This Handbook is to support smallholder dairy farmers or entrepreneurs with good practice cow house design and business planning. However due to the technical nature of the Handbook, this will be mostly indirect through dairy consultants, architects, building contractors, dairy cooperatives, training institutions and other stakeholders. It provides the reader with a set of 6 modular cow barn designs, ranging from 3-18 mature cows plus young stock, based on the basic principles of good cow house design in a Kenyan context. This implies optimum cow comfort, hygiene and health, labour efficiency, flexibility & scalability (modular). Environmentally sound, simple and cost efficient.