Can inherited land be sold if it is in a 'fill-regulation area'? The 2023 regulation and the steps to a sale

The key point: Even if inherited land is in a "fill-regulation area," you can sell the land itself. What the Fill Regulation Act makes subject to permission is construction work—fills, cuts and the like above a certain scale within the area—not transferring ownership (the sale). What affects price and saleability is whether the buyer needs permission to do construction or rebuild there, and whether the existing fill or retaining wall is safe. We handle the check of whether it is in an area, the important-matters explanation, and the brokerage; the permit/notification application goes to an administrative scrivener, safety assessment and design of retaining walls and fills to an architect or civil-engineering specialist, capital-gains and inheritance tax to a tax accountant, inheritance registration to a judicial scrivener, and disputes over boundaries or contracts to a lawyer—each an independent business, contracted with separately.

For heirs who have inherited sloped or graded land and are considering a sale, this article organises "does being in a fill-regulation area mean it can't be sold" and "what to check first," in the order of the Act on Regulation of Residential Land Development and Specified Embankments (the Fill Regulation Act) and the Real Estate Brokerage Act. This is general information; the judgment of whether an existing fill or retaining wall is safe and the final judgment on whether permission is needed rest with an architect, a civil-engineering specialist, or the relevant prefecture.

Yotsuba Real Estate Co., Ltd. (四葉不動産株式会社), based in Bunkyo, Tokyo, provides appraisal of inherited real estate and sale brokerage. For land that may fall within a fill-regulation area, you can consult us from what can be confirmed before selling.

What is the Fill Regulation Act, and what changed and when?

The Fill Regulation Act (Act on Regulation of Residential Land Development and Specified Embankments) thoroughly revised the former Act on Regulation of Residential Land Development by Act No. 55 of 2022 and came into force on 26 May 2023. The aim is to regulate dangerous fills under a nationwide uniform standard regardless of the land's use or purpose. As a result, not only residential land development but also fills onto farmland or forest, and the stockpiling of earth and stones, came within the regulation.

There are two kinds of regulation area.

Area	What kind of land	Permission for work
Residential-land-development, etc. work regulation area	Built-up areas or settlements and the like, where a fill would endanger houses, etc.	Work above a certain scale needs permission of the prefectural governor, etc. (Act art. 12 (1))
Specified-embankment, etc. regulation area	Away from built-up areas, but where terrain etc. means a fill could collapse and endanger houses, etc.	Work above a certain scale needs permission of the prefectural governor, etc. (Act art. 30 (1))

Separately, there is also a scheme to designate land already graded, where the risk of disaster is large, as a "graded-land disaster-prevention area" (Act art. 45). In all cases the areas are designated by the prefectural governor, etc., and the progress of designation differs by region. The important point is that these regulations attach to "construction work," and do not prohibit the sale of the land itself.

How do you find out whether your inherited land is in a regulation area?

Whether it is within an area is checked first in the public information of the prefecture (or designated/core city, etc.) that designates the area. Many municipalities publish the designation and make it viewable on a web map or at a counter.

How to check	Content
Municipal published map / counter	Check the area at the prefecture's fill-regulation section (erosion control, residential-land disaster prevention, development guidance, etc.)
Whether notified	Area designation takes effect by notification; check the date and extent
Graded-land disaster-prevention area	Check whether it is separately designated (targets existing graded land)
Condition on site	Check on site for past fills/cuts, retaining walls, cliffs, spring water, etc.

Area designation is being carried out progressively by each prefecture, etc., and designation may differ even within the same city. For land about which we receive a sale inquiry, we check the likelihood of the area applying from the municipality's public information and connect it to the survey toward the important-matters explanation. The final judgment on the area rests with the relevant municipality (we confirm based on the public information as of 23 October 2026).

Can land with an existing fill or retaining wall be sold, and who judges its safety?

Land with an existing fill or retaining wall can be sold. But if the buyer newly rebuilds or grades, work above a certain scale within an area needs permission, and whether the existing retaining wall conforms to current standards becomes an issue. An old retaining wall (two-tier walls, aged interlocking blocks, unknown structure, etc.) ties directly to the buyer's funding plan and the cost of demolition and rebuilding.

