These decks are all raised, for a specific purpose or to suit site conditions such as slopes.
In actual fact, every deck I build is a raised deck. The reason is that the deck planking has to be fixed to a support frame and this is usually, at least 90mm (4″) deep. Also, it is best practice to keep this frame clear of the soil. However, in his section, I have shown examples of decking projects which are significantly raised for whatever reason. Usually, this is because part of the site is steeply sloping, but in some cases it is to bring the deck up to a height where it is level with an existing door sill.
It should be noted that as of 1st October 2008, decks may need planning permission if they are more than 300mm above the ground. I always find this a bit contentious because in many situations, it would be impossible to adhere to without having dips and hollows in the deck, which follow the contours of the ground on which it is built. Does the 300mm rule apply to the highest peak or the lowest dip? In which case, what if the site is sloping?
As ever, it is the homeowners responsibility to check with the local authority. It is also wise to consult with neighbours, especially if a raised deck is likely to infringe on their privacy.