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Find Addition to existing structure builders in Lake Forest

Avatar for HomeKeep Builders

HomeKeep Builders

1000 San Joaquin Plaza
4.61(
19
)
Approved Pro

HomeKeep Builders

1000 San Joaquin Plaza
4.61(
19
)
Approved Pro
Customers say: Terrific value
14 years of experience
Free onsite estimate

Choosing HomeKeep Builders means partnering with a team that truly listens to your needs and delivers results you can trust. We’re not just here to complete a project—we’re here to ensure your home reflects your vision with minimal hassle. Our clients choose us because we prioritize transparency, clear communication, and top-tier craftsmanship. You’ll never be left guessing; we keep you informed every step of the way, ensuring your goals are met on time and within budget. Whether you’re looking to remodel or build new, HomeKeep is as invested in your home as you are. Let us show you how a seamless construction experience can transform your space into exactly what you envision.

"I had the pleasure of working with HomeKeep to complete the backsplash in my kitchen. Jeremy was so helpful in providing me with the best selection of materials and extremely talented, fast, experienced installers. The pricing and quality were better than I could have imagined. I will definitely trust HomeKeep for my future projects. Thanks, everyone!"

Rebecca P on March 2021

Choosing HomeKeep Builders means partnering with a team that truly listens to your needs and delivers results you can trust. We’re not just here to complete a project—we’re here to ensure your home reflects your vision with minimal hassle. Our clients choose us because we prioritize transparency, clear communication, and top-tier craftsmanship. You’ll never be left guessing; we keep you informed every step of the way, ensuring your goals are met on time and within budget. Whether you’re looking to remodel or build new, HomeKeep is as invested in your home as you are. Let us show you how a seamless construction experience can transform your space into exactly what you envision.

"I had the pleasure of working with HomeKeep to complete the backsplash in my kitchen. Jeremy was so helpful in providing me with the best selection of materials and extremely talented, fast, experienced installers. The pricing and quality were better than I could have imagined. I will definitely trust HomeKeep for my future projects. Thanks, everyone!"

Rebecca P on March 2021


Avatar for IJH Construction, Inc.

IJH Construction, Inc.

110 W Avenida Cordoba
New on HomeAdvisorNew on HomeAdvisor
Approved Pro

IJH Construction, Inc.

110 W Avenida Cordoba
New on HomeAdvisorNew on HomeAdvisor
Approved Pro
24 years of experience
Free onsite estimate

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.


Avatar for Elias Amparano Remodeling

Elias Amparano Remodeling

3752 Costa Del Rey
5.00(
2
)
Approved Pro

Elias Amparano Remodeling

3752 Costa Del Rey
5.00(
2
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
10 years of experience

Licensed Contractor, we are a small company but deliver big results, let us give you a quality project for less. We offer 12 month 0 % financing OAC. We accept all major credit cards. We also handle all insurance loss claims with our own in house adjuster. Call us before or after a lose and let us get you what you deserve, before you say yes, let us give you a second opinion we have acquired our customers thousands of dollars more on their claims.

"Easy to work with, fantastic results. The finish on our saltillo tile floors had badly deteriorated and they were able to ressurect it. And their price was quite reasonable."

Ric W on November 2023

Licensed Contractor, we are a small company but deliver big results, let us give you a quality project for less. We offer 12 month 0 % financing OAC. We accept all major credit cards. We also handle all insurance loss claims with our own in house adjuster. Call us before or after a lose and let us get you what you deserve, before you say yes, let us give you a second opinion we have acquired our customers thousands of dollars more on their claims.

"Easy to work with, fantastic results. The finish on our saltillo tile floors had badly deteriorated and they were able to ressurect it. And their price was quite reasonable."

Ric W on November 2023


Pacific Pipeline

67 Bentwood Ln
New on HomeAdvisorNew on HomeAdvisor
Approved Pro

Pacific Pipeline

67 Bentwood Ln
New on HomeAdvisorNew on HomeAdvisor
Approved Pro
17 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.


