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Find Addition to existing structure builders in Diamond Bar

Avatar for A&E General Builders Co

A&E General Builders Co

5.00(
2
)
Approved Pro

A&E General Builders Co

5.00(
2
)
Approved Pro
5 years of experience
Free onsite estimate

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 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!

"Excellent service quick and convenient did not take long at all very honest with work they do 100% recommend "

Nestor G on July 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 General Contractor 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!

"Excellent service quick and convenient did not take long at all very honest with work they do 100% recommend "

Nestor G on July 2025


Avatar for Socal Express Restoration and Construction Inc.

Socal Express Restoration and Construction Inc.

New on HomeAdvisorNew on HomeAdvisor
Approved Pro

Socal Express Restoration and Construction Inc.

New on HomeAdvisorNew on HomeAdvisor
Approved Pro
5 years of experience
Free onsite estimate

We are an ethical, honest and professional company. We are easy to communicate with. Always working with you until the job is done right and to your specifications. When working with our company you can expect integrity, prompt service and superior customer service. Always leaving the job site clean . We take pride in our services and enjoy making clients repeat clients. You can count on us to get the job done right the first time. We will meet with you at your convenience and will not keep you waiting. Call us today for your free estimate. You'll be pleased you did. Thank you

We are an ethical, honest and professional company. We are easy to communicate with. Always working with you until the job is done right and to your specifications. When working with our company you can expect integrity, prompt service and superior customer service. Always leaving the job site clean . We take pride in our services and enjoy making clients repeat clients. You can count on us to get the job done right the first time. We will meet with you at your convenience and will not keep you waiting. Call us today for your free estimate. You'll be pleased you did. Thank you


Avatar for Golan Remodeling, Inc.

Golan Remodeling, Inc.

4.85(
17
)
Approved Pro

Golan Remodeling, Inc.

4.85(
17
)
Approved Pro
Customers say: Quality work
20 years of experience
Free onsite estimate

Golan Remodeling, Inc. is one of the state's premier home improvement companies servicing the Los Angeles and Ventura Counties. We specialize in complete bathroom and kitchen detailed remodeling. We are committed to provide all of our customers with reasonable pricing, quality workmanship, and professional service. We are extremely professional and regardless of how big or small the project may be we always take pride in our company name and our work. For all of your home improvement needs Golan Remodeling, Inc. is above and beyond the rest.

"Golan Remodeling just finished a bathroom remodel for us, and we?re beyond impressed.The project manager was fantastic. He walked us through every step and made sure we were happy with the progress. The tile work and fixtures they installed are beautiful, and the whole bathroom feels like a spa now. The team was professional, clean, and respectful of our home. They are the best in Los Angeles. I?d give them 10 stars if I could!"

Mike C on March 2025

Golan Remodeling, Inc. is one of the state's premier home improvement companies servicing the Los Angeles and Ventura Counties. We specialize in complete bathroom and kitchen detailed remodeling. We are committed to provide all of our customers with reasonable pricing, quality workmanship, and professional service. We are extremely professional and regardless of how big or small the project may be we always take pride in our company name and our work. For all of your home improvement needs Golan Remodeling, Inc. is above and beyond the rest.

"Golan Remodeling just finished a bathroom remodel for us, and we?re beyond impressed.The project manager was fantastic. He walked us through every step and made sure we were happy with the progress. The tile work and fixtures they installed are beautiful, and the whole bathroom feels like a spa now. The team was professional, clean, and respectful of our home. They are the best in Los Angeles. I?d give them 10 stars if I could!"

Mike C on March 2025


Valdovinos Construction

5.00(
3
)
Approved Pro

Valdovinos Construction

5.00(
3
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
35 years of experience

Valdovinos Construction is dedicated to providing our customers with the best quality and craftsmanship. We are here to build relationships with our customers and communities and to provide our employees with a great place to work. Valdovinos Construction is a leader in providing our customers with the highest quality craftsmanship 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! Call us for all you remodeling and home building needs!

"Hi, I am very glad i got a chance to meet this contractor, others would have over priced me and this man help me a lot, I mean he gave me options and showed me different designs. I did read these reviews which one made me iffi but i know for a fact this company did not take cash from me which i felt safe since i had copies of all our contracts and invoices were in tact. I would recommend him for sure and if i ever need any other remodeling i know who i will contact. once again thank you from my family to you."

Teresa L on July 2024

Valdovinos Construction is dedicated to providing our customers with the best quality and craftsmanship. We are here to build relationships with our customers and communities and to provide our employees with a great place to work. Valdovinos Construction is a leader in providing our customers with the highest quality craftsmanship 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! Call us for all you remodeling and home building needs!

