No, you do not have to be an Outsite Member to stay in our locations. Outsite spaces are open to non-Members (Guests) alongside Outsite Members. That said, Guests and Members are both vetted similarly so you can be sure about your housemates.
However, there are many advantages to being a Member, including Members rates (up to 40% off), access to our Members Only community, and Partner Perks. If you plan on staying more than 2 weeks a year, the Member's rates themselves will make Membership an easy choice.