The school at Bonhill will be a single storey building. Also included in the package is road works, car parking and landscaping.
At Clydebank work will include the demolition of the existing school and the construction of a new two storey building as well as road works, car parking and landscaping.
The job, worth £11 million, is expected to take 15 months and interested parties have until 15 December to submit bids.
Up to seven teams will be shortlisted for the project.