Leak repair, drainage, sump pumps and foundation sealing
Rockzen USA is a residential and commercial basement waterproofing contractor in NYC. We repair basement leaks and foundation cracks, and install interior waterproofing, French drains, sump pumps and exterior foundation waterproofing in all five boroughs. Call (646) 452-2552 for a free estimate.
We give you a written estimate at no charge.
We are registered with the NYC Department of Buildings.
We work in Manhattan, Brooklyn, Queens, the Bronx and Staten Island.
Rockzen USA is a residential and commercial basement waterproofing contractor in NYC. We handle residential and commercial basement waterproofing in NY for owners of houses, co-ops and apartment buildings in all five boroughs. Water may seep through the walls, come up at the floor joint or flood after heavy rain, and we find the source and fix it. Call (646) 452-2552 for a free estimate.
You want a basement that stays dry, and a plan and a price you can follow. So we start with an inspection, then we tell you which fix fits: interior drains, exterior waterproofing, crack repair, a sump pump, or a mix.
We test for the cause first, because a patch over the wrong cause fails.
Water that reaches the basement needs somewhere to go. An interior perimeter drain, also called a French drain, is a channel along the floor edge that carries it to a sump. Rockzen USA lays the drain and treats the wall and floor joint, so seepage drains instead of spreading.
Water against the outside of a foundation wall keeps pushing in. Exterior waterproofing stops it at the wall. The crew digs along the foundation, seals the wall with a waterproof membrane, sets drainage board and a drain, then backfills.
A crack that leaks gets worse. Once we find the source, epoxy or polyurethane injection or masonry repair closes the crack, and failed mortar joints get repointed. The same repairs cover leaks in walls and floors.
Collected water has to leave. A sump pump moves it from the sump pit through a discharge line, and a battery backup keeps it running in a power cut. A backwater valve stops sewage flowing back into the basement. Rockzen USA installs and replaces all three.
Moisture moves through concrete and block even when nothing leaks. Sealed and coated walls slow it, a vapor barrier cuts what comes through the slab and walls, and a dehumidifier controls the air.
A damp crawl space sends moisture into the house above it. The fix is a moisture barrier over the floor and walls, with the seams sealed.
A flooded basement needs the water removed and the cause fixed. We repair the damage and find out why it flooded so it does not repeat.
Basement waterproofing in NYC costs $3,485 to $8,259 on average, and the citywide average is about $5,842. Minor crack repairs start near $500. Major exterior excavation can pass $30,000. The method sets most of the price, and an attached building can limit what is possible. We price each basement after we inspect it, and we take 5% off.
| Waterproofing method | Average NYC price | What it does |
|---|---|---|
| Minor crack injection | $500 to $1,500 | Seals local wall or floor cracks with epoxy or polyurethane foam. |
| Interior sealer or paint | $1,500 to $4,000 | Applies waterproof coatings to exposed masonry. |
| Sump pump installation | $2,000 to $6,000 | Installs a basin and pump that sends collected groundwater out of the house. |
| Interior drainage or French drain | $3,000 to $8,000 | Opens the perimeter floor and lays a drain that carries water to the sump pump. |
| Full perimeter system | $8,000 to $20,000 | Combines a perimeter drain, wall liners and dual pumps. |
| Exterior waterproofing with excavation | $10,000 to $30,000+ | Digs to the footings, repairs the wall and applies a waterproof membrane. |
| What changes the price | Why |
|---|---|
| Where the water enters | Cracks, joints and a failing wall need different repairs |
| Method | Interior drains and exterior excavation differ in work and cost |
| Length of wall and floor treated | More length means more labor and material |
| Sump pump and backup | A pit, pump, discharge line and battery add cost |
| Access | Tight yards, shared walls and utilities slow the work |
| Permits | Structural or excavation work may need a DOB permit |
These prices are averages, not a quote. Your written estimate names your own figures, and Rockzen USA takes 5% off the price of your waterproofing work.
You call (646) 452-2552 or send photos and the address.
We inspect the walls, floor, joints and drainage to find the source.
You get a written estimate that names the work.
We file any permit, then prepare the area.
We install the drains, pump, membrane or repairs.
We test the system and walk the basement with you.
