Major Renovations: From updating an older home to remodeling a kitchen/bathroom there's a permit (possibly more) required to do such renovations regardless if it's a small or big renovation.
Structural Changes: Meaning changes to the home like building/taking down a wall. Or just simply any demolition that will be required. This is an especially important permit to apply for because it needs to be reviewed to be concluded whether or not taking that wall down, for instance, will be safe for the rest of the home. In other words, some (de)construction might make your house unsafe to live in.
Electrical, Plumbing, and Mechanical Works: All three of these areas require additional permits along with the general building permit. If your project includes installing/adding, replacing, or removing anything, a permit will be imperative. This also depends on the area that you live because in some locations it's required, and in others, they may not so make sure you know whether or not a permit is needed.
Other general permits that are a necessity:
New Construction: Regardless if you're building a home or a gazebo, a permit is required when doing any new construction. Also, if you're planning on building lets say, a fence, a special permit might also be required.
Additions: If you're planning to extend your home, like adding new rooms or even a porch/patio/deck, you need a permit for that.
Even with all this info, it's still highly recommended to check your city to see what permits are needed because like I stated earlier, different areas may or may not need permits.
Til Next Time,