Builder pattern - best understanding

Suitable environment.
1.Creation of complex object and don’t want to know how it is assembled (need encapsulation of creation process)
2.For same object ,it have more than one construction representation.

E.g
House buyer(Client),Construction company(Director),worker

Why suitable for construction pattern?

1.Client tell construction company wants 2 windows house or Jeff House which have two window.—>2.For same object ,it have more than one construction representation.
2.Client don’t want to know how it is built.—–>1.encapsulation

PS.
GOF explain this pattern very well.