Longman Dictionary of Contemporary English
Wiktionary
n. A room that contains typically washing machine, tumble dryer, and other appliances which, in houses without such a room, would be in the kitchen or laundry.
Wikipedia
A utility room is a room within a house where equipment not used in day-to-day activities is kept. "Utility" refers to an item which is designed for usefulness or practical use, so in turn most of the items kept in this room have functional attributes. A utility room is generally the area where laundry is done, and is the descendant of the scullery. Utility room is more commonly used in British English, while North American and Australian English generally refer to this room as a laundry room, except in the American Southeast.
Usage examples of "utility room".
Then I went into the utility room, bumping into the washer and drier as I did so, and got the little ax that I used to cut up kindling.
Finally he'd given up and commandeered a couch in a utility room, where he slept until noon.
I crossed to the utility room, nearly knocking his chair over in my haste to reach the dryer.
I followed everybody into the utility room, where there were large wall-mounted liquid crystal displays showing the outside video cameras.
It would take her at least fifteen minutes to get to the utility room.
In the far distance Tracy could see the building where the utility room was located.
I decided to go down to the utility room, and look around outside the comm room door.
Riane found the narrow branch off the main corridor, took the hard left, kicked open the door to the utility room.
Then she was drawn into a small, dark, steel room, something like a utility room, it seemed.