Underside Of Upper Kitchen Cabinets . See more at design mom. Upper cabinets that follow the standard cabinet. rustic traditional Archives Village Home Stores Blog from www.kitchenremodelingquadcities.com In most cases, the sink and oven cabinets are the same size, because the cabinet maker has standard sizes to. Therefore, to keep the paintwork uniform, paint the outside of the cabinet as well as the underside. Should the underside of white painted semi custom upper cabinets be fi.