Can I install a door viewer in any door?

Yes, in general you can install a door peephole in almost any door, although there are some specific aspects to consider for certain types of doors.

• Wooden doors: With these doors, it is easiest to install a peephole. You simply need to drill a hole and insert the peephole.
• Glass doors: It is not recommended to install a peephole in glass doors, as drilling the necessary hole can damage the glass and even cause it to break.
• Metal doors: Installing a peephole in a metal door is somewhat more difficult than in a wooden door, but it can still usually be done by a professional. A suitable hole must be drilled with a special drill bit, and the peephole is then inserted.
• Fiberglass doors: Peepholes can also be installed in fiberglass doors; however, caution is required here, as the material can be easily damaged. It is recommended to have this work carried out by a professional.

Please make sure that, before you begin installation, you have the right tools and carefully read the instructions for your specific peephole.