died after 1942 and either (1) the works were never published, or (2) they were published after 1922 and properly renewed. If the works meet these criteria, and you are the heir to the copyright owner’s estate (and can prove it), you can register copyright in your name and stop others from copying the works.
Copyright for architectural works. Architectural drawings were not classified as protectable works until December, 1990. Prior to that, courts tended to protect architectural blueprints. The extent of protection may depend on how distinctive or elaborate the plans are, but it's likely the works you describe will meet the standards for protection.
Privacy. We don't believe that publication of architectural drawings would give rise to a successful invasion of privacy claim because the publication doesn’t disclose personal facts, or intrude into personal affairs. Even if we are correct, however, a wealthy homeowner could always still mount a tort claim. You may lower the chances of such a suit by not mentioning the names of the persons presently living at the home.