Brooklyn Wet Basement Repair
Basement Waterproofing in Brooklyn, NY
Damp row house cellars, leaking areaways and puddles after storms near the bay, traced to the real source and fixed from inside or outside the wall.
- Interior drains, sump pumps and crack injection
- Areaway, downspout and grading fixes
- Honest advice when a plumber is the answer
Why Do Brooklyn Basements and Cellars Get Wet?
Brooklyn cellars get wet from groundwater against old walls, rain running toward the house from the yard or areaway, cracked or crumbling mortar, and sewer backups in heavy rain. Which one you have decides the fix, so finding the source comes before choosing a method.
Much of the borough is old housing. Brownstone and brick row houses in Park Slope, Boerum Hill and Bedford-Stuyvesant sit on stone or brick walls that were never built with modern waterproofing. Water moves through mortar joints slowly and shows up as dampness, flaking paint and white salt on the wall.
Many of those houses have a front areaway below the sidewalk and a small rear yard. Both collect water when drains clog.
Areaways and Yards
How Do Areaway Drains and Downspouts Cause Brooklyn Leaks?
A front areaway is a sunken space at the stoop with a wall against the house. If its drain clogs, rain and snow melt pool against the wall and seep in. Downspouts that empty at the foundation and yards that slope toward the house do the same. These are the first things to check.
- An areaway that holds water after rain
- A downspout ending at the foundation
- A rear yard sloping toward the house
- Cracks in areaway walls and floors
- Cellar doors and windows leaking at the frame
Fixes for these are often small and cost less than any wall work. In landmarked blocks such as Brooklyn Heights, Boerum Hill and Park Slope, changes to visible areaways can involve the Landmarks Preservation Commission, so check first.
Which Brooklyn Areas Deal With Flooding Near the Water?
Coastal and low lying parts of Brooklyn took heavy flooding during Hurricane Sandy in 2012. That includes Red Hook, Coney Island, Gerritsen Beach, Sheepshead Bay, Seagate, Canarsie and Mill Basin. Waterproofing controls seepage there, but it cannot hold back storm surge.
Gowanus sits low along the canal, which overflowed during Hurricane Sandy, and heavy rain there can cause sewer overflows and street flooding. Bergen Beach, Brighton Beach and Manhattan Beach also flooded during that storm.
Being near the water does not put every lot at risk, and inland blocks can still flood in cloudbursts. Look up your address on the current FEMA and NYC flood maps before you plan work. For coastal basements, a sensible plan mixes seepage control with steps that limit damage, such as pumps with battery backup and keeping mechanical equipment up high.
What Is the Best Waterproofing Method for a Brooklyn Cellar?
It depends on where the water enters. Drainage fixes outside come first. Single cracks in poured concrete can be injected. Damp stone walls often need repointing and drainage instead of coatings. Steady seepage along the floor usually calls for an interior drain and sump pump.
| Brooklyn situation | What usually makes sense |
|---|---|
| Areaway holds water after rain | Clear or replace the drain, fix slope |
| Damp stone or brick cellar wall | Repoint joints, improve outside drainage |
| Seepage along the base of walls | Interior perimeter drain and sump pump |
| Rear wall you can reach from the yard | Exterior membrane with drainage |
| Water from floor drains in a storm | Licensed plumber, backwater valve |
Sealing old rubble stone with hard cement or plain paint can trap moisture in the wall. Your cellar may need work on the joints first. Our Brooklyn foundation repair page covers that.
When Is a Sewer Backup a Plumber's Job in Brooklyn?
If water or sewage comes up through floor drains, toilets or tubs during heavy rain, the city sewer is backing up into your pipes. No coating or drain in the wall fixes that. A licensed plumber is the right call, and a backwater valve on the sewer line is often what they discuss.
A backwater valve is plumbing work that generally needs a permit. We are not plumbers and will say so when that is what you need. Check with NYC DEP or 311 for current guidance on sewer backups.
Some Brooklyn basements have both problems: groundwater seepage in the walls and a sewer backup in the worst storms. The plumber handles the valve, and we handle the walls and floor.
From Visit to Dry Floor
How Does a Brooklyn Waterproofing Job Run?
It starts with finding the water: when it shows up, where it enters and whether it comes from ground, rain or the sewer. You get a written scope, outside fixes come first, then wall or floor work, and pumps and drains are tested before hand back.
Find the source
Walls, floor, areaway, drains, downspouts and yard slope are checked.
