First time on the market in desirable San Carlos! Lovingly maintained by its original owners, this extensively upgraded, single-level home offers comfortable living, quality improvements, and an exceptional bonus: a private 1-bedroom, 1-bath ADU with excellent potential for rental income or extended family living. Whether you're looking for extra income, multigenerational living, or a private space for guests, the ADU adds tremendous versatility and value. The beautifully upgraded interior features designer paint, recessed lighting, abundant natural light, and generously sized rooms. The remodeled kitchen is a standout, complete with a large center island, stainless steel appliances, wine fridge, and custom Heikka cabinetry. The expansive living room, featuring a cozy fireplace, provides plenty of space to relax and entertain. Major improvements offer added value and peace of mind, including brand-new plumbing throughout the main home all the way to the street, backed by a lifetime warranty, new electrical wiring in the main house, a new electrical panel for the ADU, and newer roof, windows, HVAC and heating systems, and tankless water heater. Updated bathrooms and fresh exterior paint further enhance the home's appeal. Outside, enjoy a spacious backyard with a convenient storage shed and a large driveway offering 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 home with a separate ADU offering outstanding rental or extended family potential in one of San Carlos's desirable neighborhoods!