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Addition to existing structure builders in Saint Helena

Avatar for Grid Design Build
Grid Design Build
1500 3rd St, Suite A
New on HomeAdvisorNew on Angi
Approved Pro
Grid Design Build
1500 3rd St, Suite A
New on AngiNew on HomeAdvisor
Approved Pro
3 years of experience
Free onsite estimate

We’re 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 Home Improvement services that are customizable to each individual project. We specialize in Additions and Kitchen 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!

We’re 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 Home Improvement services that are customizable to each individual project. We specialize in Additions and Kitchen 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!


Big River Builders, Inc.
5510 Skylane Boulevard, Suite 203
4.50(
2
)
Approved Pro
Big River Builders, Inc.
5510 Skylane Boulevard, Suite 203
4.50(
2
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
11 local quotes requested

BIG RIVER BUILDERS INC offers 40 years experience and the best customer service. We are here to build relationships with our customers and communities. BIG RIVER BUILDERS INC is a leader providing our customers with the highest quality products and craftsmanship in an honest, efficient, and professional way. We believe in building trust, treating every project with the utmost integrity and exceeding expectations. We look forward to working with you!

"The employees were great. A couple of days there was only 1 man on the job due to illness. The company did not replace him, so the 1 man had to work alone, slowing down the completion of the project. Art and Johnny were great to work with. Communication with the office was a little lacking, but overall we are happy with the work."

Bruce J on September 2020

BIG RIVER BUILDERS INC offers 40 years experience and the best customer service. We are here to build relationships with our customers and communities. BIG RIVER BUILDERS INC is a leader providing our customers with the highest quality products and craftsmanship in an honest, efficient, and professional way. We believe in building trust, treating every project with the utmost integrity and exceeding expectations. We look forward to working with you!

"The employees were great. A couple of days there was only 1 man on the job due to illness. The company did not replace him, so the 1 man had to work alone, slowing down the completion of the project. Art and Johnny were great to work with. Communication with the office was a little lacking, but overall we are happy with the work."

Bruce J on September 2020


Homes West Construction
P.O. Box 2453
2.75(
3
)
Approved Pro
Homes West Construction
P.O. Box 2453
2.75(
3
)
Approved Pro
10 local quotes requested
23 years of experience

Homes West Construction provides top quality work in the Napa area specializing in structural repairs, remodels and new construction. Our professional crew is proficient in all areas of the building process and are dedicated to delivering an excellent product at a competitive price and in a timely fashion.

"Great contractor. He helped to design and pick out fixtures. Excellent work doing my front porch in three weeks."

Robert P on December 2020

Homes West Construction provides top quality work in the Napa area specializing in structural repairs, remodels and new construction. Our professional crew is proficient in all areas of the building process and are dedicated to delivering an excellent product at a competitive price and in a timely fashion.

"Great contractor. He helped to design and pick out fixtures. Excellent work doing my front porch in three weeks."

Robert P on December 2020


Wadleigh Group, Inc.
214 Club Drive
New on HomeAdvisorNew on Angi
Approved Pro
Wadleigh Group, Inc.
214 Club Drive
New on AngiNew on HomeAdvisor
Approved Pro
18 years of experience
Free onsite estimate

Wadleigh Group, 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 customers' interests, and make their concerns the basis of our business.

Wadleigh Group, 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 customers' interests, and make their concerns the basis of our business.


Advanced Construction Company
4251 Susan Lane
5.00(
3
)
Approved Pro
Advanced Construction Company
4251 Susan Lane
5.00(
3
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
34 years of experience

ACC has been providing residential/commercial remodeling services to Northern CA since 1991. We are reliable, provide detailed estimates and competitive pricing. We are a Certified Green Builder. Advanced Construction Company has been in business since 1991, specializing in residential remodels. During the past 30 years, we have taken pride in providing 100% customer satisfaction through honesty, dependability and quality workmanship. Ed Story (owner/president) has more than 35 years of experience in the construction industry. An innovative problem solver, Ed brings experience and creative insight to every job. Experts in making your visions a reality, we use only quality materials and supplies and consistently work with the same subcontractors. Offering competitive fixed bid prices for any kind of work, ACC is the answer to all of your construction and remodeling needs.

"Very professional and easy to work with."

Carol H on July 2016

ACC has been providing residential/commercial remodeling services to Northern CA since 1991. We are reliable, provide detailed estimates and competitive pricing. We are a Certified Green Builder. Advanced Construction Company has been in business since 1991, specializing in residential remodels. During the past 30 years, we have taken pride in providing 100% customer satisfaction through honesty, dependability and quality workmanship. Ed Story (owner/president) has more than 35 years of experience in the construction industry. An innovative problem solver, Ed brings experience and creative insight to every job. Experts in making your visions a reality, we use only quality materials and supplies and consistently work with the same subcontractors. Offering competitive fixed bid prices for any kind of work, ACC is the answer to all of your construction and remodeling needs.

