The earlier in the planning process that the designer is involved the better, in order that proper harmony can be created between the interior of the house, its surroundings and the wider landscape.
When a house and garden are being remodelled at the same time and architects are involved with the building project it is helpful to include the garden's design from the earliest possible stage so that all plans consider the needs for practicalities such as access, services and drainage of both the house and garden.