“This building had no roof,” says Norman Crowley as he shows me around the former carriage house and stables of Powerscourt House in Enniskerry, Co Wicklow. The maze of historic buildings, some of which previously housed the CoolPlanet Experience educational centre that moved online during the pandemic, is nearing the end of its completion into 20,000 square feet of new office and workshop space for Crowley’s CoolPlanet Group. After a Covid-19-induced slump, the business has been on a hiring spree and will hit 170 employees at the end of this month, Crowley says. Most of them will work here. He…