Timing depends on the size, the method, permits and the weather.
| Interior waterproofing | Exterior waterproofing | |
|---|---|---|
| What it does | Collects water that reaches the basement and drains it away | Stops water at the outside of the foundation wall |
| Work | Done from inside, no excavation | Needs digging along the wall |
| Fits | Seepage at the wall and floor joint, rising groundwater | A wall that leaks through its face, or when the exterior is reachable |
| Limits | Water still reaches the wall | May not be possible on attached buildings or along property lines |
We decide after the inspection. Some basements need both.
Rockzen USA basement waterproofing experts serve all of New York: Manhattan, Brooklyn, Queens, the Bronx and Staten Island. We work on residential and commercial buildings, from row houses, detached homes, co-ops and condos to apartment buildings, and each borough has its own soil, water table and building age. We inspect your basement first, then send the crew that fits the job.
Call (646) 452-2552 with the address and a photo.
Many Manhattan basements sit under older attached buildings, so we work around shared walls, utilities and tight access. We work from our Midtown office at 500 Fashion Ave and cover Lower Manhattan (Financial District 10004, 10005, 10006, Tribeca 10013, Lower East Side 10002), Midtown (10001, 10017, 10018, 10019, 10020, 10036), the Villages (East Village 10003, 10009, West Village 10014) and Upper Manhattan (Upper West Side 10023, 10024, 10025, Upper East Side 10021, 10028, Harlem 10027, Washington Heights 10032, 10033).
Attached row houses are common in Brooklyn, and many have brick or stone foundations. Exterior excavation is often limited there, so interior drains and repointing of the foundation wall do more of the work. We work in Brooklyn Heights 11201, Williamsburg 11211, Park Slope 11215, Bay Ridge 11209, Flatbush 11226, Bensonhurst 11204 and Coney Island 11224.
Many Queens houses have full basements, so we check the wall and floor joint and the drainage first. We work in Astoria 11102, Long Island City 11101, Flushing 11354, Forest Hills 11375, Jamaica 11432, Howard Beach 11414 and Richmond Hill 11418.
The Bronx mixes one- to three-family houses with older apartment buildings, so we look for moisture in masonry walls and failed mortar joints. We work in Riverdale 10471, Fordham 10458, Pelham Bay 10461, Throgs Neck 10465, Morris Park 10462 and Mott Haven 10454.
Many Staten Island homes are detached, so exterior waterproofing is often possible. Lots on a slope or near the water can carry more groundwater, which puts more pressure on the wall. We work in St. George 10301, Port Richmond 10302, New Dorp 10306, Tottenville 10307, Great Kills 10308 and Eltingville 10312.
Rockzen USA is licensed and insured, and registered with the NYC Department of Buildings (DOB). Ask any contractor for proof.
We check cracks, joints, grading and drainage, and we separate groundwater from condensation and plumbing leaks, because each needs a different fix.
We use waterproof membrane, drainage board, sealants and pumps suited to your wall and your water source, and we test the system before we leave.
Excavation and structural work may need a DOB permit, and we file it. We build to approved drawings and bring in an engineer when the work needs one.
Roughly. Basement waterproofing in NYC averages about $5,842, within a range of $3,485 to $8,259.
Less. A 500 sq ft basement has about 90 feet of wall if it is square, so there is less drain, liner and sealing to install.
More. A 1,000 sq ft basement has about 126 feet of wall if it is square, which is roughly 40% more than a 500 sq ft basement.
Most. A 2,000 sq ft basement has about 180 feet of wall if it is square, so the drain, liner and labor run longest here.
Often. It protects what you store and build there.
Depends. The source of the water decides.
Yes. Interior systems work without excavation.
Diagnose. Find the source before you repair anything.
Sometimes. You need one if collected water has nowhere to drain by gravity.
Varies. It depends on the system, the installation and the conditions.
Sometimes. A dry, documented basement removes a common buyer concern.
Test. The location of the moisture tells you.
Yes. Floodwater can hide electrical hazards and contamination.
Compare. Ask every contractor for the same things.
Tell us about your basement and where it is. A photo helps. We will reply to book your free visit.
© 2026 Rockzen USA INC. All Rights Reserved. Designed & Developed by Dexon Solutions.
