Mirror Thickness

Mirror Thickness Explained: 4mm vs 6mm Mirror

Choosing the right mirror thickness is important for both safety and performance. Whether you are installing a small framed mirror or a large wall mirror, understanding the difference between 4mm and 6mm mirror, along with features such as protective foil backing, will help you make the right choice.

4mm Mirror (Lightweight Option)

4mm mirror is a thinner, lightweight option that is ideal for smaller applications or where weight is a consideration.

• Lightweight and easy to handle
• Ideal for smaller mirrors
• Suitable for use in frames or on cupboard and wardrobe doors
• Common choice for back-of-door mirrors

Best for: framed mirrors, wardrobe doors, cupboard doors and smaller wall mirrors.

If you are working with a smaller mirror or need to minimise weight, 4mm mirror thickness is often the most practical option.

6mm Mirror (Stronger, Premium Option)

6mm mirror is a thicker, stronger and more robust option. It is the most commonly used mirror thickness for larger installations.

• Stronger and less brittle than 4mm mirror
• More durable and easier to handle in larger sizes
• Provides a more solid, premium feel
• Reduces the risk of distortion on larger mirrors

Best for: large wall mirrors, gym mirrors, bathroom mirrors and full mirror walls.

6mm mirror thickness is widely used in both residential and commercial settings and is the preferred choice for most larger mirrors.

Mirror Foil Backing Explained

All of our mirrors are supplied with a protective foil backing, which provides additional safety and durability.

• Helps protect the back of the mirror from moisture and damp
• Ideal for bathrooms, kitchens and humid environments
• Helps hold the mirror together in the unlikely event of breakage

This added layer of protection ensures your mirror is more durable and suitable for a wide range of environments.

Which Mirror Thickness Should You Choose?

• 4mm mirror: best for smaller, lighter applications or framed mirrors
• 6mm mirror: best for larger mirrors, wall installations and high-use areas

Understanding the different mirror thickness options will help you choose the right mirror for your space, ensuring both safety and a high quality finish.

Need Advice?

If you are unsure which mirror thickness is right for your project, please contact our team and we will be happy to help.

For additional interior inspiration, you can also explore guidance from the British Institute of Interior Design.