When? Where? You have to be a little more specific.
Simon helps Ralph build shelters in Chapter 3 of "Lord of the Flies."
it was Simon.
simon
Simon is the only boy helping Ralph build the shelters in William Golding's "Lord of the Flies."
Simon suggests that Ralph should hold another meeting to tell the little-uns (little boys) Pg.51
Ralph and Simon were attempting to build a third shelter on the beach. Ralph was standing outside it placing branches and leaves onto it, while Simon was inside trying to arrange the branches.
Everybody helped with the construction of the first hut. But then the enthusiasm died down and it was only Ralph and Simon that would build the shelters. Simon also wandered off for long periods of time in the forest. Piggy never helped because he had asthma, which the boys called "ass-mar". The littluns just played and swam all day. Jack and his Hunters were too busy hunting or watching the signal fire.
Early in the novel Ralph, Jack and Simon climb the mountain to ascertain if they are actually on an island. Later in the book Ralph, Jack and Roger climb the mountain in search of the beast.
3the first one they all build the second one a group of themthen the third one only Simon & Ralph
Ralph built a shelter with Simon's help in "Lord of the Flies." They used palm fronds and other materials to construct the shelter on the island. They worked together to create a place where they could seek refuge and feel safe from the elements.
Ralph rarely tells anyone to do anything, that just isn't his style of leadership. Ralph is the leader but he rules by agreement and concensus. The issue of shelters had been raised and discussed at some of the meetings, where all the boys had agreed to work at building shelters.
In chapter 8 of "Lord of the Flies," the boys who stay with Ralph are Simon, Piggy, and Samneric. They choose to remain loyal to Ralph and help him maintain order on the island.