A crack in mirror glass cannot be polished away, and cosmetic filler does not restore the strength of the glass. For an everyday bathroom mirror, the practical choice is usually replacement glass, a replacement cabinet door or a new mirror. Which route offers the best value depends on the frame, lighting and extent of the damage.
First, separate a crack from a scratch or backing damage
On a small screen, swipe the table to compare all columns.
| What you see | What it suggests | Best next step |
|---|---|---|
| A line through the glass, often branching towards an edge | Cracked glass | Photograph it without pressing on the damaged area; arrange assessment and safe replacement. |
| A shallow mark on the surface | A scratch rather than a crack | Ask a glazier to assess the finish before using abrasive products. |
| Dark patches or blackened edges behind the reflection | Reflective backing deterioration | Assess glass replacement; surface cleaning will not rebuild the backing. |
| An intact reflection but failed lighting | An electrical or lighting fault | Troubleshoot the light separately before replacing sound glass. |
Do not press a crack to see whether it moves. Keep people away from loose or spreading damage. For a large wall mirror or an illuminated unit, arrange removal with an installer; avoid lifting damaged glass off the wall yourself.
When replacement glass makes sense
A sound decorative frame may be worth keeping, especially if it is an important part of the room’s design. A glazier can assess whether suitable replacement glass can be fitted. A mirror cabinet may have a replaceable door assembly, which can preserve the storage unit behind it.
An LED mirror is more integrated. Its glass, illuminated areas, backing and demister need to work together. An ordinary sheet of mirror glass is not automatically a like-for-like replacement. Ask the original supplier about a compatible assembly before paying for a repair that will lose the lighting effect you enjoy.
What to do if your new mirror arrives damaged
For an LED Mirror World order, inspect the mirror before installation and contact help@ledmirrorworld.co.uk with your order number and photographs of the damage and packaging. We offer free replacement if your mirror arrives damaged. Keep the packaging while the issue is being resolved and do not install the damaged mirror.
Turn a necessary replacement into a bathroom upgrade
Start with the usable wall width and basin position, then choose what you want to improve: a brighter grooming area, a softer shape or a more generous reflection. Check the new mirror’s bracket and cable positions with the installer; a similar overall size does not guarantee the same fixing points.
80 × 60 cm gold rectangular frontlit mirror — £159. A warm frame and front illumination make this a strong choice when the replacement should be a visible style upgrade. Dimming and anti-fog add practical comfort.
50 × 80 cm long oval backlit mirror — £99. Choose soft curves and a rear glow for a calmer look. The image shows the range in a horizontal arrangement; the linked option selects the 50 × 80 cm size. Three light colours, dimming, memory and anti-fog make it adaptable to daily use.
100 × 60 cm front-and-back-lit mirror — £198. A broader rectangular reflection combines lighting towards the user with a glow around the wall. It is a useful step up when the old mirror felt too small above the vanity.
Prices and stock checked on 27 October 2026. Listed prices are before any checkout promotion.
You can also explore the oval backlit mirror with anti-fog or compare large bathroom mirrors for a wider basin arrangement.
Repair or replace: make the decision around the whole mirror
- Keep a frame worth saving when suitable replacement glass is available.
- Compare the complete repair cost with a new mirror, including removal and installation.
- Check lighting and demister condition separately from the glass.
- Choose the new shape and size around the vanity rather than simply covering old fixing holes.
If the glass is sound and only the light has failed, our LED mirror troubleshooting guide is the better starting point. Read whether LED mirror lights can be replaced for the component decision, or replacing a medicine cabinet mirror for a storage unit.
Cracked mirror questions
Will resin make a cracked bathroom mirror as good as new?
No. Filling a visible line does not restore the original glass strength or guarantee a clear reflection. Arrange a proper glass or mirror replacement.
Do I need to replace the whole cabinet?
Not necessarily. A compatible replacement door may be possible when the cabinet itself is sound. Start with the cabinet supplier and the exact door design.
Find a replacement you will enjoy using in our LED bathroom mirror range.
Enjoy free UK delivery, a 3-year warranty and free replacement if your mirror arrives damaged. Choose the size and style that makes getting ready feel better every day.