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Find Addition to existing structure builders in El Cajon

Avatar for Remcon Design Build

Remcon Design Build

7154 Convoy Ct
5.00(
1
)
Approved Pro

Remcon Design Build

7154 Convoy Ct
5.00(
1
)
Approved Pro
19 years of experience
Free onsite estimate

Remcon Design Build 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.

Remcon Design Build 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.


Avatar for SL United Construction, Inc.

SL United Construction, Inc.

1917 La Cresta Road
5.00(
4
)
Approved Pro

SL United Construction, Inc.

1917 La Cresta Road
5.00(
4
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
9 years of experience

Welcome to SL United Construction, Inc. We proudly provide the highest quality of service and craftsmanship to each and every aspect of your project. Our depth of knowledge and experience solidify our belief that customer service stands as the top priority. We eagerly look forward to working with you to bring your vision to reality. Give us a call today and lets get started!

"SL United Construction did a superb job on our basement remodel, and outdoor deck rebuild. They also coordinated a beautiful new driveway for us. They are honest, knowledgeable, responsive, and flexible. All this at a very reasonable cost! Highest recommendation!"

Gerard M on November 2019

Welcome to SL United Construction, Inc. We proudly provide the highest quality of service and craftsmanship to each and every aspect of your project. Our depth of knowledge and experience solidify our belief that customer service stands as the top priority. We eagerly look forward to working with you to bring your vision to reality. Give us a call today and lets get started!

"SL United Construction did a superb job on our basement remodel, and outdoor deck rebuild. They also coordinated a beautiful new driveway for us. They are honest, knowledgeable, responsive, and flexible. All this at a very reasonable cost! Highest recommendation!"

Gerard M on November 2019


Dryfix Services, Inc.

2252 Main St Unit 10
New on HomeAdvisorNew on HomeAdvisor
Approved Pro

Dryfix Services, Inc.

2252 Main St Unit 10
New on HomeAdvisorNew on HomeAdvisor
Approved Pro
13 years of experience
Free onsite estimate

We are 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."

We are 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."


Active Endeavor, Inc.

4124 North Bonita Street
5.00(
3
)
Approved Pro

Active Endeavor, Inc.

4124 North Bonita Street
5.00(
3
)
Approved Pro
Customers say: Quick response
14 years of experience
Free onsite estimate

A E Design & Build 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. Rated A+ by the BBB, timely communication 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.

"Dirk was a consummate professional. His work was completed on time and under my budget as he worked to save us money rather than trying to upsell at every opportunity. His crew were very skilled and friendly. I will utilize them in the future on another project and would recommend him to anyone looking for construction done on their house"

Rusty D on August 2024

A E Design & Build 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. Rated A+ by the BBB, timely communication 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.

"Dirk was a consummate professional. His work was completed on time and under my budget as he worked to save us money rather than trying to upsell at every opportunity. His crew were very skilled and friendly. I will utilize them in the future on another project and would recommend him to anyone looking for construction done on their house"

Rusty D on August 2024


Avatar for Olalde Group, Inc.

Olalde Group, Inc.

741 East Adams Park Drive
5.00(
2
)
Approved Pro

Olalde Group, Inc.

741 East Adams Park Drive
5.00(
2
)
Approved Pro
Customers say: Quick response
6 years of experience
Free onsite estimate

Olalde Group, 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 makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business. Please give us a call today!

"David and Efrain did an amazing job converting our oversized 2 car garage into a one bedroom apartment. They were very attentive, cost conscious and efficient! They were on hand monitoring the subcontractors and making sure the job was done correctly. They did a great job and we are very gratefully for their hard work!"

Darlene J on October 2025

Olalde Group, 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 makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business. Please give us a call today!

"David and Efrain did an amazing job converting our oversized 2 car garage into a one bedroom apartment. They were very attentive, cost conscious and efficient! They were on hand monitoring the subcontractors and making sure the job was done correctly. They did a great job and we are very gratefully for their hard work!"

Darlene J on October 2025


Avatar for MVP Leaders, Inc.

MVP Leaders, Inc.

20301 Ventura Blvd #225
4.29(
7
)
Approved Pro

MVP Leaders, Inc.

20301 Ventura Blvd #225
4.29(
7
)
Approved Pro
Customers say: Quality work
20 years of experience
Free onsite estimate

We want to change your space! It's time to once again appreciate the space that you live in and bring family and friends together in a space that you can be proud of, that represents who you are and how you want to live. From elegant interiors and inspirational exteriors to additions and Accessory Dwelling Units, MVP Builders brings years of experience, an on-budget/on-time production schedule, and a transparent project management approach to every job we take on.

"If you are dealing with MVP Builders I would be very careful. The people they hire for the jobs are not very knowledgeable and they do sloppy work. When you try to reach out to them to fix the problem they do not call back."

