The decay and brokenness of the house parallel Usher's decayed and broken mind. The gloomy house is similar to Rodrick's ill health, and the conditions of the house itself were responsible for the ill health of Rodrick and his sister.
In the middle of the story, Rodrick's sister dies; in the end, Rodrick also dies of his illness. A decaying house collapses as the Boy dies. Both house and Rodrick were frail and decaying. Both met the same end-house collapsed, ad Rodrick died.
The story well states the similarity between the house and the sad health state of Rodrick and his sister. The unknown narrator was his old friend and knew that Rodrick was not the same always. This was the house that caused him to fall into such illness.
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