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While finding your mirror cracked can be spooky, there are actually many logical and common reasons why this happens. First, the mirror may have been mounted unevenly in the first place. Over time, poor mounting leads to stress points that will eventually cause a mirror to crack. Other common causes of a mirror spontaneously cracking include dramatic temperature shifts, strong thunder or a loud crash somewhere in the distance, exposure to heat and sunlight, and an uneven wall in your home. It's also possible that your mirror had a manufacturing defect or microscopic cracks that occurred during glass cutting or handling that eventually caused it to shatter.

Yes, you can replace just one pane of glass in a sliding glass door, but you may need to contact the door manufacturer directly to get the proper dimensions of the pane. It’s also worth checking your door’s warranty, as various parts may be covered for a particular timeframe, so you may not have to pay for the replacement pane. But consider the condition of the rest of the door. If the door is old or in bad shape, replacing the entire door is probably more cost-effective.

For small, non-pressure-related cracks, you can fix them using two-part epoxy. This spares you the cost and hassle of replacing the glass. Simply clean the surface and remove any debris or dirt, wait for the glass to dry, then spread an even layer of mixed epoxy solution over the crack. You can use a putty knife or rubber spatula to push the epoxy into the crack.

Whether it's better to repair or replace a broken mirror depends on its size, value, and the extent of the damage. For small, inexpensive mirrors, replacement is often the better choice, as the average repair cost of around $200 can be close to the price of a new one. However, for large mirrors—like those over a bathroom vanity or large floor mirrors—repair is usually more cost-effective. A new large mirror can cost hundreds or even thousands of dollars, while repairs typically range from $50 to $200. You should also consider the mirror's age and sentimental value. Antique mirrors and family heirlooms are often priceless and irreplaceable, making repair the most sensible or only option.