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Office · Hamamatsu, Shizuoka · Banking

Hamamatsu Iwata Shinkin Bank — Hamamatsu: a bank built like a Japanese house

A regional credit union in Shizuoka rejected the choice between private rooms and one big room. It built its head office the way a traditional Japanese house is built — distinct places, loosely joined — and gave two of them the names of parts of a house.

Company Hamamatsu Iwata Shinkin Bank (浜松いわた信用金庫)Building Head office block, ten storeys; working floors 5F–9FAlso in the block Canteen 4F, meeting rooms 3F, back office 2F, entrance 1FMaterials Tenryū cypress inside; terracotta louvres outsideNamed places Engawa, HanareWay of working ABW — choose where to workWebsite hamamatsu-iwata.jp ↗
The working floor
The working floor

Concept

Neither private rooms nor one big room

The brief was written against a choice the company refused to make. Not private offices, not a single open plan — instead, a floor where distinct places with characters of their own sit scattered but loosely connected, the way a traditional Japanese building is arranged.

Underneath that is an organisational idea. The heads of department and the executives are gathered at the centre of the floor, with the department groups arranged around them, because the aim the office was given was to make decisions faster.

A meeting at the centre
A meeting at the centre
The window counter
The window counter

01 · The counter

Along the louvres

The window side runs as a long counter behind the terracotta louvres, which control the sun and the sightlines while keeping the view of Hamamatsu Castle.

The window counter
The window counter
Seating behind the screens
Seating behind the screens

02 · Engawa

The veranda, indoors

One of the named places is the engawa — in a Japanese house, the wooden veranda between the room and the garden, neither inside nor out.

The engawa seating
The engawa seating

03 · Hanare

The room set slightly apart

The other is the hanare, the detached room. Timber ceilings and a lower light make it read as a different building even though it is a few steps from the desks.

The hanare
The hanare

04 · Planting and texture

Deliberate unevenness

Natural materials were chosen so the surfaces vary — terracotta tile and timber, with the texture, angle, thickness and length made deliberately uneven so that light and shadow are never flat. The company notes that this also means marks and colour variation do not show, which cut waste during construction.

Planting on the floor
Planting on the floor

05 · Canteen and terrace

Down from the office

Below the working floors are the canteen and the roof terrace. The canteen has sofa seats and booth seats chosen so that posture changes, and it runs as a café until the evening, which turns it into a casual meeting place.

The roof terrace
The roof terrace

06 · The louvre

What makes the light

The outer skin is a terracotta louvre whose angle changes gradually across the façade, so that it reads as a stand of trees. With the cypress inside, the company set out to make the light indoors feel like walking through woodland.

The louvre from outside
The louvre from outside
CompanyHamamatsu Iwata Shinkin Bank
Design[to confirm]
Photography© Hamamatsu Iwata Shinkin Bank (from the bank’s own site)
SourceHamamatsu Iwata Shinkin Bank, “The thinking behind the head office”, re-reported by WALL ↗
PublishedSeptember 2026
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