## Null Is a House. It’s Also a Challenge to Every Oversized Home Ever Built. Most architects build big to be taken seriously. Hafsa Burt builds small for the same reason. Her latest project, the Null House, designed through her San Francisco studio hb+a Architects, arrives as both a prototype and a thought experiment — a deliberate reckoning with what shelter actually needs to be. Burt, a LEED Fellow and AIA architect who has spent decades pioneering low-carbon, health-focused design, isn’t interested in excess. Null is the built proof of that conviction. The structure is assembled from…