"Hi, I am very glad i got a chance to meet this contractor, others would have over priced me and this man help me a lot, I mean he gave me options and showed me different designs. I did read these reviews which one made me iffi but i know for a fact this company did not take cash from me which i felt safe since i had copies of all our contracts and invoices were in tact. I would recommend him for sure and if i ever need any other remodeling i know who i will contact. once again thank you from my family to you."

Teresa L on July 2024


DAM Ventures, Inc.

4.33(
87
)
Approved Pro

DAM Ventures, Inc.

4.33(
87
)
Approved Pro
Customers say: Quality work
9 years of experience
Free onsite estimate

We pride our company on reliability, great communication, integrity, and quality work. We strongly believe in giving our absolute best in all of our projects no matter how big or small. We are experts in our trade and will always keep you educated on your particular task or project. We look forward to earning your business!

"Very good customer service."

jay l on January 2022

We pride our company on reliability, great communication, integrity, and quality work. We strongly believe in giving our absolute best in all of our projects no matter how big or small. We are experts in our trade and will always keep you educated on your particular task or project. We look forward to earning your business!

"Very good customer service."

jay l on January 2022


Avatar for CASSINI CONSTRUCTION

CASSINI CONSTRUCTION

5.00(
6
)
Approved Pro

CASSINI CONSTRUCTION

5.00(
6
)
Approved Pro
20 years of experience
Free onsite estimate

What began as a vision in 2011 has since evolved into more than just the standard construction company. We have exceeded far beyond not just our competitors, but the very limits of what construction can endure. At Cassini, our mission is to craft intelligent, elegant, and inspiring environments. Every material we choose, every detail we refine, all guided by a pursuit of permanence delivering beauty and longevity rarely seen today. 5 STARS on YELP AND GOOGLE

"Bathroom/ pavers/ turf / outside fireplace/ and patio cover.."

robert S on April 2025

What began as a vision in 2011 has since evolved into more than just the standard construction company. We have exceeded far beyond not just our competitors, but the very limits of what construction can endure. At Cassini, our mission is to craft intelligent, elegant, and inspiring environments. Every material we choose, every detail we refine, all guided by a pursuit of permanence delivering beauty and longevity rarely seen today. 5 STARS on YELP AND GOOGLE

"Bathroom/ pavers/ turf / outside fireplace/ and patio cover.."

robert S on April 2025


"Overall my experience with this company was great! The work that was done was really really good! Our contractor who assisted us was Jose. We added a living space and master bedroom to our home. The additions done look as if they were part of my house this whole time. Honestly it looks way better than I expected. The only reason I rated the company a 4.5 was because there was always some kind of miscommunication between our contractor and his workers. Don t get me wrong, things were always resolved, Jose was great at that. But my recommendation to is to make sure communication is #1. That way the customer is not confused or left wondering what will happen next. There was an issue with his floor guy though, he was rude and unprofessional. BUT the reason I am mentioning this is not to put down the company but let you know that we expressed concern for this issue and it was resolved professionally by Jose and it never became an issue again. The quality of work was top notch! His workers were all pretty cool guys and we always felt comfortable of who was coming into our home to do the work. I highly recommend this company for your next big project😊👍🏼"

Victoria V on February 2020

Here at Embee & Associates, Inc., we pride ourselves in a job well done. With an eye for detail, we will help your dreams become realities so please contact us today for a fast and friendly service that you will not be disappointed in!!

"Overall my experience with this company was great! The work that was done was really really good! Our contractor who assisted us was Jose. We added a living space and master bedroom to our home. The additions done look as if they were part of my house this whole time. Honestly it looks way better than I expected. The only reason I rated the company a 4.5 was because there was always some kind of miscommunication between our contractor and his workers. Don t get me wrong, things were always resolved, Jose was great at that. But my recommendation to is to make sure communication is #1. That way the customer is not confused or left wondering what will happen next. There was an issue with his floor guy though, he was rude and unprofessional. BUT the reason I am mentioning this is not to put down the company but let you know that we expressed concern for this issue and it was resolved professionally by Jose and it never became an issue again. The quality of work was top notch! His workers were all pretty cool guys and we always felt comfortable of who was coming into our home to do the work. I highly recommend this company for your next big project😊👍🏼"

Victoria V on February 2020


Avatar for MF Construction & Design Inc

MF Construction & Design Inc

4.86(
64
)
Approved Pro

MF Construction & Design Inc

4.86(
64
)
Approved Pro
Customers say: Super punctual
Recommended by 96% of Angi customers
Recommended by 96% of HomeAdvisor customers
73 local quotes requested

We are proud of our excellent reviews and Super Service Awards every year. We have no salespersons and you work directly with the contractor and owner. We specialize in kitchens, bathrooms, additions and new home construction. We are a family owned business and our quality and satisfaction is guaranteed. We have serviced the Los Angeles area for over 25 years and have references available upon request. Free estimates are available and remodeled kitchens and homes are available for you to see. Visit our website at www.mfcdesignsite.com or email us at info@mfcdesignsite.com for more information.