"Very professional and easy to work with."

Carol H on July 2016


RSF Construction Inc.
6910 Monte Verde Drive
New on HomeAdvisorNew on Angi
Approved Pro
RSF Construction Inc.
6910 Monte Verde Drive
New on AngiNew on HomeAdvisor
Approved Pro
223 local quotes requested
6 years of experience

RSF Construction Inc. is a leader in providing our customers with the highest quality service in an honest, efficient, and professional way. Our pledge is to create successful relationships with our customers, employees and community by building trust, treating every project with the utmost integrity and exceeding expectations. We look forward to working with you!

RSF Construction Inc. is a leader in providing our customers with the highest quality service in an honest, efficient, and professional way. Our pledge is to create successful relationships with our customers, employees and community by building trust, treating every project with the utmost integrity and exceeding expectations. We look forward to working with you!


Avatar for Green Bay Remodeling
Green Bay Remodeling
1015 2nd Street
4.77(
33
)
Approved Pro
Green Bay Remodeling
1015 2nd Street
4.77(
33
)
Approved Pro
Customers say: Quick response
Recommended by 96% of Angi customers
Recommended by 96% of HomeAdvisor customers
31 local quotes requested

We make our customers happy every day with every project! Green Bay Remodeling Inc is an award-winning home remodeling and renovating company with an outstanding design-build portfolio in the San Francisco Bay Area. We provide free consultations to our clients and ensure services are customized to serve each project. With our unique processes, we deliver remarkable designs and successful builds that result in a noteworthy client satisfaction rating. Our unified team of experts develops premium concepts for your whole home remodeling, additions, kitchens, new homes, and bathrooms. Here are our requirements to go over before booking an appointment: We ask to meet the homeowners for the initial meeting and it usually takes an hour. We do not submit estimates for any project that involves insurance claims. Our estimates are free, but we don't accept jobs less than $6K. With Green Bay Remodeling, you get a dedicated project manager to answer all your questions from start to finish!

"Greenbay delivered exactly what they promised and in the time frame they quoted. Our project manager Vlady was a great guy and really helped us select the right materials and look for our master bathroom. We would be happy to do business with them again."

Douglas L on August 2021

We make our customers happy every day with every project! Green Bay Remodeling Inc is an award-winning home remodeling and renovating company with an outstanding design-build portfolio in the San Francisco Bay Area. We provide free consultations to our clients and ensure services are customized to serve each project. With our unique processes, we deliver remarkable designs and successful builds that result in a noteworthy client satisfaction rating. Our unified team of experts develops premium concepts for your whole home remodeling, additions, kitchens, new homes, and bathrooms. Here are our requirements to go over before booking an appointment: We ask to meet the homeowners for the initial meeting and it usually takes an hour. We do not submit estimates for any project that involves insurance claims. Our estimates are free, but we don't accept jobs less than $6K. With Green Bay Remodeling, you get a dedicated project manager to answer all your questions from start to finish!

"Greenbay delivered exactly what they promised and in the time frame they quoted. Our project manager Vlady was a great guy and really helped us select the right materials and look for our master bathroom. We would be happy to do business with them again."

Douglas L on August 2021


Avatar for Prosper Construction Development, Inc.
Prosper Construction Development, Inc.
180 Steuart St., Box 194631
4.88(
38
)
Approved Pro
Prosper Construction Development, Inc.
180 Steuart St., Box 194631
4.88(
38
)
Approved Pro
Customers say: Quick response
Recommended by 97% of Angi customers
Recommended by 97% of HomeAdvisor customers
246 local quotes requested

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 services that are customizable to each individual project. You will find us to be competitively priced, paying close attention to the details of each and every project that we are involved with. We look forward to building lasting relationships, and guarantee your satisfaction!

"Fast response and clear communication throughout the process."

Marco T on April 2025

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 services that are customizable to each individual project. You will find us to be competitively priced, paying close attention to the details of each and every project that we are involved with. We look forward to building lasting relationships, and guarantee your satisfaction!

"Fast response and clear communication throughout the process."

Marco T on April 2025


Pabst Blue Ribbon General Construction
PO Box 753
4.67(
20
)
Approved Pro
Pabst Blue Ribbon General Construction
PO Box 753
4.67(
20
)
Approved Pro
Customers say: Quality work
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
13 years of experience

Pabst Blue Ribbon General Construction has the knowledge and integrity that you would expect from your trusted contractor. Specializing in New Construction, Remodels, and any other home improvement project, we have you taken care of. Sit back, relax, and let the professionals take over. We can do anything from the ground up. Give us a call for a free estimate!

"The overall experience was perfect. Friendly and actually listened to me. I had problems with previous work that was done. I hired Mr. Pabst and every single thing was fixed. I was always kept informed. I was shown what they were doing and asked for my approval. Excellent Excellent Excellent."

