Nassau County's Basement Contractor — Since 2011
Basement Finishing Nassau County
LI Basement Pro serves all of Nassau County — from Hicksville and Levittown to Garden City and Valley Stream. Licensed Nassau County contractor with 300+ Nassau basements completed.
Mon–Sat, 7am–5pm · Free Estimate · No Obligation
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Nassau County Basement Experts
Basement Finishing & Waterproofing Across Nassau County
Nassau County is LI Basement Pro's home territory. Dan Farrelly grew up in Hicksville, and the company has been servicing Nassau County basements since 2011. We know Nassau's building department processes — from the county permit office to the individual village departments in Garden City, Hempstead, and Valley Stream.
Nassau County's housing stock is diverse but has consistent patterns. Levitt-era homes in Levittown and Hicksville are the most common basement project type — typically 550–750 sq ft unfinished basements in ranch and cape-style homes. These homes were built from the late 1940s through the 1960s and many have aging cinderblock walls that need waterproofing assessment before finishing begins.
We also do a lot of work in the higher-end Nassau communities — Garden City colonials, Manhasset estates, and Great Neck homes — where the finishing scope is typically more comprehensive: full bathrooms, wet bars, home theaters, and luxury flooring.
Nassau County Permit Information
Towns We Serve in Nassau County
Verified Local Work
Recent Jobs in Nassau County
Real jobs completed by our crew across Nassau and Suffolk Counties.
650 sq ft basement with LVP flooring, recessed lighting, and egress window
Full remodel: new plumbing rough-in, drywall, recessed lights, LVP flooring
Full perimeter exterior waterproofing membrane on 1972 colonial estate — 180 linear feet, rubberized membrane with drainage board and footing drain
Interior drainage system + dual sump pump installation on cape-style home
800 sq ft basement with home office, bathroom rough-in, and drop ceiling
Two egress windows with full excavation and waterproofed window wells
Battery backup sump pump system after basement flooding
550 sq ft playroom/guest suite conversion with full drywall and LVP
Got Questions?
Nassau County Basement FAQs
Yes. Nassau County requires building permits for basement finishing, including electrical, plumbing, and structural work. The Nassau County Building Department processes permits — our office manager Karen handles all applications. Permit costs in Nassau typically run $500–$1,500 depending on project scope.
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Mon–Sat, 7am–5pm · Free Estimates · No Obligation · Licensed & Insured