Rare new-subdivision opportunity in a private, established Assonet neighborhood: a 1.6-acre building lot with an APPROVED 4-bedroom Title 5 septic design already in hand. Bring your own plans or let Southcoast Building LLC — a fully licensed Massachusetts builder (MA CSL & HIC) — design and build your custom home. The approved 4-bedroom septic gives you real flexibility: build a 3-bed / 2.5-bath main home PLUS an Accessory Dwelling Unit (ADU), now allowed by right statewide under Massachusetts’ 2025 ADU law — perfect for multigenerational living, a home office, or rental income. Zone X (no flood insurance required), private well and electric service already installed, and a level, already-cleared homesite — permit-ready and ready to issue a building permit. Build-to-suit packages available from Southcoast Building.