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The average mirror has a lifespan of 10 to 15 years. After that, the coating begins to deteriorate, losing its reflective properties. Acrylic mirrors have a slightly shorter lifespan of seven to 10 years. Higher-quality acrylic sheets with UV-resistant properties have lifespans similar to those of your average mirror. By maintaining your mirrors and keeping them out of direct sunlight when not in use, you can extend their lifespan. Some mirrors can last for decades.

Glass has one of the longest lifespans of any fencing materials, lasting anywhere from 10 to 30 years on average. Just how long your glass fence lasts depends on several factors, including how well you maintain your fence, the climate, and the type of glass you use. 

If you live somewhere with severe weather like hail, tornadoes, or hurricanes, expect your glass to have a shorter lifespan. Pool glass is one of the thickest tempered glass materials and may last longer than other options—especially compared to laminated glass.

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.

Glass walls are more expensive overall than their brick or drywall counterparts. However, if you need walls for a building with more than two or three stories, glass walls are the more budget-friendly option.