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B1 noun #10,000 most common 11 min read

改築

Top 10,000

Practice it Examples Notes & Tips 改築 in 30 Seconds

Explanation 改築 in your Level:

At the A1 level, the word '改築' (kaichiku) might be a bit difficult because it is a formal word. However, it is useful to know that '改' means 'change' and '築' means 'build.' Think of it as 'Change-Build.' For beginners, you can just remember that it means 'to fix or rebuild an old house.' You will mostly see this on signs in Japan. For example, if a train station exit is closed, you might see this word. You don't need to use it in your own speaking yet, but recognizing the first kanji '改' (which you also see in 'kaizen') will help you understand that something is being improved or changed. Use the simple word 'naosu' (to fix) for now if you want to talk about fixing things.

At the A2 level, you should start to recognize '改築' (kaichiku) in reading materials like neighborhood posters or simple news stories. It means 'reconstruction.' A key thing to learn is that it is a 'suru-verb.' So, 'kaichiku suru' means 'to reconstruct.' You might use this when talking about your family home or a famous building in your town. For example: 'My house is old, so we will kaichiku suru.' It is more formal than 'naosu' (to fix). At this level, try to notice the difference between this and 'shinchiku' (a brand new building). If a building is 'kaichiku,' it was there before but was rebuilt. If it is 'shinchiku,' it is completely new from the ground up on a new site.

At the B1 level, you are expected to use '改築' (kaichiku) correctly in context. You should understand that this word specifically refers to structural reconstruction. It is not just about painting walls (which is 'reform' or 'kaisou'). You should use 'kaichiku' when discussing significant changes to a building's structure, like replacing the roof or changing the floor plan. This word is common in the JLPT N3/N2 level. You should be able to say things like 'The library is undergoing reconstruction' or 'I want to reconstruct this old house into a cafe.' Notice that it is a transitive verb, so you use the particle 'o' (e.g., ie o kaichiku suru). You should also be aware of the noun form 'kaichiku kouji' (reconstruction work).

At the B2 level, you should have a nuanced understanding of '改築' (kaichiku) compared to similar terms like 'zōchiku' (extension) and 'kaishū' (improvement). You should be able to use it in professional or formal settings, such as discussing urban development or real estate. For a B2 learner, it is important to know the legal nuance: 'kaichiku' implies rebuilding within the same area, whereas 'zōchiku' implies increasing the area. You should also be comfortable using the passive form 'kaichiku sareru' when talking about public projects. For example: 'The historic city hall was reconstructed while preserving its original facade.' Your ability to distinguish between structural reconstruction (kaichiku) and cosmetic renovation (reform/kaisou) is a sign of your advanced vocabulary.

At the C1 level, you should use '改築' (kaichiku) with precision in academic, legal, or high-level business contexts. You should understand the historical significance of reconstruction in Japan, such as the 'Shikinen Sengu' at Ise Shrine, and be able to discuss the cultural philosophy behind rebuilding structures periodically. You should be able to analyze the impact of 'kaichiku' on urban sustainability and seismic safety. Furthermore, you should be able to use the word in complex sentences involving architectural terminology. For instance, you might discuss the 'kaichiku' of a traditional 'kominka' and how it integrates modern earthquake-resistant technology while maintaining traditional aesthetics. Your usage should reflect an understanding of the word's weight and formality.

At the C2 level, you possess a native-like grasp of '改築' (kaichiku). You can distinguish it from every subtle synonym, including 'shūfuku' (restoration), 'fukugen' (reconstitution), and 'kaizen' (improvement). You are aware of the specific building codes and legal requirements associated with 'kaichiku' in Japan. You can use the word in high-level debates about architectural heritage, urban renewal, and the economic costs of reconstruction versus new construction. Your ability to use the word extends to metaphorical contexts in literature, though you primarily use it for its literal architectural meaning. You can effortlessly switch between formal architectural reports and casual conversations, choosing the most appropriate term for the structural renewal of a space without hesitation.

Practice it Examples Notes & Tips

改築 in 30 Seconds

改築 (kaichiku) means structural reconstruction or rebuilding of an existing building, often for safety or modernization.
It is a formal Sino-Japanese word (kango) and functions as a noun or a suru-verb (改築する).
It differs from 'reform' (cosmetic) and 'zōchiku' (extension) by focusing on structural integrity within the same footprint.
Commonly seen in real estate, government notices, and news regarding historical sites or public infrastructure.

The Japanese word 改築 (kaichiku) is a sophisticated noun that specifically refers to the act of rebuilding, reconstructing, or significantly renovating an existing structure. While it is often translated simply as 'renovation,' it carries a much deeper structural implication than the common loanword リフォーム (rifōmu). In the Japanese architectural and legal context, 改築 usually involves taking down a portion of a building—or even the whole thing—and rebuilding it while maintaining the original purpose or footprint of the site. It is a term you will encounter frequently in real estate, urban planning, and when discussing the preservation of historical Japanese homes known as kominka. Understanding this word requires looking at its two constituent kanji: 改 (kai), meaning 'to reform, renew, or correct,' and 築 (chiku), meaning 'to build or construct.' Together, they describe a process of renewal through construction.

