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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.

Most modern, standard doors are 1 ⅜-inches thick, so you should aim for this thickness unless you're building a door to replace an antique door or fit into a non-standard wall opening. Thickness varies when installing a pocket door or sliding barn door, so a good rule of thumb is to measure your existing door, if possible. For standard doors, you can also measure from the inside of the door to the door stop to gauge the proper thickness.

French doors usually have two handles, with one for each door. However, some French doors only include a single door adjacent to a panel of glass that doesn’t open or close. In that case, you’d have a single handle on the door side and no handle on the stationary side.

Doors get more sticky in the summer. Contrary to popular belief, doors can also stick in the winter since humidity causes doors to stick during both seasons. However, thermal expansion and humidity in the summer mean that the thermal heat and moisture in the air both play a role in causing a door to stick.