BOOST is an architectural practice based in Lisbon, Portugal, experienced in new-built and refurbishment projects. Our work goes from the early stage of the projects up to its construction, involving our clients, public municipalities, consultants and builders throughout the process. We’re constantly pursuing the best architectural, economical and social solutions, allied to the rigor, excellence and ambition facing each and every challenge.

Project Name: CT 37
Architect Name: BOOST studio

E-mail: [email protected]
Location:  Lisboa, Portugal
Year of completion: 2016 Built-up area: 300 m
Photography: Francisco Nogueira
Photographer’s Website:
Architectural team: João Dantas, Fábio Paulo
General contactor: Masterobras
Contractor’s website:
Link to project:

CT 37 By BOOST studio - Sheet14This apartment is part of a 1914’s corner building, located in the traditional neighborhood of Campo de Ourique, in Lisbon. The building is a late “Pombalino” style construction, with the exterior walls in stone with a mortar clad, and the interior walls in wooden structure. It has a very strong presence at the intersection of the two streets due to its simple but carefully designed façade and a fairly high roof fascia, which hides the presence of the cross-hipped tile roof.

CT 37 By BOOST studio - Sheet15Existing building

The building has a left-right typology, and the apartment we refurbished occupies about two-thirds of the floor area on the top floor. It is a typical apartment of this historical and constructive period, with a long interior corridor that serves several compartments of very similar dimensions facing West. At the end of the hall is the kitchen (facing East) with access to the only existing bathroom. The roof void, with a 2,7m head height at the ridge was not used. Its construction consisted only of poor hardwood flooring, which made the rooftop apartments thermally very uncomfortable.

Concept and program

We proposed to our clients to extend the apartment to the attic, since they would be the only ones that could do it.

After this program transformation we aimed to increase the daylight inside the apartment, since the house only received it during the afternoon.

CT 37 By BOOST studio - Sheet18This strategy took form with the introduction of two roof terraces – one facing the East South quadrant and the other facing the North-West quadrant.

These terraces, alongside with the skylight of the main staircase of the building, take part in organizing the upper floor space – a multipurpose open-space space and a master suite.

The strategy of creating terraces (subtraction to the geometry of the cover) rather than dormer windows (addition to the roof) was followed so that, from an urban point of view, the presence of our intervention was the least intrusive possible, since these voids aren’t visible from the street.

CT 37 By BOOST studio - Sheet25The reorganization of the space on the lower floor was thought to include a living room with a double height void, well-lit from the two terraces above.

On this floor there is also a bathroom with access from the hallway, as well as the kitchen with adjoining dining area and two bedrooms.


The material strategy was set to preserve as much as possible the characteristics of the original building, with the existing wooden floor being recovered and the timber walls recovered. On the top floor we assumed a new structure in pine wood, while the existing roof structure was maintained where possible and replaced where necessary.

CT 37 By BOOST studio - Sheet27The upper floor finish, in solid wood floor of new pine, dialogs with the floor of the lower floor, one hundred years older, in an old-new dialectic that we wanted to assume. The kitchen and bathrooms, all brand new, have been coated with microcement, assuming their contemporaneity.


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