The £121m project was delivered by the Defence Infrastructure Organisation (DIO).
It was built by the 'Hercules' JV at the former RAG Lyneham airbase.
The new facility is part of a £230m investment in the site by the MOD to provide new accommodation for trainees.
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Other features include new classrooms, training suites, a large outdoor training area, a medical and dental centre, a gymnasium, an Officers' Mess and a new regimental museum.
Roger Frost, Balfour Beatty Project Director for Hercules, said: "We are delighted to have worked on such a high profile major project for DIO.
"The scale of the 93-week construction project, which spans a 1,200 acre site and has employed over 1400 individuals at construction peak and 40 local companies during its lifetime, should not be underestimated – it reflects Balfour Beatty and Kier's reputation for safely delivering high-quality, sustainable solutions."
(LM)
