It depends where the door and fence are. If you need to walk onto the field beside you, then no it wouldn't be OK.
Not a silly question at all. When it is pouring rain, I do try to put my ammo bag somewhere dry. Sometimes it is possible, sometimes not.
Gotcha. My experience (so far) has been that the high house door is on the side of the fence as the field you are shooting. Not 100% sure though.