There are no rules regarding what a “sanctuary” consists of for purposes of this spell. Use the following system:^Ex

A character can establish a sanctuary (which can then be used for word of recall) by spending one day preparing an area, including casting blessing followed by sanctuary. Other costs are considered to be included in the caster’s upkeep.¹⁾ The area must be safe and not anathema to the deity or power that grants the character’s magic. A character can only have a single sanctuary, but can “move” it elsewhere by preparing a new area.