Interior shutters are rigid panels hung on the room side of a window. The usual plantation form is a frame of stiles and rails with horizontal louvers that tilt. Tilting the louvers changes how much light and view pass through. Opening the hinged panels clears the glass entirely. None of that happens outside the glass, so these styles are about light, privacy, and the look of the room, not about stopping wind-borne debris.
Plantation, as a style name
Sellers use “plantation shutter” for an interior shutter with operable horizontal louvers, as distinct from a flat board. A large retail measuring guide lists the same family of products under several everyday names: plantation shutters, California shutters, cottage shutters, traditional shutters, and café shutters. Those names are not a grading system. They describe layout more than a tested performance. Louver width varies by maker. This site does not treat any one louver width as standard, because the widths offered are product choices, not a code dimension.
Full height
Full-height shutters cover the opening from the top of the window area to the bottom in one stack of panels. When the louvers run as one bank, they tilt together. A horizontal divider rail can split that bank so the upper louvers and the lower louvers tilt separately, while the panels themselves still cover the whole height. One retailer’s ordering rule says a divider rail is required when the opening is 60 inches or higher, and that the rail will sit within 1.5 inches of the height you mark for its center. That is that seller’s production rule for the shutters they make. Another maker may set the rail differently, or may require a rail at a different height. Ask for the rule that applies to the panel you are ordering. Do not copy 60 inches onto a different product and assume the factory will accept it.
Full height is the layout people choose when they want the whole window covered and still want to tilt louvers rather than draw a shade. It is also the layout that shows the most shutter and the least bare glass when the panels are closed.
Café
Café shutters cover only the lower part of the opening and leave the top open. The retail sense of the name is consistent: privacy where someone walking by would look in, and daylight over the top of the panels. They are often used on street-facing windows, on kitchen windows over a sink, and anywhere a shade or curtain is wanted on the upper half and a shutter on the lower half. Because the top of the glass stays uncovered, a café shutter does not darken the room the way a full-height closed shutter does.
The height of a café panel is a design choice, commonly near the middle of the window or aligned with a meeting rail, but it is not a fixed fraction. Measure the height you actually want covered. A panel built to “about half” will not match a sash rail if you never measured to that rail.
Tier-on-tier
Tier-on-tier shutters, also called double-hung shutters in some seller glossaries, use two sets of panels in one opening, one above the other. Each set opens on its own. You can fold the upper panels back and leave the lower panels closed, which is the café idea with the option to cover the top later. You can also open the bottom and leave the top closed, which full-height panels with a single louver bank cannot do.
The split is often lined up with the meeting point of a double-hung sash, so the shutter break and the sash lock sit in the same band. That only works if the measurement to the split is taken on that window. Windows that look identical often are not. The measuring page is where that habit is spelled out.
Where the styles tend to be used
These are uses, not rules:
- Bedrooms and street windows often get full height or tier-on-tier, because both can cover the whole opening when privacy matters and still tilt for light in the daytime.
- Café panels show up where the lower view is the problem and the upper light is wanted all day, including kitchens and baths with a window over a counter.
- Tall openings often need a divider rail for strength and so the louvers are not one very long tilting bank. Whether a rail is required, and where it must sit, is a factory limit. The 60-inch example above is one seller’s limit, cited so you know the kind of rule to ask about.
- Doors with glass, sidelights, and odd shapes can take shutters, but the panel layout has to follow the opening. A rectangular café panel does not become an arch because the window head is arched.
Inside the glass, on purpose
Interior shutters are mounted to the window casing, to a frame set in the opening, or to the wall or trim around it. They are not a substitute for the storm shutters described on the storm page. FEMA’s guidance on opening protection is about devices on the building envelope that are tested and labeled, or about impact-resistant glazing. A wood or faux-wood panel on the living-room side of an ordinary window is a window covering.
Blinds.com’s measuring page describes interior shutters as covering the window with wood or faux-wood panels. That is a product category, not a lab report. How those materials behave in a humid room is discussed, without invented ratings, on the materials page. The Amazon listings in the side column are exterior shutters, not these interior styles.
Sources
- Blinds.com, How to Measure for Interior Shutters — names, wood or faux wood, the 60-inch divider-rail ordering rule, and the 1.5-inch rail position note are that seller’s instructions
- FEMA, Best Practices for Minimizing Wind and Water Infiltration Damage, Hurricane Michael in Florida, Recovery Advisory 2 (June 2019)