The Eco-Niwas Samhita was launched in 2018 to set energy efficiency standards for residential buildings. The building code uses a parameter called Residential Envelope Transmittance Value (RETV) to define thermal performance of the building envelope (excluding roof) for cooling dominated climates. This paper presents evaluation of RETV of sample residential projects located in composite and warm-humid climate regions, after studying both individual and multi storey apartments.