Logo Alventosa Morell Arquitectes

Casa GE

Façade of Casa GE in Seva, with a brick base, timber-clad upper volume with clerestory windows and a metal roof amid the woodland.

16

Casa GE

The house is located in Seva, a town in the Osona region next to the Montseny Natural Park. The plot, triangular in shape and with a steep slope, is bordered by two streets and enjoys excellent orientation. The clients requested a warm, intimate house, open to the garden and with low energy demand. The project meets these needs by placing the house at the flat upper part of the plot, with access from the north, thus avoiding unnecessary earthworks and making the most of the site’s topography.

Exterior corner with a dark timber-clad gable over a brick base and a porch on timber posts, open to the Montseny woodland.
Interior corridor with white walls, a pine timber ceiling and timber-and-glass doors opening to the garden over a polished concrete floor.

The project is structured around a timber frame system that defines a large open-plan space facing south, where the porch, living room, dining area, kitchen and bedrooms unfold in sequence — all open to the garden and views. The enclosed wet areas are placed to the north, beneath a flat roof, while the rest of the spaces are organised under a pitched roof. This arrangement ensures privacy from neighbouring houses located at a higher level to the north.

Topographic site plan of Casa GE, the house footprint highlighted in red within the village fabric.Exploded axonometric of the construction system: roof, brick walls, timber portal frames and foundation slab.Roof and site plan on the triangular plot, with the garden, trees and vehicle access.Floor plan of Casa GE, with furnished rooms opening to the garden and the parking access.Longitudinal section over the sloping site, with human figures and the cross-ventilation path traced.Cross section with the sloping roof and arrows showing solar gain and natural ventilation.

The volume is conceived as a large timber ‘hat’ that wraps the house, contrasting with the ceramic base that creates a more solid and intimate feel. The ceramic façades stop at lintel height, above which a black-stained ventilated timber façade and a tiled roof define the rest of the envelope. Inside, the pitched pine ceiling and skylights create a visual and thermal separation between the two structural systems, reinforcing the lightness of the timber frame.

Kitchen of Casa GE with a pine ceiling and clerestory windows, white cabinets and a plywood island.
Corridor with a pine timber ceiling and beams, white walls and a polished concrete floor leading to the sunlit kitchen.
Brick façade with lattice screens filtering the sun, timber sliding doors and a black-tile roof beneath the oaks.
Dining-kitchen with a pine timber ceiling on exposed trusses, table with black chairs, timber island and glass doors to the garden.

The bioclimatic design —with southern orientation, cross ventilation, solar gain and summer shading— significantly reduces energy demand, allowing the house to function without cooling systems and to maintain thermal comfort in winter with a single pellet stove. To minimise the home’s carbon footprint, the design prioritises PEFC-certified timber (used in the roof, windows, interior finishes and façade), cellulose insulation, biomass-fired ceramic, and the preservation of existing trees.

Project
Casa GE
Year
2021
Location
Osona
Programme
Single-family house
Area
110 m2
Authors
Marc Alventosa, Xavier Morell
Team
Júlia Marbà (architecture) Diagonal Arquitectura (structure), Adrià Casajuana (technical architect)
Adrià Goula