The most common use of a mezzanine floor is for storage. This normally means utilizing either a combination of short and long-span shelving below and above the floor. Many businesses will use one level for one purpose e.g. storage and the 2nd level for an office. Office mezzanines can be built in the warehouse and factory environment and using composite or steel partitions with glazing can create the right work environment. All welfare facilities such as canteens and toilets can be part of the self-contained offices. Mezzanines are often used in retail to increase the selling space and or the storage back of the store. When mezzanine floors are used in retail there are stringent regulations as in the floor has to be fire rated, the stairs are for public access and the handrail is suitable for public use.