Top-rated addition to existing structure builders.

Get matched with top addition to existing structure builders in your area

Enter your zip and get matched with up to 3 pros

Matching on HomeAdvisor

Share some details icon
Share some details about your home project.
Match with local pros icon
Within moments, match with highly-rated local pros.
Compare quotes icon
Compare quotes and choose the best pro for the job.

Addition to existing structure builders in Redwood City

Avatar for Royalty Builders, Inc.
Royalty Builders, Inc.
228 Hamilton Ave 3rd Floor
5.00(
14
)
Approved Pro
Royalty Builders, Inc.
228 Hamilton Ave 3rd Floor
5.00(
14
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
25 years of experience

Royalty Builders Inc is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customer's interests and make their concerns the basis of our business. Please give us a call today 855-744-4424

"Bathroom remodeling Panel upgrade I want to tank royalty builders for the new bathroom the design and the crew was great we are happy with out new bathroom"

Vilma T on June 2024

Royalty Builders Inc is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customer's interests and make their concerns the basis of our business. Please give us a call today 855-744-4424

"Bathroom remodeling Panel upgrade I want to tank royalty builders for the new bathroom the design and the crew was great we are happy with out new bathroom"

Vilma T on June 2024


Avatar for G M J Construction Inc.
G M J Construction Inc.
2582 Amethyst Drive
5.00(
13
)
Approved Pro
G M J Construction Inc.
2582 Amethyst Drive
5.00(
13
)
Approved Pro
Super Service Award
Customers say: Quick response
Recommended by 92% of Angi customers
Recommended by 92% of HomeAdvisor customers
11 years of experience

GMJ construction Is one of the best construction company in the bay area, we focus on providing our customers A Great experience, we provide high-quality project management and excellent finish Work, We are design and build firm,We specialize in new construction home, room addition, kitchen, bathroom and custom work , Feel free to contact us today for a free consultation meeting with one of our great project managers

"GMJ is the perfect spot if you are after an outstanding Eichler home. Joseph communication skills are top-notch, and he understood my needs perfectly. They have incredibly creative and brilliant minds and really grasp what the customer desires. Thanks a bunch, Joseph, for all your assistance! I highly recommend this company to anyone in search of the best Eichler Contractor in Sunnyvale!"

Mike K on May 2024

GMJ construction Is one of the best construction company in the bay area, we focus on providing our customers A Great experience, we provide high-quality project management and excellent finish Work, We are design and build firm,We specialize in new construction home, room addition, kitchen, bathroom and custom work , Feel free to contact us today for a free consultation meeting with one of our great project managers

"GMJ is the perfect spot if you are after an outstanding Eichler home. Joseph communication skills are top-notch, and he understood my needs perfectly. They have incredibly creative and brilliant minds and really grasp what the customer desires. Thanks a bunch, Joseph, for all your assistance! I highly recommend this company to anyone in search of the best Eichler Contractor in Sunnyvale!"

Mike K on May 2024


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


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


RSB Construction Group Inc.
58 W Portal Ave, Unit 150
New on HomeAdvisorNew on Angi
Approved Pro
RSB Construction Group Inc.
58 W Portal Ave, Unit 150
New on AngiNew on HomeAdvisor
Approved Pro
4 years of experience
Free onsite estimate

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!

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!


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


Avatar for Aria Custom Home Builder
Aria Custom Home Builder
6376 Mayo Drive
5.00(
2
)
Approved Pro
Aria Custom Home Builder
6376 Mayo Drive
5.00(
2
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
19 years of experience

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

"They responded in a timely manner and were able to get the job done quickly to the date we asked with great expertise work. We were very satisfied and will use them again for another project."

Sheri A on October 2019

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

"They responded in a timely manner and were able to get the job done quickly to the date we asked with great expertise work. We were very satisfied and will use them again for another project."

Sheri A on October 2019


Avatar for ICON Home Builders, Inc.
ICON Home Builders, Inc.
2375 Zanker Rd, Suite 225
5.00(
2
)
Approved Pro
ICON Home Builders, Inc.
2375 Zanker Rd, Suite 225
5.00(
2
)
Approved Pro
Customers say: Quick response
2 years of experience
Free onsite estimate

ICON Home Builders is a full-service general contractor specializing in high-quality home remodels, renovations, and custom builds in the San Francisco Bay Area. We transform homes with custom kitchens, luxurious bathrooms, full renovations, and home additions, combining expert craftsmanship and personalized design. Known for our attention to detail, clear communication, and efficient project management, we ensure your home reflects your vision. We serve Santa Clara, San Mateo, Alameda, and Contra Costa counties, and are EPA Lead-Safe Certified and CSLB Licensed (#1102095). Whether you're looking for a complete home transformation or a specific remodel, ICON Home Builders delivers on time and within budget, ensuring the highest standards in every project.

