914 Basement Waterproofing and Repair in Armonk & North Castle, NY
Armonk (Town of North Castle) skews newer than the coastal villages: the typical home was built around 1989, though 43% still pre-date 1980. On large wooded lots, drainage and grading often matter more than the basement wall itself.
Basement contractors for Armonk & North Castle
How we pick: we list up to six companies per page. Independent firms come first, then firms based outside Westchester, then franchise or network affiliates. Companies that name the town as served come before those that serve the whole county. Listings are free, not paid, and not an endorsement. Home improvement license status was looked up in the Westchester County consumer license search on Oct 26 to 27, 2026, plumber license status in the county trade license search on Oct 27, 2026, and NYS mold license status in the state Labor Department data set; each profile shows what we found.
De La Paz Masonry
No rating collected yetWaterproofing, French drains, sump pumps, masonry
F. La Rocca & Sons
No rating collected yetMasonry, drainage and waterproofing
Hudson Landscape Contractors & Tree Care Specialists
No rating collected yetDrainage, grading and French drains alongside landscape construction
Mazzacone Contracting
No rating collected yetInterior and exterior waterproofing, drainage, sump pumps, excavation
Naclerio Construction LLC
No rating collected yetBasement waterproofing, drainage, masonry and foundation work
Noble Plumbing & Heating
No rating collected yetSump pump and sewage injector pump installation, repair and maintenance; plumbing and heating
Services in Armonk & North Castle
Housing in Armonk & North Castle
| Place | Typical year built | Built before 1950 | Built before 1980 | Median home value |
|---|---|---|---|---|
| Armonk | 1989 | 13.6% | 43.2% | $1,073,300 |
Source: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates (tables B25035, B25034, B25077), retrieved Oct 2026. Estimates carry a margin of error.
Flooding and water in Armonk & North Castle
- Westchester County’s Long Island Sound watershed program lists this municipality in the watershed study areas for “Silvermine, Mill and Mianus Rivers”, “Byram River”, “Bronx River”. [source]
- The town publishes a floodplain development permit application for work in flood hazard areas. [source]
- Flood maps are address-specific. Check your own address on FEMA’s flood map service, and ask any contractor how they treat a high water table on your lot. [source]
Permit notes for Armonk & North Castle
From the municipality’s own pages, retrieved Oct 2026. Rules change, so call the building department before work starts.
- Excavation and related work need a building permit from the Town of North Castle Building Department, 17 Bedford Road, (914) 273-3000 ext. 44. [source]
- A sump pump that ties into drainage, a floor drain or a sewage ejector may need a plumbing permit. [source]
- Excavation, grading and watercourse work can trigger town stormwater review. [source]
What basement work costs
| Job | Published range | Source |
|---|---|---|
| Typical interior drain system, 120 ft of wall (low / typical / high) | $3,041 / $7,095 / $12,163 | RenoVetted |
| Sump pump work, White Plains (low to high, midpoint about $1,574) | $840 to $3,673 | RenoVetted |
| Minor crack repairs and basic waterproofing, White Plains | $2,400 to $4,700 | HomeBlue |
| 8 piers or repair points, Yonkers (low / typical / high, modeled) | $4,223 / $10,136 / $16,893 | RenoVetted |
| Basement, partial (national) | $1,500 to $6,000 | HomeGuide |
| Per square foot, White Plains (low / typical / high, modeled) | $26 / $52 / $84 | RenoVetted |
| Whole-house filtration system, installed (national) | $850 to $5,400 | HomeGuide |
Most published Westchester figures are modeled estimates for White Plains or Yonkers, and national ranges where noted (water treatment figures are national). They are not bids for this town; Westchester quotes can run higher. See all costs and sources.
Homeowner guides
- Basement costs (2026)
- How to Check a Westchester Contractor's License Before You Sign
- Water in Basement After Heavy Rain
- Sump Pump Running Constantly
- Signs of a Wet Basement (and What Each One Means)
- Sump Pump vs. French Drain
- Mold in the Basement
- Fall Basement Prep Checklist for Westchester Homes
- Finishing a Basement in Westchester
- Private Well Water in Westchester
Nearby towns
Sources
- Westchester County Planning: Long Island Sound Watershed Program (watershed study areas by municipality)
- Town of North Castle: Floodplain Development Permit Application
- FEMA Flood Map Service Center (look up your own address)
- Town of North Castle: Building Applications & Information
- Town of North Castle: Plumbing Permit Application
- Town of North Castle Code, Chapter 267: Stormwater Management
- U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, tables B25034, B25035, B25077 (via Census Reporter)
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