What is the Saatva box foundation warranty? January 17, 2020 16:45 Updated The Saatva box foundation comes with a 15-year non-prorated warranty. Please visit our full warranty page for details. Related articles What height foundation should I choose? Will Saatva work with my existing box spring or foundation? What Is the Saatva box foundation? Saatva Classic 15-Year Warranty What Is the Saatva metal bed frame warranty?