"Danny's expertise shone through from our very first meeting, where he presented an impressive initial design that immediately instilled confidence in the project's outcome. His meticulous planning and efficient execution made the process nearly effortless for me. Throughout the project, Danny demonstrated exceptional professionalism: He patiently addressed all my questions, ensuring I felt informed and comfortable with each decision. He took charge of the shopping process, offering valuable professional advice on material selections. When the initially chosen tile color didn't translate well from the store to my home, Danny proactively brought a sample for us to evaluate in situ. This attention to detail allowed us to pivot and select a more suitable option that enhanced the overall aesthetic. The final result exceeded my expectations, with Danny's design acumen particularly evident in the enlarged shower space. His thoughtful approach to space utilization has significantly improved the functionality and appeal of the room. Danny's combination of design talent, project management skills, and client-focused service resulted in a fantastic outcome that I'm thrilled with"

Yu Z on September 2024

ICON Home Builders is a full-service general contractor specializing in high-quality home remodels, renovations, and custom builds in the San Francisco Bay Area. We transform homes with custom kitchens, luxurious bathrooms, full renovations, and home additions, combining expert craftsmanship and personalized design. Known for our attention to detail, clear communication, and efficient project management, we ensure your home reflects your vision. We serve Santa Clara, San Mateo, Alameda, and Contra Costa counties, and are EPA Lead-Safe Certified and CSLB Licensed (#1102095). Whether you're looking for a complete home transformation or a specific remodel, ICON Home Builders delivers on time and within budget, ensuring the highest standards in every project.

"Danny's expertise shone through from our very first meeting, where he presented an impressive initial design that immediately instilled confidence in the project's outcome. His meticulous planning and efficient execution made the process nearly effortless for me. Throughout the project, Danny demonstrated exceptional professionalism: He patiently addressed all my questions, ensuring I felt informed and comfortable with each decision. He took charge of the shopping process, offering valuable professional advice on material selections. When the initially chosen tile color didn't translate well from the store to my home, Danny proactively brought a sample for us to evaluate in situ. This attention to detail allowed us to pivot and select a more suitable option that enhanced the overall aesthetic. The final result exceeded my expectations, with Danny's design acumen particularly evident in the enlarged shower space. His thoughtful approach to space utilization has significantly improved the functionality and appeal of the room. Danny's combination of design talent, project management skills, and client-focused service resulted in a fantastic outcome that I'm thrilled with"

Yu Z on September 2024


Avatar for Springs Construction Corporation
Springs Construction Corporation
881 Hurlingame Ave
New on HomeAdvisorNew on Angi
Approved Pro
Springs Construction Corporation
881 Hurlingame Ave
New on AngiNew 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 Visualized Precision Construction
Visualized Precision Construction
751 Laurel Street Unit 306
5.00(
1
)
Approved Pro
Visualized Precision Construction
751 Laurel Street Unit 306
5.00(
1
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
7 years of experience

At Visualized Precision we can work with you to renovate your entire home or just help you update a kitchen and bathroom into something you love. We also specialize in finish carpentry, cabinet installation and drywall.

"They did a tremendous job! Rebecca is on top of everything, Josh is very communicative, and great people to work with! My experience with them was tremendous!"

Anthony M on February 2020

At Visualized Precision we can work with you to renovate your entire home or just help you update a kitchen and bathroom into something you love. We also specialize in finish carpentry, cabinet installation and drywall.

"They did a tremendous job! Rebecca is on top of everything, Josh is very communicative, and great people to work with! My experience with them was tremendous!"

Anthony M on February 2020

...
Showing 1-10 of 985

Addition to existing structure building services FAQs

How far you can push a room depends on the structure you choose. A cantilevered bump-out can extend 24 inches before building codes require its own footing or foundation. Anything longer needs engineered support and a permit. Check local codes or consult with a structural professional before finalizing plans to ensure your design remains safe and compliant.

Most bump-outs are completed within one to four weeks, even with minimal electrical, plumbing, or HVAC work. Their compact size means less demolition, simpler inspections, and fewer weather-related delays compared to a full-scale addition. Your contractor can provide a more precise timeline once they have determined the scope, materials, and permit schedule, but plan on having the extra square footage ready in approximately a month.

The 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.
BLUE TWO STORY HOME
Apr 30, 2025
Apr 30, 2025
Budget for the cost to add a second story based on factors such as size, foundation work, materials, labor, permits, post-construction cleaning, and more.
small bathroom that has been updated in a remodel
Apr 29, 2025
Apr 29, 2025
Budget for the cost to remodel a small bathroom based on factors such as required fixtures, bathroom size, labor, remodel type, site prep, and more.
guest house in the backyard
Apr 27, 2025
Apr 27, 2025
Need to build a guest house? Here’s how much it costs, what factors affect cost, and what to expect.
Kitchen view leading into dining area
Apr 28, 2025
Apr 28, 2025
Use this guide to budget for bump-out addition costs based on factors such as room size, room type, labor, finishes, permits, and more.
House roof with nice window
Apr 28, 2025
Apr 28, 2025
Budget for dormer addition costs based on factors such as roof type, framing, customizations, reinforcement, cladding, labor, and more.
newly installed kitchen countertops in modern kitchen
Apr 26, 2025
Apr 26, 2025
Need to replace your kitchen countertop? Here’s how much it costs, what factors affect cost, and what to expect.
Share project details to get started.