It is to be the kind of work that is marked by faithfulness and dependability. When we are more faithful to our jobs than we are to God's House we are building on wood, hay, and stubble. Gold, silver, and precious stones is the kind of work that is puts God first and is faithful to the area's in which we serve. I think of the city of London. You will not find a wooden building in the city.
Every building is made of stone, concrete, brick, or some kind of non-perishable material.
The reason is due to the great fire in 1666. Most of the city built, largely of wood, was destroyed. The city was rebuilt with brick and stone to prevent such a disaster from ever happening again. We are to build with non-perishable materials. We are to give God a work of quality.