A pumphouse would be easy to set up, and you could put it anywhere.
There may be advantages to having it under your cottage as it is now - it probably stays a little warmer in the cold (although you could actually put a 100W light bulb or something to "heat" the pump house during iffy months), and of course where it is now you can probably hear when the pump is running, so you know if there's a problem.
Ours is under the cottage (but only by a foot or so), so it's not too bad to work on. How far under your house if the pump? If it's way under there, I can see where this would be a pain.
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