I found some old pictures of the “now” pantry when it was the original mudroom.  They’re a little blurry/grainy but you can get the idea.

You can see the linoleum flooring and under the shelf is where the washer and dryer were.

The room is about 8’x8′.  That door was the original back door before I did the addition.  That’s the same door that I used for “new” red pantry door.

Here is the “after”.  Finally got all the beadboard up and trimmed out.

Yep – that was the back door!