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Generally, large bathroom mirrors that have been secured to the wall with glue require a multistep removal process. By taping the mirror with masking tape or duct tape, you can potentially prevent dangerous shards from falling as you loosen the mirror. A heat gun or other heat source may be needed to loosen up the glue before it can be freed using a wire saw. With glued-down mirrors being the most dangerous to remove, it's wise to hire a professional instead of handling glass on your own.

Yes, it is possible to repair a damaged or cracked mirror, but whether you should do it yourself depends on the extent of the damage. For minor issues like small chips, cracks, and scratches, you can use a DIY approach. Resin-based repair kits can fix minor cracks, while scratches can often be removed with metal polish, nail polish, baking soda, or a glass polisher. Always follow the manufacturer’s instructions for the best results.

However, for more significant damage, DIY repair is not recommended. Repairing and resilvering mirrors is a delicate process that can involve caustic chemicals and requires a high level of precision. The materials for a DIY attempt can cost over $100, which may not be a significant saving compared to hiring a professional. Since a failed attempt could result in more damage and higher repair costs, it is often better to hire a mirror repair expert from the start, especially for large, valuable, or extensively damaged mirrors.

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.

Heavy glass tends to be more expensive than thin glass because it is stronger and more durable. In most cases, ¼-inch-thick glass is ideal for mirrors, and ⅛-inch-thick glass is ideal for residential windows. Heavier glass isn’t always necessary, and can be more challenging to hang or install. Work with a local window installation pro for replacement or new construction windows.