"Mike remodeled the upstairs of our condo five years ago and did such a great job that he was the only contractor we wanted for our downstairs kitchen and bathroom remodel. Once again he and his crew did a great job"

Ron M on March 2025

We are proud of our excellent reviews and Super Service Awards every year. We have no salespersons and you work directly with the contractor and owner. We specialize in kitchens, bathrooms, additions and new home construction. We are a family owned business and our quality and satisfaction is guaranteed. We have serviced the Los Angeles area for over 25 years and have references available upon request. Free estimates are available and remodeled kitchens and homes are available for you to see. Visit our website at www.mfcdesignsite.com or email us at info@mfcdesignsite.com for more information.

"Mike remodeled the upstairs of our condo five years ago and did such a great job that he was the only contractor we wanted for our downstairs kitchen and bathroom remodel. Once again he and his crew did a great job"

Ron M on March 2025


Avatar for HIC Builders, Inc.

HIC Builders, Inc.

5.00(
11
)
Approved Pro

HIC Builders, Inc.

5.00(
11
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
912 local quotes requested

HIC ( Home Ideas and Construction ) is a Family owned Business we are construction company. We look forward to coming out to your home and exploring the best, most efficient and budget conscious way we can upgrade you home. Specialize in Remodeling kitchens, bathrooms, pavers, outdoor landscape, patio enclosures, painting and ADU's to garage conversion from blueprinting to city permits we can walk you thru . We know that you are putting your faith and trust in your contractor, we work hard to earn your trust and satisfaction. Our team of experts offers you the latest modern and eco-friendly, materials and aesthetic work that you can imagine.

"ADU construction Plumbing, electrical, drywall, Painting"

Elbia M on February 2025

HIC ( Home Ideas and Construction ) is a Family owned Business we are construction company. We look forward to coming out to your home and exploring the best, most efficient and budget conscious way we can upgrade you home. Specialize in Remodeling kitchens, bathrooms, pavers, outdoor landscape, patio enclosures, painting and ADU's to garage conversion from blueprinting to city permits we can walk you thru . We know that you are putting your faith and trust in your contractor, we work hard to earn your trust and satisfaction. Our team of experts offers you the latest modern and eco-friendly, materials and aesthetic work that you can imagine.

"ADU construction Plumbing, electrical, drywall, Painting"

Elbia M on February 2025


Avatar for Avanti Construction Group, Inc.

Avanti Construction Group, Inc.

5.00(
27
)
Approved Pro

Avanti Construction Group, Inc.

5.00(
27
)
Approved Pro
Super Service Award
26 local quotes requested
1 years of experience

LOOK NO FURTHER! Avanti Construction Group is a California-based licensed design-build contractor specializing in architectural, engineering, and construction solutions for residential, commercial, and multifamily projects. We combine innovative design with precision construction management to streamline every phase. Our team of designers, builders, and project managers works under one contract to ensure cost efficiency, speed, and quality. With full transparency and sustainability in mind, we transform visions into functional, refined spaces that meet California’s strict building and energy codes. Why Homeowners Choose Us: Experience stress-free construction with daily project updates, clear communication, and on-site accountability. Core Services: Roofing, HVAC Upgrades, Window Installations, Additions & ADUs, Interior Layout Reconfiguration, Decks. Trusted • Licensed • Stress-Free

"????? Our roof replacement was completed ahead of schedule and the quality of the work is outstanding. The team kept everything neat and made the whole process stress-free.Crew did an excellent job, answered all our questions, and left everything spotless. Great experience overall."

Scott C on October 2025

LOOK NO FURTHER! Avanti Construction Group is a California-based licensed design-build contractor specializing in architectural, engineering, and construction solutions for residential, commercial, and multifamily projects. We combine innovative design with precision construction management to streamline every phase. Our team of designers, builders, and project managers works under one contract to ensure cost efficiency, speed, and quality. With full transparency and sustainability in mind, we transform visions into functional, refined spaces that meet California’s strict building and energy codes. Why Homeowners Choose Us: Experience stress-free construction with daily project updates, clear communication, and on-site accountability. Core Services: Roofing, HVAC Upgrades, Window Installations, Additions & ADUs, Interior Layout Reconfiguration, Decks. Trusted • Licensed • Stress-Free

"????? Our roof replacement was completed ahead of schedule and the quality of the work is outstanding. The team kept everything neat and made the whole process stress-free.Crew did an excellent job, answered all our questions, and left everything spotless. Great experience overall."

Scott C on October 2025

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FAQs for addition to existing structure building service projects in Diamond Bar, 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 Diamond Bar, 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.