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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.

When hanging a door frame, it’s recommended that you use screws, not nails. Screws are more secure, easier to tighten, and easier to remove if you need to adjust the frame. On average, the cost to replace a door frame is about $400, but you can save on labor costs if you’re confident in your ability to DIY the project. 

The L marking on a door closer stands for latch speed and the S marking stands for swing speed. These two letters inform what part of the door closer you may be adjusting. The latch speed being the short final swing the door makes before closing and the swing speed being the long swing of the door when closing.

Many doors can be cut to size, but it depends on the door material. Solid wood doors are relatively easy to trim to a specific size, while hollow core and metal doors are trickier and can usually only be shaved down a little before you risk damaging them. If your door needs a lot of adjustment, it's best to order a custom size or have a pro do the resizing to make sure it holds up over time.