Basements April 10, 2026
Basement Finishing Contractors NYC & Long Island | 2026 Guide
Vetted basement finishing & remodeling contractors across NYC and Long Island. Cost per sq ft, permits, egress, waterproofing — what to ask before signing.
Looking for basement finishing contractors in NYC, Nassau, or Suffolk County? Gotham Home Services is a licensed basement renovation contractor finishing 60+ basements a year across Queens, Brooklyn, Bronx, Manhattan, Staten Island, and all of Long Island — from a clean rec room to a full legal conversion with egress, bath, and kitchenette.
Basement finishing cost per square foot in our market runs $55–$120 installed in 2026. A 700 sq ft basement remodel typically lands $38,500–$84,000 depending on scope: framing, insulation, drywall, electric, flooring, drop or finished ceiling, recessed lighting, a half or full bath, egress window, and waterproofing.
What's included in a real basement remodeling quote: moisture testing, sump and French drain if needed, R-13 closed-cell or rigid foam on foundation walls, steel-stud or PT-bottom-plate framing, ½" moisture-resistant drywall, GFCI circuits, egress per NYC/LI code, and finishes (LVP, tile, paint, trim).
Permits: NYC requires DOB filing for any basement conversion (especially adding a bath, bedroom, or egress). Long Island towns (Hempstead, Babylon, Smithtown, Islip, Brookhaven) all require permits and final inspection. We pull every permit in your name.
Why homeowners hire Gotham as their basement renovation contractor near me: written line-item estimate, licensed and insured, NYC DOB / Nassau & Suffolk consumer affairs registered, waterproofing before finish, and a workmanship warranty on every basement remodel.
FAQ
What's the cost per sq ft to finish a basement in NYC or Long Island?
$55–$120 per sq ft installed in 2026, with most 700 sq ft basement remodels landing $38,500–$84,000 depending on bath, egress, and finish level.
Do basement finishing contractors near me need a permit?
Yes — NYC DOB and every Nassau/Suffolk town require permits for basement conversions, especially when adding a bath, bedroom, or egress. Gotham pulls every permit.
How long does a basement remodel take?
A typical 700–1,000 sq ft basement renovation runs 4–6 weeks from demo to punch list, longer if a full bathroom or kitchenette is included.
Difference between basement finishing and basement remodeling?
Finishing turns raw space into livable rooms (framing, drywall, flooring). Remodeling updates an already-finished basement. We do both as a full-service basement renovation company.
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