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

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

Serving Hayward, 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(
119
)
Addition to Existing Structure - Build

Serving Hayward, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Warranties offered

"Our basement went from a dark storage area to a cozy family room and home office. The remodel was smooth from start to finish. Great communication, thoughtful design ideas, and skilled workmanship throughout."
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 by62%of homeowners
Avatar for Home By Tom, Inc
Home By Tom, Inc
5.0(
56
)
Addition to Existing Structure - Build

Serving Hayward, 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

4 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 Hayward, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2017

Free estimates

Customers say: True professional

"Bear Remodeling Inc helped us with a room addition, and the whole experience was smooth and stress-free. The team was respectful, hardworking. The new space fits perfectly with the rest of our home. We are beyond pleased and highly recommend Bear Remodeling Inc for quality work and great service!"
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 Hayward, 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

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

Serving Hayward, CA and surrounding areas

Approved

In business since 2023

Free estimates

Credit card accepted

"Masterful Construction is a company that truly understands the art of building design. I had the pleasure of working with their team on a commercial project, and their ability to deliver exceptional design solutions was remarkable. Project manager Yuvi and his crew took the time to understand the unique requirements of the project and provided creative ideas that optimized space utilization and incorporated sustainable elements. Their expertise in materials selection, lighting design, and architectural aesthetics resulted in a visually stunning and functional building that impressed everyone who visited. Masterful Construction's commitment to excellence and their passion for their craft make them a top choice 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 Bay Remodeling Kitchen & Bath
Bay Remodeling Kitchen & Bath
5.0(
69
)
Addition to Existing Structure - Build

Serving Hayward, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2006

Free estimates

Emergency services offered

"To create my ideal kitchen, the staff at Bay Remodeling Kitchen & Bath went above and beyond. They listened to my thoughts, made useful recommendations, and transformed my kitchen into a lovely, hospitable area."
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

15 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 Hayward, CA and surrounding areas

Approved (Corporate)

In business since 2015

Free estimates

Emergency services offered

"Shay is an outstanding project manager and a creator. He has really looked out for us throughout the re-modal process. His daily communication was essential. I looked forward to the texts, Shay and his team of people kept us informed every step of the remodeling. Shay, built trust with his strong communication and his attention to detail. He made us feel relaxed through the process and I am very happy and excited by the results. Our bathrooms are everything we could have asked for. If we ever do any additional remodeling… we would just call Shay."
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
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FAQs for addition to existing structure building service projects in Hayward, 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 Hayward, 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.