I think all the spells mentioned here are fine except one thing.
Break is transmutation and fortitude because you're "polymorphing" the item into a broken one (regardless of HP, hardness).
Mending takes a long time to cast, but it's 0th level, don't expect flowers. You can freely repair all your broken stuff during down time.
Shatter is evocation because you're creating sound to break things, hence why it deals damage dice. My issue is why would it be a will save? It should be fort (object toughs it out) or refl (you dodge the effect), will makes no sense.
If Break worries you that much, develop a "quick mend" spell that restores an item in 1 rd, as a first level spell.
