The floor space should be 1sqft per bird for meat birds(broilers) and 2sqft per bird for layers. The wall should be 1.75m high on the long sides with 1.20m being sold wall and the remaining 0.55m chicken mesh. The highest point of the roof should be 2.75m (gabble roofing). Remember the house should be on east-west orientation and must be rectangle. Avoid square because there is always a dead spot at the central part of the square that will not be utilized by birds due to whirlwind that tend to occupy that part.