The contractor carried out the scheme at St Anthony's Primary in Armadale.
The project included two additional classrooms, a new gym hall, a general purpose room and support for a learning base.
An ongoing revamp of the school's external environment has involved building a new access road on the south side of the school, a new main entrance and reception area, additional playground space and developing new external teaching space from an area of overgrown landscape.
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A further six classrooms are scheduled to be built as part of the next phase of the development.
Scott Hadden from Hadden Construction said: "We're really pleased to have delivered such fantastic new facilities for St Anthony's in partnership with West Lothian Council and are sure that the pupils will enjoy the new school accommodation, especially the gym hall."
Councillor Lawrence Fitzpatrick added: "The additional space will help the school grow and ensure it can cater for the increasing demand as the town of Armadale continues to expand. The new gym hall and classrooms in particular are excellent, and will boost the learning environment for St Anthony's pupils."
(LM/JP)
