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A Pennsylvania lawsuit said Tesla was in breach of its contract after raising a Solar Roof price.
The suit, filed by Philip Dahlin and Mary Arndtsen, said it would seek federal class-action status.
The increase "was a significant disappointment," Dahlin told Insider.
More than half a year after Philip Dahlin and Mary Arndtsen signed a contract with Tesla to install a Solar Roof on their home in New Hope, Pennsylvania, the couple received a message from the company.
Tesla said their price would now be $78,352.66, up from the $46,084.80 price they'd agreed upon.
"Our budget was based on the contract that we had, so it was not something that we had prepared for," Dahlin told Insider this week via phone.