The team of S2 pupils scooped the title in the Built Environment Challenge after a series of challenges including building a garden shed and taking part in a property development exercise.
The team walked away with a trophy and gift vouchers plus a cheque for 300 for their school, following the event held at the Corn Exchange, Edinburgh.
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Hide AdStephen Sheridan, of ConstructionSkills said: "Congratulations to Merchiston Castle. They have performed consistently well throughout the heats leading up to this final and also on the day itself."