Top-rated addition to existing structure builders.

Get matched with top addition to existing structure builders in Altadena, CA

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.

Find Addition to existing structure builders in Altadena

Avatar for DT Design and Build, Inc.

DT Design and Build, Inc.

4.91(
64
)
Approved Pro

DT Design and Build, Inc.

4.91(
64
)
Approved Pro
Customers say: True professional
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
11 years of experience

We at DT Design and Build, Inc., focus on the quality of our projects over quantity. We use our years of experience and expertise to complete your project with perfection. Customer service and honesty are the most important aspects of our business and your satisfaction is always guaranteed. Please call us today for an estimate. We look forward to working with you. Serious inquiries only please. If you have any question please call us at 818-2724213

"Very satisfied with this company. Finished the project in a timely manner. Tal is a great guy. Very caring and did everything possible for me to be happy"

Liana F on November 2024

We at DT Design and Build, Inc., focus on the quality of our projects over quantity. We use our years of experience and expertise to complete your project with perfection. Customer service and honesty are the most important aspects of our business and your satisfaction is always guaranteed. Please call us today for an estimate. We look forward to working with you. Serious inquiries only please. If you have any question please call us at 818-2724213

"Very satisfied with this company. Finished the project in a timely manner. Tal is a great guy. Very caring and did everything possible for me to be happy"

Liana F on November 2024


Avatar for United Express Construction, Inc.

United Express Construction, Inc.

5.00(
1
)
Approved Pro

United Express Construction, Inc.

5.00(
1
)
Approved Pro
18 years of experience
Free onsite estimate

United Express Construction Inc is an innovative, locally owned and operated Construction and solar installation company in Los Angeles. With years of experience in solar power system installations and General Contracting, for both residential and commercial markets, we guarantee to always provide you with top-notch, premium quality solar panel installation and construction services in Los Angeles and surrounding cities.

United Express Construction Inc is an innovative, locally owned and operated Construction and solar installation company in Los Angeles. With years of experience in solar power system installations and General Contracting, for both residential and commercial markets, we guarantee to always provide you with top-notch, premium quality solar panel installation and construction services in Los Angeles and surrounding cities.


Avatar for Legacy Contractors Group Inc

Legacy Contractors Group Inc

5.00(
1
)
Approved Pro

Legacy Contractors Group Inc

5.00(
1
)
Approved Pro
Free onsite estimate
Emergency services offered

Founded on principles of honesty and transparency, Legacy Contractors Group Inc offers a modern and ethical approach to construction and remodeling. Specializing in new home builds, kitchen and bathroom renovations, and extensive remodeling projects, our company is dedicated to transforming properties with expertise and a personal touch. With a mission to give back to the community that shaped us, we provide high-quality craftsmanship and clear communication, ensuring a seamless and satisfying experience for every homeowner. Legacy Contractors Group Inc was founded by three young professionals bringing together expertise on the fields of construction, regulatory compliance and business management. Build Your Legacy with Us!

"The price was right, the job was done on time and the work was precise "

Elias D on October 2025

Founded on principles of honesty and transparency, Legacy Contractors Group Inc offers a modern and ethical approach to construction and remodeling. Specializing in new home builds, kitchen and bathroom renovations, and extensive remodeling projects, our company is dedicated to transforming properties with expertise and a personal touch. With a mission to give back to the community that shaped us, we provide high-quality craftsmanship and clear communication, ensuring a seamless and satisfying experience for every homeowner. Legacy Contractors Group Inc was founded by three young professionals bringing together expertise on the fields of construction, regulatory compliance and business management. Build Your Legacy with Us!

"The price was right, the job was done on time and the work was precise "

Elias D on October 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


YOR Construction and Investments, Inc.

3.00(
2
)
Approved Pro

YOR Construction and Investments, Inc.

3.00(
2
)
Approved Pro
Customers say: Quick response
16 years of experience

YOR Construction and Investments, 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.

"THE WORST EXPERIENCE EVER! We signed a contract with Yakov to design an ADU. He raved that his engineer was on his staff as an employee and that she previously worked for LA planning so she understood how to more efficiently complete plans to be done sooner. The mistakes and time in between for her to submit corrections were so long there was no reason for it. When we were given so many excuses I contacted the city myself to get a true timeline and found that the corrections were issued by city and they were very basic items that any engineer should not have even had an issue with and weeks and over 2 months would go by that she did not respond to the corrections. When we reached out to Yakov to get resolution he brushed us off and said we had to handle it with the engineer. He did not always respond to calls. I had to excessively call them both to get the work done. It was nearly two years of stress for the plans to finally be complete and approved with the city. Suffice to say we di"

David J on August 2025

YOR Construction and Investments, 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.

"THE WORST EXPERIENCE EVER! We signed a contract with Yakov to design an ADU. He raved that his engineer was on his staff as an employee and that she previously worked for LA planning so she understood how to more efficiently complete plans to be done sooner. The mistakes and time in between for her to submit corrections were so long there was no reason for it. When we were given so many excuses I contacted the city myself to get a true timeline and found that the corrections were issued by city and they were very basic items that any engineer should not have even had an issue with and weeks and over 2 months would go by that she did not respond to the corrections. When we reached out to Yakov to get resolution he brushed us off and said we had to handle it with the engineer. He did not always respond to calls. I had to excessively call them both to get the work done. It was nearly two years of stress for the plans to finally be complete and approved with the city. Suffice to say we di"

David J on August 2025


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


E D N Painting, Inc.

