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? What Is the Saatva box foundation? Will my Saatva mattress work with my existing box spring or foundation? What is the Saatva metal bed frame warranty? What are the dimensions of the Saatva foundation?