Structural Scope: Unlike a simple paint job or floor replacement, 改築 often implies changes to the structural integrity of the building. This might include replacing supporting beams, changing the layout of the rooms significantly, or rebuilding the roof. It is a 'hard' renovation rather than a 'soft' cosmetic one.
Legal Distinction: In Japanese building codes, 改築 is strictly defined. It typically refers to rebuilding a structure with the same floor area and usage. If you are adding more space, the term changes to 増築 (zōchiku), which means 'extension' or 'expansion.'
Emotional Nuance: When a Japanese person says they are going to 改築 their family home, it often suggests a deep commitment to the property. It implies that while the building was old or damaged, the site and the essence of the home are worth preserving through a major overhaul.

「祖父母の古い家を改築して、新しいカフェをオープンすることにしました。」
(We decided to reconstruct my grandparents' old house and open a new cafe.)

Another critical aspect of 改築 is its relationship with the concept of shinchiku (new construction). While shinchiku is the dream for many in Japan due to the high value placed on brand-new things, 改築 is becoming increasingly popular as people recognize the charm of older materials, such as high-quality cedar or cypress beams that are no longer easily available. This shift is part of a larger movement towards sustainability and 'circular' living in modern Japanese society.

「この図書館は、来年から大規模な改築工事が始まる予定です。」
(This library is scheduled for major reconstruction work starting next year.)

When you hear 改築 used in the news, it often refers to public infrastructure. Schools, city halls, and train stations undergo 改築 to meet modern earthquake resistance standards (taishin). Because Japan is prone to seismic activity, 改築 is not just about aesthetics; it is a vital matter of public safety. Therefore, the word carries a weight of necessity and improvement, rather than just luxury renovation.

「地震に備えて、古い校舎を改築する必要があります。」
(In preparation for earthquakes, it is necessary to reconstruct the old school building.)

In summary, 改築 is a powerful word used to describe the transformation of a building. It bridges the gap between the old and the new, ensuring that while the structure changes, the history and purpose remain intact. Whether you are looking at a real estate brochure or discussing urban development, 改築 indicates a substantial, structural, and often legally regulated process of building renewal.

Using 改築 (kaichiku) correctly in a sentence requires an understanding of its grammatical role as a suru-verb and its specific focus on buildings. It is primarily used with nouns that represent physical structures, such as houses, schools, stations, and shrines. It is rarely used for abstract things like systems or organizations (for those, you would use kaizeu or kaikaku). Below, we explore the various ways to integrate 改築 into your Japanese communication, ranging from simple statements to complex professional descriptions.

The Verb Form: 改築する: Adding suru turns the noun into an action. This is the most common way to express the act of renovating.
Example: 「家を改築するのに三ヶ月かかりました。」 (It took three months to reconstruct the house.)
The Noun Form: 改築工事: When combined with kouji (construction work), it describes the project itself. You will often see this on signs near construction sites.
Example: 「現在、駅は改築工事中です。」 (Currently, the station is undergoing reconstruction work.)
Passive Usage: 改築される: When the focus is on the building being changed by someone else (like the government or a company).
Example: 「その古いお寺は来年改築される予定です。」 (That old temple is scheduled to be reconstructed next year.)

「予算が足りないので、家の一部だけを改築することにしました。」
(Since the budget is insufficient, we decided to reconstruct only a part of the house.)

When discussing 改築, you often need to mention the reason or the goal. Common reasons include aging (oika or roukyuuka), earthquake safety (taishinka), or a change in lifestyle (such as moving in with elderly parents). Using the particle tame ni (for the purpose of) is a great way to build these sentences.

「バリアフリーにするために、実家を改築しました。」
(I reconstructed my parents' home to make it barrier-free.)

In formal writing, such as business reports or architectural proposals, you might see 改築 paired with keikaku (plan) or hiyou (cost). These compound nouns allow for precise descriptions of large-scale projects. For instance, 'The reconstruction cost exceeded the budget' would be 「改築費用が予算を超えました。」.

「市役所の改築計画について市民の説明会が開かれました。」
(An explanatory meeting for citizens was held regarding the city hall reconstruction plan.)

Finally, it is worth noting the temporal aspect. 改築 is often a long-term process. Therefore, you will frequently see it used with continuous or future-oriented grammar patterns like ～ている (is ongoing) or ～する予定だ (is planned to). Understanding these patterns helps you talk about the timeline of a renovation project effectively.

The word 改築 (kaichiku) is not just a vocabulary word for textbooks; it is a living part of the Japanese landscape. If you live in or visit Japan, you will encounter this word in several specific real-world contexts. From the announcements at a bustling train station to the fine print in a real estate window, 改築 is the key to understanding how the physical environment is changing. Here are the most common places you will hear or see this word.

