Selling an inherited factory or warehouse: who investigates soil contamination and asbestos, and how far?

In short: when you sell an inherited factory, warehouse or workshop, soil contamination and asbestos turn on "who investigates and how far." (1) For soil contamination, an investigation-and-report duty arises for the landowner when a designated facility using hazardous substances is discontinued (Soil Contamination Countermeasures Act, Article 3), and a change of form of land above a certain scale can also lead to investigation (Article 4). (2) For asbestos, where a survey record on a building exists, its content is a subject of the real-estate disclosure (Building Lots and Buildings Transaction Business Act, Article 35 and Enforcement Regulation Article 16-4-3), and for demolition/renovation the contractor must report a pre-survey (Air Pollution Control Act; from 1 April 2022). The investigation goes to a designated investigation body of the Ministry of the Environment, the inheritance registration to a judicial scrivener, capital-gains tax to a tax accountant, and post-contract disputes to a lawyer.

When you inherit a property that was a factory, warehouse or workshop and set about selling it, the worry that surfaces is "is soil contamination or asbestos a problem?" Unlike housing, land or buildings that may have handled hazardous substances add a layer of things to check before selling. This article sets out, from the provisions and public materials, how soil contamination and asbestos are treated from a real-estate transaction viewpoint, and how far the seller's duty to disclose extends — for an heir who wants to sell inherited business property. Assessing whether contamination exists, and measurement, go to an investigation body; the tax goes to a tax accountant.

When is a soil-contamination investigation required in selling a former factory or warehouse?

The main situations where an investigation is legally required are the two set by the Soil Contamination Countermeasures Act.

First, when a designated facility using hazardous substances (a facility that manufactures, uses or treats certain specified hazardous substances) is discontinued. Article 3 places on the owner of the land that was the site of that factory/works a duty to have a designated investigation body investigate the soil's condition and report the result to the prefectural governor (where the governor confirms, from the land's intended use, that there is no risk of harm to health, the investigation at that point is deferred).

Second, a change of form of land above a certain scale. Article 4 requires notification where the form of land of 3,000 m² or more (900 m² or more where contamination is suspected) is changed, and the governor may order an investigation if deemed necessary. Where the buyer rebuilds or grades after the sale and this scale is reached, it can lead to an investigation.

Even without a legal duty, in practice buyers and lenders often require a voluntary investigation (a Phase 1 history study of the land, and if needed a Phase 2 soil analysis), and on a possibly contaminated former factory/warehouse the presence of an investigation moves the price and the deal.

Situation	Basis	Investigation
Discontinuing a designated facility using hazardous substances	Soil Contamination Countermeasures Act, Art. 3	Duty on the landowner to investigate and report (deferral by confirmation)
Change of form of land of 3,000 m²+ (900 m²+ if contamination suspected)	Same, Art. 4	Notification → investigation if the governor orders
Buyer's/lender's request	Contract/finance practice	Voluntary (history study, soil analysis)

How to sell a former factory/warehouse site is in conditions for a property usable as a commercial warehouse; whether to demolish and sell as bare land or sell as-is is in should you demolish to bare land or sell with the old house.

On whom does the Article 3 investigation duty fall?

The Article 3 duty falls on the owner, manager or possessor of the land (the landowner, etc.) — the duty is directed at the land side, not the business operator that discontinued the facility. An heir who takes over a factory/warehouse site can become the party to this duty where the deceased had discontinued a designated facility using hazardous substances.

The actual soil is investigated by a designated investigation body designated by the Minister of the Environment or the prefectural governor — the owner does not measure it themselves, but has a designated body investigate and reports the result to the governor. Where the result does not meet the standard, the area is designated as an "area requiring action" or an "area requiring notification on a change of form," and the designation restricts use and change of form of the land. Whether such a designation exists bears on the legal restrictions to be explained to the buyer on sale.

Point	Content
Who bears the duty	Landowner, etc. (the land side, not the operator that discontinued)
Who investigates	Designated investigation body (designated by the Minister/governor)
Report to	Prefectural governor
Designated area	Area requiring action / requiring notification on change of form (use and change restricted)

Whether inherited land has an Article 3 history is traced through the deceased's business, the facility's notifications, and the discontinuation record. Whether an investigation is needed, and whether an area designation exists, are best confirmed at the counters of the designated investigation body and the prefecture.

How does an asbestos pre-survey result appear in the real-estate disclosure?

