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Find Addition to existing structure builders in Hayward

Avatar for Square Three, Inc.

Square Three, Inc.

830 Stewart Dr #272
4.92(
6
)
Approved Pro

Square Three, Inc.

830 Stewart Dr #272
4.92(
6
)
Approved Pro
Customers say: Quality work
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
10 years of experience

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. Our senior team has 10-20 years of experience specifically in the SF Bay Area. We look forward to earning your business! Book with us online or feel free to give us a call today!

"Sanjeev has a solid team working for him that is very capable and deliver quality work. Very flexible and always trying to accommodate our needs even with unexpected changes to the project plan. Highly recommended."

Jannik O on April 2022

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. Our senior team has 10-20 years of experience specifically in the SF Bay Area. We look forward to earning your business! Book with us online or feel free to give us a call today!

"Sanjeev has a solid team working for him that is very capable and deliver quality work. Very flexible and always trying to accommodate our needs even with unexpected changes to the project plan. Highly recommended."

Jannik O on April 2022


North Point Construction and Restoration, Inc.

5114 Port Chicago Hwy B
New on HomeAdvisorNew on HomeAdvisor
Approved Pro

North Point Construction and Restoration, Inc.

5114 Port Chicago Hwy B
New on HomeAdvisorNew on HomeAdvisor
Approved Pro
8 years of experience
Free onsite estimate

At North Point Construction and Restoration, Inc., we pride our company on reliability, great communication, integrity, and quality work that customers can believe in. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business and working with you! 20 years of experience.

At North Point Construction and Restoration, Inc., we pride our company on reliability, great communication, integrity, and quality work that customers can believe in. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business and working with you! 20 years of experience.


Universal Construction Company

161 Martin Place
4.71(
7
)
Approved Pro

Universal Construction Company

161 Martin Place
4.71(
7
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
45 years of experience

We are a locally owned and operated company that values honesty and integrity, and treats your home as if it were our own. We offer a variety of general contractor and home improvement services that are customizable to each individual project. We specialize in additions and bathroom remodels, but also offer a wide range of expertise for a variety of other projects. 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!

"He is very good, communicates well, and he is there when he says he will be and very thorough! I liked doing business with him! He explains everything that he will do before he does the job and he listens to my suggestions."

Marilyn B on June 2019

We are a locally owned and operated company that values honesty and integrity, and treats your home as if it were our own. We offer a variety of general contractor and home improvement services that are customizable to each individual project. We specialize in additions and bathroom remodels, but also offer a wide range of expertise for a variety of other projects. 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!

"He is very good, communicates well, and he is there when he says he will be and very thorough! I liked doing business with him! He explains everything that he will do before he does the job and he listens to my suggestions."

Marilyn B on June 2019


Avatar for Fixit Construction, Inc.

Fixit Construction, Inc.

184 Bowling Green Street
3.00(
1
)
Approved Pro

Fixit Construction, Inc.

184 Bowling Green Street
3.00(
1
)
Approved Pro
Customers say: Terrific value
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
11 years of experience

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business! Book with us online or feel free to give us a call today!

"They were professional and completed the project on time."

Elizabete T on September 2016

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business! Book with us online or feel free to give us a call today!

"They were professional and completed the project on time."

Elizabete T on September 2016


"Updating our home was a dream we have had for years. But finding a good contractor in Bay Area was so difficult, that we almost gave up. We were introduced to United C Construction by our architect(who we also love!) It was exhausting trying to find someone trustworthy and not overpriced. We had luck of working with Osmar which during the project we had clear communication, expectation of setting, professionalism and superior craftsmanship. He walked us through every step of the way, and helped problem solve tough permitting and structural issues in Berkeley!"

Shelby R on September 2024

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

"Updating our home was a dream we have had for years. But finding a good contractor in Bay Area was so difficult, that we almost gave up. We were introduced to United C Construction by our architect(who we also love!) It was exhausting trying to find someone trustworthy and not overpriced. We had luck of working with Osmar which during the project we had clear communication, expectation of setting, professionalism and superior craftsmanship. He walked us through every step of the way, and helped problem solve tough permitting and structural issues in Berkeley!"