Public Transportation Announcements: Train stations in Japan are constantly being upgraded for better accessibility and flow. You will often see signs saying 「駅舎改築のため、出口が変更になります」 (The exit is changing due to station building reconstruction). Hearing this word at a station usually means you need to look out for temporary walkways or closed platforms.
Real Estate (Fudousan) Listings: When looking for an apartment or house, you might see 「改築済み」 (kaichiku-zumi), which means 'already reconstructed.' This is a huge selling point because it means the property has the charm of an older building but the safety and amenities of a new one. It is a sign of high value.
Local Neighborhood Notices (Kairanban): In Japanese residential areas, neighbors often share information via a clipboard called a kairanban. If a neighbor is going to 改築 their house, they will circulate a notice to apologize for the noise and dust. Seeing the word here is a cue to be patient with your neighbors.

「この駅は改築されてから、とても使いやすくなりましたね。」
(This station has become very easy to use since it was reconstructed, hasn't it?)

Another place you will frequently encounter 改築 is in the news, particularly concerning historical sites. Japan takes great pride in its temples and shrines, many of which are hundreds of years old. Every few decades, these structures undergo 改築 or shufuku (restoration). The news will report on the 'unveiling' of a newly reconstructed shrine, using the term to highlight the preservation of cultural heritage.

「伊勢神宮では、定期的に式年遷宮という大規模な改築が行われます。」
(At Ise Grand Shrine, a large-scale reconstruction called Shikinen Sengu is held periodically.)

Finally, in the business world, especially in the hospitality industry, 改築 is a sign of investment. A hotel might announce a 'renewal open' after a period of 改築. For travelers, this is a signal that the facilities will be modern and clean. Understanding this word helps you navigate Japan's physical changes with confidence, whether you are looking for a place to stay, a house to buy, or just trying to find your way through a station under construction.

When learning 改築 (kaichiku), English speakers often fall into several linguistic traps. Because English uses 'renovate' or 'rebuild' broadly, it can be difficult to grasp the specific legal and structural boundaries of the Japanese term. Avoiding these mistakes will make your Japanese sound much more natural and precise. Let's look at the most frequent errors.

Mistake 1: Confusing 改築 with リフォーム (Reform): This is the most common error. In Japan, リフォーム usually refers to cosmetic changes: new wallpaper, updated kitchen cabinets, or new flooring. 改築 refers to structural work. If you say you are going to 改築 your kitchen but you are just painting the walls, a Japanese person will expect a full demolition and rebuild.
Mistake 2: Confusing 改築 with 修理 (Shuuri): 修理 means 'repair.' It is used for fixing something that is broken, like a leaky roof or a broken window. 改築 is a planned improvement or reconstruction. You 'repair' a leak, but you 'reconstruct' (改築) the roof structure to make it stronger.
Mistake 3: Using 改築 for Non-Buildings: In English, we might say 'reconstructing a theory' or 'renovating a system.' In Japanese, 改築 is strictly for physical buildings. For a system, use 改善 (kaizen) or 改革 (kaikaku). For a theory, use 再構築 (saikouchiku).

❌ Incorrect: 「システムを改築しました。」
✅ Correct: 「システムを再構築しました。」
(You cannot 'reconstruct' a digital system using the building-specific word 'kaichiku'.)

Another subtle mistake is the register. 改築 is a formal kango (Sino-Japanese word). Using it in a very casual setting might sound a bit stiff. For example, if you are telling a friend you are fixing up your house for fun, 「家をいじっている」 (ie o ijitte iru - messing with the house) or 「直している」 (naoshite iru - fixing it up) might be more appropriate. Save 改築 for when the project is serious and substantial.

「改築」と「改装」の違いを知っていますか？
(Do you know the difference between 'kaichiku' [structural] and 'kaisou' [interior/exterior redesign]?)

Lastly, be careful with the kanji. The second character 築 is also found in kenchiku (architecture). It is a complex kanji, and confusing it with tsukuru (to make) or other similar-looking characters is a common writing error. Practice writing the 'bamboo' radical at the top to remember that building often involved wood and bamboo in traditional Japan.

Japanese has a rich vocabulary for construction and renewal. Depending on whether you are adding a room, painting a wall, or restoring an ancient monument, the word you choose will change. Understanding the nuances between 改築 (kaichiku) and its synonyms is essential for reaching an advanced level of Japanese proficiency. Let's compare the most common alternatives.

増築 (Zōchiku) - Extension / Expansion: Definition: Adding new rooms or increasing the total floor area of a building.
Difference: While 改築 means rebuilding within the same area, 増築 specifically means making the building bigger.
改装 (Kaisō) - Refurbishment / Remodeling: Definition: Changing the interior or exterior appearance of a shop or room.
Difference: 改装 is more about the 'look' (cosmetic), whereas 改築 is about the 'structure' (bones).
改修 (Kaishū) - Repair / Improvement: Definition: Fixing or improving parts of a building to restore its function.
Difference: 改修 is often used for large-scale infrastructure like bridges or dams, focusing on fixing wear and tear rather than a complete rebuild.
修復 (Shūfuku) - Restoration: Definition: Returning something to its original, historical state.
Difference: 改築 can involve modernizing a building, but 修復 specifically aims to make it look exactly like it did in the past.

