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Number One Portsmouth

Hot on the heels for plans to renovate Zurich House, one of Portsmouth's tallest buildings, and outline proposals for a new 100 metre tall hotel next to it, another property developer is planning a scheme almost literally over the road.

Called Number One Portsmouth, the proposals are being developed as a major four star hotel by Robert Gamlen Homes on site that is bounded by Surrey Street to the east and Station Street to the south.

Designed by PLC Architects, the 26 storey building features a stepped profile when viewed from the east and west, with a spire above it. It will be 81 metres to roof making it the second tallest building in the city, and 102 metres to the tip of the spire.

Located in the lower half of the spire will be a vertical-axis wind turbine which looks similar to a DNA helix to help contribute towards the environmental efficiency of the building. Other green features however are less obvious such as passively cooled ceiling beams to help regulate the interior temperatures.

The project is clad largely in double-skinned glass curtain walls with single glazing as the outer layer and an inner layer of double glazing. The facade system has a series of small vents integrated into it that will allow the natural circulation of air between the layers of glass - something that can help to passively cool or heat the building by intaking air from the bottom. Hot air rises, which means the building can then vent it through louvres concealed in the façade overruns at the top of the walls.

Around the building, the ground area will be remodeled with a drop-off point and an al-fresco area for a café. Also included in this is a structure with a curving canopy that will be clad in coloured aluminium glazing that takes on an aquamarine look.

At night the building is aimed firmly towards the landmark stakes with a series of different lighting plans being considered which could include hundreds of illuminated dots marking the grid of the facade and red lighting for the wind turbine and spire which should help give it an animated appeareance.

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Number One Portsmouth

Number One Portsmouth
Zurich House

Zurich House
Number One Portsmouth
Number One Portsmouth