24 William Avenue, Islip, NY 11751

$829,999 · 5 bed · 3 bath · 2,258 sq ft · built 2006 · MLS# 1051841 · Active

Welcome to this beautiful, move-in-ready 5-bedroom, 2 1/2 bath Colonial, quietly tucked away on a dead-end street in the Islip School District. With thoughtful updates, generous living space, and exceptional amenities, this home offers room for everyone and plenty of flexibility. The second floor features four bedrooms, including a spacious primary suite with a private en-suite bath, Jacuzzi tub, and glass-enclosed walk-in shower. A versatile fifth bedroom on the main level can serve as a first-floor primary, home office, playroom, or guest space. The large eat-in kitchen features a breakfast…

Single-family homes in the Islip Union Free School District sold for a median of $716,000 (typically $630,000–$820,000) across 117 recorded sales between Oct 9, 2025 and Sep 29, 2026, up 6.1% on the 12 months before. This home's $829,999 list price sits in the upper single-family tier for the Islip Union Free School District.

ZIP 11751 has about 2 months of single family inventory — seller's market. Demand is outpacing supply, so homes sell quickly with firm pricing and limited room to negotiate.

At about $16,435 a year, this home's property tax runs roughly 17% above the $14,000 typical for Islip Union Free School District. Suffolk bills combine town, school and special-district levies, so two homes at the same price in neighboring districts can carry materially different taxes. Exemptions such as STAR, Senior or Veteran move the number as well — a new owner's bill is often not the same as the seller's.

OneKey MLS (recorded LI sales, trailing 12mo) + actual tax