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Verified Reviews for Basement Waterproofing pros in Knightsen, CA

*The Angi rating for Basement Waterproofing companies in Knightsen, 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 Knightsen, 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 October 29, 2025

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Avatar for Groundworks

Groundworks

2333 Courage Dr Ste C
4.33(
12
)
•Approved Pro

Groundworks

2333 Courage Dr Ste C
4.33(
12
)
•Approved Pro
Customers say: Quality work
58 local quotes requested
20 years of experience

Groundworks, formerly Bay Area Underpinning, specializes in helping homeowners with their residential and commercial foundation repair and concrete needs. Our top priority is providing high-quality home repair solutions and personalized service across the Sacramento and San Jose areas. With fully trained technicians, industry-leading products, and nationally backed warranties, Groundworks is here to restore your foundation. Schedule your FREE inspection today! 1116054

"We hired Groundworks CA (fka Bay Area Underpinning) for what we understood was a full foundation repair. We paid $42K. They only worked on the rear and never informed us that the front wasn’t included. Months later, while selling our home, a third-party engineer found $189K in unaddressed issues at the front. We were blindsided, lost our buyer, and suffered major financial and emotional stress. Groundworks later admitted they hadn’t measured the front. Their rushed “final inspection” months later felt reactive, not professional. When asked for a partial refund, they refused. We feel misled and abandoned. Avoid."

Dominick M on June 2025

Groundworks, formerly Bay Area Underpinning, specializes in helping homeowners with their residential and commercial foundation repair and concrete needs. Our top priority is providing high-quality home repair solutions and personalized service across the Sacramento and San Jose areas. With fully trained technicians, industry-leading products, and nationally backed warranties, Groundworks is here to restore your foundation. Schedule your FREE inspection today! 1116054

"We hired Groundworks CA (fka Bay Area Underpinning) for what we understood was a full foundation repair. We paid $42K. They only worked on the rear and never informed us that the front wasn’t included. Months later, while selling our home, a third-party engineer found $189K in unaddressed issues at the front. We were blindsided, lost our buyer, and suffered major financial and emotional stress. Groundworks later admitted they hadn’t measured the front. Their rushed “final inspection” months later felt reactive, not professional. When asked for a partial refund, they refused. We feel misled and abandoned. Avoid."

Dominick M on June 2025

Avatar for Groundworks

Groundworks

2333 Courage Dr STE C
5.00(
2
)
•Approved Pro

Groundworks

2333 Courage Dr STE C
5.00(
2
)
•Approved Pro
143 local quotes requested
2 years of experience

Groundworks specializes in helping homeowners with their residential and commercial foundation repair and concrete needs. Our top priority is providing high-quality home repair solutions and personalized service across the Sacramento area. With fully trained technicians, industry-leading products, and nationally backed warranties, Groundworks is here to restore your foundation.

"Juanpablo H. & Alex C. provided excellent service. Their knowledge and transparency gave me all the confidence that they?re the best persons for the job. Transparency is a major trust driver for me, and their ability to have frank and informative discussion earned my loyalty. Thank you both! "

Sam _ on May 2025

Groundworks specializes in helping homeowners with their residential and commercial foundation repair and concrete needs. Our top priority is providing high-quality home repair solutions and personalized service across the Sacramento area. With fully trained technicians, industry-leading products, and nationally backed warranties, Groundworks is here to restore your foundation.

"Juanpablo H. & Alex C. provided excellent service. Their knowledge and transparency gave me all the confidence that they?re the best persons for the job. Transparency is a major trust driver for me, and their ability to have frank and informative discussion earned my loyalty. Thank you both! "

Sam _ on May 2025

Avatar for Sears Home Services

Sears Home Services

3.91(
195
)

