Portuguese architecture practice Extrastudio. was commissioned to design Casa Plaj. As they themselves explain, the project was born by chance. The clients were travelling through Portugal when they came across a small plot of land for sale by the sea, near a town located approximately one hour north of Lisbon. Lourinhã is known as the country's fruit-growing center and for its proximity to Ericeira and Peniche, two of the world's best surfing spots.

Unlike other nearby areas, Lourinhã has never been a wealthy area. The buildings in its surroundings are modest and simple, blending naturally into the landscape, in a way that has, to some extent, been forgotten by the construction of recent decades.

Extrastudio designed the project on a narrow, steep plot, surrounded by nature, with a privileged position just five-minutes walk from the beach, with panoramic views of the ocean, the valley, and the town in the distance.

The architects conceived the house with a program free from daily constraints, a vacation home that allows a certain degree of freedom and experimentation. A home that should be generous, informal, physically present, and impose its own rhythm.

With this premise, they created a radically simple form for the house, combining elements used in local historic buildings in a way that is only possible in the present.

In the words of Extrastudio, "The relationship with the topography was fundamental: the house grazes the ground as lightly as possible, allowing the existing terrain to flow downward. Four load-bearing walls support a cruciform podium, on which the house sits, suspended above the ground. The platform only touches the sloping terrain once to allow access, while the other sides house terraces that float in the air in all directions and extend the interior space to the exterior, giving each room its own private refuge."

Casa Plaj por Extrastudio. Fotografía por Clemens Poloczek

Casa Plaj by Extrastudio. Photograph by Clemens Poloczek.

Description project by Extrastudio 

A void is cut from the solid form of the house to make an open-air courtyard entrance, enclosed by a large, sliding gate. Organised on one level, the kitchen, dining, and living share a generous space, which opens symmetrically to the north, east, and west, while the three bedrooms face south.

Restricted to a maximum enclosed area of 120m2, the interior compensates for the small footprint by taking full advantage of the volume’s height, creating an unexpected sense of grandeur and scale. A large skylight reinforces this impression in the living room, while elsewhere a series of oculi, designed precisely within the structure’s geometry using a 3D model, allow direct light from the skylight to cut through the house, reaching its darkest areas. For four months of the year, a beam of light illuminates each room before sunset, reaching peak intensity at the summer and winter solstices.

Casa Plaj by Extrastudio. Photograph by Clemens Poloczek.
Casa Plaj by Extrastudio. Photograph by Clemens Poloczek.

Simple architectural devices enable and encourage flexibility and informality.  The windows recede completely into the walls, transforming the house into a large alfresco space, extending the indoors outdoors and allowing moments like bathing to become open-air experiences.

Close dialogue between the clients and builder during construction allowed time, chance and workers’ knowledge to leave their marks on the house. Grey plastered walls were left bare, making a monochrome interior. New portholes and niches were added where possible, a steel door in the stairwell was replaced with red glass, Iranian silver travertine and blueish-green marble were chosen to match the interior walls, and the exterior, intended to be grey, finally gained colour.

Casa Plaj by Extrastudio. Photograph by Clemens Poloczek.
Casa Plaj by Extrastudio. Photograph by Clemens Poloczek.

Outside, a long swimming-pool stands among wild pine trees, parallel to the sea. The landscape was barely touched. All existing trees were retained and a grid of fruit trees was planted on the slopes, to preserve the agricultural character of the surroundings.

Our clients invited us to stay at the house after its completion. The only sounds in the air were the waves breaking onto the shore and voices from the far side of the valley. At night, birds we did not know warbled, and croaking frogs from a nearby creek kept us company.

More information

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Architects
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Project team
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João Caldeira Ferrão, João Costa Ribeiro, Sónia Oliveira, Rita Rodrigues, Andreia Simões, Marta Oliveira, Filipa Almeida, Mariana Brandão.

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Collaborators
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Landscape Architecture.- Oficina dos Jardins - Sónia Caldeira, Inês Bordado. Structural Engineering.- Pedro Viegas. Plumbing Engineering.- Motoliveira - Sandra Mota. Electrical, HVAC, Building Physics, Acoustics.- Blueorizon. Quantity Surveyor.- Rui Folgado.

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General Contractor
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Vassalo & Sousa Lda.

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Area / dimensions
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Single family house, 120 m².

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Dates
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2020-2025.

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Venue / Location
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Lourinhã, Portugal.

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Photography
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Photography.- Clemens Poloczek.
Model photography.- José Pedro Marques.

