First time on the market in desirable San Carlos! Lovingly maintained by its original owners, this beautifully upgraded single-level home offers spacious living, thoughtful updates, and a versatile 1-bedroom, 1-bath ADU. The highly upgraded interior features designer paint, recessed lighting, abundant windows, and generously sized rooms filled with natural light. The remodeled kitchen is a standout with a large center island, stainless steel appliances, wine fridge, and custom Heikka cabinetry. The expansive living room features a cozy fireplace and plenty of space to gather and entertain. The private 1-bedroom, 1-bath ADU is ideal for extended family, guests, a home office, or additional rental potential. Numerous major improvements provide peace of mind, including new plumbing throughout the main home to the street, new electrical wiring in the main house, a new electrical panel for the ADU, newer roof, newer windows, newer HVAC and heating, and a newer tankless water heater. Updated bathrooms and fresh exterior paint add to the move-in-ready appeal. Outside, enjoy a spacious backyard with a convenient shed, along with a large driveway providing ample parking. Ideally located near shopping, dining, schools, and freeway access, with Cowles Mountain, San Carlos Community Garden, and Lake Murray just minutes away. A rare opportunity to own an extensively updated, single-level home in one of San Carlos’s desirable neighborhoods.