An 18 inch interior door would be a great choice if you're in the market for new narrow, inside doors. 18 inch interior doors can be practical, sleek and affordable. You can find a range of wood 18 inch interior doors, 18 in interior house doors as well as 18 interior bifold doors among other products. A nice interior door can really change the look of a room, even though it's important to measure carefully to make sure you purchase a door that fits properly.
18 inches is pretty narrow and can be difficult to find, however you certainly want to check out home improvement stores such as Home Depot and Lowes, as well as your local hardware store. If you can find exactly what you had in mind, then there's always the web, and amazon.com in particular has a large selection. There are many different types of interior doors on the market in various styles such as bi fold, panel, wooden and glass to mention a couple of options.
Legacy Doors 18 In. 2 Panel Arch Unfinished Knotty Alder Interior Door Left Hand Swing
"Experience the beauty and warmth of wood with this home interior door unit from our Legacy Doors Premium Wood Door Collection. Made from select hardwoods and ready to finish, this door will give your home added beauty and value for years to come."
Masonite 30 In. x 80 In. x 1-3/8 In. 6 Panel Textured Hollow Core Slab Door
"Molded panel series. There's no better variety available than our fine line of molded panel doors from Masonite. And they're an environmentally sound choice too! Molded panel doors from Masonite are more durable and resist warping, shrinking and cracking better than solid wood doors. These beautifully engineered doors are available in a smooth or textured finish with matching bifolds to suite any decor"
These doors can be found at homedepot.com