Top-rated basement waterproofing pros.

Get matched with top basement waterproofing pros in Rancho Santa Margarita, CA

There are 4 highly-rated local basement waterproofing pros.

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Verified Reviews for Basement Waterproofing pros in Rancho Santa Margarita, CA

*The Angi rating for Basement Waterproofing companies in Rancho Santa Margarita, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Basement Waterproofing needs.

*The HomeAdvisor rating for Basement Waterproofing companies in Rancho Santa Margarita, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Basement Waterproofing needs.

Last update on November 12, 2025

Find Basement waterproofing pros in Rancho Santa Margarita

Avatar for Alpha Structural, Inc.

Alpha Structural, Inc.

4.67(
231
)
•Approved Pro

Alpha Structural, Inc.

4.67(
231
)
•Approved Pro
Customers say: Super punctual
199 local quotes requested
33 years of experience

Alpha Structural, Inc. has over 850 years of combined technical experience in Foundation and Hillside Repair. All of our experience is hard-core and down-in-the-trenches – not managed from behind a computer. Our in-house engineers and technicians are among the most experienced in all of Southern California. Alpha Structural, Inc. is the ONLY company in the SOCAL area licensed to ENGINEER and BUILD any type of repair project. That means that you'll work with us through the whole project, not unknown sub-contractors that you didn't hire and cannot control or predict. Alpha Structural, Inc. a licensed, bonded, and insured contractor (license # 663409). We are licensed with the following classifications: A (General Engineering Contractor). B (General Building Contractor). C-8 (Concrete). HIC (Home Improvement Contractor). CALL US NOW FOR AN INSPECTION OR ESTIMATE! (323)258-5482.

"I worked with Alpha once before, and they assisted with a second project 2 years ago which, now finally completed, I'm able to write a review about. Alpha helped with structural plans for windows in a garden level unit in order to prepare the proposal for city approval. Alpha is a big company and it took them a little while to complete everything; however I can certainly say that the engineer and contact people were knowledgeable and thorough. The plans were approved with their help and now that the unit is permitted for occupancy, the windows are a lovely attribute to the space."

Robert N on September 2024

Alpha Structural, Inc. has over 850 years of combined technical experience in Foundation and Hillside Repair. All of our experience is hard-core and down-in-the-trenches – not managed from behind a computer. Our in-house engineers and technicians are among the most experienced in all of Southern California. Alpha Structural, Inc. is the ONLY company in the SOCAL area licensed to ENGINEER and BUILD any type of repair project. That means that you'll work with us through the whole project, not unknown sub-contractors that you didn't hire and cannot control or predict. Alpha Structural, Inc. a licensed, bonded, and insured contractor (license # 663409). We are licensed with the following classifications: A (General Engineering Contractor). B (General Building Contractor). C-8 (Concrete). HIC (Home Improvement Contractor). CALL US NOW FOR AN INSPECTION OR ESTIMATE! (323)258-5482.

"I worked with Alpha once before, and they assisted with a second project 2 years ago which, now finally completed, I'm able to write a review about. Alpha helped with structural plans for windows in a garden level unit in order to prepare the proposal for city approval. Alpha is a big company and it took them a little while to complete everything; however I can certainly say that the engineer and contact people were knowledgeable and thorough. The plans were approved with their help and now that the unit is permitted for occupancy, the windows are a lovely attribute to the space."

Robert N on September 2024

Avatar for Jrd construction

Jrd construction

5.00(
2
)

Jrd construction

5.00(
2
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

JRD Construction is located in Los Angeles, California and is proud to be Los Angeles leader among home remodeling contractors. We offer high quality materials and craftsmanship for all your home remodeling needs. With over 22 years of residential and commercial remodeling experience, JRD Construction has the expertise for your home improvement project!

"This company is an amazing company From the first meeting the guy was so nice and knowledgeable He helped me understand what was my problem and what are the possible solutions. would highly recommand!"

Orel L on December 2023

JRD Construction is located in Los Angeles, California and is proud to be Los Angeles leader among home remodeling contractors. We offer high quality materials and craftsmanship for all your home remodeling needs. With over 22 years of residential and commercial remodeling experience, JRD Construction has the expertise for your home improvement project!

"This company is an amazing company From the first meeting the guy was so nice and knowledgeable He helped me understand what was my problem and what are the possible solutions. would highly recommand!"

