A bungling council which built a school “too small” may have to pay millions to fix the mistake.

Dargavel Primary School in Bishopton, Renfrewshire, Scotland, was made for 430 pupils but revised projections show it will need to hold 1,100 children.

Council chiefs have apologised for the “error” and now preparing to bring in portacabins next year to hold pupils at a cost £2 million.

Parents had apparently warned the new school, which opened in January, would not be big enough.

Architect Professor Alan Dunlop said the extension for a school to accommodate an additional 670 pupils could cost around £17million.

He added: “I’m bewildered how an ‘error’ can be made in the construction of a school.

“Design and construction of a school, or any building, including working through developing a brief and the various processes required and making and securing the necessary planning approval and building consent and warrants does not happen over night.”

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