Top-rated addition to existing structure builders.

Get matched with top addition to existing structure builders in Simi Valley, 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 Simi Valley

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 West Side Builder

West Side Builder

5.00(
7
)
Approved Pro

West Side Builder

5.00(
7
)
Approved Pro
Customers say: Quick response
4 years of experience
Free onsite estimate

We are a locally owned and operated company that values honesty, integrity, and will treat your home as if it were our own. We have many years of experience to give you confidence that we are your number one choice for your next home project. You will find us to be competitively priced, while still paying close attention to the details of each and every project that we are involved with. We take pride in building long lasting relationships and look forward to hearing from you!

"They were on time and they did a great job"

Katie G on February 2022

We are a locally owned and operated company that values honesty, integrity, and will treat your home as if it were our own. We have many years of experience to give you confidence that we are your number one choice for your next home project. You will find us to be competitively priced, while still paying close attention to the details of each and every project that we are involved with. We take pride in building long lasting relationships and look forward to hearing from you!

"They were on time and they did a great job"

Katie G on February 2022


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 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


Larry Dow Construction

New on HomeAdvisorNew on HomeAdvisor
Approved Pro

Larry Dow Construction

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

Larry Dow Construction has served the Agoura Hills and Malibu areas for years with pride and integrity. With a focus on providing excellent work at an affordable price, let Larry and the pros with Larry Down Construction provide the work that truly meets your needs Call for a FREE ESTIMATE!

Larry Dow Construction has served the Agoura Hills and Malibu areas for years with pride and integrity. With a focus on providing excellent work at an affordable price, let Larry and the pros with Larry Down Construction provide the work that truly meets your needs Call for a FREE ESTIMATE!


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 Teddy's Fine Builders

Teddy's Fine Builders

5.00(
2
)
Approved Pro

Teddy's Fine Builders

5.00(
2
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
3 years of experience

Teddy's Fine Builders offers all types of home improvement services. From electrical system upgrade, roofing, concrete services, flooring, air conditioning, new windows, and much more. Maximize your land value. An addition of an accessory dwelling unit (ADU) can increase the value of your property. Maximize your ROI! We create exclusive looks inspired by your personal style, event needs, and taste. Our team uses their eye for detail and high-quality salon products to deliver a range of services.

"They were punctual, they finished in a timely manner, fast,clean work."

Jesus M on March 2023

Teddy's Fine Builders offers all types of home improvement services. From electrical system upgrade, roofing, concrete services, flooring, air conditioning, new windows, and much more. Maximize your land value. An addition of an accessory dwelling unit (ADU) can increase the value of your property. Maximize your ROI! We create exclusive looks inspired by your personal style, event needs, and taste. Our team uses their eye for detail and high-quality salon products to deliver a range of services.

"They were punctual, they finished in a timely manner, fast,clean work."

Jesus M on March 2023


Avatar for Next Level Builders & Design

Next Level Builders & Design

5.00(
5
)
Approved Pro

Next Level Builders & Design

5.00(
5
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
3 years of experience

Next Level Builders & Design 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. We look forward to working with you!

"Julian kept me informed every step of the way with the process involved with building the entire pool. Very knowledgeable and honest with his assessment , Highly recommended. He did a great job."

Ken K on April 2024

Next Level Builders & Design 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. We look forward to working with you!

"Julian kept me informed every step of the way with the process involved with building the entire pool. Very knowledgeable and honest with his assessment , Highly recommended. He did a great job."

Ken K on April 2024


Avatar for Fox Builders Group, Inc.

Fox Builders Group, Inc.

4.93(
15
)
Approved Pro

Fox Builders Group, Inc.

4.93(
15
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
14 years of experience

We are a locally owned and operated company with 15+ years of industry experience. We value honesty and integrity, and stand behind our work. We specialize in both interior and exterior residential and commercial painting projects. We pride ourselves on the quality of our work as well as our commitment to outstanding results. We look forward to building long-term relationships with our clients and guarantee your satisfaction!

"Pricing and repair of wood and stucco was included in quote. Rates were beyond reasonable. Appreciated that Edwin was upfront on how long job would take, that they took their time. And supplied a photo potty for workers to use. Would recommend to others and will use again."

Letitia M on September 2024

We are a locally owned and operated company with 15+ years of industry experience. We value honesty and integrity, and stand behind our work. We specialize in both interior and exterior residential and commercial painting projects. We pride ourselves on the quality of our work as well as our commitment to outstanding results. We look forward to building long-term relationships with our clients and guarantee your satisfaction!

"Pricing and repair of wood and stucco was included in quote. Rates were beyond reasonable. Appreciated that Edwin was upfront on how long job would take, that they took their time. And supplied a photo potty for workers to use. Would recommend to others and will use again."

Letitia M on September 2024

...
Showing 1-10 of 1066
FAQs for addition to existing structure building service projects in Simi Valley, 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 Simi Valley, 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.