The waste that you are able to put in your skip needs to be non-hazardous waste which includes building materials such as wood, tiles, unwanted household items and garden waste. Hazardous waste is not allowed to be disposed of in skips and could leave you with a hefty fine if you do so without a special permit. Hazardous waste includes anything that is harmful to the environment, so solvents, acids, corrosive materials, oils or anything that is flammable.