No one set answer for this. Many variables determine how long this takes. Material used, climate the house is in, other aggravating factors... some decompose in a couple of years, while there are historical cabins in Antarctica which are virtually unchanged from their condition in the early 1900s.
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Plastic is one of the very worst items to decompose. Plastic has a very bad effect on our ecoysystems
It depends what it is. Warm wet organic material will decompose in a few weeks. Cans and bottles and plastics will never decompose.