There is usually no sharp break between the interior of the building and the exterior of the garden/landscape.
The two tend to overlap in the area immediately around the building.
This is where the need for the extension of the building roof for overhead protection is required and to provide protection from climatic extremes.
The arbour can supplement the building extending it into the landscape, making it feel larger, easing and strengthening the connection.
The design should reflect the architectural character of the building and if possible, it should be considered with the initial construction so that it does not look added on as so many do today.
However, where this Is not possible and the arbour is added on long after the construction of the building, greater architectural importance is necessary.
It can be built as an independent structure but more often than not it then becomes a gazebo.
Arbours should be structurally sound, and they also should look sound.
The smallest post for any structure of this type would be 100 x 100, 100 x 150 is much better.
If metal posts are used, the size is still important.
Steel posts used for this purpose are usually square or rectangular tubes.
These posts will need to be set on a frost-free concrete footing.
The footing needs to rise above the soil line in order to keep the base of the post dry and so help slow rust.
Many times, it is better to build a column out of 25 x 250 boards to give both a good scale for outdoors and plenty of strength.
If this type of column is constructed then it must be capped or covered with copper or aluminium flashing to shed water and to stop birds from nesting inside the post.
The overlap of the architectural and landscape space is obvious and requires careful design treatment specific to the site and the needs of the users.