Adding a face to a closed shape - again!

(Attached the skp)
I drew all the walls for a floor in my house, mainly the line tool, deleting any faces that showed up. Now that I’m done, I want to push/pull the walls to height. The “inside of the walls” are all connected, so if I could flood the area and make a face, I think I could pull it to height. Can’t figure it out.
Can you help?14109NoDoors.skp (36.6 KB)

I see two problem areas.

zooming in close on the two areas @Shep pointed out, there are gaps.

So simple. Thank you!

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