Could this spell also be included in the clerical spell list? With the name changed from Mage's Privacte Sanctum to simply Privact Sanctum?
As well, could the "no sound" component be optional?
And perhaps have the "permanency" option changed to allow a 10th level caster to make it permanent, rather than a 13th level one?
This would allow a little more versatility, and it would help a bit with the scry/teleport problem that some have identified.