ExteriorStructural

Waterproofing

Keep Water Out — Permanently

718.762.3400

Water infiltration is the leading cause of structural damage in New York properties. Bonardi Construction provides comprehensive waterproofing solutions for basements, foundations, roofs, and exterior walls that create lasting barriers against moisture.

What's Included

Interior basement waterproofing systems
Exterior foundation waterproofing
Crystalline and membrane-based waterproofing
Flat roof waterproofing and membrane systems
Window and door perimeter sealing
French drain and sump pump integration

The Bonardi Advantage

We assess the source of water entry before recommending a solution — because every waterproofing failure is different. Our systems carry manufacturer and installation warranties.

Frequently Asked Questions

The best method depends on the source and severity of water intrusion. Interior waterproofing systems with a sump pump work well for managing hydrostatic pressure, while exterior waterproofing with membrane application provides the most complete barrier. Bonardi Construction assesses your specific situation and recommends the approach that will be most effective long-term.

Interior basement waterproofing in the New York area typically ranges from $3,000 to $10,000 depending on the size of the basement and the system installed. Exterior waterproofing, which involves excavation, generally costs more — ranging from $8,000 to $20,000 or higher. We provide free assessments and detailed estimates.

Exterior waterproofing prevents water from ever reaching the foundation wall and is generally the most effective long-term solution. However, it requires excavation and is more expensive. Interior systems manage water that has already entered and redirect it to a sump pump. In many cases, a combination of both methods provides the best protection.

Waterproofing project by Bonardi Construction

Request a Quote

Get a free, no-obligation estimate for your waterproofing project. We respond within one business day.

Why Choose Bonardi

◆30+ years of licensed experience

◆NYC, Nassau & Suffolk licensed

◆Lead-Safe Certified Firm

◆Full project management

◆Transparent pricing, no surprises

Service Area

Queens · Brooklyn · Nassau County · Suffolk County · Long Island

Related Services

Waterproofing

What's Included

The Bonardi Advantage

Frequently Asked Questions

Foundation Repair & Restoration

Drainage Solutions

Masonry, Brick Pointing & Weatherproofing

Roofing Services

Bonardi Construction