二 重 窓(にじゅうまど)

にじゅうまど

noun

double window; double-glazed window

1. double window; double-glazed window

A window with two layers of glass — either a single frame containing two panes (double glazing) or two separate window frames installed one in front of the other — used to improve insulation against heat, cold, and noise. Common in cold regions and increasingly installed in ordinary homes for energy efficiency and soundproofing.

二重窓(にじゅうまど)の部屋(へや)。

A room with double windows.

二重窓(にじゅうまど)にしてから部屋(へや)が暖(あたた)かくなった。

After installing a double window, the room has become warm.

線路(せんろ)に近(ちか)いアパートだったので、二重窓(にじゅうまど)にして騒音(そうおん)を軽減(けいげん)することにした。

Since the apartment was close to the train tracks, we decided to install double windows to reduce the noise.

Composed of 二重(にじゅう) (double, two-layered) and 窓(まど) (window). In Japanese, 二重窓(にじゅうまど) covers both what English-speakers call "double-glazed windows" (one sash with two panes) and what are called "storm windows" or "secondary windows" (a second window frame added inside an existing one). Home renovation ads often use it for the latter type.

Cultural note

Traditionally associated with cold regions such as Hokkaido and Tohoku, where 二重窓(にじゅうまど) are essential for winter insulation. In recent years they have spread across Japan as a retrofit for soundproofing (especially near busy roads or rail lines) and for reducing heating/cooling costs.

Common collocations

二重窓(にじゅうまど)にする: to install a double window
二重窓(にじゅうまど)工事(こうじ): double-window installation work
二重窓(にじゅうまど)の効果(こうか): the effect of a double window
断熱(だんねつ)二重窓(にじゅうまど): insulated double windows

Similar words

複層(ふくそう)ガラス: multi-layer glass — the technical term for double-/triple-glazed glass
内窓(うちまど): inner window — a second window added inside an existing frame
サッシ: window sash / frame
断熱(だんねつ): heat insulation — the goal of installing 二重窓(にじゅうまど)

Related Words

Compare: 断熱(だんねつ) (heat insulation)

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Added 2026.4.11 23:19 · Revised 2026.9.2 13:02

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