Cheryl H on August 2024

Pabst Blue Ribbon General Construction has the knowledge and integrity that you would expect from your trusted contractor. Specializing in New Construction, Remodels, and any other home improvement project, we have you taken care of. Sit back, relax, and let the professionals take over. We can do anything from the ground up. Give us a call for a free estimate!

"The overall experience was perfect. Friendly and actually listened to me. I had problems with previous work that was done. I hired Mr. Pabst and every single thing was fixed. I was always kept informed. I was shown what they were doing and asked for my approval. Excellent Excellent Excellent."

Cheryl H on August 2024


Avatar for Dynamite Construction Management, Inc.
Dynamite Construction Management, Inc.
1875 Mission St Ste 103 #309
5.00(
3
)
Approved Pro
Dynamite Construction Management, Inc.
1875 Mission St Ste 103 #309
5.00(
3
)
Approved Pro
Customers say: Quick response
71 local quotes requested
15 years of experience

Choosing Dynamite Construction means selecting more than just a contractor?it?s embracing a legacy of excellent construction spanning three generations. With deep roots in the community, our commitment to quality craftsmanship and customer satisfaction is unmatched. Trust us to bring your construction vision to life, with the care and expertise only a local family business can provide. Our expertise includes: Interior Remodeling: Bathrooms, kitchens, and complete interior renovations. Exterior Remodeling: Pavers, concrete, retaining walls, and front/backyard renovations. Decks: Custom natural and synthetic wood decks and balconies. We value your trust and satisfaction and we look forward to working with you on your next remodeling job!

"We had a major kitchen remodelling project in our house including new cabinets, countertops and flooring. Even sinks were replaced. We expected a lot of headaches, delays and unexpected charges. With Spenser and his team none of that happened. He explained from the beginning what our options were, he gave his recommendations that we found quite reasonable. The job started when he said it would and he was regularly checking on the progress. Everything that we wanted to fix (and it wasn?t much) was done at no cost. They did an excellent job, the kitchen is beautiful! "

Vlad S on December 2024

Choosing Dynamite Construction means selecting more than just a contractor?it?s embracing a legacy of excellent construction spanning three generations. With deep roots in the community, our commitment to quality craftsmanship and customer satisfaction is unmatched. Trust us to bring your construction vision to life, with the care and expertise only a local family business can provide. Our expertise includes: Interior Remodeling: Bathrooms, kitchens, and complete interior renovations. Exterior Remodeling: Pavers, concrete, retaining walls, and front/backyard renovations. Decks: Custom natural and synthetic wood decks and balconies. We value your trust and satisfaction and we look forward to working with you on your next remodeling job!

"We had a major kitchen remodelling project in our house including new cabinets, countertops and flooring. Even sinks were replaced. We expected a lot of headaches, delays and unexpected charges. With Spenser and his team none of that happened. He explained from the beginning what our options were, he gave his recommendations that we found quite reasonable. The job started when he said it would and he was regularly checking on the progress. Everything that we wanted to fix (and it wasn?t much) was done at no cost. They did an excellent job, the kitchen is beautiful! "

Vlad S on December 2024

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Addition to existing structure building services FAQs

Building an in-law suite takes between two and seven months. Converting an existing basement, attic, or room can be done in about two months. Constructing a new addition or detached suite often takes four to five months for construction, plus one to two months for permits. The bigger the suite, the longer it will take. 

Yes, you can build an in-law suite in your backyard if you meet local building codes and zoning regulations. An in-law suite often occupies 300 to 800 square feet. Be sure to follow size restrictions, utility separations, and entrance requirements. Hiring a qualified contractor ensures you meet all regulatory requirements because they can pull permits, double-check local code, and gather other skilled pros to work on your suite. 

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.
BRIGHT OPEN ATTIC SPACE
Apr 24, 2025
Apr 24, 2025
An in-law suite is a great solution for people who have family visiting often. Explore how much an in-law suite costs and prep to build yours.
A white wood ceiling
Apr 23, 2025
Apr 23, 2025
Looking to vault a ceiling? Here’s how much it costs, what factors affect cost, and what to expect.
Outdoor view of the modern house
Apr 22, 2025
Apr 22, 2025
Explore how square footage, room type, home additions, and other common factors affect house renovation costs with our detailed cost guide.
A rustic wooden cabin in the woods
Apr 21, 2025
Apr 21, 2025
Discover how much a log cabin costs to build, exploring how factors like its size, site prep, utilities, finishes, and labor rates affect the total price.
CONTRACTOR LOOKING OVER HOME DEVELOPMENT
Apr 19, 2025
Apr 19, 2025
Budget for your general contractor’s hourly rate by considering factors such as project scope, fee structure, pricing model, and more.
stucco home with cracks from earthquake damage
Apr 16, 2025
Apr 16, 2025
Work out the full cost to repair earthquake damage based on the type of damage, including foundation issues, utility lines, and cracked walls.
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