The 137 NEKO bioclimatic home, designed by the architecture studio elii, is located in the municipality of Valdetorres de Jarama, on the outskirts of Madrid. This house is conceived as a place for domestic and ecological enjoyment, so the main objective of the project and its execution was to treat and develop it from an ecological perspective.

The project is based on bioclimatic principles to employ passive and active strategies to generate maximum thermal comfort. The use of renewable energy, the installation of insulation, water reuse, and the use of heat recovery systems are some of the strategies employed in the home to make it an efficient home.

The proposal proposed by elii is located on the corner of a plot that consolidates the street of a new residential development, respecting the urban right-of-way spaces established by regulations. The home is organized around two design strategies: on the one hand, a modular system that allows the floor plan to be divided into domestic and teleworking spaces; and on the other, the sectional configuration as superimposed bodies that establish two different ways of communicating with the environment.

Its construction employs materials that pursue CO₂ neutrality, carefully meticulously processing the materials for extraction, production, distribution, and installation, and using local materials, such as wood and cork collected from nearby forests.

This home was designed for inhabitants who are conscious of their environmental impact, who are mindful of their environmental behaviour, while benefiting from energy efficiency strategies that allow for energy savings.

137 NEKO by elii. Photograph by ImagenSubliminal.

137 NEKO by elii. Photograph by ImagenSubliminal.

Project description by elii

Located on the edge of town in Valdetorres de Jarama, Neko is conceived of as a place of domestic and ecological enjoyment and the start of a new life. Its design is rooted in a low environmental impact strategy, mindful of the ecological performativity of its construction process.

Its corner placement on this 754m2 lot opens the dwelling up to the lot and consolidates its relationship with the street, leaving a strip of front yards as a succession of intimate spaces accessible from each room.

137 NEKO by elii. Photograph by ImagenSubliminal.
137 NEKO by elii. Photograph by ImagenSubliminal.

The design is organised around two main strategies. On one hand, in plan view, the project is laid out in modules, following a flexible functional arrangement that can accommodate both domestic spaces and remote work. On the other hand, in section view, it is configured from two overlaying bodies that offer different ways of engaging with the surroundings and the environment. The lower strip addresses needs for basic natural lighting, views, entryways, and ventilation.

Through a system of openings and solid-surface panels, this strip provides a direct relationship with the indoor and outdoor spaces to interact with the inhabitants’ bodies. The upper strip focuses on capturing light from above, generating energy, and supporting a green roof.

137 NEKO by elii. Photograph by ImagenSubliminal.
137 NEKO by elii. Photograph by ImagenSubliminal.

The general idea is for it to develop in phases. This first phase provides a basic architectural configuration that will gradually be adapted by its inhabitants. The second phase will entail completing the installation of solar panels, the chimney, and starting to plant greenery and small home vegetable gardens. The third phase is for enlarging the home with new models, thereby completing the central courtyard. The modular organization, the scale of the spaces, and the projected connections between modules can all be used to change the functional logic and act as a support for future enlargements and typological refits.

Based on bio-climatic principles, this project deploys different active and passive ecological strategies. A generous layer of insulation forms an effective enclosure. The openings are arranged for cross ventilation and drawing in or letting off heat from sunlight in winter and summer, respectively. The radiant floor heating and cooling system and the heat recovery unit work together to minimise operational energy use. Renewable energy significantly cuts down on dependence on fossil fuels. Water consumption is reduced by channelling overflow irrigation water from the green roof to the yard. Landscaping efforts will open up actions to replenish the soil.

137 NEKO by elii. Photograph by ImagenSubliminal.
137 NEKO by elii. Photograph by ImagenSubliminal.

The material strategy aims to minimise CO2 emissions into the atmosphere by means of a careful selection of materials mindful of the ecological footprint from their extraction, production, construction and use and the end of the building’s useful life. Wherever possible, biomaterials are used, such as cork and wood sourced from nearby forests managed ecologically following proper chain of custody processes. The biogenic carbon capture of these materials helps mitigate emissions.

