In this chapter, I discuss innovation and entrepreneurship in residential real estate and construction (i.e. housing). Based on R&D spending and patent statistics, housing does not appear to be a very innovative sector. But in the last two decades, there has been a significant increase in the amount of investment going to real estate technology companies. I discuss the companies * Prepared for the NBER Growth Conference "Beyond 140 Characters: The Role of Innovation and Entrepreneurship in Economic Growth". I thank the conference organizers Mike Andrews, Ronnie Chatterjie, Josh Lerner, and Scott Stern, my discussant Jessie Handbury, as well as participants at the "Beyond 140 Characters" workshop for their helpful comments. All errors are my own.