The crew flees the city and moves into a new house in the Hamptons for six straight weeks together. While Lindsay is trying to take her relationship with boyfriend Stephen to the next level, Paige is taking her time to decide if Perry is the one for her. The housemates, especially Hannah, are baffled to learn that Luke is bringing a new girl to the house this summer. Only time will tell if Luke’s plan to juggle two girls under one roof is a good one.
Carl kicks off the first weekend and hosts a reception for his mom’s virtual wedding. Danielle throws a roller-skating party, but Lindsay is too bothered by Stephen’s hectic work schedule to enjoy herself. Afterward, the housemates get to work to throw Kyle an unforgettable birthday, which devolves into chaos when Hannah and Ciara’s budding friendship threatens Luke’s chances with either girl.
While the cold war between Luke and Hannah shows no signs of warming, Lindsay wonders if she is actually the priority in her relationship with Stephen; the housemates plan a family dinner to get back on track, but it leaves the house divided.
The crew decides to let loose in an all-out mullet extravaganza, the debauchery continues; much to the chagrin of Paige and Amanda, Hannah and Luke reconcile; the real war begins when Kyle calls a house meeting.
Luke thinks a flirtatious flower delivery will get his relationship with Ciara back on track, only to find himself deeper in the friendzone. Stephen attempts to cheer Lindsay up with a romantic birthday dinner that completely backfires. Meanwhile, Hannah and Amanda’s friendship takes a turn for the worse. Carl receives devastating news, and heads home to be with his family.
Always looking for an opportunity to send it, Kyle is enraged to find his housemates have more laid back plans for their Saturday night than he’d prefer. The teacher becomes the student when Lindsay finally receives a grand gesture from Stephen. Carl returns from Pittsburgh to find the house in shambles after Hannah and Kyle’s most explosive fight yet.
Kyle tries to make amends with Hannah for Amanda’s sake, only to find that Hannah isn’t as quick to forgive and forget. Lindsay grapples with ending her relationship with Stephen for good. Finally, rumors spread like wildfire when Hannah receives an explosive tip from her psychic about Lindsay and Luke, sending the house into a tailspin.
It’s a house divided for Girls’ and Guys’ Night. Lindsay and Luke’s maybe-not-so-innocent friendship is called into question when Amanda and Paige confront them about the juicy hookup rumor. But the party must go on as the housemates organize a bar crawl through their rooms, where sparks fly between Ciara and Carl, who slips up and puts his sobriety at risk. Finally, all hell breaks loose when the guys corner Luke and demand he account for his behavior.
A fun house pub crawl devolves into a serious conflict between the boys, causing Luke to leave the house, possibly for good. Lindsay's pregnancy test result has her wondering if she made a mistake when she broke up with Stephen. Finally, Kyle surprises Amanda for their two-year engagement anniversary, and little does Lindsay know, Stephen has his own surprise...
With Stravy’s return, the house is abuzz about Lindsay’s chaotic relationship. Meanwhile, Hannah and Danielle dial up their phone relationships to the next level with in-person visits from their love interests. Luke is blindsided by information about Hannah and Des before the summer. And while everyone parties on a boat to kick off the weekend, Paige starts questioning the direction of her relationship with Perry.
Lindsay decides it's time to take her relationship to the next level and make her ring size known; Carl throws a Derby-themed party, complete with a housemates horse race; Hannah finds herself in the hot seat.
It's the final days at the house and to commemorate the end of summer, the housemates throw a wedding-themed party for Kyle and Amanda; Hannah, Paige and Ciara navigate their complicated friendships; Lindsay and Stravy continue their relationship.
In the dramatic conclusion of the Summer House reunion, Carl discusses his struggles with sobriety. Luke accuses Hannah of turning the house against him, while Paige is caught in the middle of Hannah and Amanda’s fractured friendship. Finally, tension comes to a head when Hannah is confronted about what she and her new fiancé Des did in Kyle and Amanda’s bathroom, leading to shocking admissions and shaking the house to its core.