The term ONE WHOSE WORK IS ON THE HOUSE can be answered by the 6-letter word ROOFER. A ROOFER is a professional who specializes in the installation and repair of roofs. They are responsible for ensuring that roofs are properly sealed and waterproofed, and they may also be involved in the installation of skylights, chimneys, and other roof-related structures. Roofers must have a good understanding of building codes and safety regulations, and they must be able to work in all weather conditions.