All page totals given are for the US paperback edition.

After expanding the series to four volumes, Martin remarked, "What can I say? It's a BIG story, and a cast of thousands."[23]

After A Storm of Swords was completed in 2000, Martin began writing A Dance with Dragons, the intended fourth volume which would pick up the story five years after the previous volume. Martin found it difficult to make this work without an over-reliance on flashbacks. At the World Science Fiction Convention in Philadelphia on 1 September 2001, Martin announced that he was scrapping more than a year's work and writing a different fourth book that would fill in the gap, named A Feast for Crows. He found it extremely difficult to go back and start again, especially as this novel was not planned for in his scheme for the series, and work on the book progressed slowly.

By May 2005, A Feast for Crows had become longer than A Storm of Swords (the manuscript for which had been 1521 pages) and Martin's publishers said they could not publish the book in one volume.[16] They suggested splitting the book in two and releasing the volumes as A Feast for Crows, Volume I and A Feast for Crows, Volume II, but Martin was unhappy with this idea. After discussing the matter with his publishers and his friend and fellow writer Daniel Abraham, Martin decided to split the book by character and location instead. The published A Feast for Crows thus contained all of the characters in the South of the Seven Kingdoms, while the forthcoming A Dance with Dragons will contain the characters in the North, the Free Cities and in Slaver's Bay.

In a May 2005 statement, the author also said that this move now meant that the series would require seven volumes. Martin recognized that this decision could cause frustration among some of his fans. He wrote: "I know some of you may be disappointed, especially when you buy A Feast for Crows and discover that your favorite character does not appear, but given the realities I think this was the best solution... and the more I look at it, the more convinced I am that these two parallel novels, when taken together, will actually tell the story better than one big book."[16]

These problems aside, A Feast for Crows was released in October 2005 and immediately won largely positive reviews. Time dubbed Martin "the American Tolkien",[24] and the novel went straight to the top of the New York Times bestseller list.

Despite initial hopes of A Dance with Dragons being published quickly after A Feast for Crows, the writing and revision process for this fifth novel proved more difficult than anticipated. On January 1, 2008, Martin published an update on his website saying he hoped to have the book published in the autumn of 2008, but that it was only a hope.[25] After almost 6 years it was announced [26] that A Dance with Dragons will be released July 12, 2011. The book length will be similar to A Storm of Swords. During the long writing period, Martin insisted that he would not be bullied and works at his own pace, on this and several other projects, to make sure they come out as good as he can possibly make them.[27]