Tony R on May 2017

We want to change your space! It's time to once again appreciate the space that you live in and bring family and friends together in a space that you can be proud of, that represents who you are and how you want to live. From elegant interiors and inspirational exteriors to additions and Accessory Dwelling Units, MVP Builders brings years of experience, an on-budget/on-time production schedule, and a transparent project management approach to every job we take on.

"If you are dealing with MVP Builders I would be very careful. The people they hire for the jobs are not very knowledgeable and they do sloppy work. When you try to reach out to them to fix the problem they do not call back."

Tony R on May 2017


Avatar for Gilbert Construction Design & Remodeling

Gilbert Construction Design & Remodeling

1468 Curtis Lane
5.00(
14
)
Approved Pro

Gilbert Construction Design & Remodeling

1468 Curtis Lane
5.00(
14
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
47 local quotes requested

Family owned and operated since 1981. Here at Gilbert Construction Design & Remodeling, every job is meticulously supervised by the owner. We take pride in our service, quality, and customer satisfaction. We are proud to provide FREE ESTIMATES for new home construction, room additions, kitchen remodels, master bed & bath remodels, 2nd story additions, full home renovations, guest homes, ADU’s, garage conversions, and outdoor living spaces. Contact us today for a free consultation!

"It was honestly the best experience! The attention to detail was what impressed me the most. The bid was very detailed and the Gilberts were with us every step of the way. Chad took every single one of my many calls. Discussed options for change orders and kept us apprised of all that was going on. Wendy came in with such great ideas on how to set up the kitchen to maximize the space to make it look and feel huge. Was so happy and satisfied that we went on to remodel two more houses with them!!"

Nancy L on March 2024

Family owned and operated since 1981. Here at Gilbert Construction Design & Remodeling, every job is meticulously supervised by the owner. We take pride in our service, quality, and customer satisfaction. We are proud to provide FREE ESTIMATES for new home construction, room additions, kitchen remodels, master bed & bath remodels, 2nd story additions, full home renovations, guest homes, ADU’s, garage conversions, and outdoor living spaces. Contact us today for a free consultation!

"It was honestly the best experience! The attention to detail was what impressed me the most. The bid was very detailed and the Gilberts were with us every step of the way. Chad took every single one of my many calls. Discussed options for change orders and kept us apprised of all that was going on. Wendy came in with such great ideas on how to set up the kitchen to maximize the space to make it look and feel huge. Was so happy and satisfied that we went on to remodel two more houses with them!!"

Nancy L on March 2024


Avatar for BE HOME REMODELING INC

BE HOME REMODELING INC

282 Bayview Ave
4.95(
11
)
Approved Pro

BE HOME REMODELING INC

282 Bayview Ave
4.95(
11
)
Approved Pro
Customers say: Quick response
589 local quotes requested
1 years of experience

Be Home Remodeling is a home improvement company dedicated to transforming spaces with quality craftsmanship and personalized service. We specialize in a range of remodeling projects, from kitchens and bathrooms to full home renovations, back yard remodeling and more. Our team of experienced professionals collaborates closely with clients to understand their vision and bring it to life, ensuring each project reflects their style and meets their needs. Whether you're looking to update a single room or undertake a complete overhaul, Be Home Remodeling is here to make your dream home a reality.

"My journey began when I met Mario from Be Home Remodeling. I started with just one bathroom remodel, and I was immediately impressed by the professionalism, attention to detail, and high-quality craftsmanship he and his team delivered. The communication throughout the project was clear and consistent, and they made sure every step met my expectations. Since then, I?ve trusted Be Home Remodeling with additional projects and have always been more than satisfied with the results. Highly recommend Mario and his team to anyone looking for reliable and high-quality construction work"

nate b on July 2025

Be Home Remodeling is a home improvement company dedicated to transforming spaces with quality craftsmanship and personalized service. We specialize in a range of remodeling projects, from kitchens and bathrooms to full home renovations, back yard remodeling and more. Our team of experienced professionals collaborates closely with clients to understand their vision and bring it to life, ensuring each project reflects their style and meets their needs. Whether you're looking to update a single room or undertake a complete overhaul, Be Home Remodeling is here to make your dream home a reality.

"My journey began when I met Mario from Be Home Remodeling. I started with just one bathroom remodel, and I was immediately impressed by the professionalism, attention to detail, and high-quality craftsmanship he and his team delivered. The communication throughout the project was clear and consistent, and they made sure every step met my expectations. Since then, I?ve trusted Be Home Remodeling with additional projects and have always been more than satisfied with the results. Highly recommend Mario and his team to anyone looking for reliable and high-quality construction work"

nate b on July 2025


Avatar for Ritz Design Build, a Division of Budge-It Home Remodeling, Inc.