「この古い家を改築するか、それとも一部を増築するか迷っています。」
(I am torn between reconstructing this old house or just adding an extension to part of it.)

Choosing the right word often depends on the context of the conversation. If you are talking to an architect, you must be precise. If you are talking to a friend about your kitchen, リフォーム is the most natural. However, if you are discussing the future of a city landmark, 改築 is the professional and accurate choice.

In summary, while 改築 is a powerful and specific word for reconstruction, having these alternatives in your 'linguistic toolbox' allows you to describe any kind of change to a physical space with precision and flair. Whether it's the small-scale 'reform' of a bathroom or the large-scale 'extension' of a warehouse, you now have the words to describe it.

How Formal Is It?

Fun Fact

The kanji '築' (chiku) has the bamboo radical (⺮) at the top because, in ancient Japan and China, bamboo was a primary material for scaffolding and reinforcement in construction.

Pronunciation Guide

UK /kaɪ.tʃɪ.kuː/

US /kaɪ.tʃi.ku/

Japanese is a pitch-accent language. For 'kaichiku', the pitch is typically 'Low-High-High-High' (Heiban style).

Rhymes With

新築 (shinchiku) 増築 (zōchiku) 建築 (kenchiku) 構築 (kōchiku) 蓄積 (chikuseki) 家畜 (kachiku) 修築 (shuuchiku) 進築 (shinchiku)

Common Errors

Pronouncing the 'u' too strongly at the end (it should be subtle).
Confusing the 'chi' sound with 'shi'.
Giving equal stress to all syllables like English (Japanese uses pitch, not stress).

Difficulty Rating

Reading 4/5

The kanji '築' is complex and requires N2 level knowledge to write, though N3 learners should recognize it.

Writing 5/5

Writing '築' correctly with the bamboo radical and the complex bottom part is challenging for learners.

Speaking 3/5

The pronunciation is straightforward, but knowing when to use it over 'reform' takes practice.

Listening 3/5

Clear pronunciation makes it easy to hear, though it can be confused with 'shinchiku' if not careful.

What to Learn Next

Prerequisites

家 (ie - house) 作る (tsukuru - make) 新しい (atarashii - new) 古い (furui - old) 直す (naosu - fix)

Learn Next

建築 (kenchiku - architecture) 増築 (zōchiku - extension) 改装 (kaisō - refurbishment) 耐震 (taishin - earthquake resistance) 設計 (sekkei - design)

Advanced

再構築 (saikouchiku - restructuring/reconstruction of systems) 式年遷宮 (shikinen sengu - periodic shrine rebuilding) 建築基準法 (kenchiku kijun hou - Building Standards Act) リノベーション (rinobēshon - renovation)

Grammar to Know

Suru-verbs (Noun + する)

改築する (to reconstruct)

Passive Voice (～される)

家が改築される (The house is reconstructed)

Noun + 済み (Already ~ed)

改築済み (Already reconstructed)

Compound Nouns (Noun + Noun)

改築工事 (Reconstruction work)

～に伴って (Accompanying ~)

改築に伴って、仮住まいを探す (Find temporary housing accompanying the reconstruction)

Examples by Level

古い家を改築します。

I will reconstruct the old house.

Simple noun + suru verb structure.

この駅は改築中です。

This station is under reconstruction.

Noun + chuu (during/under).

学校の改築はいつですか？

When is the school's reconstruction?

Possessive particle 'no' linking two nouns.

きれいな改築ですね。

It's a beautiful reconstruction, isn't it?

Using 'kaichiku' as a noun with an adjective.

改築のお金は高いです。

The money for reconstruction is expensive.

Subject + wa + adjective.

私の家を改築したいです。

I want to reconstruct my house.

Verb stem + tai (want to).

父は古い家を改築しました。

My father reconstructed an old house.

Past tense 'shimashita'.

改築のあとで、カフェを開きます。

After the reconstruction, I will open a cafe.

Noun + no ato de (after).

古いアパートを改築して、きれいにしました。

We reconstructed the old apartment and made it clean/pretty.

Te-form for connecting actions.

改築には、たくさんのお金がかかります。

Reconstruction costs a lot of money.

Ni wa (for the purpose of) + kakarimasu (costs).

去年の地震で壊れた家を改築しました。

I reconstructed the house that was broken by last year's earthquake.

Relative clause describing the house.

駅が改築されるので、不便になります。

Because the station is being reconstructed, it will become inconvenient.

Passive voice 'sareru' + 'node' (because).

改築工事の音がうるさいです。

The sound of the reconstruction work is noisy.

Compound noun 'kaichiku kouji'.

古い建物を改築するのは大変です。

Reconstructing an old building is difficult.

Nominalizing the verb with 'no'.

この神社は、二十年ごとに改築されます。

This shrine is reconstructed every twenty years.

Passive voice + frequency 'goto ni'.

