Top-rated basement waterproofing pros.

Best basement waterproofing pros near Altadena, CA

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Top-Rated Basement waterproofing pros in Altadena - Updated Nov 2026

Avatar for Alpha Structural, Inc.
Alpha Structural, Inc.
4.6(
241
)
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Altadena, CA and surrounding areas

Approved (Corporate)

In business since 1992

Free estimates

Emergency services offered

"Erinn was my initial contact and he gave a very through and fair estimate. We had structural work done to support floor joists and large beams under the garage that needed replacing. Ernesto and his team, Julio, Salvatore and Gilder worked tirelessly to complete the work and were respectful, punctual, informative and good humoured throughout the entire process. I would not hesitate to use them again or recommend them to others. A really great company!!"
Basement Addition
Basement Expansion
Caisson Supported Retaining Wall
Cantilevered Deck Design Build
Deck Expansion and Slope Failure with Retaining Wall

+323

Response time10 hrs
Response rate100%
11 neighbors recently requested a quote
Avatar for Western Rooter & Plumbing
Western Rooter & Plumbing
4.8(
172
)
Basement Drainage Channels - Install

Serving Altadena, CA and surrounding areas

Approved

In business since 1981

Free estimates

Emergency services offered

"I had my tankless water heater serviced by Daniel W. Daniel was throughly professional during his entire visit. I would highly recommend Wester Rooter for all of your plumbing needs."
Ruben installs a new drainage system under a customers home. Working in a crawl space is rough, but we do what is needed.
Backing up? Got roots? Blast those roots out with a Hydro Jetter! We use a wart hog nozzle that combines controlled rotation with a unique 8 jet cutting configuration optimized for removing roots. It’s better with a jetter! Call us! We got this! ??
Sewer Line Camera
No drain clog too big or small, Western Rooter covers them all!
Justin clearing a Kitchen sink back-up after the Memorial holiday.
HALO 5 whole house water filtration system.

+542

Response time12 hrs
Response rate100%
10 neighbors recently requested a quote
Avatar for Ideal Plumbing Inc.
Ideal Plumbing Inc.
5.0(
21
)
Basement Drainage Channels - Install

Serving Altadena, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2011

Free estimates

Warranties offered

"Samuel is the best. We had water bubbling in the ceiling (never a good sign), and he was able to help us find a contractor to remove and replace the smallest part of the ceiling needed to address the leak. He was honest, prompt and most importantly - did a great job. Thanks Sam!"
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+1

Response time7 hrs
Response rate100%
Recommended by66%of homeowners
Avatar for Saber
Saber
3.6(
148
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Altadena, CA and surrounding areas

Approved

In business since 1986

Free estimates

Warranties offered

"This company is great. The men that installed my equipment were very quick and cleaned up after themselves. The estimate was free and I was guaranteed that price for an entire year so I wasn't forced to make the decision right away. I was so upset when I found out my foundation was settling. It was definitely an expensive fix but worth it. It was getting to the point where I couldn't shut doors because they weren't lined up with the frames anymore. Now I have jacks that can be adjusted at anytime without needing to spend any more money."
REIG Operation Renovation
REIG Operation Renovation
REIG Operation Renovation
REIG Operation Renovation
REIG Operation Renovation

+35

Response time1 day
5 neighbors recently requested a quote
Recommended by75%of homeowners
RSF Construction Inc.
1.0(
1
)
Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Altadena, CA and surrounding areas

Approved

In business since 2019

Free estimates

Credit card accepted

RSF Construction Inc. is a leader in providing our customers with the highest quality service in an honest, efficient, and professional way. Our pledge is to create successful relationships with our customers, employees and community by building trust, treating every project with the utmost integrity and exceeding expectations. We look forward to working with you!

Palm Construction, Inc.
5.0(
112
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Altadena, CA and surrounding areas

In business since 2016

Free estimates

Credit card accepted

It can be a daunting task looking for not only the right contractor for your job but also the right contractor for you. We completely understand what you're going through. We know every customer has different desires, different needs and different schedules. We're not only here to turn your ideas into reality but to make it a memorable experience every step of the way. Call us right now, no matter where you are in the planning process.

Recommended by100%of homeowners
Palm Construction, Inc.
5.0(
90
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Altadena, CA and surrounding areas

In business since 2016

Free estimates

Credit card accepted

"We worked with Ali (sales manager) and Tony (project manager), who took the time to design a project that made sense for our property and our budget, made a number of suggestions and recommendations and were never pushy or tried to "sell" us on something. The crew really went above and beyond to provide top quality workmanship and overall we were in very good hands. Highly recommended!"
Recommended by100%of homeowners
Avatar for BG Construction & Remodeling Inc
BG Construction & Remodeling Inc
4.9(
51
)
Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Altadena, CA and surrounding areas

In business since 1985

Free estimates

Emergency services offered

"Joseph is amazing. We have used him many times for years for multiple home projects including remodeling a bathroom, new siding on the house, new roofing, plumbing repairs (and emergencies). He has always responded quickly, his work has been excellent, the site is always left immaculate, his crew are always on time and very pleasant. Joseph's work is outstanding and we have never had any issues. He has helped us out fixing issues that predated him also promptly and done to only his high standards. We can not recommend him high enough and will use him for many years to come."
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Kitchens 1
Kitchens 2

+19

Recommended by100%of homeowners
Avatar for Home Builders Pro
Home Builders Pro
4.8(
109
)
Basement Drainage Channels - Install

Serving Altadena, CA and surrounding areas

In business since 2007

Free estimates

Credit card accepted

"We had a major water leak After dry out we needed a company to re build our home Armscraft Construction was refereed to us by a company we used for water mitigation We contacted Armscraft and ask them to come out and give us an estimate We got 3 estimates and end up hiring Armscraft Everything went great We are very happy with final results. Will highly recommend to anyone who need help with Construction projects"
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+76

Recommended by100%of homeowners
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Basement Waterproofing FAQs, answered by experts

Yes, outside leaks can easily cause damage to your home if you don’t have waterproofing measures in place. Regularly check your property for signs of a leak, ensure your home’s landscaping is at least at a 5% slope, your basement windows are sealed, and you have an aligned gutter system to catch rainwater.

Flooded basement cleanup can take anywhere from a few days to several weeks, depending on the extent of water damage, the type of water involved, and the need for repairs or mold remediation. Severe cases with structural damage or extensive mold may require longer timelines. Quick action and professional help can speed up the process and reduce overall damage.

The most flood-resistant materials you can count on in a flood scenario are concrete, closed-cell insulation, foam insulation (also known as expandable foam), pressure-treated wood, marine-grade plywood, and ceramic tile. When a material is flood-resistant, it can withstand direct contact with floodwater for at least 72 hours without being significantly damaged.

The most cost-effective foundation repair is using masonry patches and sealants to seal foundation cracks and offer some support to prevent further damage. These methods are used to fix minor foundation cracks quickly. However, they’re not suitable as a long-term solution, and they only offer minimal stability. On average, masonry patches and sealants cost $500, but a sealant like an epoxy crack injection can total over $2,000. If you’re handy and only looking for a temporary solution until you contact a local foundation repair contractor for a more permanent one, you can save hundreds by DIYing this repair.

There are a few downsides to a wet room, the most important of which is the risk of mold growth from the moisture and humidity. Standard bathrooms can have the same issue, but wet rooms are more likely to experience problems because water is less carefully contained. You also have less privacy since the entire bathroom is open, and the room must include waterproofing, which makes wet rooms more expensive to install than regular bathrooms.

The Altadena, CA homeowners’ guide to basement waterproofing services

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