This reply will assume that by "pipe" you mean something like a 6 inch
steel casing.


The pipe does not have to be pulled to pull the pump out. The pump comes
right up through the casing (six inch pipe, typically).

You do have to leave access from the top. IF your pump was installed using
galvanized pipe, it is likely in 20 feet sections. Those sections would all
have to be pulled out of the well, one at a time. That alone would require
20 feet of headroom. This is usually done by a small crane/lift/winch,
built into the truck that the pump company would use.

If you have pvc pipe going down to the pump, you still have to have room for
the truck/machinery to be positioned in place over the top of the casing.
So, a small well house is fine, but you need to be able to complely remove
the top.


--James--