Robin Wade, 63, wanted to replace his traditional Aga with a newer one. He claimed the company told him he would have to demolish the plinth in his kitchen, a process that costs around £350.
Instead, he bought an older Aga, refurbished by an independent company, which fitted onto the plinth in his Kent home.
“To install a new Aga, we would have to break up our concrete plinth and re-lay the floor under it,” he said. “This would risk damage to the kitchen units on either side.
“It would have been incredibly inconvenient and expensive.”
Mr Wade claimed that Aga was deterring homeowners from buying the newer models.
“We now joke with friends that this will be a case study for business classes of the future in how not to run a business,” he said.
Buying agent Jess Simpson said some homeowners were redesigning their entire kitchens to replace old-fashioned Agas.