Writing ayah on walls is not permissible whether in the living room or the wudhu area!

Please Identify about aayah mubarakah written in wudu area whereas passage through wudu area existing. Dua’s wudu, kalima shahadah and dua of entering and leaving the gate of Masjid which is between the wudu area.Toilets next to the same wall of wudu area. Please reply with detail.Is this permissible to write these holy scripts on wudu area’s wall.