Avatar for Finish Jobs Construction

Finish Jobs Construction

32726 Wesley Street
5.00(
10
)
Approved Pro

Finish Jobs Construction

32726 Wesley Street
5.00(
10
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
20 years of experience

Finish Jobs Construction focuses on customer service and building long-term relationships. We uphold a standard of integrity bound by fairness, honesty, and responsibility in all of our jobs. We are a locally owned and operated business with more than 13 years of experience serving Wildomar and surrounding areas. There is no job too big or too small for our team.

"Awesome experience. I will hire them for all my future projects. You should too, you will not regret it. They saved me a lot of money by repairing items that other companies wanted to replace. A++"

Desmond B on September 2021

Finish Jobs Construction focuses on customer service and building long-term relationships. We uphold a standard of integrity bound by fairness, honesty, and responsibility in all of our jobs. We are a locally owned and operated business with more than 13 years of experience serving Wildomar and surrounding areas. There is no job too big or too small for our team.

"Awesome experience. I will hire them for all my future projects. You should too, you will not regret it. They saved me a lot of money by repairing items that other companies wanted to replace. A++"

Desmond B on September 2021


Avatar for Socal Express Restoration and Construction Inc.

Socal Express Restoration and Construction Inc.

6860 Canby Avenue, Suite 114
New on HomeAdvisorNew on HomeAdvisor
Approved Pro

Socal Express Restoration and Construction Inc.

6860 Canby Avenue, Suite 114
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


Opulent Design Build

9471 IRVINE CENTER DR, #150
5.00(
20
)
Approved Pro

Opulent Design Build

9471 IRVINE CENTER DR, #150
5.00(
20
)
Approved Pro
Customers say: Quick response
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
10 local quotes requested

Opulent Design Build . One point of contact from Start to Finish. Opulent Design Build takes the complicated process of home designing, building and remodeling and makes it an experience that you will love! There's no need to fear the design & construction process. Opulent Design Build personally handles every aspect of the construction process: design, engineering, site survey, permitting, construction and inspections. We are truly a "one-stop" design-build company.

"My wife and I were looking into adding some square footage to our home as well as remodel. We were going in circles trying to plan and budget and it honestly was one of the most stressful/hardest experiences of our marriage. That was until we stumbled upon Opulent. I do not remember how we found them, but man, I am so glad we did. Eddie and his whole team were OUTSTANDING throughout the whole process. They really made us feel like we were part of the Opulent Family as well as producing real results. They managed EVERYTHING just about perfectly. From dealing with the permit process to helping us figure out what we needed to fill our space with beautiful fixtures to actually getting the construction done. The preconstruction process was so simple thanks to their amazing team and construction flowed so smoothly. The field workers were respectful and clean every day. 10/10 cannot recommend enough. Thank you Opulent!!"

Shaun M on August 2025

Opulent Design Build . One point of contact from Start to Finish. Opulent Design Build takes the complicated process of home designing, building and remodeling and makes it an experience that you will love! There's no need to fear the design & construction process. Opulent Design Build personally handles every aspect of the construction process: design, engineering, site survey, permitting, construction and inspections. We are truly a "one-stop" design-build company.

"My wife and I were looking into adding some square footage to our home as well as remodel. We were going in circles trying to plan and budget and it honestly was one of the most stressful/hardest experiences of our marriage. That was until we stumbled upon Opulent. I do not remember how we found them, but man, I am so glad we did. Eddie and his whole team were OUTSTANDING throughout the whole process. They really made us feel like we were part of the Opulent Family as well as producing real results. They managed EVERYTHING just about perfectly. From dealing with the permit process to helping us figure out what we needed to fill our space with beautiful fixtures to actually getting the construction done. The preconstruction process was so simple thanks to their amazing team and construction flowed so smoothly. The field workers were respectful and clean every day. 10/10 cannot recommend enough. Thank you Opulent!!"

Shaun M on August 2025


Avatar for Prime Construction Services, Inc.

Prime Construction Services, Inc.

865 S. Milliken Ave., Unit A
5.00(
2
)
Approved Pro

Prime Construction Services, Inc.