Ritz Design Build, a Division of Budge-It Home Remodeling, Inc.

7878 Clairemont Mesa Blvd, Suite K
4.94(
15
)
Approved Pro

Ritz Design Build, a Division of Budge-It Home Remodeling, Inc.

7878 Clairemont Mesa Blvd, Suite K
4.94(
15
)
Approved Pro
Customers say: Quality work
Recommended by 93% of Angi customers
Recommended by 93% of HomeAdvisor customers
17 local quotes requested

Ritz Design Build, has served all of San Diego County as a design-build contractor since 1965.Their specialty is designing and building Accessory Dwelling Units, ADU's, and custom home additions, such as Master Suites, Family Rooms, Granny Flats (ADU's) Kitchen Extensions, and Second Stories. They also offer a 3D design service on all qualifying projects. This service allows homeowners to visualize their completed projects during the initial design stage. The service includes both interior and exterior 3D renderings and floor plan options. Put their 55 years of tried & true experience to work for you and see why so many of your neighbors have already chosen Ritz Design Build to design and build their home addition.

"From the first meeting with Ed and Claudia, my family knew we were in great hands. They listened to our needs and wants and offered advice to help us make the best decisions for our family. During the design process, all the details we reviewed and the team listened. The final design was exactly what I wanted. Once Ritz began the remodel, I was kept in the loop from permits, inspections, timelines, and everything else. I was never guessing. The project manger, Aiden, listened to all my questions and made sure I understood each decision made. When it came to the details, Aiden was always a phone call away. He spent hours working to make sure everything was perfect and that I was happy with the end results. Ritz was professional and timely and even completed the project within in the timeframe (over a month earlier than projected). During demolition, the crew worked to overcome any challenges that came their way. The construction process moved quickly and each team was professional. All subcontractors were part of the team ( plumbing, flooring, painting, etc.) they always were professional and answered any questions I had. Even during a pandemic, Ritz was able to design and build my dream home. I appreciate all their hard work and dedication to the remodel. Aiden is knowledgeable with his skills and handy work and led the team with excellence. Eddie designed a home that met all my family needs. The crews were top notch and the best of the best. And Ed and Claudia always treated us like family when we met. If you need your home remodeled, Ritz is the company for you."

Christinia E on February 2022

Ritz Design Build, has served all of San Diego County as a design-build contractor since 1965.Their specialty is designing and building Accessory Dwelling Units, ADU's, and custom home additions, such as Master Suites, Family Rooms, Granny Flats (ADU's) Kitchen Extensions, and Second Stories. They also offer a 3D design service on all qualifying projects. This service allows homeowners to visualize their completed projects during the initial design stage. The service includes both interior and exterior 3D renderings and floor plan options. Put their 55 years of tried & true experience to work for you and see why so many of your neighbors have already chosen Ritz Design Build to design and build their home addition.

"From the first meeting with Ed and Claudia, my family knew we were in great hands. They listened to our needs and wants and offered advice to help us make the best decisions for our family. During the design process, all the details we reviewed and the team listened. The final design was exactly what I wanted. Once Ritz began the remodel, I was kept in the loop from permits, inspections, timelines, and everything else. I was never guessing. The project manger, Aiden, listened to all my questions and made sure I understood each decision made. When it came to the details, Aiden was always a phone call away. He spent hours working to make sure everything was perfect and that I was happy with the end results. Ritz was professional and timely and even completed the project within in the timeframe (over a month earlier than projected). During demolition, the crew worked to overcome any challenges that came their way. The construction process moved quickly and each team was professional. All subcontractors were part of the team ( plumbing, flooring, painting, etc.) they always were professional and answered any questions I had. Even during a pandemic, Ritz was able to design and build my dream home. I appreciate all their hard work and dedication to the remodel. Aiden is knowledgeable with his skills and handy work and led the team with excellence. Eddie designed a home that met all my family needs. The crews were top notch and the best of the best. And Ed and Claudia always treated us like family when we met. If you need your home remodeled, Ritz is the company for you."

Christinia E on February 2022


Avatar for American Construction, Plumbing and Electric

American Construction, Plumbing and Electric

7007 Deerhurst Ct
5.00(
11
)
Approved Pro

American Construction, Plumbing and Electric

7007 Deerhurst Ct
5.00(
11
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
79 local quotes requested

At American Construction, Plumbing and Electric, we’re a full-service remodeling and construction company proudly licensed in General Contracting, Plumbing, Electrical, and HVAC. With all trades handled in-house, we provide streamlined project execution from start to finish—eliminating the delays and miscommunication that come with outsourcing. Backed by over 30 years of combined experience between our business partners, we deliver professional, code-compliant work across all phases of residential and light commercial construction. From kitchen remodels to full home renovations, we’re your one-stop solution for quality craftsmanship and reliable service.

