Find a licensed basement waterproofing company in Islip, NY

Who licenses basement waterproofing companies in Islip

• Waterproofing is named in Suffolk County's home improvement law, and the law makes a county license mandatory for the businesses it regulates, unless exempt.
• Basements and waterproofing both appear on Suffolk Consumer Affairs' list of home improvement work.
• Work in the electrical and plumbing fields is excluded from Suffolk's home improvement definition.
• A waterproofing contractor working without a license in Suffolk is subject to arrest and prosecution, Consumer Affairs warns.

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

What the Town of Islip requires

• The Town offers flood zone determinations: an owner fills out the request form and submits it to the Planning Division, which determines the zone.
• The Town's floodplain page places the highest-risk Special Flood Hazard Area, Zones A and V on the flood insurance rate map, mainly along the Great South Bay and Fire Island.
• The Town of Islip has been a member of the National Flood Insurance Program since 1972.

The Town of Islip Building Division handles permits ((631) 224-5464). Our Town of Islip permit guide covers how to apply, inspections and certificates.

Homes in Islip: what the Census shows

Across the Town of Islip, villages included, the median home was built in 1967, and 34% of homes were built before 1960. 80% of homes here are owner-occupied, and 75% 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 Islip

• 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 Islip 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?