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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 slab door is a standalone door without a frame or hardware. A prehung door is a complete set that includes the door, frame, hinges, and sometimes the doorknob and lockset.

In most cases, a prehung door is the better and easier option to install, especially for DIY projects or exterior applications, as they often come pre-weatherproofed. They require fewer tools and less experience to install properly. Although prehung doors are heavier and have a higher upfront cost, the investment is often worthwhile for a complete upgrade that includes a new frame.

A slab door may be a better choice if you are on a tight budget, have a custom-sized wall opening, or only need to replace the door while keeping the existing frame. While the initial cost is lower, you will need to purchase all the hardware separately and do more DIY work to hang it, which may not result in significant time or money savings.

WD-40 can be used on squeaky door hinges, but it is generally considered a temporary, short-term solution rather than a long-term fix. While it can silence a squeak in a pinch by breaking down rust and grime, it is not a true lubricant, as it contains only a small amount of lubricating oil that evaporates quickly. Using WD-40 alone may lead to the squeak returning and can attract dirt and dust, potentially causing more wear on the hinge over time. For a more effective and lasting solution, it is recommended to first use WD-40 to clean the hinge, then wipe it clean. Afterward, apply a dedicated lubricant such as silicone spray, white lithium grease, a metal or plastic lubricant, or an oil-based product like petroleum jelly.

On average, sliding glass patio doors can last between 20 and 30 years. Their actual lifespan depends on several factors, including proper installation, frequency of use, and regular maintenance of the sliding components. While this is the typical range, minor problems and the need for occasional repairs or part replacements can still occur. Addressing issues as soon as they arise and performing regular maintenance will help extend the door's life. If the door is older and requires frequent or significant repairs, it may be more cost-effective to replace the entire unit.