They need a lift!

Public housing tenants in one Upper West Side building have been trapped in their apartments thanks to an elevator that broke two weeks ago a NYCHA contractor has yet to fix.

Residents said Friday the outage has gone on for 13 days at 154 W. 84th Street, forcing residents to use the stairs — and forcing the elderly and disabled to cancel plans.

“It’s been a nightmare,” said wheelchair-bound tenant Richard Welch, 54, who lives on the third floor. “This is not how housing should treat its tenants.”

He said the breakdown forced him to miss a dental surgery that he scheduled weeks ago.

“I wanted to go outside and enjoy the weather but I can’t. I’ve been watching the television, reading books,” he added. “But it gets boring.”

The busted elevator trapped elderly resident Fiona, 77, in her third-floor apartment for nearly two weeks.

“Today was my first time outside in 12 days,” she said in Spanish, with a neighbor translating. “I haven’t been out since (the elevator broke).”

Another third-floor resident, Nancy Tirado, 61, said her asthma made climbing the flights of stairs to get in and out a burden.

“They’ve been saying they’re fixing it since yesterday, but I don’t believe them,” she said. “My asthma kicks in, and I have to go up and down the steps — it’s not fun at all.”

“It seems like a low floor,” she said, referencing her apartment, “but it’s a killer.”

NYCHA records show that 83 people call the seven-story building’s 35 apartments home.

“It’s really messed up what they do to the tenants here,” said Tiffany Lopez, 36, whose mother is the president of the development. “There’s always an issue with the elevator here. People get stuck in it all the time. Especially in the summer.”

The building — also known as the Dome Site — is owned by the city’s embattled Housing Authority, but is maintained and managed by a private company.

“We are working with our management partner at 154 W. 84th Street to restore elevator service as quickly as possible,” said NYCHA spokesman Chester Soria, who said the authority is offering to relocate tenants to nearby developments while the elevator remains broken.

The Post previously highlighted the building in a story about questionable sky-high inspection scores as part of an expose on NYCHA living conditions.

The embattled Housing Authority owns 173,000 apartments in 316 projects located across the city — and faces a $32 billion repair bill to bring them all back to good condition.