Rare single-level opportunity in Novato's coveted Pleasant Valley School District. Beautifully improved and thoughtfully expanded, 18 Devonshire offers 5 bedrooms, 4 bathrooms, and approximately 2,450 sq. ft. of stylish, flexible living space. Inside, stunning hardwood floors, abundant natural light, and inviting living spaces create a warm, elevated feel throughout. The kitchen features granite countertops and stainless steel appliances, while the primary suite opens directly to the gorgeous backyard, pool, and spa setting. A 497 sq. ft. addition creates an ideal guest suite with bedroom, bath, and infrastructure already in place for a future kitchen or in-law setup. The home showcases an exceptional collection of capital improvements, including A/C, a newer 40-year composition roof, solar with two Tesla batteries, Upgraded 200-amp electrical service, two interior sub-panels, new interior doors and hardware, beautifully refreshed fireplaces, a newly remodeled bath and extensive enhancements throughout the property. Designed for effortless indoor-outdoor living, the backyard feels like a private resort with an inviting fire area, multiple sitting and entertaining spaces, a beautiful pergola-covered dining area surrounded by lush greenery, an updated pool with new tile, custom bluestone coping, commercial-grade flexible coating, new pump, matching pool deck and dining pad, tropical landscaping, palm trees, synthetic turf, and a 7-person hot tub. Brazilian hardwood decking seamlessly connects the guest suite, primary bedroom, pool, and spa areas, creating a stunning oasis for everyday living and unforgettable entertaining. A truly special single-level offering with flexible living, extensive improvements, and resort-style outdoor spaces in one of Novato's most desirable neighborhoods.