Most of the joinery is done using dry construction, which will allow many of the components to be removed and recycled, facilitating the possibility of taking part in the future of a circular construction. In order to reduce the ecological impact, the number of layers of facing is kept to a minimum, leaving the cross-laminated structural timber and the utility networks in plain sight. This limited use of material is heralded as an opportunity to explore other aesthetics without sacrificing the affective dimension of the indoor and outdoor spaces.

137 NEKO by elii. Photograph by ImagenSubliminal.
137 NEKO by elii. Photograph by ImagenSubliminal.

Lastly, the inhabitants’ participation will prove crucial to fine-tuning the ecological behaviour of the house based on daily rituals that range from raising and lowering the venetian blind to habits in recycling, composting, making efficient use of water, etc. 

More information

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Architects
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elii. Lead architects.- Uriel Fogué, Eva Gil, Carlos Palacios.

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Project team
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elii.– Teresa Martínez Pagés.

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Collaborators
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elii.– Teresa Martínez Pagés, Javier Elices, Jorge Zurita.
Surveyors.- Samuel Escudero Arias – BTA (Building Technical Assistance).
Structures .- Altermateria y Mecanismo.
Instalations.- Andrés Español – Tak Arquitectura.
Models.- María Jerez, Teresa Martínez Pagés.

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Builder
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Servicios y Reformas SAS, Aniceto Jiménez.

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Developer
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Ángela Melado, Álvaro Valle.

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Area
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126.10 sqm.

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Dates
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2024.

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Location
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Valdetorres de Jarama, Madrid, Spain.

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Photography
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ImagenSubliminal.- Miguel de Guzmán + Rocío R. Rivas.

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elii is an architecture practice founded in Madrid in 2006 by Uriel Fogué, Eva Gil, and Carlos Palacios. Their professional practice extends to teaching (Madrid School of Architecture, ETSAM; Columbia University in the City of New York, GSAPP; École Polytechnique Fédérale de Lausanne, EPFL) and research. elii participated in the Spanish Pavilion at the 18th (2023) and 15th Venice Architecture Biennales (2016, the latter awarded the Golden Lion). They were invited to participate in the 24th Milan Triennale International Exhibition (2025). Two of their projects have been shortlisted for the European Union Prize for Contemporary Architecture: the Mies van der Rohe Award (2015, 2019). They were recognized, among others, with the Casa de la Arquitectura Award in the ES_INNOVACIÖN category and the ALDES Award for the best project in sustainability, decarbonization, or greater self-generation of energy in a building, Rebuild (with Husos, 2026); the Holcim Awards Gold Award 2023 (with Husos and Ultrazul, sponsored by the Daniel and Nina Carasso Foundation). First Prize COAM (2017) and COAM Award (2018, 2016, 2013, 2011, 2006). FAD Ephemeral Interventions Award (2020). FAD Opinion Award (2005) and Finalist and Selected for the FAD Award (2023 and 2017; and 2020 and 2018, respectively). Their work Yojigen Poketto was selected as one of the 20 visionary domestic spaces of the last 100 years in the exhibition 'Home Stories 100 Years, 20 Visionary Interiors', at the Vitra Design Museum, Weil am Rhein (2020). They are authors of the books: 'Super Petites Maisons' (EPFL, 2022), 'Traspasar los límites' (CentroCentro, 2020), 'What is Home Without a Mother' (HIAP – Matadero Madrid, 2015), awarded at the XIII Spanish Biennial of Architecture and Urbanism 2015, and co-editors of the publication UHF, included in the Archive of Creators of Madrid.
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Published on: June 26, 2025
Cite:
metalocus, SARA GENT
"A home connected to the ecosystem. 137 NEKO by elii" METALOCUS. Accessed
<https://www.metalocus.es/en/news/home-connected-ecosystem-137-neko-elii> ISSN 1139-6415
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