What type of contractor needs this training and which firms need to be certified? As of April 22, 2010: Any contractor who does renovation, repair or painting for compensation in pre-1978 housing or in pre-1978 elementary schools, day cares, pre-schools and any other facility where a child under 6 spends 60 hours per year, if the work will disturb 6 sq. ft. of painted surface in any room or 20 sq. ft. of exterior paint, or does any window replacement or any demolition must comply.