To easily achieve maintenance and extension by viewing a wiring cable laid above the ceiling and determining a connection destination thereof, opening a ceiling access panel, and drawing the wiring cable.

A building with house wiring comprises: a plurality of breakers 2 connected to the commercial power supply 9; and a wiring cable 1 which has one end connected to the respective breakers 2 or ground 4 and the other end connected to an outlet 22 or electric appliance 20. A ceiling access opening 31 for inspecting the wiring cable 1 is bored in a ceiling 30 and closed with a detachable ceiling illumination fixture 21A. The wiring cable 1 includes a lighting cable 11, an outlet cable 12, an air-conditioner cable 13, a cooking cable 14, a refrigerator cable 15, and a ground cable 16, which are color cables having coatings colored differently. Further, the wiring cable 1 is fixed to the building while having a slack portion 5 drawn to be extended.