Emirates Spinnaker Tower two large, white, sweeping metal arcs, which give the tower its spinnaker sail design. The steelwork was fabricated by Butterley Engineering. At the top is a triple observation deck, providing a 360° view of the city of Portsmouth, the Langstone and Portsmouth harbours, and a viewing distance of . The highest of the three observation platforms, the Sky Deck, has only a wire mesh roof, so visitors are open to the elements. The windows extend above head height, so it is not possible to get a view unobstructed by glass. A glass floor is located on the first viewing deck
Emirates Spinnaker Tower Barry Smith, the project's legal advisor, also retired after being suspended on full pay, mostly because of controversy over the contract with the builders, which at one point would have cost the council more to cancel than to complete. The tower has suffered from a number of issues since opening, including a malfunctioning external glass lift. During the final construction phase a protester from the rights group Fathers 4 Justice scaled the tower wearing a high-visibility jacket and unfurling a banner in the process. Another incident happened a year later when a base jumper managed to get past site security