Shelby R on September 2024


Ashbury General Contracting and Engineering

40 12th Street
4.50(
2
)
Approved Pro

Ashbury General Contracting and Engineering

40 12th Street
4.50(
2
)
Approved Pro
Customers say: Terrific value
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
35 years of experience

Mon-Fri 7a-5pm Fully integrated company. All work is done in-house by employees not sub-contractors. We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forwards to earning your business! Book with us online or feel free to give us a call today!

"Great work for a great price."

Paul H on March 2023

Mon-Fri 7a-5pm Fully integrated company. All work is done in-house by employees not sub-contractors. We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forwards to earning your business! Book with us online or feel free to give us a call today!

"Great work for a great price."

Paul H on March 2023


AM GENERAL CONTRACTOR

2341 W Ave #133
5.00(
2
)
Approved Pro

AM GENERAL CONTRACTOR

2341 W Ave #133
5.00(
2
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
22 years of experience

We take great pride in our experience, expertise, quality and customer service that we provide to meet every consumer's needs. It is our mission to provide excellent customer service from start to completion of a project. To understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a personal and professional manner. Our reputation is based on service, safety and quality, regardless of how large or small the job.

"What ever he plans for the project,He compleat that.He is honest and fair.I will refer him to my friends and family."

Mina R on November 2020

We take great pride in our experience, expertise, quality and customer service that we provide to meet every consumer's needs. It is our mission to provide excellent customer service from start to completion of a project. To understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a personal and professional manner. Our reputation is based on service, safety and quality, regardless of how large or small the job.

"What ever he plans for the project,He compleat that.He is honest and fair.I will refer him to my friends and family."

Mina R on November 2020


Avatar for Springs Construction Corporation

Springs Construction Corporation

881 Hurlingame Ave
New on HomeAdvisorNew on HomeAdvisor
Approved Pro

Springs Construction Corporation

881 Hurlingame Ave
New on HomeAdvisorNew on HomeAdvisor
Approved Pro
66 years of experience
Free onsite estimate

Since 1959, Springs Construction has built its reputation on fine craftsmanship, technical expertise and solid project management.We take a proactive, client driven approach to every one of our projects, exceeding our customers vision for their homes. We want you to feel comfortable and safe during the disruption and enjoy your home for years to come.

Since 1959, Springs Construction has built its reputation on fine craftsmanship, technical expertise and solid project management.We take a proactive, client driven approach to every one of our projects, exceeding our customers vision for their homes. We want you to feel comfortable and safe during the disruption and enjoy your home for years to come.


Avatar for Hummingbird Development, LLC

Hummingbird Development, LLC

8 Skander Ct
5.00(
2
)
Approved Pro

Hummingbird Development, LLC

8 Skander Ct
5.00(
2
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
22 local quotes requested

Ever wonder how contractors come up with their pricing? Why are prices so high? Five years ago, we had that same question. We started as real estate investors and developers. Every time we had to hire contractors, their pricing made no sense, and their approach was disorganized and random. That's when we decided to start our own contracting firm. At Hummingbird Development, we apply rational pricing, orderly processes and schedules, and a focus on quality. And because we started out as real estate developers, we always look at costs first, and don't spend our clients’ money indiscriminately. We look for ways to add high quality touches where it matters, without overspending on items that aren't necessary. We are a family business focused on helping homeowners add value without breaking the budget.

"They did excellent work and cleaned up well after themselves. Very professional."

Katie C on August 2024

Ever wonder how contractors come up with their pricing? Why are prices so high? Five years ago, we had that same question. We started as real estate investors and developers. Every time we had to hire contractors, their pricing made no sense, and their approach was disorganized and random. That's when we decided to start our own contracting firm. At Hummingbird Development, we apply rational pricing, orderly processes and schedules, and a focus on quality. And because we started out as real estate developers, we always look at costs first, and don't spend our clients’ money indiscriminately. We look for ways to add high quality touches where it matters, without overspending on items that aren't necessary. We are a family business focused on helping homeowners add value without breaking the budget.

