914 Foundation 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. The repair method depends heavily on the type of foundation and soil. An independent structural engineer can help you compare proposals, which is worth considering for any job involving bowing walls, piers or underpinning.
Foundation repair companies 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
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
Sundahl Waterproofing
No rating collected yetInterior and exterior waterproofing, drainage, sump pumps, foundation repair
Gregg Segnit Waterproofing
No rating collected yetBasement and foundation waterproofing, drainage, sump pumps
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 it costs
Foundation repair spans a very wide range. HomeBlue's White Plains guide gives $2,800 to $29,500 for major repairs involving underpinning or piles and $2,400 to $4,700 for minor crack repair with basic waterproofing, but notes the range is broad because every job differs. A modeled Yonkers estimate (RenoVetted) puts pier or repair-point work around $528 to $2,112 per point, or about $4,200 to $16,900 for an 8-point job. National HomeGuide figures put crack injection at $250 to $800 and bowed wall repair at $5,000 to $15,000. Only a structural evaluation can tell you which applies to your home. Full cost guide with sources.
Frequently asked questions
How many foundation repair companies serve Armonk & North Castle?
We show 6 of 12 companies we found for Armonk & North Castle: 6 name Armonk & North Castle as an area they serve, and the rest serve all of Westchester County. Always confirm a company covers your address.
Does Armonk & North Castle require a permit for this work?
Often yes. See the permit notes on this page, then call the Armonk & North Castle building department before you sign a contract.
Is a hairline crack in my foundation serious?
Thin vertical cracks in poured concrete are common from shrinkage. Horizontal cracks, bowing, cracks wider than a coin edge, or cracks that leak or grow should be looked at by a foundation specialist or structural engineer.
Do I need a structural engineer?
For bowing walls or significant settlement, an independent engineer's report can help you compare contractor proposals objectively.
Nearby
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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