来月、キッチンの改築を始めます。

Next month, I will start the reconstruction of the kitchen.

Object + o + hajimemasu (start).

祖父母の家を二世帯住宅に改築することにしました。

We decided to reconstruct my grandparents' house into a two-generation home.

Ni (into) + koto ni shimashita (decided to).

この建物は、耐震補強のために改築が必要です。

This building needs reconstruction for seismic reinforcement.

Tame ni (for the purpose of) + ga hitsuyou (is necessary).

改築費用が予想以上に高くなってしまいました。

The reconstruction costs ended up being higher than expected.

Noun + ga + adjective-ku naru (become).

歴史的な建物を改築する際は、許可が必要です。

When reconstructing historical buildings, permission is required.

Sai wa (at the time of/when).

改築によって、部屋がもっと明るくなりました。

Due to the reconstruction, the room became much brighter.

Ni yotte (due to/by means of).

古い蔵を改築して、ギャラリーとして使っています。

I reconstructed an old storehouse and am using it as a gallery.

Te-form + to shite (as/in the capacity of).

改築工事の間、私たちは仮住まいに引っ越します。

During the reconstruction work, we will move to temporary housing.

No aida (during).

この設計図通りに改築を進めてください。

Please proceed with the reconstruction according to this blueprint.

Doori ni (according to).

自治体は、老朽化した市民ホールの改築を計画しています。

The local government is planning the reconstruction of the aging civic hall.

Complex noun phrases acting as objects.

改築か新築か、どちらが経済的か検討する必要があります。

We need to consider whether reconstruction or new construction is more economical.

Ka... ka (whether... or) + kento suru (consider/examine).

この物件は改築済みなので、すぐに住むことができます。

Since this property has already been reconstructed, you can move in immediately.

Noun-zumi (already done) + node (because).

改築にあたって、近隣住民への説明会が行われました。

In preparation for the reconstruction, an explanatory meeting for local residents was held.

Ni atatte (upon/at the time of/in preparation for).

法律の改正により、改築の基準が厳しくなりました。

Due to the revision of the law, the standards for reconstruction have become stricter.

Ni yori (due to) + kijun (standards).

建物の構造を維持したまま、内部を全面的に改築しました。

While maintaining the building's structure, the interior was completely reconstructed.

Mama (remaining in a state) + zenmenteki ni (completely).

改築の規模によっては、建築確認申請が必要です。

Depending on the scale of the reconstruction, a building confirmation application is required.

Ni yotte wa (depending on).

伝統的な景観を守るため、改築には厳しい制限があります。

To protect the traditional landscape, there are strict restrictions on reconstruction.

Tame (to/for the purpose of) + seigen (restrictions).

都市再開発の一環として、主要な駅舎の改築が急ピッチで進められています。

As part of urban redevelopment, the reconstruction of major station buildings is progressing at a rapid pace.

No ikkan to shite (as part of) + kyuu-picchi (rapid pace).

その歴史的建造物は、忠実な改築によって往時の姿を取り戻した。

The historical structure regained its former appearance through faithful reconstruction.

Ni yotte (through) + ouji no sugata (former appearance).

改築に伴う仮店舗の運営は、予想以上に困難を極めた。

The operation of a temporary shop accompanying the reconstruction was extremely difficult beyond expectations.

Ni tomonau (accompanying) + konnan o kiwameta (reached the height of difficulty).

サステナビリティの観点から、解体よりも改築を選択する企業が増えている。

From the perspective of sustainability, an increasing number of companies are choosing reconstruction over demolition.

Kanten kara (from the perspective of).

改築案の策定には、住民の意向を十分に反映させる必要がある。

In the formulation of the reconstruction plan, it is necessary to sufficiently reflect the intentions of the residents.

Sakutei (formulation) + han'ei saseru (to reflect/cause to reflect).

建築基準法に抵触しないよう、改築計画を慎重に練り直した。

The reconstruction plan was carefully reworked so as not to conflict with the Building Standards Act.

Teishoku shinai you (so as not to conflict).

改築によって付加価値を高め、物件の競争力を強化する。

Increase the added value through reconstruction and strengthen the property's competitiveness.

Fuka kachi (added value) + kyouka suru (strengthen).

劇場の改築は、音響効果の向上を最優先事項として進められた。

The reconstruction of the theater was carried out with the improvement of acoustic effects as the top priority.

To shite (as) + susumerareta (was advanced/carried out).

伊勢神宮の式年遷宮は、単なる改築を超えた、精神文化の継承の儀式である。

The Shikinen Sengu of Ise Grand Shrine is a ritual of spiritual cultural inheritance that goes beyond simple reconstruction.

O koeta (transcending/beyond) + keishou (inheritance).

老朽化したインフラの改築は、国家の強靭化を図る上で避けては通れない課題だ。

The reconstruction of aging infrastructure is an unavoidable challenge in striving for national resilience.

Hakaru ue de (in the process of aiming for) + sakete wa toorenai (unavoidable).