5.00(
6
)
Approved Pro

E D N Painting, Inc.

5.00(
6
)
Approved Pro
Customers say: Quick response
9 years of experience
Free onsite estimate

With several years of experience, we work hard to bring each customer the best possible service and quality available. We look forward to working with you on your next project. We welcome your questions and thank you for your interest.

"Eder and his team at EDN Painting did a good job painting our interior walls, ceilings and baseboards with attention to detail and providing good service throughout. Eder also did excellent plaster work repair on our hall and living room ceilings as well as repairing settling cracks on our walls. He also help out with improving room lighting . I would recommend to anyone in need of painting or other work to contact Eder at EDN Paiinting, Inc."

Tim I on August 2025

With several years of experience, we work hard to bring each customer the best possible service and quality available. We look forward to working with you on your next project. We welcome your questions and thank you for your interest.

"Eder and his team at EDN Painting did a good job painting our interior walls, ceilings and baseboards with attention to detail and providing good service throughout. Eder also did excellent plaster work repair on our hall and living room ceilings as well as repairing settling cracks on our walls. He also help out with improving room lighting . I would recommend to anyone in need of painting or other work to contact Eder at EDN Paiinting, Inc."

Tim I on August 2025


Avatar for Hollander Group Development & Consulting, Inc.

Hollander Group Development & Consulting, Inc.

5.00(
3
)
Approved Pro

Hollander Group Development & Consulting, Inc.

5.00(
3
)
Approved Pro
Customers say: Quick response
12 years of experience
Free onsite estimate

At Hollander Group, we're the area's top remodeling experts ,serving all homeowners including those with special accessibility needs. Known for quick estimates, attention to detail, and competitive pricing, we're also specialists in accessible home modifications. We transform bathrooms and kitchens to enhance independence for those with mobility challenges, offering solutions like roll-in showers, lowered countertops, and wider doorways. As screened professionals, we ensure your peace of mind while delivering both functionality and beauty.

"They delivered a high quality work on time, which to me is all that matters. Finding a good contractor in this city is like winning the lottery. Highly recommended."

Belle K on June 2024

At Hollander Group, we're the area's top remodeling experts ,serving all homeowners including those with special accessibility needs. Known for quick estimates, attention to detail, and competitive pricing, we're also specialists in accessible home modifications. We transform bathrooms and kitchens to enhance independence for those with mobility challenges, offering solutions like roll-in showers, lowered countertops, and wider doorways. As screened professionals, we ensure your peace of mind while delivering both functionality and beauty.

"They delivered a high quality work on time, which to me is all that matters. Finding a good contractor in this city is like winning the lottery. Highly recommended."

Belle K on June 2024


Avatar for Tulip Remodeling, Inc.

Tulip Remodeling, Inc.

5.00(
39
)
Approved Pro

Tulip Remodeling, Inc.

5.00(
39
)
Approved Pro
Customers say: Quick response
Recommended by 94% of Angi customers
Recommended by 94% of HomeAdvisor customers
9 years of experience

Tulip Remodeling is a full service interior and exterior residential remodeling firm located in Los Angeles County. We are licensed, bonded and insured. Our experienced and dedicated professionals offer the full array of services necessary to help create your ideal space. Some of these services are room additions, room conversions, kitchen and bathroom remodels, outdoor construction and landscaping, driveway installation and construction of outdoor living spaces, including porches and pergolas. We also provide on site project supervision, design assistance, plumbing, electrical, flooring, window, door and fireplace installation. All administrative tasks are handled by our staff. Our goal is to ensure that you have a positive remodeling experience. We pride ourselves on providing you with excellent customer service to be sure that you are entirely satisfied. We look forward to helping you create your ideal living space.

"Tulip Remodeling did an outstanding job with our full first-floor remodel, including new floors, removing walls, and upgrading the kitchen, hall bath, and primary bath. They listened to our needs, overcame obstacles, and turned our house into a lovable home. We are already planning our upstairs renovation with them!"

Yan S on July 2024

Tulip Remodeling is a full service interior and exterior residential remodeling firm located in Los Angeles County. We are licensed, bonded and insured. Our experienced and dedicated professionals offer the full array of services necessary to help create your ideal space. Some of these services are room additions, room conversions, kitchen and bathroom remodels, outdoor construction and landscaping, driveway installation and construction of outdoor living spaces, including porches and pergolas. We also provide on site project supervision, design assistance, plumbing, electrical, flooring, window, door and fireplace installation. All administrative tasks are handled by our staff. Our goal is to ensure that you have a positive remodeling experience. We pride ourselves on providing you with excellent customer service to be sure that you are entirely satisfied. We look forward to helping you create your ideal living space.

"Tulip Remodeling did an outstanding job with our full first-floor remodel, including new floors, removing walls, and upgrading the kitchen, hall bath, and primary bath. They listened to our needs, overcame obstacles, and turned our house into a lovable home. We are already planning our upstairs renovation with them!"

Yan S on July 2024


"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

...
Showing 1-10 of 1058
FAQs for addition to existing structure building service projects in Altadena, 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 Altadena, 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.