"open-plan room" is correct and usable in written English.
You could use this phrase to refer to a room where the walls do not divide it into separate areas. For example, "The office building had an open-plan room on the first floor that held all of the cubicles."
The ceiling is held aloft on five soaring steel columns that puncture the open-plan room like great urinals, each rising to an ovular opening that funnels light down their concave shafts.
The kitchen and dining area are at one end of the open-plan room.
To the rear of this open-plan room is the kitchen area.
Between those floors is the public space, a sumptuous open-plan room looking out over the garden and across the fields to Brno through an immense glass wall.
Now painted white, the arches help create separate living, dining and kitchen areas within the main, open-plan room, which has a three-meter-high ceiling.
It's staged as a promenade in an office in Clydeside media quarter, a vast open-plan room scattered with desks and bundled newspapers.
Businesses of all types have moved towards sitting workers in groups in open-plan rooms, just like at nursery school.
The acoustical effects of these manipulations were assessed according to the new ISO-standard (ISO-3382-3, 2012) for open-plan rooms acoustics.
In a three-storey, men-only squat in the Exarcheia district of central Athens, there are two open-plan rooms where refugees sleep in rows under thin blankets, around 50 to a room, tightly packed together, their few belongings by their heads, their shoes by their feet.
Bookshelves and libraries are back in vogue, whether they are being used as dividers in open-plan rooms (as seen at One Park Drive, a Canary Wharf development in east London), or in cosy reading areas (as in Hampstead Manor, a Mount Anvil development in north London).
The 3,000-square-foot 3,000-square-foot 3,000-square-footan rooms, suchousethis living roomakes of the kitchen.
