Is it difficult to connect in to an existing sewer line?

From the article: "Adding the water and sewer connection only cost another $5,000. "

Building an ADU (aka Granny flat) can cost hundreds of thousands and take a long time to get done.

So it's a way cheaper and easier option.

Not difficult if you’re comfortable being handy. PVC is easy, it’s just a sewer clean out or a dump station for extra fanciness. If your sewer line is something other than PVC, you might need a professional involved. Hand trench, and you might need a private locator service to find it if you don’t know where the existing sewer line is.

“home rv sewer dump” are the keywords to use for additional research and sources.