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Extrastudio is a Lisbon-based architecture practice established in 2003. The office develops small and large projects, with programs ranging from housing to retail and public space. In recent years, they have received public commissions for the design of waterfront and urban parks, and have also worked with private clients on the design of mixed-use buildings and houses. They focus on master planning, architecture and interior design projects.

João Caldeira Ferrão. Degree in Architecture, Lisbon Technical University School of Architecture, 2000.  Fakultät Für Architektur RWTH Aachen, 1999. Office for Metropolitan Architecture (OMA-AMO: Rem Koolhaas) in Rotterdam, Netherlands, 2000.  Herzog & de Meuron in Basel, Switzerland, from 2000 to 2003. Teacher at Universidade Independente in Lisboa from 2004 to 2006.

João Costa Ribeiro. Degree in Architecture, Lisbon Technical University School of Architecture, 2000. Escuela Técnica Superior de Arquitectura de Madrid, 1999. Post-graduate studies in Architecture and History of Architecture, Coimbra University, 2003. In Lisbon worked at Atelier do Chiado Arquitectos, Contemporânea Arquitectos e Atelier Central. Office for Metropolitan Architecture (OMA-AMO: Rem Koolhaas) in Rotterdam, Netherlands, 2000. Board member of the South Section of the Portuguese Architects Association in 2016/2013, 2009/2007 and 2006/2004

Sónia Oliveira. Degree in Architecture, Lisbon Technical University School of Architecture, 2003. PMP Architecture in Glasgow from 2007 to 2008.

Rita Rodrigues. MA in Architecture, ISCTE - Lisbon University Institute, 2014.

Bruna Couto. MA in Architecture, Lisbon University School of Architecture, 2024.

Marta Nogueira. MA in Architecture, Instituto Superior Técnico, 2025.

Ana Teixeira. MA in Architecture, ISCTE - Lisbon University Institute, 2025.

Tiago Mota. Degree in Architecture, Universidade Moderna de Lisboa, 2004. Master's in housing, Escuela Técnica Superior de Arquitectura de Madrid, 2010. José Adrião Arquitetos, from 2003 to 2009 and from 2015 to 2017. Board member of the South Section of the Portuguese Architects Association from 2010/2012 and 2013/2016.

Awards

EUMiesAward 22 (Selected), Barcelona, Spain.
FAD prizes 2017 (Finalist), Barcelona, Spain.
ENOR prizes 2017 (Selected), Vigo, Spain.
BigMat International Architecture Award 2017 (Selected), Luxembourg.
Horta's Waterfront (1st prize), Faial, Azores, 2013.
Contractworld Awards 2010 (Mention), Hannover, Germany, 2010.
Contractworld Awards 2010 (Selected for Next Generation Award), Hannover, Germany, 2010.
Can Escandell Park (Mention), Ibiza, Spain, 2010.
La Hoya Park (Finalist), Almería, Spain, 2010.
São Jacinto Dunes Natural Park Headquarters (2nd Prize), Aveiro, Portugal, 2009.
Tavira Island Masterplan (1st Prize), Tavira, Portugal 2009.
Garrão Beach Masterplan (2nd Prize), Faro, Portugal, 2009.
Fuseta Beach and Fuzeta Island Masterplan (3rd Prize), Fuseta, Portugal, 2009.
Valdebebas Urban Park (Mention), Madrid, Spain, 2009.
Green Project Awards (Mention), Lisbon, Portugal, 2008.
Légua Beach Masterplan (1st Prize), Alcobaça, Portugal, 2007.
Organic Award, San Francisco, USA, 2007.
Pinhal Novo Elementary School (2nd Prize), Palmela, Portugal, 2007.
Cenário Urbano (1st Prize) Lisbon, Portugal, 2007.
Galé/Salgados Beachfront (2nd Prize), Albufeira, Portugal, 2007.
Hidrographic Institute Building (2nd Prize), Lisboa, 2006.
Headquarters for the Montesinho Natural Park (2nd Prize), Bragança, Portugal, 2005.
Headquarters for the North Section of the Portuguese Architects Association (Mention), Oporto, Portugal, 2005.

Read more
Published on: August 12, 2025
Cite:
metalocus, SARA GENT, INÉS LALUETA
"Blending naturally into the landscape. Casa Plaj by Extrastudio" METALOCUS. Accessed
<https://www.metalocus.es/en/news/blending-naturally-landscape-casa-plaj-extrastudio> ISSN 1139-6415
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