The new energy-efficient facility has been built by Hadden Construction.
The old nursery building has been demolished to make way for the improvements. Further work will now get underway including a new nursery playground and pedestrian access way to the school.
Speaking after opening the facility, Cllr David Dodds said: "We're delighted with the new £1 million nursery at Mid Calder Primary. The standard of work on the project has been fantastic and the new facility will provide a great setting for pupils ensuring they get the best possible start to their education.
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"This all comes as part of West Lothian's commitment to having one of the best school estates in the country, with £65 million spent on education infrastructure improvements since 2012 and further £40 million planned over the next two years to deliver the ideal educational environment."
Mid Calder Head Teacher Mary McKenzie added: "The new facility is free - flowing giving the pupils greater access to choosing whether they want to be indoors or outdoors which is already making a positive difference to the children's learning."
(LM)
