What type of plan shows a house location on a site with details like garages and gardens?

The correct choice for identifying a plan that shows a house's location on a site, including features like garages and gardens, is a plot plan. A plot plan is specifically designed to illustrate the arrangement of a building on its lot, indicating the boundaries of the property, landscaping, and the placement of other structures like garages and gardens relative to the main house.

A foundation plan focuses on the base structure of the building, detailing the layout of foundations and support systems, without consideration for external elements such as landscaping or the overall site layout. A floor plan illustrates the interior layout of a building, showing the arrangement of rooms and spaces but does not include external site features. An elevation plan provides a view of the exterior of a building from one side, displaying how it appears from a particular perspective, without addressing its location on a plot or the surrounding elements.

Thus, the plot plan is the most fitting answer as it encompasses the comprehensive view of both the house and its immediate environment.