Dual-key units are something of a niche property. On the one hand, having a subunit opens up many different possibilities. On the other hand, some might complain that it restricts interior design possibilities and uses more space for utilities. This week, we spoke to architect RJ, who showed us how he maximised the square footage of his dual-key unit: Choosing a Dual-Key Unit at Haus on Handy For RJ, the decision to go with a dual-key unit at Haus on Handy wasn’t part of his original plan, even though it turned out to be the perfect fit. Originally, RJ says he was considering a BTO studio flat, or converting his old bedroom into a “live-work” space. But he found himself drawn to the dual-key layout at Haus On Handy, as a “serendipitous family investment opportunity” that checked all the boxes. “I already had in mind a modestly sized space I could fit out into a living-and-work artist studio cum  ...