Axis	Who judges
Structure, deterioration, legality of the existing retaining wall	Architect / civil-engineering specialist (survey, assessment, design)
Whether work within the area needs permission	The relevant prefecture, etc. (permit review)
Effect on the land's price	Real-estate transaction business (us; appraisal, brokerage)

We cannot assert "this retaining wall is safe." Assessing safety and designing a rebuild are the field of an architect or civil-engineering specialist; we organise the condition (presence of a retaining wall, past grading, whether it is cliff land) and reflect it in the sale steps. The thinking on selling land with a cliff or retaining wall is in What to check before selling land with a cliff or retaining wall (Japanese), and selling land where a soil survey is involved in Selling land where soil contamination is suspected, such as a former factory or warehouse site (Japanese).

How is the Fill Regulation Act explained in the important-matters explanation?

When a real-estate broker brokers a sale, it explains the restrictions under laws and regulations to the buyer in the important-matters explanation under article 35 of the Real Estate Brokerage Act. Whether land falls within the Fill Regulation Act's residential-land-development work regulation area, specified-embankment regulation area, or graded-land disaster-prevention area is subject to explanation as a "restriction under laws and regulations" set out in article 3 of that Act's Enforcement Order.

What is explained	Point
Whether it falls within an area	Whether it is in the work regulation area, specified-embankment regulation area, or graded-land disaster-prevention area
Restrictions within the area	That work above a certain scale needs permission (affects the buyer's rebuilding/grading)
Existing fill / retaining wall	Explain to the extent ascertainable as the condition; the safety judgment is a specialist's field

Even if it is within an area, a sale forms if that fact is correctly surveyed and explained. Rather, neglecting the explanation risks later claims of non-conformity or breach of the explanation duty. We reflect the area-check result accurately in the important-matters explanation and explain, including the possibility that the buyer needs permission for rebuilding or grading. Whether permission is actually granted and which work is subject to permission are individual judgments in the field of the relevant municipality and the administrative scrivener who handles the application.

Have a question about your situation?

Tell us about your property search or plans to sell.

Chat on LINEContact us

Who do you ask for the permit application, tax, and registration? (Separate mandates)

Selling inherited land in a fill-regulation area spans different businesses: real estate, licensing, construction, tax, registration, and disputes. Getting the order wrong can lead to putting it on the market without the safety assessment, or looking for a buyer before the inheritance registration is done.

Role	Who handles it
Area check, appraisal, important-matters explanation, sale brokerage and settlement	Real-estate transaction business (our company)
Application for permits/notifications under the Fill Regulation Act	Administrative scrivener
Safety assessment of the existing retaining wall/fill; rebuild design	Architect / civil-engineering specialist
Inheritance registration; registration such as a change of building description	Judicial scrivener
Calculating and filing capital-gains tax and inheritance tax	Tax accountant
Disputes over boundaries or contracts, or among heirs	Lawyer

Preparing the application documents for permits/notifications under the Fill Regulation Act is the work of an administrative scrivener; we do not act as agent. Judging and designing whether an existing retaining wall or fill is safe is handled by an architect or civil-engineering specialist.

These are each independent businesses, and you contract with them separately. We handle the area check and the sale brokerage; the permit/notification application goes to an administrative scrivener, safety assessment and design to an architect or civil-engineering specialist, inheritance registration to a judicial scrivener, capital-gains and inheritance tax to a tax accountant, and disputes to a lawyer. We neither receive nor pay referral or introduction fees.

How can you consult Yotsuba Real Estate about selling inherited land in a fill-regulation area?

Those who have inherited sloped or graded land and want to sell land that may be in a fill-regulation area can contact Yotsuba Real Estate directly to request appraisal and sale brokerage. Please first tell us:

• The location of the land to sell and the current state of the registered title (whether the inheritance registration is done)
• Whether it is sloped/graded land, and whether there is an existing fill, retaining wall, or cliff
• What is known about the history of past grading or rebuilding
• The number of heirs and the state of the estate division

Yotsuba Real Estate checks the likelihood of the area applying from the municipality's public information and tells you what can be confirmed before selling. The permit/notification application goes to an administrative scrivener, retaining-wall/fill safety assessment to an architect or civil-engineering specialist, inheritance registration to a judicial scrivener, tax to a tax accountant, and disputes to a lawyer—each independent businesses that you contract with separately.

