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

Avatar for Skytech Builders
Skytech Builders
5.0(
21
)
Addition to Existing Structure - Build

Serving Fremont, CA and surrounding areas

Approved

In business since 2013

Free estimates

Warranties offered

"After I contacted several contractors on a room addition I decided to go with Sky Tech Builders and I can tell that it was a really easy decision because they gave me great offer and they completely understood what I wanted to do. They were also available on acceptable time and project started soon after we signed a contract. The project manager and his crew were professional, honest, helpful and very respectful to me and my home. They finished project within time they promised and within my budget. And final outcome is excellent, I am fully satisfied with everything they did and would definitely work with Sky Tech Builders again!"
Master Bathroom Remodel in San Jose.
Kitchen Remodel in San Mateo
Kitchen remodeling in Fremont
Master Bathroom Remodel in San Jose.
Kitchen Remodel in San Mateo

+63

Response time1 day
Response rate100%
14 neighbors recently requested a quote
Avatar for OT Bay Builders
OT Bay Builders
4.9(
122
)
Addition to Existing Structure - Build

Serving Fremont, 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 by60%of homeowners
Avatar for BEAR Remodeling Inc.
BEAR Remodeling Inc.
4.8(
34
)
Addition to Existing Structure - Build

Serving Fremont, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2017

Free estimates

Customers say: True professional

"Bear Remodeling did an amazing job on my bathroom remodel. The team was nice, courteous and worked hard to get what I wanted. They paid attention to every detail and made sure the design matched my idea. They also did some interior painting and made the whole room look cohesive and stylish. I was so impressed I asked about adding a room to my house and they gave me some great ideas. If you need a contractor for any remodeling project, call Bear Remodeling!"
Outdoor Kitchen - Clayton
Outdoor Kitchen - Clayton
Outdoor Kitchen - Clayton
Weather Safe
Outdoor Kitchen - Clayton

+127

Response time9 hrs
8 neighbors recently requested a quote
Recommended by58%of homeowners
Avatar for On Design & Remodeling INC
On Design & Remodeling INC
5.0(
46
)
Addition to Existing Structure - Build

Serving Fremont, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2020

Free estimates

Credit card accepted

"I recently had the pleasure of working with ON design for a significant addition and removal project at my home. From start to finish, their professionalism and attention to detail were impeccable. They communicated clearly throughout the process, ensuring I was always up to date with the progress. The quality of their work was exceptional, and they completed the project on time and within budget. I couldn't be happier with the transformation they brought to my home. Highly recommend their services!"
The Willow Oaks project
First floor kitchen and stairs
Master Bathroom remodeling
Open concept Kitchen
The Willow Oaks project

+421

Response time2 days
Response rate100%
30 neighbors recently requested a quote
Avatar for BUILDERS GROUP & DESIGN INC
BUILDERS GROUP & DESIGN INC
5.0(
21
)
Addition to Existing Structure - Build

Serving Fremont, 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

8 neighbors recently requested a quote
Avatar for Masterful Construction, Inc.
Masterful Construction, Inc.
5.0(
28
)
Addition to Existing Structure - Build

Serving Fremont, CA and surrounding areas

Approved

In business since 2023

Free estimates

Credit card accepted

"I had an excellent experience working with Masterful Construction for our building design project. Their team was professional, knowledgeable, and highly skilled. They took the time to understand our needs and delivered a design that exceeded our expectations. The communication throughout the process was great, and they were always responsive to our questions and concerns. I highly recommend their services for any building design needs."
master bathroom
san mateo master bath
mirror
Master bathroom
master bathroom

+66

Response time12 hrs
Response rate85%
3 neighbors recently requested a quote
Avatar for Rose Remodeling & Design Inc.
Rose Remodeling & Design Inc.
4.8(
95
)
Addition to Existing Structure - Build

Serving Fremont, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Emergency services offered

"I had a second storey addition completed by Rose Remodeling, and the results are truly amazing. The team did an outstanding job blending the new structure seamlessly with the existing architecture so that it looks like it was always part of the house. Adir guided us through every step, answered all of our questions, and kept the process stress-free. We now have the extra space we needed, and the work exceeded all of our expectations. Highly recommend their services."
PHOTO ALBUM
PHOTO ALBUM
PHOTO ALBUM
PHOTO ALBUM
PHOTO ALBUM

+128

Response time6 hrs
Response rate95%
17 neighbors recently requested a quote
Avatar for Build The Bay, Inc.
Build The Bay, Inc.
4.9(
27
)
Addition to Existing Structure - Build

Serving Fremont, CA and surrounding areas

Approved

In business since 2020

Free estimates

Warranties offered

"Eitan and his crew at Build the Bay came highly recommended to me by my sister-in-law and her husband who used them to remodel their bathroom. Working with Eitan was a delight! He responds within minutes of text messages and phone calls. He is very reliable and a man of his word. The crew at Build the Bay remodeled our bathrooms and we couldn't be happier. The crew takes pride in their work and it shows in the final result. If something was amiss, I merely had to speak with either Eitan or Jesus and the problem would be addressed immediately. His crew was also great to work with and very accommodating. It is not often you find a contractor who is so focused on both customer service and quality of work. We were so happy with their work, we will be starting another project with them next month. I highly recommend them!"
kitchen
kitchen
fireplace
bathroom
bathroom

+314

Response time12 hrs
Response rate96%
Recommended by91%of homeowners
Avatar for Benlo Remodeling
Benlo Remodeling
5.0(
24
)
Addition to Existing Structure - Build

Serving Fremont, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2025

Free estimates

Credit card accepted

"Hired Benlo for a partial home renovation including some structural walls. It is hard to find contractors who actually manage the project from start to finish without disappearing but Benjamin was on-site frequently and kept the crew on track. They were very clear about the costs upfront and didn't hit us with hidden fees halfway through. Very satisfied with the professional approach."
Modern Kitchen Remodel
Modern Kitchen Remodel
Modern Kitchen Remodel
Modern Kitchen Remodel
Modern Kitchen Remodel

+1

Response time3 hrs
Response rate100%
3 neighbors recently requested a quote
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FAQs for addition to existing structure building service projects in Fremont, 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 Fremont, 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.