Asbestos is treated, in a real-estate transaction, in relation to the building. Article 35, paragraph 1 of the Building Lots and Buildings Transaction Business Act and Enforcement Regulation Article 16-4-3 provide that, as a subject of the disclosure, where the result of a survey of the presence or absence of asbestos in a building is recorded, its content must be explained. Note that this is a duty to explain the content where a survey record exists — it does not impose on the seller or agent a new duty to carry out an asbestos survey. The same provision also requires explaining the content of a seismic diagnosis where a building first constructed before 1 June 1981 has undergone one.

For demolition/renovation, a separate scheme operates. The Air Pollution Control Act, from 1 April 2022, placed on the prime contractor (or self-doing worker) a duty to report to the prefecture, etc. the result of a pre-survey of the presence of asbestos for demolition/renovation of buildings above a certain scale (electronic reporting via the asbestos pre-survey result reporting system; the report to the labour standards inspection office can be made at the same time). Where the buyer demolishes after the sale, this reporting duty falls on the construction side.

Situation	On whom	Content
Real-estate disclosure on sale	The agent	Where an asbestos survey is recorded, its content (Act Art. 35 / Reg. Art. 16-4-3; not a new survey duty)
Demolition/renovation	Prime contractor / self-doing worker	Above a certain scale, report the pre-survey to the prefecture, etc. and the labour office (Air Pollution Control Act; from 1 Apr 2022)

Soil contamination itself is not individually enumerated in the statutory disclosure items of Article 35, but facts the seller/agent knows can fall under the duty to disclose (Act Article 47) and post-sale non-conformity liability. Selling while hiding a known contamination or asbestos fact can bring liability later — this is common to both.

How are investigation and countermeasure costs deducted from the sale price?

For a property that may have soil contamination or asbestos, the investigation, removal and countermeasure costs become a bargaining point. In practice, one of the following is used, and which you choose changes the net proceeds:

• The seller investigates and remedies, then sells clean (costs come first, but it is easier to sell)
• Sell as-is, deducting the equivalent of investigation/countermeasure costs from the price (build in the buyer's burden)
• Adjust the scope of non-conformity liability by special clause, deciding how the risk is shared

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Where the seller is an individual, non-conformity liability can be reduced or excluded by special clause (but exclusion does not reach a fact the seller knew and did not disclose). Where the seller is a transaction business and the buyer an individual, Article 40 of the Act restricts, e.g., setting the notice period at two years or more from delivery. Disclosing a known contamination/asbestos fact and adjusting the price/clause accordingly is the basis for avoiding later disputes.

Way of selling	How costs arise	Suited to
Sell after investigation/countermeasure	Seller pays first	Wanting to hand over cleanly and quickly
As-is + price adjustment	Buyer's burden built in	Not wanting to pay first
Risk sharing by special clause	By negotiation	Where the extent is uncertain

A quote for countermeasure costs is for a specialist contractor; the tax treatment (whether it can be included in transfer expenses, etc.) is for a tax accountant. We handle the way of selling and price design; the costs and the tax are each looked at by their specialists.

How do you divide inheritance registration, investigation and tax among whom?

The view on the way of selling and the sale brokerage are undertaken by Yotsuba Real Estate Co., Ltd. (licensed real estate agent, Tokyo Governor (1) No. 113304). The roles divide as follows.

Order	What	Who
1	Inheritance registration (move the name from the deceased to the heir)	Judicial scrivener
2	Soil history study, soil analysis, area-designation check	Designated investigation body / prefecture
3	Asbestos survey/removal (incl. the pre-survey report on demolition/renovation)	Survey/demolition contractor
4	Way of selling (as-is/after countermeasure) and price design, brokerage	Licensed real estate agent (us)
5	Capital-gains tax (incl. treatment where the acquisition cost is unknown)	Tax accountant
6	Disputes with the buyer over non-conformity/contamination	Lawyer

Inheritance registration has been mandatory since 1 April 2024, so even on a premise of selling the name must be put in order first. For an old factory/warehouse whose acquisition cost is unknown, the capital-gains calculation can be harder than for housing, and the treatment of the acquisition cost and the special addition to the acquisition cost on inheritance are within a tax accountant's remit.

The soil-contamination investigation goes to a designated investigation body of the Ministry of the Environment, the inheritance registration to a judicial scrivener, capital-gains tax to a tax accountant, and disputes with the buyer to a lawyer — each engaged directly. These are independent business entities, engaged separately from us. We neither pay nor accept referral fees or introduction commissions. Consultation is free. The general approach to inherited property is at inheritance and vacant houses. For non-residential inherited property such as forest or wilderness, see can inherited forest or wilderness be sold.

