Children are facing lessons in a cramped corridor office because there is no classroom available at their school.
When three- and four-year-olds arrive at Guard House Primary School in Keighley in September, their classroom will be a 12ft by 12ft room once used by the special-needs co-ordinator.
Since November the youngsters have been using a reception-year classroom, which next term will be needed for a bigger Year One intake.
Their old nursery - on the school's former first school site across the playing fields - is condemned. Since its closure it has been the target for vandals.
Education chiefs at City Hall claim it needs £73,000 spending on it to repair the leaking roof and replace windows.
Now angry parents are demanding that Bradford Council's education department find the funds to provide a new nursery building on the new site, or repair the former nursery.
Elizabeth Heath, of Highfield Road, Keighley, whose son George attends the nursery, said: "Tony Blair said nursery school provision would be a priority - we want to see his words in action here.''
Head-teacher Sandra Firm said: "We should be moving forward, not taking a backward step."
Nobody at Bradford Council was available to comment on the subject.
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