Orel L on December 2023

RocFlooring

No reviews yet

RocFlooring

No reviews yet

Decorative and Industrial flooring. Repairs, polishing and coatings for garage, patio, deck, warehouse. Anaheim, Orange County. Factory trained, professional application at a very low price. I also do commercial waterproofing, and heavy duty floors for auto shops, warehouses, food grade and craft brewers. I only use USA made products that are environmentally safe. Licensed and insured general contractor for OC, Los Angeles, and Inland Empire.

Decorative and Industrial flooring. Repairs, polishing and coatings for garage, patio, deck, warehouse. Anaheim, Orange County. Factory trained, professional application at a very low price. I also do commercial waterproofing, and heavy duty floors for auto shops, warehouses, food grade and craft brewers. I only use USA made products that are environmentally safe. Licensed and insured general contractor for OC, Los Angeles, and Inland Empire.

Avatar for Home Remodeling By Treeium Inc - Orange Co

Home Remodeling By Treeium Inc - Orange Co

4.63(
24
)

Home Remodeling By Treeium Inc - Orange Co

4.63(
24
)
Customers say: Quality work
34 years of experience

Treeium is the leading household name in the home improvement and design industry. We are leading by our high level of integrity, innovation, customer’s satisfaction and technology while providing unmatched service, selection, convenience and consideration. We are a team of experienced experts who are happy to come to work, who feel respected and are committed to making sure that every customer feels special. We guarantee customer satisfaction by our financial strength, transparency and full project visibility through our unique and innovative technology. We are committed to serving our communities by providing sustainable, ecofriendly remodels and energy solutions that benefit both the consumer and the planet. In addition, we help beautify the planet and offset our carbon footprint by planting a tree with every completed project. With Treeium, your home improvement project is more than a simple remodeling… it's a #Change4Better!

"Treeium recently completed the remodel of a portion of my home and a detached garage to create two apartments (ADUs). Unfortunately, my experience was very negative and fraught with tension, disagreement, and arguments. Most importantly, the project was scheduled to be completed in 3.5 months but took over 7 months to complete, without a reasonable cause for the delay. Additionally, they repeatedly touted their years of experience and expertise, which caused me great concern when I discovered that their contract’s payment schedule forced me to pay large sums of money for work that had not been completed. On a positive note, their sales pitch and marketing are exceptional."

Neal W on February 2022

Treeium is the leading household name in the home improvement and design industry. We are leading by our high level of integrity, innovation, customer’s satisfaction and technology while providing unmatched service, selection, convenience and consideration. We are a team of experienced experts who are happy to come to work, who feel respected and are committed to making sure that every customer feels special. We guarantee customer satisfaction by our financial strength, transparency and full project visibility through our unique and innovative technology. We are committed to serving our communities by providing sustainable, ecofriendly remodels and energy solutions that benefit both the consumer and the planet. In addition, we help beautify the planet and offset our carbon footprint by planting a tree with every completed project. With Treeium, your home improvement project is more than a simple remodeling… it's a #Change4Better!

"Treeium recently completed the remodel of a portion of my home and a detached garage to create two apartments (ADUs). Unfortunately, my experience was very negative and fraught with tension, disagreement, and arguments. Most importantly, the project was scheduled to be completed in 3.5 months but took over 7 months to complete, without a reasonable cause for the delay. Additionally, they repeatedly touted their years of experience and expertise, which caused me great concern when I discovered that their contract’s payment schedule forced me to pay large sums of money for work that had not been completed. On a positive note, their sales pitch and marketing are exceptional."

Neal W on February 2022

Avatar for Omega Structural, Inc.

Omega Structural, Inc.

5.00(
3
)

Omega Structural, Inc.

5.00(
3
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

Have foundation issues with your home? Los Angeles, California has had approximately, 4,000 earthquakes since 1932. It has a very high earthquake risk, and as a home owner, the structure of your homes should be in great hands. That’s why we are here! Omega Structural, Inc. is a bonded, insured and licensed company that is qualified to fix your soft story building, home foundation issues, earthquake bolting, retrofit, hillside repair, caissons, underpinning pads, waterproofing, French drains and swales, to keep the water away from your home. Please call us if you are noticing; windows & doors not closing like they used to, cracks on your floor/ floor tiles/or foundation, flaws or cracks in exterior walls of your home and/or uneven floors as these all can be indicators of a foundation problem.

