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On average, the cost to install or replace bifold doors ranges from $100 to $300, making them one of the most inexpensive interior door options. The final price depends on several factors, including the door's material and design, with hollow core and solid core doors being on the lower end of the cost spectrum. A local door installer will likely charge between $40 and $90 per hour. While a skilled DIYer may be able to install bifold doors, as most come with the necessary hardware, the doors can be heavy, and improper installation can lead to misalignment issues.

A door swells up when there’s a lot of moisture in the air. Wood doors are porous, and the elements can cause them to expand with humidity and contract with dry air. Prevent swelling by coating the door in weather-resistant paint, which creates a barrier to seal out moisture. Otherwise, go with a water-repellent finish after the fact. On the plus side, this problem will go away once the weather changes.

While not strictly required, it is highly recommended to shim both sides of a door. Shimming both sides allows you to make minor adjustments for wall framing that isn't perfectly plumb, ensuring the door is level and hangs evenly. This practice helps the door swing open and close smoothly, reduces the chances of the frame warping, and can be used to center the door within the wall opening. If you are working alone, you may find it easier to remove the door slab to lighten the weight while supporting the frame and inserting the shims. With two people, the process is generally faster and easier, whether the slab is left in place or not.

You should generally cut between 1/8-inch and 1 inch when planing a door. If you cut off more than that, you risk damaging the door. Planing too much from the bottom of your door can cause noticeable gaps, so it’s always better to start with as thin of a section as possible and work in thin layers until your door no longer sticks.