Wood, plaster, drywall, roofing, flooring, cabinets, fixtures, furniture, and general cleanout material are all fine to load. The limits come from Delaware's disposal rules and from what the landfill will take.
Delaware treats yard waste as its own stream. Since January 2008, yard waste cannot arrive mixed with household garbage, and each state landfill keeps a separate area for it. If your job produces both brush and building debris, tell us up front so they stay apart.
Hazardous waste, liquids, paint, solvents, fuel, and asbestos never belong in a standard container. The Delaware Solid Waste Authority handles those through its own collection events, and its list includes aerosol cans, drain and oven cleaners, mercury thermometers, smoke detectors, corrosives, stains, strippers, thinners, and paints other than latex. Ammunition, fireworks, gunpowder, and small compressed-gas cylinders are on that list too.
Batteries, used oil and oil filters, and electronics all have their own state programs rather than going into a mixed load.
If something has you guessing, check it with your account manager before it goes in the container.