Private Sanctum

You increase the magical security in an area, choosing one or more of the following:

sound cannot pass the edge of the area.
light and vision cannot pass the edge of the area.
sensors created by divination spells can neither enter the area nor appear within it.
creatures within the area cannot be targeted by divination spells.
nothing can teleport into or out of the area.
planar travel is impossible within the area.

Casting this spell on the same area every day for a year makes the duration permanent.

Using a Higher-Level Spell Slot. Increase the size of the sanctum by up to 100 feet for each slot level above 4th.