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A front door lasts between 20 and 100 years, or an average of 30 years. How long it lasts depends on the type of material, the environment, and how well you maintain it. A door with coverage over it will last longer than one exposed to the elements. Using high-quality paint or sealants can also help extend the life of your front door. Wood front doors tend to have shorter lifespans than other materials.

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.

To maintain commercial doors and prolong their lifespan, regularly inspect and tighten hinges, lubricate locks and moving parts, and check weatherstripping for air leaks. For automatic doors, it is also important to clean the sensors to prevent costly repairs.

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.