Dude, if a player goes through the trouble of singlehandedly building a house for his wife... placing every brick, driving every nail, laying every plank of the wood floor, all while always thinking about his wife and planning everything just the way she would like it.... yeah, that's got to count, and it's going to have a hell of a threshold, vamps or no vamps. Probably even greater if they did it all together.
But hiring a company to build a house for your true love? Different story.
Now, if I'm a player of a wcv and this perfect house happens to show up, you know as an NPC house where significant portions of a PCs time have been spent doing this.... well, thats a molotov cocktail waiting to happen.