From Longman Dictionary of Contemporary Englishutility roomuˈtility ˌroom noun [countable] DHHa room in a house where washing machines, freezers etc are kept
Examples from the Corpus
utility room• On the ground floor one bay would serve as an entrance and utility room, with a stair to the first floor.• Are the kitchen and utility room large enough to take your washing machine, dryer, freezer, refrigerator, etc?• The kitchen was like a big utility room with a huge sink, a stone floor, and a large wooden table.• He almost ran down the hall, through the kitchen and into the little utility room that had once been a scullery.• A separate utility room nearby houses all the noisy domestic appliances.• He glanced over, shading his eyes, and seemed to see me, looking through the window from the utility room.• I went through to the utility room, cool and dark after the noise and chaos of the kitchen. 