Grannie flats, man-caves, back-yard studios — call them what you will, tiny, fully-serviced homes on the same property as a larger house have been around for a long time. But laneway suites — which not only sit in the backyard of a house, but also front on to an accessible laneway — are a different breed. And according to a new study, they could be a crucial tool in dealing with Toronto’s rental housing shortage.