"They did excellent work and cleaned up well after themselves. Very professional."

Katie C on August 2024


Avatar for Skytech Builders

Skytech Builders

1714 Seville Way
5.00(
21
)
Approved Pro

Skytech Builders

1714 Seville Way
5.00(
21
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
141 local quotes requested

Welcome to Sky Tech builders, a general professional construction company. Our Decades of experience in the construction and home improvement Industry will help you achieve all your dreams and have the home you always wanted. At Sky Tech we are not just general contractors, we are also homeowners. We know what it’s like to have a big home improvement project in front of you. But we also know the satisfaction of the finished job, enjoying a new, updated home that you created. That’s why we are dedicated to making it as easy as possible for you to get exactly what you are seeking. As a construction company we want to help each and any of our customers accomplish their dreams of a complete home renovation. Our mission is to give you the best quality products and customer service making you and us enjoy this mutual adventure. We guarantee your satisfaction, and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Check out our services offered and call or click to schedule an estimate today!

"The Hall and Master Bathrooms were fully renovated with new cabinets, countertops, showers and fixtures. Leo from Skytech assisted me along the way with option choices and recommendations. The crew was exceptional in their workmanship and were very detail oriented and made sure to clean the area prior to departure each day. I have received multiple compliments on the finished bathrooms. I would highly recommend Skytech Builders to anyone considering renovations and Leo in particular."

Bob H on July 2025

Welcome to Sky Tech builders, a general professional construction company. Our Decades of experience in the construction and home improvement Industry will help you achieve all your dreams and have the home you always wanted. At Sky Tech we are not just general contractors, we are also homeowners. We know what it’s like to have a big home improvement project in front of you. But we also know the satisfaction of the finished job, enjoying a new, updated home that you created. That’s why we are dedicated to making it as easy as possible for you to get exactly what you are seeking. As a construction company we want to help each and any of our customers accomplish their dreams of a complete home renovation. Our mission is to give you the best quality products and customer service making you and us enjoy this mutual adventure. We guarantee your satisfaction, and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Check out our services offered and call or click to schedule an estimate today!

"The Hall and Master Bathrooms were fully renovated with new cabinets, countertops, showers and fixtures. Leo from Skytech assisted me along the way with option choices and recommendations. The crew was exceptional in their workmanship and were very detail oriented and made sure to clean the area prior to departure each day. I have received multiple compliments on the finished bathrooms. I would highly recommend Skytech Builders to anyone considering renovations and Leo in particular."

Bob H on July 2025

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FAQs for addition to existing structure building service projects in Hayward, CA

Yes, hidden rooms are legal, as long as they meet all local building regulations. If you sell your house, most states require homeowners to disclose full houseplans, which would include any hidden rooms.

If your secret room is a safe room, it should contain a means of communication aside from a cell phone, such as a shortwave radio. You should also have plenty of drinking water, a portable generator, emergency food supplies, blankets, pillows, flashlights, batteries and a first aid kit.

Any time you update your home’s square footage, you increase its value, but a secret room is a niche feature that doesn't rank high on every buyer’s list of must-haves. Investing your money in remodeling more common living areas like bedrooms, bathrooms, or kitchens will have a higher ROI than adding a secret room. Many secret rooms can act as entertainment spaces (think a game room or wine cellar) or quiet spaces (a library or study), so when building your secret room you may want to consider its versatility for when you’re ready to sell.

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.

  • A renovated kitchen with a waterfall island

    HomeAdvisor’s DIY Kitchen Remodel Cost Guide looks at the cost of buying supplies and doing the work yourself. Find the key cost factors and how to cut expenses.

  • Secret room within bookcase

    HomeAdvisor's expert guide walks you through the cost to build a secret room, whether you're creating a safe room for security or a fun space to fulfil your childhood fantasies. Use this guide to help plan your secret room project and explore room, concea

  • outdoor patio bar

    Explore the cost to build a bar in your home and learn how materials, wet vs. dry bars, and labor costs influence the total price of your project.