Find a licensed basement waterproofing company in Riverhead, NY

Who licenses basement waterproofing companies in Riverhead

• 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 Riverhead requires

• Riverhead's finished basement form asks whether the space will be a legal accessory apartment and whether a violation was issued for finishing it without a permit. It notes that added sleeping rooms may need Suffolk County Department of Health Services approval.
• Riverhead's building FAQ says a plan to finish a basement without structural changes may not need a design professional's seal.
• Riverhead requires a flood elevation certificate for work within the floodplain, and the close-out papers include a final flood elevation certificate prepared by a New York State licensed surveyor.
• Riverhead's residential permit packet asks whether FEMA floodplain regulations apply to the project and, if they do, points to the town's FEMA requirements.
• Under section 217-6(k) of the Town Code, Riverhead holds the owner or contractor responsible for all drainage and flooding issues.
• Riverhead's Building page directs residents to view FEMA's Flood Insurance Rate Maps online.

The Town of Riverhead Building Department handles permits (631-727-3200 ext. 213). Our Town of Riverhead permit guide covers how to apply, inspections and certificates.

Homes in Riverhead: what the Census shows

Across the Town of Riverhead, the median home was built in 1984, and 26% of homes were built before 1960, 11% before 1940. 80% of homes here are owner-occupied, and 69% 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 Riverhead

• 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 Riverhead 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?