The key to understanding title insurance is understanding the title recording system in the US.
Oversimplifying, and recognizing that there are innumerable local variations, documents reflecting the ownership of real property and liens and other interests in real property (like mortgages) are recorded in the office of the county clerk (or similar official). The county clerk keeps a copy of the document on public record, and maintiains an index of all recorded documents by the property they relate to (usually by tax map number or similar code).
When a document is recorded, the whole world is considered to be on public notice of what it contains, and anyone who subsequently acquires an interest in the property takes their interest subject to previously recorded documents. That means, for instance, that if there is a lien recorded on your property and you try to sell it, the lienholder will be able to go after the subsequent owner who purchased it from you. Similarly, if there is a judgment recorded against you and you take out a mortgage on the property, the judgment creditor will be able to get paid before the mortgage-holder.
What this means is that before title insurance is issued, the title company sends someone down to the county clerk’s office and prepares a report on who is on record as owning the property and whether there are liens, judgments, mortgages or other encumbrances against the property. If you are listed as the owner and there are no encumbrances, you’re home free and title will be insured. If there are encumbrances, they will have to be dealt with. For instance, if there is a mortgage on the property, a new lender will usually want it to be paid off, usually from the proceeds of the sale or refinance. Other problems can be much more complex. However, once the problems are resolved to the satisfaction of the title company, if they ever come up again, the title company will defend against them.
Perhaps the most common title problem which title companies resolve without problem is the absence of a recorded mortgage satisfaction. Let’s say Owner 1 ownes a house with a mortgage from Lender 1, and sells it to Owner 2 and pays off the mortgage from the sale proceeds. In this case, the Lender is supposed to provide a formal satisfaction of mortgage document to be recorded after the payoff check is received and clears. However, it is quite common that these do not get recorded. If the satisfaction of Owner 1’s mortgage was never recored, when Owner 2 tries to sell to Owner 3 the record will show Owner 1’s mortgage as still active and encumbering the property. If Owner 2 did not get title insurance, there is a major headache in trying to track down Lender 1 (or the bank Lender 1 merged into from three mergers ago), determine that the loan was in fact paid off, and get a duplicate satisfaction to record. However, if Owner 2 had title insurance, Owner 3’s title insurer can just contact Owner 2’s title company, which was the one that handled the mortgage payoff of Lender 1 when Owner 2 bought the property, and get a coverage letter saying that Lender 1 was paid off.
There are, of course, many more types of title problems, some of them innocent and some involving fraud, that title insurance protects against. Some title insurance claim stories will make your hair stand on end (though most are rather mundane). In court yesterday, my opposing counsel was discussing a case he was involved with where a guy forged bunches of deeds and took out millions of dollars worth of fraudulent mortgages.
So, the reason that you need new title insurance each time you take out a new mortgage (which is what refinancing really is), is that there needs to be a new search at the clerk’s office of anything that was recoreded after your prior mortgage and to insure that your mortgage has priority over everything else there.
I do believe that in some states (including New York, I think), you may be able to get a discount from your title insurer if you refinance and use the same company within five years. That’s something you could inquire about.