Open porches and hoods are preferable to and easier to assimilate than enclosed porches. A pitched-roof porch should project from the building by at least the width of its span – though obviously this could prove a cumbersome element on a small elevation. 

Gabled and flat-topped hoods are alternative possibilities, but lean-to and flat-topped enclosed porches detract from the form of the house and are undesirable. A lean-to enclosed porch with side entry may be acceptable on a longer, asymmetrical facade.