![](https://static.dezeen.com/uploads/2011/02/dzn_PAC-House-by-A-and-R-Architects-1.jpg)
PAC House by A+R Arquitectos
Portuguese firm A+R Arquitectos installed this staircase with floating wooden treads and a zig-zag hand rail as part of the renovation of a Portuguese house.
![PAC House by A and R Arquitectos PAC House by A and R Arquitectos](https://static.dezeen.com/uploads/2011/02/dzn_PAC-House-by-A-and-R-Architects-10.jpg)
Called PAC House, the three-storey project has parking and the entrance on the ground floor, kitchen, dining living room and bathroom on the first floor and bedrooms at the top of the staircase.
![PAC House by A and R Arquitectos PAC House by A and R Arquitectos](https://static.dezeen.com/uploads/2011/02/dzn_PAC-House-by-A-and-R-Architects-61.jpg)
Photographs are by Nelson Garrido unless otherwise stated.
![PAC House by A and R Arquitectos PAC House by A and R Arquitectos](https://static.dezeen.com/uploads/2011/02/dzn_PAC-House-by-A-and-R-Architects-12.jpg)
![PAC House by A and R Arquitectos PAC House by A and R Arquitectos](https://static.dezeen.com/uploads/2011/02/dzn_PAC-House-by-A-and-R-Architects-4.jpg)
More extensions and renovations on Dezeen »
![PAC House by A and R Arquitectos PAC House by A and R Arquitectos](https://static.dezeen.com/uploads/2011/02/dzn_PAC-House-by-A-and-R-Architects-2.jpg)
More residential architecture on Dezeen »
![PAC House by A and R Arquitectos PAC House by A and R Arquitectos](https://static.dezeen.com/uploads/2011/02/dzn_PAC-House-by-A-and-R-Architects-31.jpg)
More photography by Nelson Garrido »
![PAC House by A and R Arquitectos PAC House by A and R Arquitectos](https://static.dezeen.com/uploads/2011/02/dzn_PAC-House-by-A-and-R-Architects-8.jpg)
The following information is from the architects:
From the original building, localized in a context of a consolidated but chaotic city, we valued the stone masonry walls and the spatiality of the envelope.
![PAC House by A and R Arquitectos PAC House by A and R Arquitectos](https://static.dezeen.com/uploads/2011/02/dzn_PAC-House-by-A-and-R-Architects-9.jpg)
The new objects added inside suggest the clear reading of these limits which they tend not to touch.
![PAC House by A and R Arquitectos PAC House by A and R Arquitectos](https://static.dezeen.com/uploads/2011/02/dzn_PAC-House-by-A-and-R-Architects-14.jpg)
The intervention goals are twofold: to preserve the original character, through a careful balance between old and new; and to create living conditions compatible with contemporary habits.
![PAC House by A and R Arquitectos PAC House by A and R Arquitectos](https://static.dezeen.com/uploads/2011/02/dzn_PAC-House-by-A-and-R-Architects-15.jpg)
![PAC House by A and R Arquitectos PAC House by A and R Arquitectos](https://static.dezeen.com/uploads/2011/02/dzn_PAC-House-by-A-and-R-Architects-19.gif)
![PAC House by A and R Arquitectos PAC House by A and R Arquitectos](https://static.dezeen.com/uploads/2011/02/dzn_PAC-House-by-A-and-R-Architects-20.gif)
![PAC House by A and R Arquitectos PAC House by A and R Arquitectos](https://static.dezeen.com/uploads/2011/02/dzn_PAC-House-by-A-and-R-Architects-21.gif)
![PAC House by A and R Arquitectos PAC House by A and R Arquitectos](https://static.dezeen.com/uploads/2011/02/dzn_PAC-House-by-A-and-R-Architects-22.gif)
![PAC House by A and R Arquitectos PAC House by A and R Arquitectos](https://static.dezeen.com/uploads/2011/02/dzn_PAC-House-by-A-and-R-Architects-23.gif)
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See also:
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Heliotrope Raising by Bang Architectes |
51A Gloucester Crescent by John Glew | Vol House by Estudio BaBO |