Is it illegal to film the outside of someone's house?

Using filming footage for commercial purposes, such as in an advertisement or movie, typically requires consultation and permission from the owner.
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Generally, filming the exterior of private property from public property is legal as long as there is no infringement of privacy or misrepresentation of any kind. Always aim for complete compliance by researching local laws and regulations. A permit might be required for the area you're planning to shoot in.