that values honesty and integrity and treats your home or business as if it were our own. We are experts in all aspects of roofing projects and our services are customizable to each individual project. We specialize in both installations and replacements. We pride ourselves on the quality of our work as well as our commitment to outstanding results. We look forward to building lasting relationships and guarantee your satisfaction!

My projects
My projects
My projects
My projects
My projects

+48

5 neighbors recently requested a quote
Recommended by78%of homeowners
Avatar for BEAR Remodeling Inc.
BEAR Remodeling Inc.
4.8(
34
)
Addition to Existing Structure - Build

Serving Concord, 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
9 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 Concord, CA and surrounding areas

Approved

In business since 2025

Free estimates

Warranties offered

"The kitchen has become our favorite place in the house. We spend so much more time cooking, entertaining, and just being together as a family. Builders Group took our ideas and turned them into something even better than we imagined. The layout is incredibly functional, the finishes are beautiful, and the craftsmanship really stands out. The entire team was respectful, responsive, and easy to work with from day one. If you’re thinking about remodeling your kitchen, this is definitely the company to trust."
South San Francisco
South San Francisco
South San Francisco
South San Francisco
South San Francisco

+139

5 neighbors recently requested a quote
Avatar for Bay Remodeling Kitchen & Bath
Bay Remodeling Kitchen & Bath
5.0(
69
)
Addition to Existing Structure - Build

Serving Concord, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2006

Free estimates

Emergency services offered

"From the beginning to the end, working with Bay Remodeling Kitchen & Bath was enjoyable. Our home's focal point is now a bespoke island that they built when they renovated our kitchen. Their in-house staff is highly skilled and informed, and they pay unparalleled attention to detail. They produced a finished product that beyond our expectations while adhering to the timeline. Many people have complimented us on the new area. I appreciate your excellent effort."
Palo Alto full Home Remodel
Full Bathroom Remodel Mountain Veiw, CA
Portola Valley, CA
Bathroom Remodel in Palo Alto, CA
Bathroom Remodel San Jose, CA

+183

16 neighbors recently requested a quote
Recommended by67%of homeowners
Avatar for Cal Green Remodeling
Cal Green Remodeling
5.0(
18
)
Addition to Existing Structure - Build

Serving Concord, CA and surrounding areas

Approved (Corporate)

In business since 2015

Free estimates

Emergency services offered

"We hired Shay to correctly vault our home’s ceilings after they were unsafely vaulted years earlier by a licensed general contractor. Shay, their construction manager, gave us a typed, 17 page contract on the SAME DAY that he came to give us an estimate (!) The contract was highly specific, with detailed scope of work, and contained many protections for the homeowner, several which we referred to during the project. Their bid wasn’t the lowest, nor was it the highest — two came in at double and triple Shay’s estimate, one at 30% less. We were inspired by Shay’s rapidly produced and detailed contract — along with the excellent references that they gave us — to go with them, and we’re very glad that we did. They started a month AHEAD of schedule, and had reasonable progress payments as the project continued. Every step of the way their work was on time and professional, and their change orders were always necessary and reasonable. They followed the architectural and structural plans in great detail, worked well with our structural engineer, and in several instances saved us from having to rip out parts of our floor and a kitchen window through their effective negotiations with the planning office. All building inspections were passed with no difficulties, and the site was cleaned up immaculately upon completion of the project."
Outdoor Gazebo Kitchen Morgan Hill California
Outdoor Gazebo Kitchen Morgan Hill California
Outdoor Gazebo Kitchen Morgan Hill California
Outdoor Gazebo Kitchen Morgan Hill California
Outdoor Gazebo Kitchen Morgan Hill California

+51

Response time1 day
Response rate100%
11 neighbors recently requested a quote
Avatar for McCormick Home Builders, Inc.
McCormick Home Builders, Inc.
4.7(
42
)
Addition to Existing Structure - Build

Serving Concord, 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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+1

Response time6 hrs
Recommended by17%of homeowners
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FAQs for addition to existing structure building service projects in Concord, 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 Concord, 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.