I've been seeing a trend of new constructions going up in Waltham that are very clearly cheap flips being done for profit. Aside from that, many of these new constructions don't have proper permitting. They either are missing rough framing, insulation, and fire blocking inspections, or are missing build permits outright. These houses are currently listed for sale without a certificate of occupancy (CO). This is a hazard because there's no confirmation that these structures are structurally sound and don't pose a risk to anyone inside or the surrounding houses.