改築のプロセスにおいて、伝統的な職人技と最新のテクノロジーの融合が試みられた。

In the process of reconstruction, a fusion of traditional craftsmanship and the latest technology was attempted.

Yuugou (fusion) + kokoromirareta (was attempted).

都市計画における改築の制限は、しばしば私有財産権との緊張関係を生じさせる。

Restrictions on reconstruction in urban planning often create a state of tension with private property rights.

Kincho kankei (state of tension) + shoujisaseru (to cause to arise).

改築に際して、土壌汚染の有無を調査することが法的に義務付けられている。

Upon reconstruction, investigating the presence or absence of soil contamination is legally mandated.

Ni saishite (at the time of) + gimuzukerarete iru (is mandated).

歴史的文脈を無視した改築は、地域のアイデンティティを損なう恐れがある。

Reconstruction that ignores the historical context risks damaging the identity of the region.

Sokonau osore ga aru (there is a risk of damaging).

改築工事の長期化は、周辺店舗の営業利益に甚大な影響を及ぼしかねない。

The prolongation of reconstruction work could potentially exert a massive impact on the operating profits of surrounding shops.

Choukika (prolongation) + oyoboshikanenai (might exert - negative).

改築による空間の再定義は、人々のライフスタイルに変容を迫るものである。

The redefinition of space through reconstruction is something that forces a transformation in people's lifestyles.

Sai teigi (redefinition) + hen'you o semaru (to force transformation).

Common Collocations

改築工事

改築費用

改築計画

全面的に改築する

改築済み

大規模な改築

改築願

改築許可

一部改築

改築期間

Common Phrases

家を改築する

— To reconstruct one's house. This is the most basic usage.

来年、家を改築する予定です。

改築工事中

— Under reconstruction work. Often seen on signs.

ただいま、改築工事中です。

古い家を改築する

— To reconstruct an old house. A very common combination.

古い家を改築してカフェにした。

駅の改築

— Reconstruction of a station. Common in public announcements.

駅の改築で出口が変わった。

改築の見積もり

— An estimate for reconstruction costs.

業者に改築の見積もりを頼んだ。

改築が必要だ

— Reconstruction is necessary. Used for aging buildings.

このアパートは改築が必要だ。

改築を検討する

— To consider reconstruction.

将来の改築を検討している。

改築が進む

— Reconstruction is progressing.

図書館の改築が順調に進んでいる。

改築の許可を得る

— To obtain permission for reconstruction.

ようやく改築の許可を得た。

改築を祝う

— To celebrate the completion of reconstruction.

友人の家の改築を祝った。

Often Confused With

改築 vs 改装 (kaisō)

Kaisō is for 'outfitting' or interior design. Kaichiku is for structural rebuilding.

改築 vs 増築 (zōchiku)

Zōchiku is adding space (extension). Kaichiku is rebuilding within the same space.

改築 vs 新築 (shinchiku)

Shinchiku is a brand new building from scratch. Kaichiku is rebuilding an existing one.

Idioms & Expressions

"骨組みから改築する"

— To reconstruct from the framework/bones. Implies a very thorough structural rebuild.

その古い民家を骨組みから改築した。

Technical/Descriptive

"改築に改築を重ねる"

— To reconstruct repeatedly. Implies a building has been changed many times over many years.

この旅館は改築に改築を重ねて今の形になった。

Neutral

"装いも新たに改築する"

— To reconstruct with a fresh new look. A poetic or marketing-style phrase.

老舗ホテルが装いも新たに改築された。

Formal/Marketing

"改築の槌音が響く"

— The sound of reconstruction hammers echoing. Used to describe a lively construction site.

震災後の街に改築の槌音が響いている。

Literary

"改築の手を休めない"

— Not stopping the reconstruction work. Implies continuous effort.

工期が短いため、改築の手を休めない。

Descriptive

"改築の余地がない"

— No room/possibility for reconstruction. Usually means it's better to tear it down.

このボロボロの小屋は改築の余地がない。

Neutral

"改築に踏み切る"

— To take the plunge and decide to reconstruct. Implies a big decision.

ついに実家の改築に踏み切った。

Neutral

"改築の目処が立つ"

— To see the light at the end of the tunnel for reconstruction.

ようやく改築の目処が立った。

Neutral

"改築に精を出す"

— To work hard on reconstruction.

彼は週末、自宅の改築に精を出している。

Neutral

"改築を急ぐ"

— To hurry the reconstruction.

冬が来る前に改築を急ぐ。

Neutral

Easily Confused

改築 vs 改修 (kaishū)

Both mean fixing or improving a building.

Kaishū is more about 'repairing/improving' to extend life (like a bridge), while Kaichiku is specifically 'reconstructing' the building structure.

橋の改修 (Bridge repair) vs 家の改築 (House reconstruction).

改築 vs 修復 (shūfuku)

Both involve working on old buildings.

Shūfuku aims for historical accuracy (restoration). Kaichiku can include modernizing and changing the design significantly.

お寺の修復 (Restoring a temple) vs お寺の改築 (Reconstructing a temple).

