Aatismo Haniyasu House Extension in Japan Mimics Ceramic Glaze Streaks

This article examines how the architecture practice Aatismo renovated Haniyasu House, a 1967 single-storey residence in Kamakura. The house was transformed into a living and working home for Keita Ebidzuka, Eriko Masunaga, and the ceramicist parents.

The renovation involved stripping the building back to its timber frame and adding four corner volumes. An earth-colored, waste-derived coating was applied, blending traditional craft with modern design and sustainable materials.

Project scope and renovation approach

The project started with careful demolition of non-structural elements. After a typhoon left the home structurally unsound, the team returned it to its timber frame.

The core was reinforced with four contrasting corner volumes. This transformed the plan into a multi-volume composition while keeping the single-story footprint.

The central original footprint is now an open atelier, living room, and kitchen. Sliding glass doors open the space south onto a terrace.

Kamakura becomes a stage for a hybrid of domestic living and artisanal practice. Traditional craft influences the architectural form.

Structural augmentation and corner volumes

The four corner volumes are shaped as trapezoidal prisms with rounded edges. This visually carves the house into a timber-framed lattice that supports new uses and connections.

Each volume is timber-framed, insulated, and clad in timber panels, then finished with a textured, earthen coating. The volumes provide distinct programs: two for the parents’ pottery workspace and sleeping areas, one for the studio founder, and the fourth as a tatami-lined tea room and guest bedroom with a central skylight.

The geometry of the corner volumes creates intimate, cave-like interiors. The tactile quality contrasts with the lightness of the timber frame.

Materials and surface language

The finish is waste-driven and earth-bound. The earthen coating uses bisque-fired clay from the parents’ ceramics, site soil, and plaster mixed with waste iron and copper powders.

This mix creates streaked layers that mimic ceramic glazes and connect the building to its material context. The color shifts from blue-green at the top, through orangey browns in the middle, to green-greys near the base.

The dynamic surface looks like both glaze and terrain. Inside, the volumes have a rough, cave-like plaster finish that reinforces a sheltering, craft-focused environment.

Spatial layout and interior program

The central footprint is an open atelier, living room, and kitchen designed to capture southern light. Three corner volumes support sleeping and work areas: two for the parents’ pottery, one for the studio founders.

The fourth volume is a tatami-lined tea room and guest bedroom with a skylight for daylight and views of the sky. The layout supports a seamless relationship between making and living.

Conceptual framework and craft techniques

The project is inspired by the Japanese earth deity Haniyasu and the idea of a primitive settlement where life and creation are connected. This reference guides material choices, spatial logic, and rituals in the home.

The design incorporates ceramic techniques to evoke serendipity and temporal change as part of the architecture. These elements are not just decorative, but integral to the experience of the house.

Earth deity inspiration and glaze techniques

Keita Ebidzuka and the team use Haniyasu as a narrative link to earth, soil, and ceramic culture. The architectural language borrows glaze-making ideas, such as nagashigake (glaze pouring) and the oxidation of metallic powders, to introduce chance and change into the building.

The facade and interior appear to weather over time, reflecting a living process. Ceramic craft shapes both the exterior colors and the tactile interior, inviting slow, attentive engagement with the house.

Temporal change and material alchemy

The coating combines industrial ceramics waste with mineral soils to create layered surfaces that shift with light, humidity, and wear. Using waste materials supports sustainability and turns by-products into expressive architectural skin.

This approach echoes traditional Japanese craft, where age and patina are valued as part of a building’s character.

Outcomes, sustainability, and significance

The Haniyasu House renovation shows how a modest timber residence can become a contemporary atelier-home. This transformation keeps its warmth, tactility, and cultural resonance.

The four corner volumes expand the program and create distinct spaces for living, sleeping, and making. The central open space maintains social connectivity and brings in daylight.

The earth-based finish, made from ceramics waste and site materials, offers a sustainable alternative to conventional cladding. This finish prepares the project for future changes and natural aging.

Key design features include a multi-volume composition and a central open plan. Waste-derived earthen coatings and a tea room with a skylight support a lifestyle devoted to craft and making.

• Corner volumes provide sleeping, work, and tea room functions, enriching the program and reinforcing the timber frame.
• The earthy, streaked coating uses ceramics waste and site soils, creating a living surface that ages gracefully.
• The central footprint stays open as an atelier, living room, and kitchen, linking making and daily life.
• The tatami tea room doubles as a guest bedroom with a skylight, balancing privacy and openness.

Photography by Shinya Sato highlights the craft-driven story of this Kamakura renovation. The project contributes to contemporary architecture by honoring material ethics, craft, and place.

 
Here is the source article for this story: Aatismo references ceramic glazes for streaked house extension in Japan