Top Waterproofing Contractors in New York City

Basement waterproofing in New York City costs $5–15/sqft depending on the method. Interior sealants are the most affordable at $1,500–4,000, while exterior excavation and membrane systems run $8,000–25,000 for a full perimeter.

Watch for damp or musty smells in your basement, visible water stains on walls, efflorescence (white mineral deposits), cracks in foundation walls, pooling water after rain, and mold growth. In New York City, seasonal weather patterns can worsen these issues.

Most jurisdictions in New York City require waterproofing contractors to hold a general contractor or specialty license. They should also carry liability insurance and offer warranties on their work — typically 10–25 years for foundation waterproofing.

Compare verified waterproofing contractors on Biddaro in New York City. Check their warranty terms, read customer reviews, verify licensing, and get at least 3 quotes before committing to a project.