Daylight is an important consideration in almost every architectural project. This title presents residential projects in which it is a fundamental feature of the design. The spotlight is on conservatories or winter gardens, built with glazed or obaque roofs depending on the climatic conditions. It was in the 19th century when winter gardens were first used as rooms where people met to converse and gossip, an extension of conventional living spaces. Along with architectural plans for individual examples, the ecological potential of these spaces is discussed here, for example through the construction of winter gardens as a form of building modernization. What is more, examples of the trend in residential design for structures resembling greenhouses are also presented, revealing how the idea of the winter garden has become a powerful influence on modern design.