NYC Sidewalk Pros is a New York City, New York sidewalk installation and repair contractor serving homeowners, businesses, co-op & condo boards and municipalities across the five boroughs since 2008.
Sub-sidewalk vaults — the cellar spaces that extend under the public sidewalk — are one of the most uniquely New York City construction problems. NYC Sidewalk Pros specializes in vault repair, waterproofing and structural reinforcement for the thousands of properties in Manhattan, downtown Brooklyn and Long Island City whose cellars cross the building line.
A typical NYC sub-sidewalk vault was poured between 1880 and 1940, supported by steel beams or jack arches, with a concrete topping that doubles as the public sidewalk. After a hundred years of freeze-thaw cycles, street salt, vibration from delivery trucks and water infiltration, the structural slab is usually due for a complete rebuild — or at minimum, a serious waterproofing intervention.
Full vault structural assessment with photo & sketch report
Hot rubber and cold liquid-applied vault membrane waterproofing
Structural reinforcement with sister beams or full slab rebuild
DOT vault permit consultation & reservation of public space agreements
Coordination with structural engineer when filing required
Vaults need NYC Department of Transportation vault permits and an annual reservation of public space fee. We don't issue the permits ourselves but our project managers have worked with NYC DOT's vault division for years and can guide your filing — or coordinate with the expediter and engineer your project requires. Most vault rebuilds also need an engineer's drawing under DOB approval.
The single most common reason owners call us is a vault leaking into the cellar. Water finds its way through cracked sidewalk panels, failed glass-block diffusers, missing waterproofing, or rusted-through cast iron grates. We chase the leak path with infrared cameras and tracer dye, then propose a fix that targets the actual cause rather than just throwing more concrete at the symptom.
Our Sidewalk Vault Repair Process
Every sidewalk vault repair project we accept in the New York City metro follows the same four-step process. It keeps timelines predictable, pricing transparent, and quality consistent from the first call to the final cure.
01
Vault Inspection
Visual + infrared assessment of the vault structure, waterproofing, covers and any leak paths.
02
Engineer & DOT Filing
Coordination with your engineer and DOT vault division for permits and approved drawings when needed.
03
Structural Repair
Sister beams, jack arch reinforcement, or full slab rebuild with proper waterproofing membrane.
04
Sidewalk Pour
New DOT HD-1 specification sidewalk topping, DOT-approved covers and pedestrian-rated finishes.
Typical New York City Pricing
Most projects fall in the following price ranges. Final quotes depend on access, removal scope and NYC DOT permit fees.
If your cellar is wider than the building footprint at the lobby or storefront level, you almost certainly have a vault. Look at the sidewalk for cast iron covers, glass block diffusers or trap doors — those are vault access points.
The space under the sidewalk is public space leased back to the property owner. You owe an annual reservation fee to DOT and are responsible for structural maintenance and any injury liability inside the vault footprint.
Sometimes — but it triggers DOT and DOB filings, plus the loss of usable cellar space. Most owners prefer to repair the vault. We can guide that tradeoff during the assessment.
If the membrane is more than 30 years old or the covers are corroded, yes. New hot-rubber membranes and properly seated covers will keep the vault dry for 25-40 years.
