Japanese style houses, Washitsu rooms and room size measurement, Living in Tokyo

Rooms in traditional Japanese style are called Washitsu, comprise of Tatami mats spread on the floor and wood fittings that include Shoji and Fusuma.

Traditional Japanese-style rooms (washitsu) come with a unique interior design that includes tatami mats as flooring. An example from an Onsen (Hot Springs) Hotel. This style dates back to the Muromachi Period

A Guide to Tatami and Tatami Mats - JapanLivingGuide.net - Living

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Traditional Japanese-style tatami rooms

Tatami Rooms' in Japan: An introduction - Super Sugoii®

Introduction to Japanese-style room “washitsu” at onsen ryokans, SELECTED ONSEN RYOKAN

Making a House a (Typical) Japanese Home

What Is the Purpose of a Tatami Room?

Interior of a traditional Japanese style room in a ryokan, Kyoto

Prefab Japanese Pavilion, Traditional Japanese Architecture

The decline of traditional Japanese tatami flooring - Japan Today