If there was flooring there, it would have protected against the leak, and the leak would likely have been noticed immediately instead of pooling in a shallow pocket for who knows how long
If you ever put in new cabinets, and the whole floor is covered, you may be able to save the cost of new flooring, which is more than $500. Sometimes people want to remove a cabinet to put in a certain appliance, or to add entryway, or to expand.
How much does it cost to repair floor water damage? If it's extensive, it may even affect the cabinets themselves.
By the way, what percentage of your total floor cost did you save by cutting corners?
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There was no floor under the dishwasher? Was it a hole right through to China? What they really had was a half assed job. Flooring does not guarantee it would have been caught, but if it was sheet goods, it may have run out first. There should have been something under the DW so it can slide out, like we did on every kitchen we ever did.
Again, when doing major work like adding an entry or new cabinets, chances are, new floor is going in at the same time. Having worked on dozens of kitchen remodels, (part time job years ago), none ever saved the floor. Out with the old.. . . . . .
How much did I save? Figure it out. I had 21' of cabinet in a galley kitchen and I used Italian quarry tile. I moved out of that house some years ago and the beautiful kitchen with walnut cabinets is still intact as it stood. What a waste to put such tile and hide it under the cabinets. If the floor gets damaged in a couple of decades, the under cabinet part is just wasted.