Find a licensed basement waterproofing company in Oyster Bay, NY

Who licenses basement waterproofing companies in Oyster Bay

• 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 Oyster Bay requires

• The Town's permit list covers any interior alterations and cellar entrances.
• The Town's residential code worksheet has boxes to mark a basement and whether it is finished or habitable.
• The Town counts work costing 50% or more of market value as a substantial improvement. In any FEMA flood zone other than X, a substantial improvement or repair needs a signed and sealed appraisal of the dwelling's value, land excluded, from a state-licensed appraiser.
• The Town's site plan rules hold flood plain areas to federal minimum elevations, set a nine-foot minimum elevation for habitable space and require FEMA flood zone designations on the plans.
• The Town takes part in the National Flood Insurance Program, which lets owners in its Special Flood Hazard Areas buy flood insurance. It notes that FEMA is updating the flood maps.

The Town of Oyster Bay Building Division handles permits ((516) 624-6200 ext. 1). Our Town of Oyster Bay permit guide covers how to apply, inspections and certificates.

Homes in Oyster Bay: what the Census shows

Across the Town of Oyster Bay, villages included, the median home was built in 1957, and 63% of homes were built before 1960, 10% before 1940. 89% of homes here are owner-occupied, and 86% 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 Oyster Bay

• 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 Oyster Bay Building Division, 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?