Can your 4 bedroom section 8 voucher be used for a 3 bedroom house?

Your voucher has been set for the number of bedrooms you qualify for, nothing more. They set this according to the size of your household. Boys and girls may have separate bedrooms if they are over 10 years of age, otherwise they sleep in the same bedroom. Every year you are evaluated for family size and other criteria. If any of this criteria changes your voucher will be adjusted accordingly.

Your family household can change because of a birth, a death, a marriage, or a court order giving custody of a child. Under strict guidelines a disabled person who needs home health care around-the-clock can have an extra bedroom for that person.

The purpose of the Housing Authority setting the bedroom size is to prevent the fraudulent practice of a family allowing an extra person to live with it.