How does one go about adding their name (with permission from boyfriend) to the house title without refinancing?

You can't add your name to the deed and/or mortgage. To change from sole ownership to joint ownership is expensive.

You can ask him to write a will leaving the house to you if he dies.. :)

Please go back to the home page and click on the Real Estate Law forum. At the top of the forum is a sticky on how to add a name to a deed.

Contrary to the answer you received from Choux, it is not necessarily expensive.