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Complete Basement Systems

Providing Basement Waterproofing, Crawl Space Repair & Foundation Repair for Long Island, New York

For over 20 years, Complete Basement Systems has been the preferred choice for residents of Long Island, New York, whenever they need the reliable services that keep their homes stable and dry. Locally owned and operated, Complete Basement Systems is here to help whenever you need us most.



Since 2000, Complete Basement Services has been dedicated to making homes healthy and safe. Our team is licensed, insured, and certified to do business in all of Long Island, and we will stop at nothing to ensure that your basement or foundation issues are resolved withour breaking the bank.

About us


Is your basement collecting water, or have you discovered cracks in your foundation? It’s time to call the professionals at Complete Basement Systems. For over 20 years, we have provided our customers with basement waterproofing, foundation repair, crawl space encapsulation, and insulation services that solve their foundation issues the right way.view our services

Basement Waterproofing Icon

Basement Waterproofing

Crawl Space Icon

Crawl Space

Foundation Repair Icon

Foundation Repair

Insulation Icon



Helpful and Professional Sales Team

Your salesman is a great guy. His presentation and reference from a friend convinced me to use your company. I was extremely satisfied with the job, the installation crew was friendly, excellent and the clean-up was totally satisfactory. Your office staff was very cordial and helpful.

Daniel S. of Port Washington, NY
Thursday, June 5th

Professional and Experience Workers

The crew was professional and pleasant. Dan was excellent! We heard about complete basement systems from our neighbors. We chose them because of their strong recommendation and Dan’s great presentation. The rest of the workers were terrific and very respectful. Overall, great experience and a very professional company.

Kevin K. of Long Beach, NY
Wednesday, February 5th

Professional and Courteous

We heard about this company from a friend. Chose them based off expertise and their reputation. Very satisfied with everything. Salesman was to the point and professional. John was a gentleman from start to finish. His expertise was assuring and the great work promised was done.

Bob H. of Oceanside, NY
Tuesday, June 10th

Excellent Installation Crew

Very satisfied with the job, installation crew was excellent. The office staff was professional and courteous. Your salesman was knowledgeable and thorough. I have made several recommendations on our block alone.

Adam of Merrick, NY
Monday, October 22nd

Thorough, Clean, Professional

I was very satisfied with the job, I thought the installation crew was fantastic! The job site was left very clean. Your salesman was very knowledgeable and informative, in addition the office staff was very professional and friendly.

Mike W. of Bellmore, NY
Tuesday, May 13th

We’re Here to Serve You

Contact us today, and we’ll give you a free, no-obligation quote.