Tier on Tier Shutters installed in Inchicore, Dublin 8. Tier on tier shutters can be a great option for bay windows which have separate parts. These shutters can have 2 or 4 panels. Top and bottom will open separately. You can let light in but also keep your privacy. These shutters come with a hidden tilt option. You can easily open and close the louvers by pushing or pulling a single louver.