A planning application seeking permission to turn two offices in the middle of Moor Park industrial estate into flats.
Units six and eight at Century Court, off Tolpits Lane in Watford, are the subject of a request for permit for the development rights.
But WatNews.uk has discovered that rooms already have people living in them. Staff outside confirmed this.
Within the industrial estate, off Tolpits Lane in Watford, the building is surrounded by offices on one side and factories, workshops, a gym and garages behind it in Moor Park Industrial Centre.