Sears Home Services

3.91(
195
)
Customers say: Super punctual
69 years of experience

Sears Home Services is America’s #1 appliance services provider. Our thousands of experts based throughout the U.S. deliver guaranteed quality and workmanship. We work on most makes and models whether they were purchased at Sears or not. We take care of your house so you can enjoy your home. Only Sears offers 3 unique ways to save on appliance repairs! 1. Standard Repair Service + 90 Day Guarantee • Cost is provided after technician diagnoses the problem • 90 day guarantee on parts and labor* 2. Flat Repair Cost + Extended Repair Coverage • $249.99 or $299.99 pre-set price (depending on type of appliance) • 1 year of coverage up to $500 for any additional repairs (includes parts)** 3. Flat Repair Cost + Multiple Appliance Coverage • $129.99 for your initial repair with purchase of Home Warranty Appliance Plan • 1 year of repair coverage for up to 10 appliances with 11 subsequent monthly payments of $49.99*** Book your appointment with a Sears expert technician today! * 90 Day Guarantee: The limited warranty provides that if within 90 days from the date of your Sears in-home repair your appliance fails to operate for reasons related to the original repair service when used normally in accordance with manufacturer guidelines, we will replace any parts that failed due to defects in the material or workmanship and perform any labor related to the original repair free of charge. Excludes damage caused due to service provided by any party other than Sears. This warranty gives you specific legal rights, and you may have other rights that vary by state. ** Appliance must be less than 10 years old to qualify for Service Smart Agreement. Covers up to $500 in parts and labor. Limitations apply. *** Limitations apply” Contact Name - Eric Wood.

"It was okay, he was a gentlemen. I was happy."

Rose E on January 2020

Sears Home Services is America’s #1 appliance services provider. Our thousands of experts based throughout the U.S. deliver guaranteed quality and workmanship. We work on most makes and models whether they were purchased at Sears or not. We take care of your house so you can enjoy your home. Only Sears offers 3 unique ways to save on appliance repairs! 1. Standard Repair Service + 90 Day Guarantee • Cost is provided after technician diagnoses the problem • 90 day guarantee on parts and labor* 2. Flat Repair Cost + Extended Repair Coverage • $249.99 or $299.99 pre-set price (depending on type of appliance) • 1 year of coverage up to $500 for any additional repairs (includes parts)** 3. Flat Repair Cost + Multiple Appliance Coverage • $129.99 for your initial repair with purchase of Home Warranty Appliance Plan • 1 year of repair coverage for up to 10 appliances with 11 subsequent monthly payments of $49.99*** Book your appointment with a Sears expert technician today! * 90 Day Guarantee: The limited warranty provides that if within 90 days from the date of your Sears in-home repair your appliance fails to operate for reasons related to the original repair service when used normally in accordance with manufacturer guidelines, we will replace any parts that failed due to defects in the material or workmanship and perform any labor related to the original repair free of charge. Excludes damage caused due to service provided by any party other than Sears. This warranty gives you specific legal rights, and you may have other rights that vary by state. ** Appliance must be less than 10 years old to qualify for Service Smart Agreement. Covers up to $500 in parts and labor. Limitations apply. *** Limitations apply” Contact Name - Eric Wood.

"It was okay, he was a gentlemen. I was happy."

Rose E on January 2020

SERVPRO San Mateo

63 Bovet Rd # 149
4.50(
2
)

SERVPRO San Mateo

63 Bovet Rd # 149
4.50(
2
)
Customers say: Terrific value
55 years of experience

SERVPRO of San Mateo is a trusted leader in the restoration industry and has the training, equipment, and expertise to handle your restoration and cleaning needs. As a locally owned and operated business, we can provide 24-hour emergency service and are dedicated to responding immediately to commercial or residential needs.

"Water line was replaced by plumbing company. Servepro came promptly at the agreed time. I had cleaned up a lot but water was still coming up from under linoleum. I told the man where it was still a problem and he set up three noisy blowers without wiping up remaining puddles first. He told me he would return between ten and eleven next day. When he didn't I phoned the office and they said it wasn't scheduled but they let me shut off the noisy blowers. After several calls they came about 2PM. I hate to think what my electricity bill will be. They billed my insurance company since I had a claim #."

