Critical reception
The Lady in the Van received positive reviews, with particular praise being aimed at Smith's acting. Rotten Tomatoes gave the film a rating of 89%, based on 149 reviews, with an average rating of 7.21/10. The site's consensus states, "Led by a marvelous performance from Maggie Smith, Lady in the Van wrings poignant, often hilarious insight from its fact-based source material." On Metacritic the film holds a score of 70 out of 100, based on 30 critics, indicating "generally favourable reviews".
Guy Lodge, of Variety magazine, attended the worldwide premiere at the Toronto International Film Festival. After the screening, he described Smith's portrayal of Mary Shepherd as "one of the most tailor-made leading roles of her late career". Even though, he says, the film is "low on narrative drive" and "marred by a misjudged final act", "Hytner's amiable [love] fest" is "enlivened by Smith’s signature irascibility; silver-dollar auds should turn up, if not in droves, at least in healthy vanloads". Frank Scheck, of The Hollywood Reporter, also attended the premiere, and like Lodge, he felt Smith's character was the "driving force" behind the film. Not to his surprise, Smith "fully exploits the humour in her character's bizarreness". For example, when her character "receives guidance from the Virgin Mary; her utter obliviousness to her lack of personal hygiene; her hatred of the sound of music that sends her fleeing whenever she hears a note; and her ragtag wardrobe which has been assembled from various dumpsters". In spite of the humour, Scheck praised Smith for "subtly convey[ing] the emotional pain and desperation of [an] addled old woman, especially in the scenes [where she is] taken away by social services and gently treated to a thorough washing, feeding and medical examination".
Ian Nathan, of Empire magazine, awarded the film four out of five stars. Like many, he applauded Smith's "liberating" role, describing her as "shrill and hilarious, but not a joke". He also commended the directing, saying: "Unshowy to a fault, Hytner delivers a fine, moving comedy of English manners between a writer and his eccentric tenant, which slowly deepens into an exploration of human bonds". In a similar fashion, Peter Bradshaw, of The Guardian, awarded four out of five stars and called it an "enjoyable film from Nicholas Hytner". While he felt Smith's performance – "honed from previous stage and radio" adaptations – was "terrifically good", he praised Jennings for giving a "sharp and sympathetic performance as Bennett".
Donald Clarke, of The Irish Times, awarded the film three out of five stars. He said Smith's role is "indecently appropriate", while de la Tour's is "fabulous", and Allam's is "equally as good" as the latter's. The "problem" with the film is "that, like Miss Shepherd’s van, the story rarely" moves on. It remains "gracelessly the same throughout", with "narrative details" being "plucked like unattached footnotes". When the characters do "open up", during a "bafflingly appalling final scene", you "rather wish the doors had remained shut". Also awarding three out of five stars, Stella Papamichael, of the Radio Times, had similar feelings. She said: Smith and Jennings' characters "veer close to a moment of pathos towards the end [of the film], but [it's not] too profound. The social awkwardness [leaves] a more lingering impression" on the audience.
Jesse Hassenger, of The A.V. Club was critical, stating The Lady in the Van is flawed because the film is "supposed to be revealing Bennett, not Shepherd"; a fact that many "will be reminded of before the film’s end". Smith's character is very commanding on screen, while Jennings "honorably tend[s] to his character’s quiet, semi-closeted homosexuality". No "matter how many meaningful considerations of mortality" are thrown his way; through the screenplay, Jennings "doesn't have a chance" against Smith. On the contrary, Slant Magazine's Elise Nakhnikian said the film is all about the "fastidious, somewhat timid, and reclusive playwright Alan Bennett", and stated the film's "annoying glibness is neatly summarized" by the line: "In life, going downhill is an uphill job".