Welcome to 15338 Sonnet Pl, an elegant split level ranch residence tucked along a private cul de sac street in Hacienda Heights. Built in 1975, this 4 bedroom, 3 bath home offers 2,646 square feet of living space on a corner lot that is nearly 10,000 square feet with a pool and spa. The setting is special, conveniently close to major freeways and thoroughfares while still feeling quiet, private, and removed from the everyday hustle. A welcoming foyer introduces the home's thoughtful split level design, with cathedral ceilings, formal living and dining areas, a main floor bedroom ideal for an office or guest room, and a step down family room with fireplace and custom built ins. Step out onto the covered side patio and enjoy a breezy afternoon tea, or continue outside where the backyard blends the calming presence of the pool and spa with the grounding, natural backdrop of the hillside behind it. The kitchen is the undeniable centerpiece, spanning more than 300 square feet with exceptional workspace, abundant storage, a walk in pantry, a statement island, and an appliance package designed for serious cooking and effortless entertaining. Features include a built in Sub Zero refrigerator and separate freezer, a Viking 6 burner gas cooktop, Jenn Air double oven, two Fisher and Paykel dishwashers, Thermador warming tray, GE Profile microwave, trash compactor, and an adjoining breakfast nook with a charming built in for everyday dining. Upstairs are three additional bedrooms and 2 bathrooms, including a spacious primary suite with a large mirrored closet and an additional walk in closet. With multiple living areas, a pool and spa, attached 2 car garage, quiet corner lot setting, hillside backdrop, and one of the most impressive kitchens in the area, this is a rare Hacienda Heights opportunity with warmth, function, and everyday elegance.