On hillside houses the deck is tall on the downhill side, so the design starts with footings on sloping ground, posts sized for the height, and bracing. Access for materials is often limited to a narrow side yard or a flight of steps, which affects both schedule and cost.
Townhome decks are small, so details carry more weight: a clean fascia, a rail that does not block the view, and boards that need little upkeep. Where the association allows it, capped composite and aluminum rail are the usual choices, and the frame and attachment are checked before any new surface goes on.