"We originally wanted to wait until our spa was fully finished to leave a review, but we just had to rave about Gabe and his team. They have been SO easy to work with—and when you’re opening a second spa location in San Diego, easy is everything. Gabe moved fast (he’ll be done by Monday—EEK!), and for business owners, time is money, so having a contractor who’s in and out efficiently is HUGE. During the project, he discovered some mold in the building. Not only did he notify the property owners immediately, but he also took care of the remediation, followed all proper protocols, and handled it all on his own. We’re forever grateful for how quickly and professionally he resolved it. Honestly, our favorite thing about working with Gabe is how he consistently goes above and beyond—especially in ways we didn’t expect, which meant a lot to us as two female business owners. We never once felt taken advantage of, which sadly can be a rare experience in this industry. To give you an idea of how fast he worked: our space includes five treatment rooms, two storage rooms, a kitchen, an office, and a lobby. He redesigned and completed the whole buildout in just over a month. He’s also a great communicator—sending us frequent updates, photos, and videos of the progress, which gave us so much peace of mind since we couldn’t always be on-site. His pricing is incredibly fair and, in our opinion, makes him unmatched in this industry. His work is impeccable, and it doesn’t break the bank. We truly could not recommend Gabe and his team more!"

Lianna L on June 2025

At American Construction, Plumbing and Electric, we’re a full-service remodeling and construction company proudly licensed in General Contracting, Plumbing, Electrical, and HVAC. With all trades handled in-house, we provide streamlined project execution from start to finish—eliminating the delays and miscommunication that come with outsourcing. Backed by over 30 years of combined experience between our business partners, we deliver professional, code-compliant work across all phases of residential and light commercial construction. From kitchen remodels to full home renovations, we’re your one-stop solution for quality craftsmanship and reliable service.

"We originally wanted to wait until our spa was fully finished to leave a review, but we just had to rave about Gabe and his team. They have been SO easy to work with—and when you’re opening a second spa location in San Diego, easy is everything. Gabe moved fast (he’ll be done by Monday—EEK!), and for business owners, time is money, so having a contractor who’s in and out efficiently is HUGE. During the project, he discovered some mold in the building. Not only did he notify the property owners immediately, but he also took care of the remediation, followed all proper protocols, and handled it all on his own. We’re forever grateful for how quickly and professionally he resolved it. Honestly, our favorite thing about working with Gabe is how he consistently goes above and beyond—especially in ways we didn’t expect, which meant a lot to us as two female business owners. We never once felt taken advantage of, which sadly can be a rare experience in this industry. To give you an idea of how fast he worked: our space includes five treatment rooms, two storage rooms, a kitchen, an office, and a lobby. He redesigned and completed the whole buildout in just over a month. He’s also a great communicator—sending us frequent updates, photos, and videos of the progress, which gave us so much peace of mind since we couldn’t always be on-site. His pricing is incredibly fair and, in our opinion, makes him unmatched in this industry. His work is impeccable, and it doesn’t break the bank. We truly could not recommend Gabe and his team more!"

Lianna L on June 2025

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FAQs for addition to existing structure building service projects in El Cajon, CA

Yes, hidden rooms are legal, as long as they meet all local building regulations. If you sell your house, most states require homeowners to disclose full houseplans, which would include any hidden rooms.

If your secret room is a safe room, it should contain a means of communication aside from a cell phone, such as a shortwave radio. You should also have plenty of drinking water, a portable generator, emergency food supplies, blankets, pillows, flashlights, batteries and a first aid kit.

Any time you update your home’s square footage, you increase its value, but a secret room is a niche feature that doesn't rank high on every buyer’s list of must-haves. Investing your money in remodeling more common living areas like bedrooms, bathrooms, or kitchens will have a higher ROI than adding a secret room. Many secret rooms can act as entertainment spaces (think a game room or wine cellar) or quiet spaces (a library or study), so when building your secret room you may want to consider its versatility for when you’re ready to sell.

The El Cajon, 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.

  • A renovated kitchen with a waterfall island

    HomeAdvisor’s DIY Kitchen Remodel Cost Guide looks at the cost of buying supplies and doing the work yourself. Find the key cost factors and how to cut expenses.

  • Secret room within bookcase

    HomeAdvisor's expert guide walks you through the cost to build a secret room, whether you're creating a safe room for security or a fun space to fulfil your childhood fantasies. Use this guide to help plan your secret room project and explore room, concea

  • outdoor patio bar

    Explore the cost to build a bar in your home and learn how materials, wet vs. dry bars, and labor costs influence the total price of your project.