2010 CBC1122B.5 Sales and service counters,... portion of the counter ... at least 36 inches in length with a maximum height of 34 inches AFF
1110B.1.3 Check stands. ... minimum clear checkout aisle width of 36 inches with a maximum adjoining counter height not exceeding 38 inches AFF
above the finish floor. The top of the counter lip shall not exceed 40 inches above the finish floor.
2013 CBC
11B-904.4 Sales and Service Counters. Sales counters and service counters shall comply with 11B-904.4.1 or 11B-904.4.2. The accessible portion of the counter top shall extend the same depth as the sales or service counter top.
EXCEPTION: In alterations, when the provision of a counter complying with 11B-904.4 would result in a reduction of the number of existing counters at work stations or a reduction of the number of existing mail boxes, the counter shall be permitted to have a portion which is 24 inches (610 mm) long minimum complying with 11B-904.4.1 provided that the required clear floor or ground space is centered on the accessible length of the counter.
11B-904.4.1 Parallel Approach. A portion of the counter surface that is 36 inches (915 914 mm) long minimum and 36 34 inches (915 864 mm) high maximum above the finish floor shall be provided. A clear floor or ground space complying with 11B-305 shall be positioned for a parallel approach adjacent to the 36 inch (915 914 mm) minimum length of counter.
EXCEPTION: Where the provided counter surface is less than 36 inches (915 914 mm) long, the entire counter surface shall be 36 34 inches (915 864 mm) high maximum above the finish floor.
11B-904.4.2 Forward Approach. A portion of the counter surface that is 30 36 inches (760 914 mm) long minimum and 36 34 inches (915 864 mm) high maximum shall be provided. Knee and toe space complying with 11B-306 shall be provided under the counter. A clear floor or ground space complying with 11B-305 shall be positioned for a forward approach to the counter.
11B-904.3 Check-Out Aisles. Check-out aisles shall comply with 11B-904.3.
11B-904.3.1 Aisle. Aisles shall comply with 11B-403.
11B-904.3.2 Counter. The counter surface height shall be 38 inches (965 mm) maximum above the finish floor or ground. The top of the counter edge protection shall be 2 inches (51 mm) maximum above the top of the counter surface on the aisle side of the check-out counter.