Written plan
You get a price for the fitting methods, and a plain note when part belongs to a plumber.
Outside first
Downspouts, areaway drains and grading are fixed where they are part of it.
Wall and floor work
Repointing, injection, coatings, interior drains or membranes as planned.
Test and clean up
Pumps run and drains flush where possible before the cellar is handed back.
Pricing
What Affects the Cost of Basement Waterproofing in Brooklyn?
Cost depends on the cellar size, whether the fix is inside or outside, how much digging is needed, sump pump and backup power, and access. A clogged areaway drain and a full interior drain with pump are at opposite ends of the range.
Cellar size
More wall length means more drain, coating or membrane.
Inside or outside
Interior work avoids digging. Exterior work stops water at the wall.
Digging
Yards and areaways need shoring and restoring after excavation.
Pumps
Pit, pump, backup power and a discharge route all count.
Access
Finished rooms and narrow cellar stairs slow the work.
Wall condition
Loose mortar or cracks may need repair first.
Every Brooklyn waterproofing job gets a written price after a free visit.
Request Your QuoteNeighborhoods
Brooklyn Neighborhoods Where We Waterproof Basements
Choose your neighborhood for notes on cellars and water conditions there.
- Bath Beach
- Bay Ridge
- Bedford-Stuyvesant
- Bensonhurst
- Bergen Beach
- Boerum Hill
- Borough Park
- Brighton Beach
- Brooklyn Heights
- Brownsville
- Bushwick
- Canarsie
- Carroll Gardens
- Clinton Hill
- Cobble Hill
- Coney Island
- Crown Heights
- Cypress Hills
- Ditmas Park
- Downtown Brooklyn
- DUMBO
- Dyker Heights
- East Flatbush
- East New York
- Farragut
- Flatbush
- Flatlands
- Fort Greene
- Fort Hamilton
- Gerritsen Beach
- Gowanus
- Gravesend
- Greenpoint
- Greenwood Heights
- Homecrest
- Kensington
- Manhattan Beach
- Marine Park
- Midwood
- Mill Basin
- Ocean Hill
- Ocean Parkway
- Park Slope
- Prospect Heights
- Prospect Lefferts Gardens
- Prospect Park South
- Red Hook
- Seagate
- Sheepshead Bay
- South Slope
- Spring Creek
- Sunset Park
- Vinegar Hill
- Weeksville
- Williamsburg
- Windsor Terrace
- Wingate
No neighborhood matches that name. Call (718) 468-8803 and we will tell you if we cover your block.
Other Boroughs
Basement Waterproofing Beyond Brooklyn
The NYC waterproofing hub compares the boroughs, and the basement waterproofing overview explains each method.
Source before method
The plan follows where the water enters, so you do not pay for a pump when a downspout is the problem.
Honest referrals
When the sewer is the cause, you hear that a plumber is the right call.
Licensed and insured
Construction, injury and workers compensation insurance, and 25+ years in NYC.
FAQ
Brooklyn Waterproofing Questions
Moisture moving through old stone or brick walls, a clogged areaway drain or poor yard drainage are common causes. A visit finds the source. Ventilation and a dehumidifier can help once the water is under control.
Often, yes. We check the areaway drain, walls and slope first. In landmarked districts, visible changes can involve the Landmarks Preservation Commission.
It controls seepage but cannot stop storm surge. Coastal basements benefit from pumps with battery backup and a plumber-installed backwater valve where sewer backup is an issue.
Where the pump discharges matters, and city rules may limit it. We check the options before running the line. Confirm current rules with the city.
No. That is a plumbing problem for a licensed plumber, who may install a backwater valve.
Yes. We serve the Brooklyn neighborhoods listed above. Call (718) 468-8803 or send the form for a free visit.
Free on site estimate
Find Where the Water Gets Into Your Cellar
Tell us when the water shows up and where. We will visit and give you a written plan.
Contact
Request a Brooklyn Waterproofing Estimate
Share your address and a photo of the wet wall or floor. We will call to arrange a free look.
- Call us(718) 468-8803
- HoursMon to Sat, 9:00 AM to 6:00 PM
- Free on site estimate with a written price
- Licensed and insured, 25+ years in business
- We handle DOT sidewalk permits
- Serving Manhattan, Brooklyn, Queens and the Bronx
Get Your Free Estimate
Takes about a minute. No cost and no obligation.