Unknown Architects adds combined staircase and sofa to 200-year-old house

Dutch firm Unknown Architects has modernised a small seventeenth-century house by adding a large wooden structure that incorporates a staircase, storage facilities and sofa (+ slideshow).

Unknown Architects renovate house with combined staircase and sofa

Unknown Architects was careful to restore some of the 200-year-old building’s character and spatial simplicity by removing the non-original partitioned walls and suspended ceilings.

Unknown Architects renovate house with combined staircase and sofa

Located in the Dutch city of Leiden, the house’s ceilings were purposefully left uncovered to contrast with the more modern plastered walls and bamboo furniture in the rest of the property.

Unknown Architects renovate house with combined staircase and sofa

Working with a limited space, the architects designed a bamboo staircase that merges into a fixed sofa with integrated storage space, similar to the design of a ship’s cabin.

Unknown Architects renovate house with combined staircase and sofa

The sofa also acts as a pull-out guest bed, providing views of the garden through floor-to-ceiling glass doors at the back of the building.

Unknown Architects renovate house with combined staircase and sofa

Keeping to their client’s preference that the kitchen was the hub of the home, Unknown Architects combined it with the living space to take over the entire ground floor.

Unknown Architects renovate house with combined staircase and sofa

The kitchen table, work surfaces and storage space are all made of bleached nutwood, which acts as a natural accompaniment to the white, compact kitchen units.

The first floor has a master bedroom overlooking the property’s garden through floor-to-ceiling windows, and a children’s room intersected by a bathroom.

Unknown Architects renovate house with combined staircase and sofa

Unknown Architects was founded in 2012 by students Daan Vulkers and Keimpke Zigterman. They are currently involved in a number of projects in both Leiden and Amsterdam, where they are based.

Photography is by Raoul Kramer.

Here’s a project description from the architects:


Unknown architects completed the renovation of a 17th century house in the historic city centre of Leiden

Unknown architects is established by two students, studying at the Technical University in Delft. During their studies they became curious about working with clients. As a part of the honours programme they started this project, where they tried to translate the ambitions and wishes of a client in a design proposal. This cooperation turned out so well that this client decided to commission unknown architects for their first project, which was completed in November 2012.

Unknown Architects renovate house with combined staircase and sofa

All the non-authentic parts of this monument, like partition walls and suspended ceilings, were removed to bring back the authentic character and spatial clarity. In this relatively small house three fixed multifunctional furniture elements were added.

The ground floor functions as office and second bedroom. One bamboo furniture element incorporates storage space and a platform, covering a guest bed which can be pulled out.

An important wish of the client was to make the kitchen ”the heart of the house” where all activities could come together. This was translated in two kitchen elements, made out of bleached nutwood. The central element includes a table, kitchen dresser and a fixed bench that shields the stairwell and provides the best sightlines to the outside.

Unknown Architects renovate house with combined staircase and sofa
Cross section

On the second floor we added one small dresser made of bamboo shielding the stairwell and providing a place to sit under the dormer.

The walls are finished with white clay plaster. The uncovered ceilings are intentionally kept as we found them and form a contrast with the new.

Client: DoorZigt B.V.
Location: Leiden, The Netherlands
Program: renovation of house and office
Gross floor area: 75 m2
Project architects: Daan Vulkers, Keimpke Zigterman
Interior design: unknown architects
Contractor: Bouwbedrijf Degewij
Interior fit-out: Klaas Olthoff Keukenmakerij, Intopmaat

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