I'm trying to understand the Building Pattern and I have trouble with the Director

I try to code a builder pattern for my better understanding. Mostly I relied on GOF and wikipedia. So my Object is a house with required attribute area and some optional attributes (like windows, doors, rooms etc.) I will show you the code. Now, I'm not really sure if its correct and I think I don't have a director? I don't get in which cases you need one and how it works.

This is my class house and the innerclass HouseBuilder

public class House {

//required
private final String area;

//optional
private int windows;
private int doors;
private int rooms;



//constructor with HouseBuilder
private House(HouseBuilder builder) {
    this.windows = builder.windows;
    this.doors = builder.doors;
    this.rooms = builder.rooms;


   }



public static class HouseBuilder {

    //required
    private String area;

    //optional
    private int windows;
    private int doors;
    private int rooms;

    //constructor with required attributes
    HouseBuilder(String area) {
        this.area = area;
    }
            //optional attributes
    public HouseBuilder windows(int windows) {
        this.windows = windows;
        return this;
    }

    public HouseBuilder doors (int doors) {
        this.doors = doors;
        return this;
    }
       //function for building
        public Housebuild() {
              return new House(this);

 }

}

Now, I just got a class demo where I can build a house like that:

House house = new House.HouseBuilder("Downtown") .doors(3).windows(2).build();

But this is not a director like in the books. Is my idea even correct? And why is that better than just using setters?

Thanks!