CUT Architectures adds a second concrete-framed extension to a French home
Paris studio CUT Architectures has returned to the house it extended in 2011 to create a glazed study featuring a yellow staircase that integrates a desk (+ slideshow).
![Chaville house extension part II by CUT Architectures](https://static.dezeen.com/uploads/2015/05/Chaville-house-extension-part-II-CUT-Architectures_dezeen_468_24.jpg)
CUT Architectures founders Benjamin Clarens and Yann Martin added the 16-square-metre extension to one side a 1920s house in the Parisian suburb of Chaville.
Following their previous extension to the property, which provided a music room and a garage, this second addition forms a new entrance, stairwell and study. They named the project House Extension for a Cellist Part II.
![Chaville house extension part II by CUT Architectures](https://static.dezeen.com/uploads/2015/05/Chaville-house-extension-part-II-CUT-Architectures_dezeen_468_1.jpg)
Like the first extension, the new structure is squeezed between the walls of the existing house and a neighbouring property.
![Chaville house extension part II by CUT Architectures](https://static.dezeen.com/uploads/2015/05/Chaville-house-extension-part-II-CUT-Architectures_dezeen_468_2.jpg)
"The construction is a concrete volume inserted between the western facade of the existing house and the neighbour's house, offering an entrance and a desk to the whole house," explained Clarens and Martin.
![Chaville house extension part II by CUT Architectures](https://static.dezeen.com/uploads/2015/05/Chaville-house-extension-part-II-CUT-Architectures_dezeen_468_4.jpg)
The base of the extension is clad in sheets of aluminium mesh and aligned with the facade of the existing house, while the glazed upper storey is surrounded by a concrete frame and set back in line with the facade of the neighbouring building.
![Chaville house extension part II by CUT Architectures](https://static.dezeen.com/uploads/2015/05/Chaville-house-extension-part-II-CUT-Architectures_dezeen_468_12.jpg)
"A concrete frame echoes the previous project and the painted frames of the windows of the existing house above the expanded aluminium panels," added the architects.
![Chaville house extension part II by CUT Architectures](https://static.dezeen.com/uploads/2015/05/Chaville-house-extension-part-II-CUT-Architectures_dezeen_468_15.jpg)
The anodised aluminium panels, which match the garage shutters, conceal the glazed entrance.
![Chaville house extension part II by CUT Architectures](https://static.dezeen.com/uploads/2015/05/Chaville-house-extension-part-II-CUT-Architectures_dezeen_468_20.jpg)
Inside, a floating staircase with bright yellow treads and a banister leads to a study that overlooks the green roof of the lower storey.
A steel sheet intersects the lacquered banister to provide a desk set against the glazing.
![Chaville house extension part II by CUT Architectures](https://static.dezeen.com/uploads/2015/05/Chaville-house-extension-part-II-CUT-Architectures_dezeen_468_8.jpg)
"The desk as well as the staircase is conceived as a continuous yellow lacquered steel structure suspended above the concrete slab and staircase," said the architects.
![Chaville house extension part II by CUT Architectures](https://static.dezeen.com/uploads/2015/05/Chaville-house-extension-part-II-CUT-Architectures_dezeen_468_17.jpg)
Photography is by David Foessel.
![Chaville house extension part II by CUT Architectures](https://static.dezeen.com/uploads/2015/05/Chaville-house-extension-part-II-CUT-Architectures_dezeen_0.gif)
![Chaville house extension part II by CUT Architectures](https://static.dezeen.com/uploads/2015/05/Chaville-house-extension-part-II-CUT-Architectures_dezeen_1.gif)
![Chaville house extension part II by CUT Architectures](https://static.dezeen.com/uploads/2015/05/Chaville-house-extension-part-II-CUT-Architectures_dezeen_section_1.gif)