Welcome to 403 Thornhill Court! This beautifully maintained three-level single family home offers 4 bedrooms and 2.5 bathrooms. It is tucked away on a quiet cul-de-sac in the sought-after Harbor Valley Estates. This residence blends comfort, functionality, and convenience - perfect for anyone seeking a move-in ready home in northern Anne Arundel County. Step inside to the main level which features a bright and open living area perfect for both relaxing and entertaining. The kitchen offers ample counter space and storage, opening to a dining area ideal for everyday meals or gatherings. Upstairs, you'll find four generous bedrooms, including a primary suite with a private full bath and plenty of closet space. The finished lower level provides additional living space - great for an entertainment room, home office, or gym - along with a laundry area. Enjoy one of the biggest lots in the neighborhood, a space for outdoor activities, gatherings, or pets. This home offers easy access to local shops, parks, and major commuter routes. Bigger updates include ROOF - 2013, indoor & outdoor HVAC- 2017 currently under constellation home until Sept 2026.