Whether the glass in your internal door is broken by overenthusiastic slamming, cracked with age or simply needs refreshing, a good glazier, carpenter or joiner will be able to quickly remove the old glass and replace it with new. If you need a design, style or colour matching then your tradesman should be able to source something for you. If not, then they should be able to replace all the glass with something that you will be happy with and which works on your internal doors. In some cases they may even be able to source vintage or salvaged glass to closely match glass on an antique or period door.
A skilled tradesman will be able to make repairs to glass where there is a minor crack, although they will also be willing to advise you whether to do so is inadvisable or dangerous. The cost of the job will depend largely on the replacement glass that needs to be installed, but a simple replacement of standard glass on an internal door should not take more than an hour or so and will be a relatively inexpensive job.
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