I store mine in a 12 x 30 garage with a 10 foot high door might be 11.
Boat garage door height.
As a rule of thumb you should have at least a foot of clearance for safe movement and storage when you back the trailer and boat back in to the garage.
Get a bigger garage.
Most ocean boats say bay boats or pontoons have real issues with garage doors since they are typically tall.
Garage door height is a key limiting factor for most boats excluding bass boats.
Best garage door height for pontoon boat.
Bass boats are generally very low profile and only power poles if applicable fishing seats and huge outboard motors ever come close to not clearly.
But do not have to put the tower down and have plenty of room to walk around and even store stuff behind the boat.
To cover all possible boats that you can tow without a permit than a garage of about 14 7 feet high would cover all the bases.