Carol,
The switchable glass units are an attractive option but are so expensive that they end up being VE'd out of most projects.
The least expensive alternative is an interior-applied obscure film. 3M and others make them. Local applicators have samples. It is not a DIY job. Select one with adhesives that will be suitable for a high moisture environment.
More reliably permanent would be replacement glass within the unit: acid etched or sandblasted to a selected level of translucence. Most glass shops have access to these products.
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Philip Kabza AIA
Principal
SpecGuy Specifications Consultants
Mount Dora FL
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Original Message:
Sent: 04-30-2020 14:16
From: Carol Cioppa
Subject: One way glass for a residential bathroom
Hello! I have a good friend who wants me to help her renovate her bathroom. She has an existing fixed double paned window but wonder if a glass where she could see out but no one could see in would be possible. I remember seeing an interior glass partition system where you could change the visibility but have never seen anything for exterior use. Does anyone have any idea who makes such a thing?
Thanks very much for any ideas.