Ever heard of our friend and savior, The Hole?

Leave a 10m gap between your build and dig a trench around your build. This simple trick offers protection against all kinds of raids except the dragons and the bats. Dragons won't raid you anymore after you deafeat the fourth boss, and bats won't raid you unless someone in your server killed some.

You can literally ignore ALL other raids and keep building while being invaded.

Coast bases can do exactly the same using Hoe and Stone, just build a natural wall.