Best Waterproofing Companies in Long Island
Long Island

Best Waterproofing Companies in Long Island

Find trusted waterproofing professionals serving Long Island. All contractors are independently researched and certified.

Only companies with a Certified Best Pick® badge meet our strict satisfaction & licensing requirements and are eligible for the Best Pick Guarantee.

1
Recommended Pros
193+
Verified Reviews
Locally FocusedResearch-VerifiedFree Service

1 Contractors

Only companies with a Certified Best Pick® badge meet our strict satisfaction & licensing requirements and are eligible for the Best Pick Guarantee.

Larry Janesky's Healthy Basement Systems
Certified Best Pick

Larry Janesky's Healthy Basement Systems

Certified Pro

All Things Basementy! Our Vision: A world of healthy, safe, and efficient homes. Our Mission: To be the contractor of choice by giving consistently great service to our customers and each other. Our Values: Integrity, Leadership, Growth, Innovation, Education.

2nd year as a Best Pick Insured Workers' Comp

Recent Project Requests in Long Island

Real homeowners looking for waterproofing in your area

Centerport

"Want to turn a closet into open shelving with draws. Stain a wood wall Paint a stairwell Just pricing out estima..."

Feb 25, 2026
Lake Grove

"My name is Tami Mitchell. I am looking to have my mother's carpets and the kitchen floor steamed. It would be her master..."

Dec 14, 2025
Long Island

"I have overhead lights out in two rooms The corresponding breaker did not trip When I turned the breaker on and off..."

Nov 8, 2025
Elmont

"We need to have a shower handle replaced in the upstairs shower. In addition, the cold water has not been working in thi..."

Nov 2, 2025
West Hempstead

"Water is backing into our sink and washing machine in the basement. The water that is coming up is foul smelling and bla..."

Oct 26, 2025
Brentwood

"I would like to redo my laundry room in the basement. I would like sheetrock and new floors."

Oct 21, 2025
Long Island

"Reface front of house with vinyl cedar shakes Put white molding around windows I believe it’s called aluminum."

Oct 19, 2025
Long Island

"gas heating and cooling annual contracts"

Sep 25, 2025
Long Island

"I’m interested in getting an estimate for a few electrical repairs and updates needed around my home. Replace a ceiling..."

Sep 23, 2025
West Islip

"I would like to have a window replacement installed. I already have the new window ready to go."

Sep 22, 2025
Certification Standards

How Long Island Waterproofing Companies Earn Best Pick Certification

Only waterproofing companies that meet our strict standards earn Best Pick status.

Customer Satisfaction

Waterproofing companies must maintain a 4.0+ rating and an 80% recommendation rate.

Licensing & Insurance

Current state contractor license verification and general liability insurance for waterproofing work

Business Stability

Minimum 1 year in business with established local presence

Verified State Standing

Maintain active business registration and in good standing with the state

Operational Excellence

Consistent waterproofing service quality across all projects

Annual Re-Certification

Must re-qualify every year through new research

Frequently Asked Questions

Common questions about Certified Best Pick® waterproofing companies in Long Island

Best Pick Certified Waterproofing companies in Long Island have earned their status through independent consumer research—not paid placement. To qualify, a company must meet strict standards:

  • High customer satisfaction: 4.0+ Google rating (25+ reviews) OR 80%+ recommendation rate from surveyed customers
  • Verified credentials: Active state licenses, general liability insurance, and workers' comp (where required)
  • Financial stability: Clean credit history and active Secretary of State standing
  • Local track record: Minimum 1 year serving the Long Island area

Certification is re-verified annually, ensuring continued performance.

No. Waterproofing companies cannot buy Best Pick Certification, improved ratings, or better placement. Our research team independently evaluates companies based on customer satisfaction, licensing, insurance, and business stability—before any business relationship exists.

Companies that earn certification pay a participation fee after qualifying, which covers the cost of ongoing research and publication. This fee has no influence on whether a company qualifies or how they appear in our directory.

The Best Pick Guarantee provides financial protection—up to $2,500 in labor costs—if a Certified Best Pick Waterproofing company fails to deliver on their commitments.

To be eligible:

  • Contact the company through Best Pick Reports or BestPickReports.com
  • Register for the guarantee (free)
  • Submit any claim within 45 days of the final date of service
  • Allow the company the opportunity to resolve the issue first

This guarantee applies only to Certified Best Pick companies, not Standard Pros. Full terms are available on our guarantee page.