Consult Yotsuba Real Estate about selling inherited land that may be in a fill-regulation area—initial consultation is free

For the thinking on selling inherited land that is in an urbanisation-control area, see also Can inherited land in an urbanisation-control area be sold? (Japanese). In your message, write "sale of inherited land in a fill-regulation area" and include the location and condition of the land. Without presuming whether it can be sold, we begin with the area check and organising who to refer each part to.

Frequently asked questions

Q. If my inherited land is in a fill-regulation area, can it no longer be sold?
A. It can be sold. What the Fill Regulation Act makes subject to permission is construction work—fills, cuts and the like above a certain scale within the area—not the sale of the land itself (Act arts. 12 (1) and 30 (1)). What affects price and saleability is whether the buyer needs permission for rebuilding/grading and whether the existing retaining wall is safe. We survey whether the area applies and reflect it in the important-matters explanation.

Q. Where can I find out whether land is in a fill-regulation area?
A. The prefectural governor, etc. designates the area, and it is usually viewable on a web map or at a counter together with the notification. You can check at the fill-regulation section (erosion control, residential-land disaster prevention, development guidance, etc.). For land about which we receive a sale inquiry, we also check the likelihood of the area applying from the municipality's public information. The final judgment on the area rests with the relevant municipality.

Q. The land has an old retaining wall. Can a real-estate company judge whether it is safe?
A. No. Judging whether a retaining wall or fill is safe, its conformity with current standards, and designing a rebuild are the field of an architect or civil-engineering specialist. We organise the condition (presence of a retaining wall, past grading, whether it is cliff land) and reflect it in the sale, and connect you to a specialist for the safety assessment. Whether the buyer needs permission when doing work is the field of the relevant municipality and the administrative scrivener.

Q. How is land in a fill-regulation area treated in the important-matters explanation?
A. Whether land falls within a Fill Regulation Act area is subject to the important-matters explanation as a "restriction under laws and regulations" under Real Estate Brokerage Act art. 35 and art. 3 of that Act's Enforcement Order. Even if it is within an area, a sale forms if it is correctly surveyed and explained. Because neglecting the explanation risks later liability, we reflect the area-check result accurately and explain it.

Sources

The following public materials are starting points for investigation. Laws are amended, so check the current text, enforcement date and latest amendment on e-Gov Law Search. The status of area designation differs by prefecture, etc. All were consulted on 23 October 2026. They do not establish whether an individual parcel is in a regulation area or whether permission is needed. The sources below are in Japanese.

• e-Gov Law Search: Act on Regulation of Residential Land Development and Specified Embankments (Fill Regulation Act) (Act No. 191 of 1961; full revision by Act No. 55 of 2022, in force 26 May 2023; art. 12 (1) = permission for work in the residential-land-development work regulation area, art. 30 (1) = permission for work in the specified-embankment regulation area, art. 45 = graded-land disaster-prevention area)
• e-Gov Law Search: Real Estate Brokerage Act (Act No. 176 of 1952; art. 35 = explanation of important matters; the duty to explain restrictions under laws and regulations to the buyer)
• e-Gov Law Search: Real Estate Brokerage Act Enforcement Order (Cabinet Order No. 383 of 1964; art. 3 lists Fill Regulation Act matters among the restrictions under laws and regulations subject to the important-matters explanation)
• Ministry of Land, Infrastructure, Transport and Tourism, "Fill Regulation Act" explanatory page: the concept of regulation areas and the outline of the permit system (consulted 23 October 2026); check the status of area designation in each prefecture's public information

This article provides general information and does not guarantee the feasibility of an individual sale, whether permission is needed, or the safety of an existing fill or retaining wall. Whether the area applies is judged by the relevant prefecture, etc.; the safety of a retaining wall or fill by an architect or civil-engineering specialist; and whether permission is needed by the relevant municipality and an administrative scrivener.

Joji Uramatsu (浦松 丈二), Representative Director and licensed real estate transaction specialist, Yotsuba Real Estate Co., Ltd. (四葉不動産株式会社). We provide appraisal of inherited real estate and sale brokerage. Author profile

Updated: 23 October 2026