Re: How long is a survey good for?
Plaster, if a survey was any good in the first place, the surveyor competent and honest, it was good for about ten minutes. As soon as the surveyor walks away, that's that. In eighteen months someone can hit a rock, break the rigging, let the bilges fill up with water and start rotting out the boat. The chainplates can leak, the engine can be overheated and blown, the rudder shaft can be bent. Rats can eat the sails while a tree falls on the lifelines and bends the stanchions.
How long is a survey good for? How long is a piece of string?
And it isn't just your ten grand at risk. If you start to do a little work here and there, wind up putting in another grand or two, contract for a year at a marina, then find out there's a major problem and you're going to have to pay to have the boat hauled away because they are treated as hazmat at regular landfills...You could easily wind up putting $15k plus at risk here.
If you don't know boats, and can't get help from someone who does, a survey is worth considering. If you will be insuring the boat then your insurer may also require a survey from a specific list of surveyors they have approved. If you've had a survey done but they require someone else, you wind up buying two surveys.