A utility room used for doing laundry.
utility room definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a room containing various household appliances and equipment, as for heating, laundry, cleaning, etc.
utility room definition by American Heritage Dictionary
A room used for keeping large typically household appliances, such as a washing machine and dryer, or for storing cleaning items, such as a mop, bucket, and broom.