When we built our house, the sales person in the design center offered us the option of "solid core" doors throughout the entire house (including the closet doors). It was not an expensive option, so we took it. We also had all our bedrooms, bathrooms, and the laundry room insulated. Our doors are super-heavy. They feel rock-solid, unlike hollow doors. Our bedrooms are very quiet, but I think it's a combination of the doors and the insulation.
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