Prajha Group of Company is a Chennai based firm that specializes in Engineering Procurement Contacting, construction : Infrastructure & Building and Building Maintenance , Exports and Imports of capital goods and crafted building products, Empowering Challenged, academy for skill developments and having Prajha Trust for social responsibilities.Building Design - Renovation Share your expertise in the building business. The term 'renovation' refers to the process of repairing something. Renovation is the process to improve or upgrading an old, damaged, or malfunctioning building in the construction business. This is in contrast to' retrofitting,' which involves adding a component or feature that was not originally included, or' refurbishment,' which involves cleaning, decorating, or re-equipping something.