According to Census 2011, there are 26.8 million PwDs in the country. The number would be much more today. CAG has identified government buildings in 15 zones, including Delhi, Mumbai, Chennai and Kolkata, and the audit will check for not just basic requirements such as ramps but also finer aspects, including placement and height of handrails in lifts, gradient of ramps, Braille displays, tactile strips and audio messages in lifts.