In 2006, Dr. Kate Forster is leaving a lake house that she has been renting in Kenosha, Wisconsin to move to Chicago. Kate leaves a note in the mailbox for the next tenant to forward her mail, adding that the paint-embedded pawprints on the path leading to the house were already there when she arrived. Two years earlier in 2004, Alex Wyler, an architect, arrives at the lake house and finds Kate's letter in the mailbox. The house is neglected, with no sign of paw prints anywhere. During the subsequent restoration of the house, a dog runs through Alex's paint and leaves fresh paw prints right where Kate said they would be. Baffled, Alex writes back, asking how Kate knew about the paw prints since the house was unoccupied until he arrived. On Valentine's Day 2006, Kate witnesses a traffic accident near Daley Plaza and tries to save the male victim, unsuccessfully. She impulsively drives back to the lake house, finds Alex's letter and writes back. Both Alex and Kate continue passing messages to each other via the mailbox, and each watches its flag go up and down as the message leaves and the reply arrives as they wait at the mailbox. They cautiously look around each time the flag changes, hoping to somehow spot the other. It is in vain as they are alone at the mailbox. They then discover that they are living exactly two years apart. Their correspondence takes them through several events, including Alex finding a book, Jane Austen'sPersuasion, at a railway station where Kate said she would have lost it, and Alex taking Kate on a walking tour of his favorite places in Chicago via an annotated map that he leaves in the mailbox. Alex eventually meets Kate at her boyfriend's party but he doesn't mention their exchange of letters to her because she did not "know" him at that time. She later remembered the meeting as a vague memory in the past. For Alex, the meeting happened in the present but for Kate, it had already taken place in the past without her knowing that it was Alex. As Alex and Kate continue to write each other, they decide to try to meet again. Alex makes a reservation at the Il Mare restaurant for March 2006 – two years into Alex's future, but only a day away for Kate. Kate goes to the restaurant but Alex fails to show. Heartbroken, Kate asks Alex not to write her again, recounting the accident a year before. Both Alex and Kate leave the lake house, continuing on with their separate lives. On Valentine's Day 2006 for Alex, Valentine's Day 2008 for Kate, he returns to the lake house after something about the day triggers a memory. Meanwhile, Kate goes to an architect to review the renovation plans for a house she wants to buy. A drawing of the lake house on the conference room wall catches her attention and upon asking, Henry Wyler informs her the artist was his brother, Alex, and Kate realizes that this was the same Alex with whom she had been corresponding. She also learns that Alex was killed in a traffic accident exactly two years ago to the day and realizes why he never showed up for their date – he was the man who died in Daley Plaza. Rushing to the lake house, Kate frantically writes a letter telling Alex she loves him, but begs him not to try to find her if he loves her back. Wait two years, she says, and come to the lake house instead. Meanwhile, Alex has gone to Daley Plaza to look for Kate. At the lake house, Kate drops to her knees sobbing, fearing that she has arrived too late to stop Alex. After a long pause, the mailbox flag finally lowers; Alex has picked up her note. Not long afterwards, a familiar mint-green truck pulls up. She walks forward smiling as the driver, clad in jeans and a familiar tan jacket, approaches. She and Alex kiss and walk toward the lake house.
The film is set and filmed in the Chicago area. The lake house itself was built on what is called Maple Lake, located within the Maple Lake Forest Preserve off of 95th Street in the southwest suburbs of Chicago. The house was actually built on dry land and then flooded to appear that it was in the lake. After filming, the house was required to be removed, and a simple fishing dock was put in its place. The downtown scenes are in The Loop. The scenes where Kate and Morgan go to Henry's office, and Kate's dramatic exit down the stairs, were filmed at the Chicago Architecture Foundation. The scene where Henry and Alex talk on the street after being in their father's office was filmed on the 400 block of South Michigan Ave, in front of the Fine Arts Building and the Auditorium Theater. The scene where Alex and Simon converse in Simon's home was filmed at the Prairie Avenue Bookshop, an architectural bookstore in Chicago which closed in 2009. Other filming locations include Aurora, Illinois and Riverside, Illinois, a small town on the outskirts of Chicago that is known for its historic houses, and several Frank Lloyd Wright buildings. The railway station in the movie is the real station of Riverside, and the bridge that Alex crosses while chasing Jack is called the "Swinging Bridge"; it crosses the Des Plaines River. The scene where Kate gets stood-up is in Millennium Park at the Park Grill. The bar scene in the Loop where Kate is seen sitting on the barstool, speaking with the woman at the wooden bar, is the real "Millers Pub" located at 134 S Wabash Ave, Chicago, IL 60603.
The film trailer also features the song "Somewhere Only We Know" by the band Keane. It is available on the albumHopes and Fears.
Reception
Box office
In its opening weekend, the film grossed a total of $13.6 million, ranking fourth in the United States box office. As of October 1, 2006, the movie has grossed $52,330,111 domestically, and $114,830,111 worldwide.
Critical response
On review aggregator website Rotten Tomatoes, the film holds an approval rating of 35% based on 156 reviews, with a weighted average score of 5.01/10. The site's critical consensus states: "The plot of The Lake House is a little too convoluted, and the film fails to pull off the sweeping romance it aims for." On Metacritic the film has a weighted average score of 52 out of 100, based on 34 critics, indicating "mixed or average reviews". Roger Ebert, gave the film its most positive review and ranked it 3.5 stars out of 4, noting that "It succeeds despite being based on two paradoxes: time travel, and the ability of two people to have conversations that are, under the terms established by the film, impossible...What I respond to in the movie is its fundamental romantic impulse." Ebert praised Bullock and Reeves in their respective roles, calling both "enormously likeable". While pointing out the movie's logical inconsistencies, Ebert wrote, "Never mind, I tell you, never mind!" Writing for USA Today, Claudia Puig described The Lake House as "one of the more befuddling movies of recent years. The premise makes no sense, no matter how you turn it around in your head."
Home media
The Lake House was released on DVD, Blu-ray Disc and HD DVD on September 26, 2006 by Warner Home Video. It was the first film to be simultaneously released on all three formats on the same day, and Warner became the first studio to issue a title in this manner. The single-disc DVD was initially available for region 1 territories only, in both widescreen and full-screen editions with 480i resolution. Special features included were additional deleted scenes, outtakes, and the film's theatrical trailer. A region 2 compatible version was later released on October 9. The Blu-ray was also a single-disc release but with 1080i resolution and not region locked.