Throughout its run, this show had several scenes on the Bunkers' fairly large front porch. In fact, you could see part of it every time the front door was opened. However, in the opening credits, the front of the house was shown, and there was no porch, just a small set of steps.
I don't care though; this is probably my all-time favorite TV show.
In the original pilot, Archie Bunker wears a plaid shirt instead of the standard white later on. It could be that there was a different house set when the show began but Norman Lear changed his mind.