Anita L on November 2019

SERVPRO of San Mateo is a trusted leader in the restoration industry and has the training, equipment, and expertise to handle your restoration and cleaning needs. As a locally owned and operated business, we can provide 24-hour emergency service and are dedicated to responding immediately to commercial or residential needs.

"Water line was replaced by plumbing company. Servepro came promptly at the agreed time. I had cleaned up a lot but water was still coming up from under linoleum. I told the man where it was still a problem and he set up three noisy blowers without wiping up remaining puddles first. He told me he would return between ten and eleven next day. When he didn't I phoned the office and they said it wasn't scheduled but they let me shut off the noisy blowers. After several calls they came about 2PM. I hate to think what my electricity bill will be. They billed my insurance company since I had a claim #."

Anita L on November 2019

Avatar for All Bay Air Duct Cleaning

All Bay Air Duct Cleaning

1725 Rogers Ave
No reviews yet

All Bay Air Duct Cleaning

1725 Rogers Ave
No reviews yet
12 years of experience

We offer all types of home insulation solutions. It includes crawl space insulation and vapor barriers, wall insulation, batts and blown-in attic insulation, air sealant for attic and crawl space, and radiant barrier. We specialize in air duct deep cleaning and replacement, furnace deep cleanings, duct leakage testing, rodent proofing, crawl space and attic clean up.

We offer all types of home insulation solutions. It includes crawl space insulation and vapor barriers, wall insulation, batts and blown-in attic insulation, air sealant for attic and crawl space, and radiant barrier. We specialize in air duct deep cleaning and replacement, furnace deep cleanings, duct leakage testing, rodent proofing, crawl space and attic clean up.

Wilkinson Design+Construction Inc.

72 Clayton Street
No reviews yet

Wilkinson Design+Construction Inc.

72 Clayton Street
No reviews yet
36 years of experience

Wilkinson Design & Construction, Inc CA State Lic. # 564598 72 Clayton Street San Rafael, CA 94901 phone: 415.785.7961 cell: 415.450.1845 fax: 415.226.0561 E-mail: [email protected] Webstite: www.WilkinsonDesign.net

Wilkinson Design & Construction, Inc CA State Lic. # 564598 72 Clayton Street San Rafael, CA 94901 phone: 415.785.7961 cell: 415.450.1845 fax: 415.226.0561 E-mail: [email protected] Webstite: www.WilkinsonDesign.net

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Basement Waterproofing questions, answered by experts

A vapor barrier keeps moisture out of the crawl space, while insulation reduces the amount of unconditioned air—and sometimes moisture—that enters the space. Coupling a vapor barrier with insulation can help prevent humidity and related moisture damage in a crawl space while also making your home more energy-efficient. Just be sure to use insulation that won’t get damaged from moisture, like rigid foam board or expanding spray foam insulation.

Your homeowners insurance can cover slab leak repairs, but it really depends on your policy. Some homeowners insurance policies only cover slab leaks caused by natural disasters, while other plans are more comprehensive. You might also want to check your home warranty plan to see if they'll cover the cost of the repairs if one of your appliances caused the leak.

Unfortunately, mold can grow pretty much anywhere, on any kind of surface. However, you’re most likely to see it in damp areas like basements or bathrooms, as well as anywhere there has been a water leak. Consult a local mold specialist to determine if certain areas of your home are prone to mold based on climate and other factors.

The best way to ensure the ground next to your home’s foundation drains properly is to divert water away from it as much as possible. While a flood wall can stop water from entering the house, gutters and spouts can help direct rainwater and melting snow away from the foundation. Keep your gutters as clear as possible from dead leaves and other yard debris so they can effectively divert water from your house. Add extenders to the spouts so the water runs out and away from your home, not into the surrounding soil.

Depending on the severity, a slab leak can go undetected for months or even years, especially if you don’t carry out routine foundation inspections to find foundation leaks early. However, minor leaks are likely to turn into more severe leaks over time, so you might notice increases in water bills and issues with yard drainage, even if the problem is minor.

The Knightsen, CA homeowners’ guide to basement waterproofing services

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