“Granny Flats” Could Remake the Housing Market. Why Are They So Contentious?

By Laura Mallonee

There’s also the question of property values. Opponents claim ADUs lower them. Proponents say they raise them. Chris Black, owner of Blackline Renovations, in Dallas, agrees with the latter assessment, explaining that, from his own experience, the square foot value of an ADU is about half that of the house, “and that’s on the modest side.”