Wallimann Reichen Packs a Loft House in Miniature into a Tight Basel Plot

In the Matthäus quarter of Kleinbasel, where small craft workshops once hummed behind narrow residential fronts, a plot of roughly 7 by 10 meters does not leave much room for ambiguity. Wallimann Reichen, the Basel practice led by Nicole Wallimann and Christoph Reichen, replaced a structurally compromised older building on this site with a four-story volume that pushes right up against the constraints of local building law, including a mandatory 45-degree sunlight incidence angle that sculpts the roof profile. The result, completed in 2021 on a budget of 1.8 million CHF, is a building that treats compactness not as a limitation but as a generative condition.

What makes the Blaesi House interesting is how it refuses to feel small. An off-center circulation core organizes each standard floor as a continuous loop, letting residents move through rooms without dead ends or corridors that consume precious area. South-facing lift-and-slide windows turn dining spaces into open loggias when weather permits, compensating for the absence of balconies. The building's material palette, anthracite corrugated fiber cement outside and white-painted brick masonry inside, is deliberately restrained, letting proportion and daylight do the expressive work. It is a loft house in miniature format, and it earns the comparison.

Streetscape Calibration

The Kleinbasel block is a patchwork: brick party walls, plastered facades, metal balconies, the occasional industrial remnant. Wallimann Reichen calibrate the new facade to this context without mimicking it. Horizontal bands of corrugated fiber cement in dark anthracite set a rhythm that echoes the fenestration proportions of neighboring buildings, while aluminum-framed windows sit flush in the plane. The corrugation catches light differently throughout the day, giving the surface a quiet liveliness that flat cladding would lack.

Rose-colored awnings, visible when deployed, are a small but telling gesture: they reference the color scheme of the adjacent building, a nod that signals awareness of the street as a shared composition. Ground-level planting softens the threshold. From across the road, the building reads as both new and familiar, occupying its slot with the confidence of something that has always been there.

The Roof as Negotiation

The gabled profile is not a stylistic choice. Basel's building regulations enforce a sunlight angle that literally carves the upper volume, and Wallimann Reichen maximize the envelope within those constraints to create a maisonette attic apartment. Tilted dormers puncture the sloped roof, pulling light into the uppermost rooms without exceeding the permitted massing. Inside, the diagonal wood-clad ceiling of the attic space compresses and expands as you move through it, turning regulation into spatial drama.

A cushion on a woven mat beneath a low window: the attic photograph captures the intimacy that this kind of small-scale housing can achieve when the architect treats every cubic meter as finite and valuable. The concrete walls ground the room while the timber ceiling warms it. There is nothing superfluous here.

Loop Plans and Perceived Generosity

The standard floor plan hinges on a single move: placing the circulation core off-center so that the remaining space wraps around it as a continuous loop. Kitchen flows along the eastern fire wall into bathroom, living area opens toward the south windows, and you can always keep walking. In an apartment this compact, the elimination of corridors is not a luxury; it is the difference between feeling cramped and feeling free. The open floor plan reads as a loft precisely because of this circulatory continuity.

Exposed concrete ceilings and gray cement screed provide a consistent material datum across all rooms, while colorless lacquered MDF panels for kitchens and sliding doors keep the built-in elements visually quiet. The bentwood chairs at the window, the wooden sideboard against sheer curtains: these interiors reward restraint with a sense of calm that more decorated spaces rarely achieve.

Material Honesty at Close Range

The galley kitchen is pure pragmatism: stainless steel countertops under an exposed concrete ceiling, with natural daylight entering from the side. There is no backsplash tile pattern, no accent color. The surfaces are what they are. In the bathroom, a circular steel sink sits below a window framing bare winter branches, and the composition is almost Japanese in its economy. The compact bedroom deploys a timber door and a cast concrete ceiling under a window alcove that does double duty as headboard zone and light source.

These are not expensive materials. Industrial masonry, cement screed, MDF, and aluminum windows belong to a construction economy that prioritizes durability and legibility over finish. Wallimann Reichen demonstrate that when dimensions are tight, material consistency becomes the primary tool for spatial coherence. Every surface earns its place.

The Ground-Floor Studio

Kleinbasel's historic character depends on mixed-use ground floors: workshops, studios, small businesses animating the street. The Blaesi House continues this tradition with a two-story studio that includes a ground-level meeting area connected by staircase to an overheight basement workspace. The program is not incidental; it is a direct response to the neighborhood's DNA.

The studio's concrete walls and floor-to-ceiling linen curtains create a workspace that can be partitioned or opened at will. A narrow desk against the wall, filtered daylight, and nothing else: this is an architecture of productive austerity. The building does not merely house people above and work below; it weaves the two together through a shared material language and a single structural logic.

Plans and Drawings

The site plan reveals the building's predicament: a slender rectangle wedged into an urban block with minimal setbacks on all sides. The floor plans, read in sequence from ground to attic, show how the off-center spiral stair organizes each level differently while maintaining the loop principle. The narrow service zone, containing kitchen and bathroom, stacks consistently along the eastern party wall, freeing the remaining plan for inhabitation.

The section drawing is the most revealing document. Four stories plus basement, a gabled roof cut to the mandated sunlight angle, and a spiral stair threading through the entire height. The basement studio's double height becomes legible here, as does the compression of the attic maisonette. Every vertical centimeter is accounted for. At 1,408 cubic meters of total volume, this is architecture measured not in impressions but in cubic capacity.

Why This Project Matters

The Blaesi House is a counter-argument to the notion that dense urban infill requires either heroic formal gestures or resigned minimalism. Wallimann Reichen operate in a third space: rigorous pragmatism that produces genuine spatial pleasure. The loop plan, the maximized roof volume, the material consistency from basement to attic, these are not innovations in the flashy sense but disciplined applications of well-understood principles to a genuinely difficult site. The building proves that a 7-by-10-meter footprint can feel generous if the architect respects the intelligence of the plan.

At a moment when European cities are grappling with housing density, affordability, and the preservation of neighborhood character, a project like this offers a credible model. It maintains the mixed-use ground floor, it fits four apartments into a volume that reads as a single house, and it costs 1.8 million CHF, roughly what a single luxury apartment fetches in central Basel. The building does not announce itself. It simply works, floor by floor, room by room, and that is exactly what Kleinbasel needs.

Blaesi House & Studio by Wallimann Reichen (Nicole Wallimann, Christoph Reichen), Basel, Switzerland. 450 m², completed 2021. Photography by Rory Gardiner, Ivo Stani, and Lukas Kissling.

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