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The change in construction materials underlies the greater demand for new construction. Alan Stein, co-founder of Denton, MD-based acknowledges that his firm, like Baird’s, works more in the way of new design. “Traditional Skylights and roof lanterns were very different from the ones that are being built today, because the technology is different,” he says. “In New York City, for example, the Skylights or roof lanterns were usually made out of sheet metal, bent into little structural shapes and then cut to size and soldered together. They weren’t structural steel or wood, and they weren’t built in the way that we build them today.” About 70 percent of Skylights and roof lanterns from Tanglewood Conservatories are made in wood, mainly mahogany, while the remainder are manufactured in cast iron, steel and aluminum.