The size of the annex will vary by tent. But the annex goes out 1’ at the bottom of each side theannex to make them bigger.Shasta EV- 8’ out by 70” wideShasta SF- 5’ out by 70” wideRainier EV- 8’ out by 8’ wideRainier SF- 5’ out by 8’ wideDenali EV- 8’ out by 111” wideDenali SF- 5’ out by 111” wide