5 Best Basement Renovation Contractors in New York (2026)

Quality 1st Basement Systems is a waterproofing and concrete contractor serving the greater New York and New Jersey area, handling interior and exterior basement waterproofing, sump pump installation, and crawl space encapsulation. It runs a large, established operation with thousands of Google reviews describing sales consultations that walk homeowners through the process before any work begins. By review volume, it is the busiest basement specialist covering this market.

A-1 Basement Solutions specializes in drainage, crawl space encapsulation, basement waterproofing, and sump pump installation for New Jersey and New York homes, staffed entirely by W2 employees rather than subcontractors. Reviewers repeatedly praise the company's transparent, no-pressure approach to sales, contrasting it with competitors using high-pressure tactics. Several reviews describe systems still performing dry years after installation.

B Altmans Waterproofing is a Staten Island-based waterproofing and foundation repair company, in business since 1992, using a proprietary liquid epoxy injection process to seal foundation cracks without digging a French drain. Reviewers describe the company diagnosing and fixing groundwater leaks that had persisted for years, with a lifetime transferable guarantee on the work. It focuses specifically on structural crack repair rather than full basement finishing.

Zicklin Contracting Corp. is a family-owned New York general contractor with 37-plus years in business, and basement renovation is a named specialty alongside kitchen and bathroom remodels across all five boroughs. Reviewers describe the company redoing basements including drain line repairs, and its own site describes basement finishing as making use of every square foot in a city where space is scarce. It is a rare name on this page that can handle both structural work and the finishing carpentry to make a basement livable.

Oberoi Construction - Masonry & Waterproofing NYC is a Queens-based contractor covering masonry, waterproofing, and roofing across New York City, with basement waterproofing and leak repair listed as core services alongside brick and stone work. Reviewers describe brickwork and structural repairs completed at prices notably lower than competing quotes, with the crew's attention to detail called out repeatedly. One reviewer reported a dispute over scope changes on a curb-cut permit job.