Basement Waterproofing cost per linear foot in Long Island
Basement Waterproofing cost per linear foot in Long Island, New York in 2026.
Low
$3,900
Average
$8,450
High
$15,600
Long Island crews quote about $52 – $325 per linear foot.
Multiply local unit rates by your real measurements.
What drives basement waterproofing prices in Long Island
Local labor, permitting and climate move Long Island prices away from the national average.
Labor market
Nassau and Suffolk crews are busy year round with premium suburban pricing.
Permits
Town-level permits vary widely and can be slow.
Climate
Coastal wind zones and nor easters affect roofing and siding.
Long Island unit pricing by material
Ways to lower your Long Island price
- Do the cheap exterior fixes first — gutters, downspout extensions and grading solve many wet basements for under $1,000.
- Choose interior drain tile over exterior excavation unless the wall itself is failing.
- Get bids from waterproofing specialists and a general contractor; approaches and prices differ enormously.
- Ask about a transferable lifetime warranty — it holds value at resale.
- Install the sump and drainage before finishing the basement, never after.
Long Island questions
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