"They do fantastic work,and follow their schedule."

Darrent G on September 2018

Have foundation issues with your home? Los Angeles, California has had approximately, 4,000 earthquakes since 1932. It has a very high earthquake risk, and as a home owner, the structure of your homes should be in great hands. That’s why we are here! Omega Structural, Inc. is a bonded, insured and licensed company that is qualified to fix your soft story building, home foundation issues, earthquake bolting, retrofit, hillside repair, caissons, underpinning pads, waterproofing, French drains and swales, to keep the water away from your home. Please call us if you are noticing; windows & doors not closing like they used to, cracks on your floor/ floor tiles/or foundation, flaws or cracks in exterior walls of your home and/or uneven floors as these all can be indicators of a foundation problem.

"They do fantastic work,and follow their schedule."

Darrent G on September 2018

Avatar for Los Angeles Retrofit & Construction Inc

Los Angeles Retrofit & Construction Inc

5.00(
6
)

Los Angeles Retrofit & Construction Inc

5.00(
6
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

We believe our retrofit, remodeling and construction services will give you the best outcome and give you the most value from your property investment. When you work with LARC, you work with the principles of the company from start to finish. Whether you are a concerned home owner, potential home buyer or just want to ask us few questions about your foundation, LARC can help.

We believe our retrofit, remodeling and construction services will give you the best outcome and give you the most value from your property investment. When you work with LARC, you work with the principles of the company from start to finish. Whether you are a concerned home owner, potential home buyer or just want to ask us few questions about your foundation, LARC can help.

Avatar for C & L Construction

C & L Construction

4.83(
23
)

C & L Construction

4.83(
23
)
Customers say: Super punctual
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers

Home Improvement company. We do kitchens, bathrooms, roofing, painting, windows, new construction, and much more!

"I am so glad I found C &L Construction for my remodel ! The team was always on time , responsive , and worked in the timeline they promised ! I had a complete remodel done for a single family home and their work was flawless!!!"

Ani B on August 2019

Home Improvement company. We do kitchens, bathrooms, roofing, painting, windows, new construction, and much more!

"I am so glad I found C &L Construction for my remodel ! The team was always on time , responsive , and worked in the timeline they promised ! I had a complete remodel done for a single family home and their work was flawless!!!"

Ani B on August 2019

Green Improvement Remodeling

5.00(
5
)

Green Improvement Remodeling

5.00(
5
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

We are a California-based green incentive home improvement company. We work with homeowners for utilities savings and general home construction . We are a "B general contractor" which means we are licensed to do both green incentive remodeling as well as general home improvement projects

We are a California-based green incentive home improvement company. We work with homeowners for utilities savings and general home construction . We are a "B general contractor" which means we are licensed to do both green incentive remodeling as well as general home improvement projects

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Basement Waterproofing questions, answered by experts

The best type of basement ventilation system depends on your budget, the moisture in your basement’s air, and the types of windows you have down there. You should consider all of these factors when choosing a ventilation system. However, the most effective method for basement ventilation is an energy recovery ventilator (ERV) or a whole-house ventilation system, which preheats or precools incoming air from the outside while also managing water vapor.

Basements are commonly converted into game rooms. The potential challenges you may run into include controlling moisture, working with low ceilings, limited natural light, and the need for additional electrical or HVAC work. Addressing these issues can add to the total cost, but it ensures a comfortable and functional space.

Methods include interior sealants, exterior excavation and waterproofing membranes, sump pump installation, and vapor barriers for encapsulation. Techniques vary based on the structure and severity of moisture issues.

One handy thing about whole-house dehumidifiers is, once installed, you don’t have to worry about placement or changing the dehumidifier’s position. But if you are using a portable dehumidifier, we suggest keeping it away from walls, vents, and furniture. It needs a central, unobstructed spot with access to lots of air to do its job.

“Basement waterproofing” sometimes refers to applying a waterproof sealant to basement walls, in which case you would use a waterproof paint, often made of latex. However, there are many methods you can use to waterproof a basement, including exterior drainage systems, interior drainage systems, dehumidifiers, and more. As such, the materials you use can vary depending on the methods you use.

The Rancho Santa Margarita, CA homeowners’ guide to basement waterproofing services

From average costs to expert advice, get all the answers you need to get your job done.

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