865 S. Milliken Ave., Unit A
5.00(
2
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
12 years of experience

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! ************ VISIT OUR VIRTUAL TOUR ************** https://players.cupix.com/p/BEWLWLeq *************** COPY & PASTE THIS ADDRESS TO YOUR BROWSER

"Andrew Farias was very professional. He was extremely detailed and finished my ADU right within out agreed price. Andrew was always available to answer any questions and was always very responsive to my emails and texts. He kept me well informed at each phase of my project. The quality of his work was top notch and i feel he went above and beyond. My ADU turned out better than i could have imagined and i would absolutely hire him again. I highly recommend Andrew and Prime Construction ."

Kimberly N on March 2022

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! ************ VISIT OUR VIRTUAL TOUR ************** https://players.cupix.com/p/BEWLWLeq *************** COPY & PASTE THIS ADDRESS TO YOUR BROWSER

"Andrew Farias was very professional. He was extremely detailed and finished my ADU right within out agreed price. Andrew was always available to answer any questions and was always very responsive to my emails and texts. He kept me well informed at each phase of my project. The quality of his work was top notch and i feel he went above and beyond. My ADU turned out better than i could have imagined and i would absolutely hire him again. I highly recommend Andrew and Prime Construction ."

Kimberly N on March 2022


Avatar for Dream Oasis Builders

Dream Oasis Builders

74-710 California 111
5.00(
19
)
Approved Pro

Dream Oasis Builders

74-710 California 111
5.00(
19
)
Approved Pro
Free onsite estimate
Emergency services offered

Dream Oasis Builders is a premier design-build remodeling firm specializing in luxury kitchens, spa bathrooms, ADUs, and full-home renovations. We deliver high-end craftsmanship and inspired design tailored to your lifestyle, from concept to completion. We bring your project over 30 years of combined experience. Based in the Coachella Valley, we proudly serve homeowners in Palm Springs, Palm Desert, La Quinta, Rancho Mirage, Cathedral City, and Indian Wells — creating stunning, functional spaces that enhance both beauty and value. Whether you're remodeling your forever home or building a serene short-term rental, we bring your vision to life — on time, on budget, and beyond expectations.

"I couldn’t be happier with the transformation of my garage into a beautiful, functional living space! From start to finish, the team was professional, communicative, and attentive to every detail. They listened to my ideas, offered creative suggestions, and delivered a result that exceeded my expectations. The craftsmanship is top-notch — every corner looks flawless, and the finishes are absolutely stunning. What I appreciated most was how smoothly the whole process went. They kept the project on schedule, stayed within budget, and left my home spotless at the end of each day. Now I have a gorgeous new space that adds value to my home and perfectly fits my lifestyle. If you’re considering a garage conversion in La Quinta, I highly recommend them — you’ll be thrilled with the results! "

Ezra P on September 2025

Dream Oasis Builders is a premier design-build remodeling firm specializing in luxury kitchens, spa bathrooms, ADUs, and full-home renovations. We deliver high-end craftsmanship and inspired design tailored to your lifestyle, from concept to completion. We bring your project over 30 years of combined experience. Based in the Coachella Valley, we proudly serve homeowners in Palm Springs, Palm Desert, La Quinta, Rancho Mirage, Cathedral City, and Indian Wells — creating stunning, functional spaces that enhance both beauty and value. Whether you're remodeling your forever home or building a serene short-term rental, we bring your vision to life — on time, on budget, and beyond expectations.

"I couldn’t be happier with the transformation of my garage into a beautiful, functional living space! From start to finish, the team was professional, communicative, and attentive to every detail. They listened to my ideas, offered creative suggestions, and delivered a result that exceeded my expectations. The craftsmanship is top-notch — every corner looks flawless, and the finishes are absolutely stunning. What I appreciated most was how smoothly the whole process went. They kept the project on schedule, stayed within budget, and left my home spotless at the end of each day. Now I have a gorgeous new space that adds value to my home and perfectly fits my lifestyle. If you’re considering a garage conversion in La Quinta, I highly recommend them — you’ll be thrilled with the results! "

Ezra P on September 2025


Avatar for CASSINI CONSTRUCTION

CASSINI CONSTRUCTION

502 W 1st St
5.00(
6
)
Approved Pro

CASSINI CONSTRUCTION

502 W 1st St
5.00(
6
)
Approved Pro
13 local quotes requested
20 years of experience

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

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FAQs for addition to existing structure building service projects in Lake Forest, 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 Lake Forest, 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.