Frequently asked questions

Q. Must I always do a soil-contamination investigation before selling an inherited factory site?
A. Not always. Article 3 of the Soil Contamination Countermeasures Act requires an investigation and report by the landowner when a designated facility using hazardous substances is discontinued, but where that does not apply, a legal duty does not immediately arise. However, buyers and lenders often require a history study or soil analysis, and on a possibly contaminated site the presence of an investigation moves the price and the deal. Confirm any area designation with the designated investigation body and the prefecture.

Q. Must the seller carry out the asbestos survey?
A. What the real-estate disclosure requires is to "explain the content where an asbestos survey result is recorded"; the Act does not oblige the seller to carry out a new asbestos survey itself. On the other hand, where the building is demolished or renovated after the sale, above a certain scale the contractor (prime contractor, etc.) has a duty to report the pre-survey result (Air Pollution Control Act; from 1 April 2022). Who investigates changes with the situation.

Q. What happens if I know of contamination or asbestos and sell without saying so?
A. Exclusion of non-conformity liability by special clause does not reach a fact the seller knew and did not disclose. A transaction business also has a duty to disclose (Act Article 47). Disclosing the known fact and adjusting the equivalent of investigation/countermeasure costs by price or clause is the basis for avoiding later disputes. A post-contract dispute is a lawyer's field.

Q. How is capital gains calculated for an old factory/warehouse whose acquisition cost is unknown?
A. The treatment where the acquisition cost is unknown or uncertain (a deemed acquisition cost, or the special addition to the acquisition cost on inheritance, etc.) is within a tax accountant's remit. Including whether investigation/countermeasure costs can be counted as transfer expenses, be sure to confirm the calculation and the applicability of any special measure with a tax accountant. We handle the way of selling and the price design.

Sources (primary)

• e-Gov "土壌汚染対策法" (Soil Contamination Countermeasures Act) — Act No. 53 of 2002. Art. 3 (investigation and report by the landowner on discontinuing a designated facility using hazardous substances; deferral by the governor's confirmation); Art. 4 (notification on changing the form of land of a certain scale (3,000 m²+, or 900 m²+ where contamination is suspected) and an order to investigate; designation of areas requiring action / requiring notification on change of form). Accessed 15 September 2026.
• e-Gov "宅地建物取引業法" (Building Lots and Buildings Transaction Business Act) — Art. 35(1) (disclosure of important matters), Art. 47 (duty to disclose important matters), Art. 40 (restriction on special clauses on warranty liability); Enforcement Regulation Art. 16-4-3 (where a survey of asbestos in a building is recorded, its content, and the content of a seismic diagnosis, are important matters). Accessed 15 September 2026.
• Ministry of the Environment / Ministry of Health, Labour and Welfare, "Asbestos pre-survey result reporting system" — under the Air Pollution Control Act, from 1 April 2022 the prime contractor / self-doing worker electronically reports the asbestos pre-survey result to the prefecture, etc. and the labour standards inspection office for demolition/renovation of buildings above a certain scale. Accessed 15 September 2026.

The need for a soil investigation or area designation, the need for an asbestos survey/report, and how a non-conformity exclusion clause works all vary by property and by party. This article does not assess any individual property. Confirm finally at the counters: the designated investigation body and the prefecture for soil contamination, an architect/contractor for building and demolition, a tax accountant for the tax, and a lawyer for disputes. The calculation of capital gains where the acquisition cost is unknown, and the special addition to the acquisition cost on inheritance, have detailed requirements; be sure to confirm applicability with a tax accountant. This article is general information; it does not judge or guarantee the presence of contamination, the sale price or the tax of any particular property. The view, price design and brokerage are undertaken by Yotsuba Real Estate Co., Ltd. (licensed real estate agent). The soil-contamination investigation goes to a designated investigation body, the inheritance registration to a judicial scrivener, capital-gains tax to a tax accountant, and disputes with the buyer to a lawyer — independent business entities, engaged separately and directly. We neither pay nor accept referral fees.

About the author

Joji Uramatsu — licensed real estate transaction specialist (Tokyo Governor registration No. 293544) and administrative scrivener (registration No. 25087022). Representative Director, Yotsuba Real Estate Co., Ltd. (licensed real estate agent, Tokyo Governor (1) No. 113304); principal, Yotsuba Administrative Scrivener Office. Kohinata, Bunkyo, Tokyo, about five minutes' walk from Myogadani station. Property and paperwork are put on the same table. Full profile: author page.