Madrid. The area is considered a conventional residential zone, of no specific architectural
interest, built using heterogeneous topologies and materials. The housing development, called
Rio Cofio, is located on the outskirts of the village Robledo de Chavela; there at the edge of a
cliff, a 1,400 m2 steeply sloped lot overlooks a small river. The property is accessed by a road
that runs right above it. Directly in front, facing west over the valley, the mountain rises again,
creating a natural park that is especially protected. When we first saw this lot, we felt it essential
to be able to reach this area with the house; to be able to hang in the middle of the valley,
suspended at the top of a tree, almost at the other side, listening the murmur of Cofio River
directly below. From here, we had to resolve a technical, functional and, mainly, economical
problem. The need to work practically without any resources led us to sharpen our wits and to
administer the work ourselves, subcontracting all of the professionals one-by-one. None of them
(all local trade professionals), nor any of us, had run into such a structural problem as this one
when building a house before. How could we build this there without financial backing and
achieve a unique space for the two people that were to live there? We began to think: an iron
structure like those of the visionary Russian Constructivists, a work by Tony Carr, a chair by
Shapiro, a piece by Max Hill; something heavy and light at the same time; gravity, an issue; the
scale, an instrument to work with; a large table or a small ship. In the end, we were searching for
a linear house with a rise to it. The straight line and an interior staircase with 90 cm. deep steps
as in a garden, reuniting all functions. Below it, a small therapeutic pool, 2 m. wide by 10 m. long.
The entire design is developed inside a metal, “cubic like” structure (parallelepiped) clad with a
skin stretched sheet metal (deployé), resting on a reinforced concrete base – the container for
the pool water and for the gas, heater, water treatment tanks, etc. The guts of this iron artifact,
where all vital fluids are concentrated. All of this, more than 15 meters above the river. Nine HEB
300 carry the load the ground. These columns are the only contact the house has with the
ground. To maintain structural equilibrium and a certain gravitational logic, the house is
suspended 5.5 m. over the river without any support, and the same amount is projected towards
the road, where there it ends up being only 40 cm. above ground at the entrance. By doing this,
a balance in weight is achieved; apart from placing the heavy elements over the cement frame,
thus lowering the center of gravity.
The crane that was available only reached 18 m., that is only as far as the concrete box. We were
not going to be able to construct the cantilever that projected out towards the river. The solution
consisted in erecting the entire metal cage and then sliding it into position over rails using manual
winches, as if it were a train.
In short, this house in which Paz and her husband Tomas presently live was an adventure and we
are grateful to them for their trust and courage. It is a home with which, according to them, they
Castellano, interior architect and work coordinator, had projected and constructed this dwelling.
Casa Paz. Río Cofio Housing Development, Robledo de Chavela, Madrid.
C/ DEL RIO, 591. URB. RIO COFIO. ROBLEDO DE CHAVELA. 28294 MADRID.
Preparation of the project and completion of construction schedule:
January 2004_April 2006.
Arturo Franco. (architect)
Fabrice van Teslaar. (architect)
Diego Castellanos (interior architect)
Site Supervisor and Quantity Surveyor:
Paz Fernandez/Tomas Rodríguez
Cost per Square Meter: 280,000 euros.
Area or volume constructed: 363 m²