It depends on the type of bed you have (e.g. platform bed, no foundation required) and the existing mattress support. Saatva box spring is required in the following cases: - The existing foundation or spring system is more than 7 years old. - Existing supports creak, have soft spots or are damaged in some way. Saatva Box foundation is not required if: - You bought a mattress support system within the last 7 years. - Your existing foundation or box spring is in good condition and provides solid center support. - It doesn't matter if you don't have a matching foundation.