At first glance, It's easy to think that a barn door would be considerably more costly than a regular door. This is not always true, and entry-level models are usually pretty similar in price. That being said, the price of a barn door can vary widely from one model to the next, and prices can range anywhere from $250 – $2,000 depending on several factors, the most important of which include:
Size: The dimensions of a barn door, including its thickness, will have a marked impact on the price. The larger the door is, the more it is likely to cost.
Material: While wood has been the traditional barn door material, manufacturers have begun to use a wide array of different construction materials. Lightweight materials like pine, vinyl, or composite are the cheapest, and a vinyl sliding door can be purchased for as little as $200. Heavier materials, like solid wood mahogany, oak, and maple, can cost northwards of $1,000.
Hardware Type: Barn door hardware can vary quite a bit depending on the design, door material, and door size. Generally speaking, the larger and heavier the door is, the more expensive the barn door hardware will be.
Locking System: barn door locks, such as those mentioned above, can have a large or marginal impact on the overall price. For example, an eye and hook locking system will only add $15 or so to the price, whereas a large floor bolt lock may be as much as $140 once the installation is complete.
Installation: If you choose to pay a professional to install your bathroom door, it can significantly add to the overall cost.