Located 15 minutes from Edinburgh, the venue has been closed for the past 18 months.
A new lift, dressing rooms and cloakroom area have been fitted and the kitchen has been extended to enable catering for large-scale functions.
The venue’s 500-capacity main hall has seen the addition of new AV technology, improved acoustics, a sprung hard wood dance floor and retractable.
First opened by the Queen Mother in 1971, The Brunton was built with funds bequeathed to the community in 1951. The main hall was the only space in the building which had not been refurbished since it was built.
Lesley Smith, general manager of The Brunton, said: "This is fantastic facility and its transformation is long overdue. With state of the art equipment and flexibility, and our ideal coastal location near the Scottish capital, we are confident that we will be able to rival many venues in the centre of Edinburgh."
The refurbishment of the main hall was funded by East Lothian Council.
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