By a few inches, what do you mean?

You can move your house by talking to Nook in the upgraded resident services building and asking to relocate. This won't be cheap; it'll cost 30,000 bells

For that, I don't think it's worth the few inches that you mean, but if you're desperate, the option is there

No.

If you want to relocate a house to a location that overlaps with its current location, you will have to first move it somewhere else, then move it back.