Circulation Flow｜Custom-built homes by architecture firms9Picks｜Designing for Ease of Living with Continuous Circulation

A “circulation” plan (kaikyū dōsen) is a layout strategy that enables movement through a home in a continuous loop rather than along one-way routes. It is a design approach that increases the flexibility of the floor plan and enhances everyday livability. Centered around the kitchen, a looped circulation can optimize household workflows by linking the pantry, washbasin, and laundry room; serve as an indoor play circuit where children can move freely; and, by providing multiple paths, create effective cross-ventilation routes. The benefits of continuous circulation are manifold. The design firm carefully analyzes family composition, daily rhythms, and household routines to design movement flows that are easy, intuitive, and low-stress, integrated directly with the spatial design. We present case studies of residences where daily life naturally and smoothly unfolds.

This glass house, a steel-wood-glass hybrid structure, is located within a 50 km radius of the city center on an approximately 220-tsubo site (≈727 m²) on the north bank of the Tokigawa River in Saitama Prefecture. It faces directly onto the Tokigawa with the Chichibu mountain range as its backdrop. The second-floor living level is organized as a looped circulation pattern, achieving an integrated thermal environment and daylighting under a single roof. Because the exterior walls have no operable openings, the building is equipped with a ventilation system that employs horizontally projecting, louver-like operable devices cantilevered from the second-floor slab combined with buoyancy-driven (stack) ventilation to exhaust air via a rooftop mechanical ventilator.

This is a fully separated two-family residence with high thermal insulation, engineered to seismic Grade 3 performance and augmented by a seismic-damping system. Because the surrounding context does not offer favourable views, the design adopts a courtyard-house typology; the street-facing volume is kept low to respect the streetscape, while inclined walls articulate the building’s relationship with the neighbourhood. A permeable circulation strategy, differentiated floor levels and deliberately controlled ceiling heights by function, together with the use of natural materials, produce a variety of spatial configurations while ensuring daylighting and natural ventilation.

An atelier-attached residence for an owner engaged in design. Situated in a residential neighborhood of Tokyo yet taking advantage of abundant south-facing greenery, the ground floor accommodates a ceramics atelier and a garden. The second floor separates sleeping quarters and wet areas from the open-plan living, dining and kitchen, while a central double-height void and a circulating floor plan reinforce spatial connectivity. A deck terrace and a spiral staircase provide continuity with the garden, creating a home where everyday life and creative practice are gently intertwined.

An architect's own residence located at the northern edge of the Nōbi Plain on a site with a pronounced level change where the plain meets upland terrain. The square plan is rotated 45° to reconcile openness and privacy by avoiding direct sightlines from the main road and neighboring houses. The site's elevation difference is used so that primary living spaces are on the second floor. A hybrid concrete-and-wood structure leaves materials exposed to express their natural qualities. The layout centers on the dining area and allows for continuous circulation so that, except for sleeping, daily life takes place on the second floor. Materials such as solid timber, brass, and stone were chosen to develop patina over time and to harmonize with the southern rural landscape.

A large steel-frame detached house was renovated by fully refurbishing the second floor to create a separated two-family residence: parents on the first floor and children on the second. A spacious 40-tatami living‑dining‑kitchen (LDK) is the focal point of domestic life; rooms and wet areas are arranged in a bead-like sequence along the window perimeter, while a large pantry and family closet occupy the central, unlit core to form a highly circulatory plan. The family closet is surrounded by an indirectly lit corridor, adding definition and contrast to the otherwise expansive space.

A 2LDK dwelling sited on a parcel elongated along the east–west axis. A roadway borders the east side, an approximately 2.0 m high embankment/retaining slope lies to the west, and a north-side diagonal plane (height) restriction applies, making the layout and the relationship to the exterior key considerations. The entrance includes an ample shoe closet; adjacent to the kitchen are a pantry and a utility/housework room; a dedicated study for remote work is also provided. A courtyard on the first floor secures daylighting for the 24-tatami LDK (approximately 39.6 m²). With the staircase as the organizing axis, service rooms are arranged in a continuous line to the north, while the living room and a workspace are located to the south. The design achieves thermal insulation grade 5, primary energy consumption grade 6, and seismic resistance grade 2.

The site is located on the suburban fringe near the city and is adjacent to parking and similar uses, so the design responds to privacy and noise considerations. The proposal is a single‑storey dwelling accented by a gabled (triangular) roof. The open-plan living/dining/kitchen (LDK) is a spacious volume with ceilings elevated to follow the roofline; within the living area a built-in sofa corner with a lowered ceiling and a bay-window bench are provided. The dining area opens onto a generous deck and garden, and the household work sequence runs from a bespoke kitchen through a pantry to the wash/wet room; the plan also incorporates a looped circulation connecting a small Japanese-style room (washitsu) and the bedroom.