改築 vs リフォーム (rifōmu)

In English, 'renovation' covers both.

Rifōmu is cosmetic (wallpaper, kitchen). Kaichiku is structural (beams, foundations).

壁のリフォーム (Wall renovation) vs 骨組みの改築 (Framework reconstruction).

改築 vs 再建 (saiken)

Both involve building again.

Saiken is used after total destruction (fire/war). Kaichiku is used when the building still exists but needs rebuilding.

焼失した城の再建 (Rebuilding a burnt castle) vs 古い家の改築 (Reconstructing an old house).

改築 vs 改善 (kaizen)

Both start with 'kai' (change).

Kaizen is for 'improvement' of processes or skills. Kaichiku is only for buildings.

業務の改善 (Process improvement) vs 事務所の改築 (Office reconstruction).

Sentence Patterns

[Building] を改築しました。

古い家を改築しました。

[Building] は改築中です。

駅は今、改築中です。

[Purpose] のために改築する。

地震のために家を改築する。

[Building] が改築される予定だ。

図書館が改築される予定だ。

改築によって [Result]。

改築によって、部屋が広くなった。

改築に際して、[Action/Requirement]。

改築に際して、近隣の許可を得る。

改築を余儀なくされる。

老朽化で改築を余儀なくされた (Was forced to reconstruct).

改築の是非を問う。

歴史的建造物の改築の是非を問う (Question the pros and cons of reconstruction).

Word Family

Nouns

改築 (kaichiku - reconstruction)

築造 (chikuzou - construction)

建築 (kenchiku - architecture)

新築 (shinchiku - new construction)

Verbs

改築する (kaichiku suru - to reconstruct)

築く (kizuku - to build/amass)

改める (aratameru - to renew/reform)

Adjectives

改築された (kaichiku sareta - reconstructed)

築古の (chikufuru no - old construction/aged)

設計 (sekkei - design)

大工 (daiku - carpenter)

業者 (gyousha - contractor)

リフォーム (rifōmu - renovation)

耐震 (taishin - earthquake resistance)

How to Use It

frequency

Common in news, real estate, and professional discussions, but less frequent in very casual daily chatter.

Common Mistakes

Using 'kaichiku' for fixing a broken chair. → 修理 (shuuri)
Kaichiku is only for buildings. For small objects, use shuuri.
Using 'kaichiku' to mean adding a new room. → 増築 (zōchiku)
Adding space is zōchiku. Kaichiku is rebuilding what already exists.
Saying 'kaichiku' for painting a room. → 改装 (kaisō) or リフォーム
Painting is cosmetic. Kaichiku is structural reconstruction.
Using 'kaichiku' for a software update. → 更新 (koushin) or アップデート
Kaichiku is physical construction only. It cannot be used for digital items.
Confusing 'shinchiku' and 'kaichiku'. → Check if it's new or rebuilt.
Shinchiku is brand new (first time). Kaichiku is rebuilding something old.

Tips

Kanji Breakdown

Remember: 改 (Renew) + 築 (Build). If you are renewing the building, it's kaichiku. This helps you separate it from kaisou (Renew + Outfit/Decor).

Ise Shrine Connection

Think of the Ise Shrine. It's the ultimate example of kaichiku. Every 20 years, they rebuild it. This 'cycle of renewal' is the heart of the word.

The 'Suru' Power

Don't forget it's a suru-verb. You don't 'do' a kaichiku (kaichiku o suru), you just 'kaichiku-suru' the house. It's more direct.

Station Signs

Look for this word at train stations. If you see 改築, expect a detour or a new, shiny ticket gate soon!

Footprint Rule

If the house stays the same size but gets rebuilt, it's kaichiku. If it gets bigger, it's zōchiku. This distinction is vital for N2/N1 exams.

Chiku-Chiku Sound

Imagine the sound of building: 'Chiku-Chiku'. Kai-Chiku. You are changing (kai) the building with that sound.

Use with 'Kouji'

In professional settings, always use 'kaichiku kouji' (reconstruction work) to sound more like an expert.

The Bamboo Top

When writing 築, the bamboo radical (⺮) is key. Ancient Japanese buildings were bamboo and wood. This visual link helps memory.

Neighbor Courtesy

If you hear a neighbor say they are doing 'kaichiku', it's a big deal. Congratulate them with 'Omedetou gozaimasu' when it's finished.

Avoid for Apps

Never use kaichiku for updating an app. Use 'appudēto' or 'koushin'. Kaichiku is strictly for physical bricks, wood, and mortar.

Memorize It

Mnemonic

Think of 'KAI' (like 'kaizen' - improvement) + 'CHIKU' (the sound of a hammer hitting a nail: chik-chik). You are 'Improving' by 'Building' (Chiku)!

Visual Association

Imagine an old wooden house where the old, rotten beams are being pulled out and replaced with strong, new golden beams. That transformation is 'kaichiku'.

Word Web

Architecture Rebuilding Renovation Structure Home Safety Design History

Challenge

Try to find a building in your neighborhood that looks like it is being rebuilt. Say to yourself: 'Ano tatemono wa kaichiku-chuu desu' (That building is under reconstruction).

