Our Services
Kouken Kogyo is engaged in a wide variety of businesses.
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01
Interior Strip-Out (Shell and Core)
All partitions, columns, ceilings, floors, and other artificially attached non-structural elements are removed, leaving the interior empty. All electrical wiring, exhaust ducts, air conditioners, and other related equipment are also removed, leaving only the interior space, which in the case of a reinforced concrete building is left as bare concrete. The major advantage of this project is that it can be completely renovated, including convenience and design aspects, and the construction work can be large-scale.
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02
Wooden Building Demolition
Steel-frame buildings use steel for structural members such as columns and beams. They are classified as heavy steel structures with steel at least 6 mm thick, or light steel structures with steel less than 6 mm thick. Heavy steel is mainly used for large buildings and high-rise apartments, while light steel is commonly used for houses and small shops. Typical demolition costs are approximately ¥30,000–¥40,000 per tsubo (about 3.3 m²), but vary considerably between heavy and light steel structures.
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03
Steel Frame Demolition
Steel-frame buildings use steel for structural members such as columns and beams. They are classified as heavy steel structures with steel at least 6 mm thick, or light steel structures with steel less than 6 mm thick. Heavy steel is mainly used for large buildings and high-rise apartments, while light steel is commonly used for houses and small shops. Typical demolition costs are approximately ¥30,000–¥40,000 per tsubo (about 3.3 m²), but vary considerably between heavy and light steel structures.
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04
Reinforced Concrete (RC) Demolition
Reinforced concrete construction is highly durable, fire-resistant, and strong, with steel and concrete compensating for each other’s weaknesses. This makes it very sturdy and hard to demolish, requiring special methods like the “crusher” or “large breaker,” leading to higher demolition costs than wood or steel structures. As demolition is a large-scale project, precautions must be taken to minimize noise, vibration, and dust affecting the surrounding area.
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05
Asbestos Removal
Before a building is demolished, it must be surveyed to determine whether asbestos is present. Removal work requires the notifications prescribed by law, protective equipment such as full-face dust masks, and disposable work clothing. Improper removal can release asbestos fibers and harm the health of owners, occupants, neighbors, and others. Take care to avoid contractors who do not comply with the applicable requirements.
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06
Property Reinstatement
Restoration work refers to removing renovated fixtures and fittings and returning the property to its original condition when vacating a leased property such as an office or a store. Although it depends on the content of the contract, in most cases, the contract stipulates that partitions and other facilities installed for the tenant’s convenience must be removed and returned to the lessor. First, it is necessary to confirm the contents of the lease agreement and discuss the scope of restoration work with the lessor.
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07
Parking Lot Removal and Construction
All non-structural partitions, columns, ceilings, floors, and other installed elements are removed, leaving the interior empty. Electrical wiring, exhaust ducts, air conditioners, and related equipment are also removed. In reinforced concrete buildings, this leaves the bare concrete structure. This enables a complete renovation of the layout, functionality, and design, and involves substantial work.
08Secondhand Goods Purchasing
We hold a secondhand goods dealer license and purchase valuable items left behind by occupants. Purchasing reusable items reduces the amount of waste and disposal costs. Demolition generates large amounts of waste, so supporting reuse and recycling also helps reduce waste output. We welcome requests from individuals, real estate businesses, demolition contractors, renovation companies, and estate clearance companies.
09Scrap and Recyclable Materials Purchasing
Metal waste and other waste may be sold for value. We strive to reduce waste by selling electric wires, aluminum, scrap iron, etc. generated during demolition as valuable resources and recycling them. By properly disposing of waste, we help our clients manage their waste, reduce disposal costs, and improve their corporate reputation. Please feel free to contact us if you want to dispose of scrap but do not have the means or time to transport it.