You can get a boat to place in your house, it's called Fishing Vessel and is available for purchase upon obtaining the Master Fisher achievement.
But I assume you mean a boat that you could actually sail, would be cool but with the current "zone tech" I don't see it very likely. If one day the unify this "One Tamriel" into truly one world similar to how a game like Black Desert Online is built, then we could talk about boats to sail from zone to zone as I see it.
The only boat you can currently get is gated behind a combination of PvE and PvP, you need to get the Master Fisher achievement as Majeure pointed out. It's decorative only but this is one thing I *really* hate about MMO's - IMO PvE and PvP should be totally seperate and there should be no achievements that force you to do both.
lunawisp was my Peacebringer in City of Heroes - a game sadly consigned to history. She lives on in memory as my gaming id.
We will never get storage for housing because it would be available to everyone and ZOS can't have that. Everything they have done so far is starve the playerbase for inventory space, then unlock more space exclusively for subscribers.