Word Origin

Sino-Japanese (Kango). It combines '改' (kai) and '築' (chiku). '改' originally depicted a hand hitting a person to make them correct themselves, evolving to mean 'reform' or 'change.' '築' depicts wood and soil being pounded down to build a foundation.

Original meaning: To rebuild or renew a structure from its foundation.

Japonic (Sino-Japanese vocabulary).

Cultural Context

When neighbors are doing 'kaichiku', it is polite to acknowledge the noise. If you are doing it, giving small gifts to neighbors beforehand is a common Japanese custom.

In English, we use 'renovate' for almost everything. In Japan, being specific about 'kaichiku' shows you understand the structural depth of the work.

Ise Grand Shrine (Shikinen Sengu) TV show: 'Before After' (劇的ビフォーアフター) Himeji Castle major renovations

Practice in Real Life

Real-World Contexts

Real Estate

改築済み物件 (reconstructed property)
改築の相談 (consultation for reconstruction)
築年数と改築 (building age and reconstruction)
資産価値の向上 (improving asset value)

Public Infrastructure

駅舎の改築 (station building reconstruction)
校舎の改築 (school building reconstruction)
バリアフリー改築 (barrier-free reconstruction)
改築工事のお知らせ (notice of reconstruction work)

Home Improvement

キッチンの改築 (kitchen reconstruction)
二世帯住宅への改築 (reconstruction into a two-generation home)
改築の見積もり (reconstruction estimate)
改築ローン (reconstruction loan)

Historical Preservation

古民家の改築 (reconstruction of old folk houses)
伝統的な改築手法 (traditional reconstruction methods)
景観保護と改築 (landscape protection and reconstruction)
文化財の改築 (reconstruction of cultural assets)

Safety & Disaster Prevention

耐震改築 (earthquake-resistant reconstruction)
老朽化による改築 (reconstruction due to aging)
被災地の改築 (reconstruction in disaster-hit areas)
安全基準を満たす改築 (reconstruction meeting safety standards)

Conversation Starters

"「家を改築するとしたら、どこを一番変えたいですか？」 (If you were to reconstruct your house, what part would you want to change the most?)"

"「最近、この近くで改築工事が多いと思いませんか？」 (Don't you think there's a lot of reconstruction work around here lately?)"

"「古い家を改築してカフェにするのは、とても素敵だと思います。」 (I think reconstructing an old house into a cafe is very wonderful.)"

"「改築費用って、新築と同じくらいかかることもあるそうですよ。」 (I heard that reconstruction costs can sometimes be as much as new construction.)"

"「歴史的な建物を改築する時、何が一番大切だと思いますか？」 (What do you think is most important when reconstructing a historical building?)"

Journal Prompts

もし自分の家を自由に改築できるなら、どんなデザインにしますか？具体的に書いてみてください。 (If you could freely reconstruct your house, what design would you choose? Please write specifically.)

あなたの街で最近改築された建物はありますか？その変化についてどう思いますか？ (Is there a building in your town that was recently reconstructed? What do you think about that change?)

「古いものを壊して新しく作る」ことと「古いものを改築して残す」こと、どちらが好きですか？ (Do you prefer 'destroying the old and making something new' or 'reconstructing the old and keeping it'?)

日本の伝統的な「改築」の文化について調べたことをまとめてみましょう。 (Summarize what you researched about Japan's traditional culture of 'kaichiku'.)

改築工事の音や不便さについて、近所の人に送る丁寧な手紙を書いてみてください。 (Try writing a polite letter to your neighbors about the noise and inconvenience of reconstruction work.)

Frequently Asked Questions

10 questions

No, 'kaichiku' is strictly for buildings. For a computer or a system, you should use 'saikouchiku' (restructuring) or 'kaizen' (improvement).

'Tate-kae' is a more general term for demolishing and building a new house on the same spot. 'Kaichiku' is a more formal, technical term often used in legal or professional contexts.

Yes, generally 'kaichiku' is very expensive because it involves structural work. In some cases, it can cost as much as building a new house (shinchiku).

Yes, for significant 'kaichiku' work, you usually need to file a 'kenchiku kakunin shinsei' (building confirmation application) with the local government.

It is 'wasei-eigo' (Japanese-made English). It is used very commonly for light renovation, but 'kaichiku' is the proper Japanese word for structural work.

You can say 'kaichiku-chuu' (改築中). You will often see this on signs near construction sites.

Adding a floor is technically 'zōchiku' (extension) because it increases the floor area. 'Kaichiku' is specifically for rebuilding within the existing area.

It means 'large-scale reconstruction.' It is used for major projects like rebuilding a whole school or a large apartment complex.

Shrines are made of wood and naturally decay. 'Kaichiku' or 'sengu' is a way to keep the shrine spiritually 'new' and physically safe.

Yes, you will see it in 'kenchiku' (architecture) and 'shinchiku' (new build). It is a very important kanji for anything related to building.