I think Lipscomb would be moved off of 3B before House.
I should frame that better. I just think if Lipscomb is playing well, then I want him playing every day. Brady House is only 20. Let him develop instead of getting up fast. It isn't like the Nats are wasting MLB ABs on a Nelson Cruz or César Hernández.
If Brady House starts knocking the cover off the ball, they'll move people around to get him on the field. I just see no reason to rush in the interim.