Top-rated basement waterproofing pros.

Best basement waterproofing pros near Williamstown, NY

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

Avatar for Woodford Bros., Inc.
Woodford Bros., Inc.
3.6(
36
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Williamstown, NY and surrounding areas

Approved

In business since 1995

Free estimates

Emergency services offered

"Great company to work with, very friendly knowledgeable people and customer satisfaction is their goal. Matt and his crew did a superb job restoring our finished basement after it got flooded when our sump pump had failed during heavy rains. Dual pumps were installed, along with waterproof and mold proof walls and flooring and a Sedona dehumidifier air purification system."
Company Photo 2018
Home of the Basement Bros
Wall cracks in bad shape
Wall fixed and safe
Before

+4

Response time2 hrs
44 neighbors recently requested a quote
Recommended by58%of homeowners
R Davies Construction
5.0(
17
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Williamstown, NY and surrounding areas

Approved

Super Service Award Winner

In business since 2015

Free estimates

Offers commercial services

"R Davies Construction delivered a flawless job that merits nothing less than an A+. They recently installed a 120 foot outdoor French drain on our property, and their execution was a masterclass in efficiency and professionalism. They arrived promptly, communicated with us clearly, and worked with meticulous attention to detail- and were also super friendly! What could have been a chaotic prose of mud and disruption was instead transformed into a beautifully structured, clean, and functional landscape. If you are looking for a contractor that understands the syntax of hard work and structural integrity, R Davies Construction is the definitive choice. Highly recommended!"
Response time5 hrs
Response rate98%
15 neighbors recently requested a quote
Avatar for Highlander Waterproofing Inc
Highlander Waterproofing Inc
5.0(
1
)
Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Williamstown, NY and surrounding areas

Approved

In business since 2011

Free estimates

Emergency services offered

At Highlander Waterproofing & Foundation Repair, we are the area's trusted experts specializing in basement and crawlspace waterproofing and encapsulation, along with foundation repair services for bowing and buckling walls, floor and wall cracks, and full foundation rebuilds to name a few. When you contact Highlander for a free inspection, you are choosing a BBB A+ Accredited, two-time Torch Award for Ethics Winner, with our most recent years 2021, 2022!

Response time1 day
Response rate100%
Over the Top Unlimited, Inc.
New to Angi
Basement Drainage Channels - Install

Serving Williamstown, NY and surrounding areas

Approved

In business since 2023

Free estimates

Credit card accepted

Over The Top Unlimited Inc. is a fully incorporated, licensed and insured excavation and proudly serving Parish, NY and the surrounding areas. Owned and operated by Michael Peters, the company brings over 20 years of hands-on industry experience to every residential and commercial project. \n \nWith a full fleet of heavy equipment and the expertise to handle projects of all sizes, Over The Top Unlimited Inc. specializes in excavation, septic system installation and replacement, foundations, basement and crawl space work, waterproofing, and encapsulation services. Whether preparing a site for new construction, replacing aging infrastructure, or solving drainage and foundation issues, Michael and his team deliver dependable workmanship built to last. \n \nFrom start to finish, clients can expect professionalism, efficiency, and quality results backed by decades of experience in the field. \n

4 neighbors recently requested a quote
Avatar for Midstate Basement Authorities, Inc
Midstate Basement Authorities, Inc
4.7(
39
)
Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Williamstown, NY and surrounding areas

In business since 2012

Free estimates

Warranties offered

"Eric and crew were great to work with on a big job they just finished for us replacing the entire foundation of an old house in Ithaca. The original foundation was in danger of collapse. Working with Taitem Engineering the crew at Midstate assessed the scope of the job and designed a fixed bid job to shore up the house, replace several joists and remove the old foundation walls. Along the way the entire HVAC system had to be removed and put back and plumbing and electrical had to be changed across the basement. The house looked like it was being raised up mid job with the old foundation removed and the house safely shored up. After removing part of the old foundation walls the crew found further structural issues with the house framing. They consulted with the engineer and came up with a plan to fix the problem. It was a change in scope and design, but Eric didn't change the price of the job. They changed the footer and wall design and worked with me to get the approval to change the job. The additional shoring that was needed on the job because of the change didn't cost us anything extra and now the house is level, secure and stronger than it was before by a longshot. Plumbing, HVAC and electrical are all back in place and passed inspection. Erik even personally made sure the hot water was on and working throughout the house. The crew worked **** ** the job on time and professionally each step of the way. Eric also managed multiple subcontractors on the job and dealt with the permitting process and the City of Ithaca directly. Last day on the job they were cleaning up small specks of material that I would have missed or not really cared about. They also communicated well with the church next door to use their parking lot for access. After the job they returned the church parking lot to better than it was before by grading out some gravel others had snowplowed into a corner before Midstate's job even started. I've already recommended Midstate to friends and wouldn't hesitate to work with them again."
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+4

Recommended by96%of homeowners
Avatar for Highlander Waterproofing, Inc
Highlander Waterproofing, Inc
3.8(
225
)
Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Williamstown, NY and surrounding areas

In business since 2011

Free estimates

Emergency services offered

"I called numerous companies to give me an estimate on waterproofing our basement. Brandon was quick to respond and was able to address the problem and find a solution that was directed at the specific issue. Highlander was easy to work with and actually enjoyed having the entire crew at the house. They went above and beyond answering any questions with a guarantee and cost that I could live with. I highly recommend Highlander to anyone looking to fix a damp basement."
After
After
After
After
After

+11

Response time1 day
Response rate100%
Recommended by88%of homeowners
Avatar for Flawless Painting
Flawless Painting
3.9(
12
)
Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Williamstown, NY and surrounding areas

Free estimates

Emergency services offered

"Paul and his crew painted a side and attic dormer of my three-story house. He was incredibly responsive when I requested a quote and performed the work exactly on the schedule he set out. The crew was careful to do the job professionally and cleaned up after they were done. I have hired painters before and had really bad experiences (delays, over-charges, sloppy work). This crew was not that and I appreciated how seriously they took the job. I would unequivocally use them again."
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+6

Recommended by88%of homeowners
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Basement Waterproofing FAQs, answered by experts

No, everything doesn’t get wet if the bathroom is well-designed and the fixtures are properly installed. It’s important that the floor of a wet room drains correctly, and proper waterproofing and slip-resistant flooring are used to avoid creating slipping hazards. Since the shower isn’t housed in an enclosed space, you’ll need to make sure the towel rack and toilet paper holder are placed in areas where they won’t get wet.

Since basements are prone to water and moisture issues and the resulting problems can be expensive to repair and potentially damaging to your home, basement waterproofing is almost always worthwhile. Even for homes that haven’t experienced water infiltration, waterproofing the basement is insurance against facing expensive repair bills in the future. All basements will leak at some point, so fixing drainage issues and taking steps to prevent moisture and water infiltration is wise.

Yes, you can finish a basement that leaks, as long as you address the leak first. Before finishing a basement, you’ll need to repair any cracks in the walls and waterproof the basement to prevent future leaks. It’s much harder to clean up a water leak from a finished basement than an unfinished one, so preemptively addressing any leaking areas prevents expensive repairs in the future.

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.

The most challenging part of finishing a basement is addressing moisture control. Basement waterproofing is an essential task that requires a professional’s skills and knowledge. If you don’t properly waterproof your finished basement, it’ll be vulnerable to dampness, water damage, and mold growth. Ensuring proper insulation and ventilation to combat these issues while meeting building codes adds complexity to your remodeling project.

The Williamstown, NY homeowners’ guide to basement waterproofing services

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