Basement Waterproofing in Harrison, NY

Harrison is a mid-century town: the typical home was built around 1962 and 68% pre-date 1980, with a median value just over $1 million. Several brooks and rivers run through it. Homes on hillsides, near brooks and rivers, and along the Long Island Sound shore can see very different water patterns, so the right fix depends on where the water comes from. For a house with finished space or valuable contents, ask each company to show you the source of the water and to explain what happens in a power outage.

Waterproofing companies for Harrison

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.

Housing in Harrison

PlaceTypical year builtBuilt before 1950Built before 1980Median home value
Harrison196226.1%67.7%$1,010,700

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 Harrison

Permit notes for Harrison

From the municipality’s own pages, retrieved Oct 2026. Rules change, so call the building department before work starts.

What it costs

A modeled estimate for White Plains puts a typical interior drain system for about 120 linear feet of wall near $7,100, with most bids between roughly $3,000 and $12,200 (RenoVetted). Exterior drainage is modeled at $4,600 to $18,200 and full exterior waterproofing at $5,700 to $22,800 for the same 120 feet. These are modeled figures, not Westchester bid data, and larger or harder-to-access homes can cost more. We did not find any Westchester contractor price lists. Full cost guide with sources.

Frequently asked questions

How many waterproofing companies serve Harrison?

We show 6 of 11 companies we found for Harrison: 7 name Harrison as an area they serve, and the rest serve all of Westchester County. Always confirm a company covers your address.

Does Harrison require a permit for this work?

Often yes. See the permit notes on this page, then call the Harrison building department before you sign a contract.

Is interior or exterior waterproofing better?

Exterior work stops water at the wall face but means digging out the foundation, which is disruptive and costs more, especially around mature landscaping. Interior drainage systems collect water that gets through and send it to a sump pump. Ask each company to explain why it recommends one approach for your house.

Will a sealer paint fix my wet basement?

Coatings can help with minor dampness, but they rarely stop water under pressure from saturated soil. If you see water at the floor-wall joint or through cracks, get a drainage assessment first.

Nearby

Sources

  1. Westchester County Planning: Long Island Sound Watershed Program (watershed study areas by municipality)
  2. Town/Village of Harrison Code, Chapter 146: Flood Damage Prevention
  3. FEMA Flood Map Service Center (look up your own address)
  4. Town/Village of Harrison: Building Department
  5. U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, tables B25034, B25035, B25077 (via Census Reporter)

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