More than £270m is going to be spent on repairing council homes in York - an average of about £33,000 per property.
The money will be spent over the next 30 years on fixing things like wiring, kitchens and bathrooms.
Councillor Michael Pavlovic said the sum for the planned works is a “very scary figure” at a housing meeting, but a council spokesman said the repairs are part of a “normal process”.
About one in every 10 council properties were deemed to be "not at a decent standard" earlier in the summer, according to a report prepared for the meeting.
But Mike Gilsenen, the council’s head of building services, said the majority failed because 546 homes did not have electric certificates from the past 30 years – so the council does not know what condition the wiring is in.
A programme to check the electrics in these homes will begin next month.