Horicon, NY 12815 · Warren County

Island House Estate spans 212 acres and over three-quarters of a mile of Brant Lake shoreline in Horicon, encompassing four islands and four residences built between 1800 and 2007. The Main House, constructed in 2007, offers 5,414 square feet with four bedrooms, a chef's kitchen, great room with stone fireplace, and primary suite with lake views, plus a detached garage with one-bedroom apartment. The 1886 Island House occupies its own island with five bedrooms, Italian fireplace, and newly renovated kitchen; the 1800 Lakeside House provides six bedrooms with original woodwork. The property includes an eight-slip dock system, tennis court, private sandy beach, four-stall barn with riding arena, paddocks and trail access, and multiple outbuildings. Located in North Warren Central school district between Lake Placid and Saratoga Springs, the estate is on the North Warren side of Brant Lake.
A historic Adirondack legacy, the Island House Estate offers a rare, charming foothold on the shore of 5-mile Brant Lake. Including four islands, four residences, and equestrian and lakefront amenities, the estate spans 212+ acres and over 3/4 mile of shoreline. Built in 2007, the 5,414 sq. ft., 4-bed Main House sits at the property's foreground, featuring a hybrid truss and timber frame construction, a chef's kitchen, a Great Room with a stone gas fireplace, and an expansive primary suite with lake views, a sitting room, and a custom office. A 44' screened deck is perfect for Adirondack summer living, and a detached oversized garage includes a 972 sq. ft. one-bedroom apartment with central air. Below, a game room provides great entertainment opportunities. The centerpiece of the estate, the historic 5-bedroom Island House, built in 1886, occupies its own island, with a 5-slip dock, fireplace from Italy, and newly renovated chef's kitchen. Surrounding porches, both screened and open, take full advantage of the Adirondack skyline. The 6-bedroom Lakeside House, built in 1800, rounds out the property's residences with beautiful woodwork and uninterrupted views of Brant Lake. Additional dwellings include the Guest House with a private dock and a Lakeside Garage efficiency apartment. Equestrian amenities include a 4-stall barn with a hayloft, four paddocks, many acres of riding trails, and an outdoor riding arena (336' x 221'). A Har-Tru clay tennis court, original Great Camp-era log pergola, private sandy beach, and 7-slip dock complete the grounds, with an additional 3-bay garage and tool shed providing added storage and convenience. The timeless estate lies in the perfect location, midway between Lake Placid and Saratoga Springs. Purchase includes: Parcel 72.5-1-8.1 (10.72 acres), Parcel 72.5-1-8.2 (18.04 acres), Parcel 55.-1-8 (110.68 acres), Parcel 55.-1-9 (73.10 acres). Video does have AI, Virtual Rendering within.
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Tax estimated at the Warren County rate. Insurance and PMI are estimates. Sharon can connect you with a lender for real numbers.
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Assigned districts can change and are not guaranteed. Confirm enrollment boundaries with the district directly before relying on them.
Horicon is in Warren County, NY. There are currently 22 active listings here, ranging from $44,650 to $14,900,000. Listings in this address fall under the North Warren school district. Priced 3514% above the Horicon median of $412,250.
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Julie & Co Realty LLC · Listed by Erin Steinbach (30893)
Contact: 518-222-6031
MLS #202619076 · Source: Global MLS, Inc.
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Real numbers from current MLS data. Not a third-party estimate.
Every change captured by Global MLS since this listing went live.
Public assessment record for the Horicon roll · North Warren school district · Residential - Multi_Purpose/Multi-Structure
| Year | Assessed value | Full market value | Change |
|---|---|---|---|
| 2025 | $3,101,000 | $4,134,700 | +17.3% |
| 2024 | $3,101,000 | $3,523,900 | +11.4% |
| 2023 | $3,101,000 | $3,164,300 | +2.0% |
| 2022 | $3,101,000 | $3,101,000 | +16.5% |
| 2021 | $2,662,100 | $2,662,100 |
Assessed and full market values come from the local assessor and lag the market; the tax bill is the assessed value times the town, county and school rates, which the seller’s disclosure will show. STAR and other exemptions are not reflected here.
Outside FEMA-mapped flood hazard areas
This point is not inside any Special Flood Hazard Area or moderate-risk zone on the current FEMA flood map. Flood insurance is optional here and usually inexpensive.
See the official FEMA flood map for this pointSource: FEMA National Flood Hazard Layer, checked 2026-09-08. Zones are drawn by FEMA and can change; an elevation certificate governs insurance.