Many lenders today require interior photographs of homes as part of the condition of obtaining a mortgage.  If you have a rental property one should be aware that the consent must come from the tenant.

To make the consent meaningful the purpose of the pictures and how that information will be used must be disclosed.

The pictures are viewed as collection of personal data.

Here are a few lines from a 2006 decision from the Privacy Commissioner's Office:

The Assistant Commissioner noted that Principle 4.3.2 stresses the link between knowledge and consent and underscores the importance of the individual's reasonable expectations.  In other words, if an individual is being asked to consent to a collection of his or her personal information, he or she would reasonably expect to be informed of the reason for the collection.  The Assistant Commissioner also believed that the individual would reasonably expect to be informed of the means of this collection.

It is highly recommended that one should get written consent for the interior photographs.  A signed copy would then be placed in your files for future reference.