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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!


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


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


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
11 local quotes requested
18 years of experience

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


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
12 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


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


Robert McCollister Construction Inc
1512 D St
5.00(
3
)
Approved Pro
Robert McCollister Construction Inc
1512 D St
5.00(
3
)
Approved Pro
Customers say: Quick response
11 local quotes requested
15 years of experience

Robert McCollister Construction, 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 customers' interests and make their concerns the basis of our business.

"Robert is a veteran to the contracting business. He is a “salt of the earth” gentleman with an incredible skill set that he utilized to bring our vision to reality. This was a very intricate build, taking a 1940’s cottage and doubling its size while updating absolutely everything. His subcontractors are top notch which matches Robert’s impeccable work ethic. We are absolutely thrilled with the results. "

Patrick Celiberti T on February 2025

Robert McCollister Construction, 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 customers' interests and make their concerns the basis of our business.

"Robert is a veteran to the contracting business. He is a “salt of the earth” gentleman with an incredible skill set that he utilized to bring our vision to reality. This was a very intricate build, taking a 1940’s cottage and doubling its size while updating absolutely everything. His subcontractors are top notch which matches Robert’s impeccable work ethic. We are absolutely thrilled with the results. "

Patrick Celiberti T on February 2025


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
224 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 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
72 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

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
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