Find a licensed basement waterproofing company in Southampton, NY

Who licenses basement waterproofing companies in Southampton

• 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.
• Southampton requires its own Home Improvement Contractor's License for home improvement work, and its licensing covers every village except the Village of Westhampton Dunes. A builder of a new home needs no town license for now, but the builder's subcontractors must be licensed.
• A Southampton home improvement license is valid for one year. A new application costs $250.00 by cash or check or $257.50 by credit, and an on-time renewal costs $175.00, or $180.25 by credit.

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

What the Town of Southampton requires

• Southampton requires a building permit for every conversion of space, including one from a legal finished basement.
• Before January 2003, Southampton did not permit bedrooms below grade level.
• Southampton's interior renovation checklist asks for workers' compensation proof and says the contractor must hold an active town license.
• Southampton requires any restoration, reconstruction or retrofit of a flood-damaged building to comply with Town Code Chapters 330, 138, 169 and 325, as they apply.
• Under Southampton's FEMA non-conversion agreement, the enclosed area below the lowest floor may be used only for parking, limited storage or building access, and the owner agrees not to alter the building later in violation of the building code or flood damage prevention rules.
• For a property's FEMA flood zone information, Southampton says to speak with a Building Inspector, who can research the property.

The Town of Southampton Building and Zoning Department handles permits (631-287-5700). Our Town of Southampton permit guide covers how to apply, inspections and certificates.

Homes in Southampton: what the Census shows

Across the Town of Southampton, villages included, the median home was built in 1983, and 22% of homes were built before 1960, 10% before 1940. 82% of homes here are owner-occupied, and 89% 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 Southampton

• 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 Southampton Building and Zoning 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?