Long Island's Basement Experts Since 2011
Basement Finishing Long Island
Transform your raw concrete basement into a finished living space. LI Basement Pro has finished 580+ basements across Nassau and Suffolk Counties since 2011.
Mon–Sat, 7am–5pm · Free Estimate · No Obligation
Free Estimate — No Obligation
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Long Island Basement Finishing Experts
The Right Way to Finish a Long Island Basement
Basement finishing on Long Island isn't the same as basement finishing anywhere else. Long Island's high water table, clay-heavy glacial soil, and the prevalence of older construction — Levitt-era ranches, 1960s colonials, split-levels — means you need a contractor who knows these specific challenges. That's been our specialty since 2011.
We've finished basements in Hicksville, Commack, Garden City, Hauppauge, and dozens more Long Island communities. We know which neighborhoods have the worst groundwater issues, which building departments are fastest on permit approvals, and where to expect surprises behind the block walls.
Every basement finishing project we do starts with a moisture assessment. We look for active seepage, efflorescence (salt deposits from water migration), and drainage issues before a single stud goes up. If we find something, we'll tell you — and we can fix it before it becomes your problem after the drywall is up. For homes with active water table issues, we often recommend a TripleSafe sump pump system before finishing begins — the best insurance for a Long Island basement investment.
What's Included in Our Basement Finishing Service
What Does Basement Finishing Cost?
Every Long Island basement is different. Size, moisture conditions, finish level, bathroom additions, egress requirements, and your town's permit fees all affect the final number. We don't publish ranges because they give homeowners false expectations.
What we do is come out, measure your space, assess the conditions, and give you a detailed written estimate — at no charge and with no obligation.
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Our Basement Finishing Process
Free Estimate & Measurement
Dan or a senior estimator visits your home, measures the space, discusses your goals, and checks for any moisture or structural issues that need addressing before finishing.
Permit Application
Karen files all necessary permits with Nassau or Suffolk County building departments. We handle the paperwork — you just need to be available for the final inspection.
Framing & Rough Work
We frame partition walls, run rough electrical and plumbing, install insulation, and create any required egress openings. All work is inspected before closing up walls.
Drywall & Ceiling
Drywall hanging, taping, and finishing or drop ceiling grid installation. We achieve smooth, paint-ready surfaces throughout.
Flooring & Finishes
Tony and his carpentry team install LVP flooring, baseboards, door casings, and any built-in elements like closets or storage walls.
Final Inspection & Walkthrough
Building department final inspection, followed by our walkthrough with you to address any punch list items before we consider the job complete.
Get Your Free Estimate
We visit your home, measure the space, and give you a detailed written quote — no charge, no obligation.
Call (631) 625-8649Request Online✓ Free on-site measurement
✓ Detailed written quote
✓ No obligation
✓ Mon–Sat, 7am–5pm
Verified Local Work
Recent Basement Finishing Jobs
Real jobs completed by our crew across Nassau and Suffolk Counties.
650 sq ft basement with LVP flooring, recessed lighting, and egress window
800 sq ft basement with home office, bathroom rough-in, and drop ceiling
550 sq ft playroom/guest suite conversion with full drywall and LVP
Full luxury basement finish with wet bar, home theater prep, and bathroom
720 sq ft basement with home gym, storage room, and LVP throughout
600 sq ft basement conversion — new partition walls, drop ceiling, carpet
Got Questions?
Basement Finishing FAQs — Long Island
Every project is different — basement size, finish level, moisture conditions, bathroom rough-ins, egress requirements, and permit fees all affect the final number. We give free on-site estimates so you get accurate pricing specific to your home and your Long Island town. Call us or request an estimate online.
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Ready to Transform Your Long Island Basement?
Join 580+ Long Island homeowners who chose LI Basement Pro. Free estimates, no pressure, no obligation.
Mon–Sat, 7am–5pm · Free Estimates · No Obligation · Licensed & Insured