Find a licensed basement waterproofing company in Hempstead, NY

Who licenses basement waterproofing companies in Hempstead

• Nassau's Administrative Code names waterproofing as home improvement work, and no one may run a home improvement business in the county without a license.
• Waterproofing is on Nassau County Consumer Affairs' list of who must be licensed.

State rules and the lookup steps: how to check a basement waterproofing company's license.

What the Town of Hempstead requires

• The Town requires a building permit to repair disaster damage, as in all construction, to ensure life safety, proper construction practices and compliance with local, state and federal codes.
• The Town treats damage as minor when restoring the home to its pre-event, latest legal state costs less than 50% of the structure's replacement value. That work needs a permit to repair in like and kind and a certificate of completion.
• The Town requires full compliance with New York State and FEMA construction guidelines for a certificate of occupancy after a substantial improvement or repair, meaning work over 50% of the structure's pre-disaster fair market value. Compliance may include raising the house.
• The Town sets its design flood elevation at the base flood elevation plus two feet of freeboard.
• The Town's July 31, 2018 fee printout sets $50 for any certificate of completion tied to a building permit, payable when the permit is issued.
• The Town's disaster information page notes that anyone with a mortgage living in a Special Flood Hazard Area must have flood insurance.
• The Town gives flood map information by phone at 516-489-5000, through its Building Department.

The Town of Hempstead Building Department handles permits (516-538-8500). Our Town of Hempstead permit guide covers how to apply, inspections and certificates.

Homes in Hempstead: what the Census shows

Across the Town of Hempstead, villages included, the median home was built in 1954, and 70% of homes were built before 1960, 22% before 1940. 82% of homes here are owner-occupied, and 78% are single-family detached houses.

What basement waterproofing costs here

Labor is a large part of any price. Long Island construction laborers earn a median $58,875 a year, from about $39,468 at entry level to $79,154 with experience. Cement masons and concrete finishers earn a median $65,026 a year, from about $53,234 at entry level to $82,344 with experience. (New York State Department of Labor, wages updated to the first quarter of 2026.) Prices come from written estimates; more in the basement waterproofing cost guide.

Before you hire in Hempstead

• Ask for the license number the work needs here (see who licenses basement waterproofing companies above), and check it before you sign.
• Ask who files with the Town of Hempstead Building Department, and who books the inspections.
• Where is the water coming from, in writing, before you sell me a system?
• Would grading, gutters or downspout extensions fix it for less?