DIY businesses supply products and materials for household repairs, maintenance, decoration and improvement projects. Their stock commonly includes hand and power tools, fixings, adhesives, sealants, paint, brushes, wallpaper, flooring, timber, plumbing and electrical fittings, garden supplies and safety equipment. Larger retailers may also sell kitchens, bathrooms, storage systems and building materials, while smaller shops may focus on particular trades or types of project. Customers can typically expect help identifying suitable products, measuring or matching materials, and understanding basic installation or use. Some businesses offer services such as paint mixing, timber cutting, key cutting, tool hire, delivery or kitchen and bathroom planning. The range of advice and services varies, and DIY retailers generally sell supplies rather than carry out building work themselves. For work involving regulated trades, customers may need to engage a qualified contractor separately.