Do you need Owners Corporation approval for internal installation of secondary glazing

This question requires consideration of several factors to be able to determine the correct answer. The first point to consider is if you are installing the second window in your own property (inside your lot boundary). I would assume you are, so there are only a couple of other small factors to consider. As you say, the external appearance of the lot will remain unchanged after the installation. This is good, as if it was to change, then you would need to seek the Owners Corporations consent prior to proceeding.

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