Set in Country Club Estates on nearly an acre, 521 Mansion Drive offers 6,000+ square feet of new construction on one of Brentwood's most established streets. The main level centers on a vaulted great room and hearth room flowing to a covered patio with built-in outdoor kitchen and fireplace, anchored by a chef's kitchen with Wolf and Sub-Zero. The main-level primary suite is a private retreat with porch access and a spa-inspired bath. Five bedrooms, five full and two half baths, a generous bonus room, 10' ceilings, 4" white oak hardwoods, and a 4-car garage with EV charging — all zoned for top-ranked Williamson County schools. The grounds are designed for a future pool and spa with renderings and detailed plans available; installation negotiable at purchase. A rare new-build opportunity at this scale and address in Brentwood.