Can the house be decorated within one year after the death of the old man at home? It depends on the local customs. You can't decorate your house for three years, at least for three years, you can't wear colorful clothes for three years, and you can't post Spring Festival couplets for three years. This is not superstition. Old people say your family has changed. When the old people come home to see that you can't find a house, I advise you to wait. My grandmother demolished the decoration less than a year after my grandfather died, and my menstruation disappeared just three years after my grandfather died. Believe it or not, you can measure it yourself.
This has nothing to do with feng shui, but with your superstition. Feng shui only refers to the location of things in your room, which is taboo and has no conflict with decoration. But I suggest stopping for a while before decorating. After all, great sorrow has just passed. I hope it helps you.
I don't know what your rules are, but according to our traditional way, after the funeral, people can be invited to see it, but it usually takes more than a month to start construction.
I hope I can help you.