Restrictions by Building Standards Law

Updated: July 2025, 7

There are restrictions based on the Building Standards Act regarding matters that must be included in the important notes.

The items are wide-ranging, such as usage zone, building coverage ratio, floor area ratio, relationship between site and road, etc.

These are all important matters for the building.

Because these are important matters, we must investigate them with the utmost care.

Below, we have summarized the points to keep in mind when conducting an investigation, based on examples of properties we have handled.

Regarding the building coverage ratio relaxation requirements

Building coverage ratio refers to the limit of the ratio to the site area, and it differs depending on the area of ​​use.

Even within the same area, building coverage ratios often differ depending on the municipality.

Building coverage ratio is an important indicator that shows how much buildings can be built on the land.

If you are thinking of buying land and building a house now, consider what kind of building to build based on this building coverage ratio.

I think I'll consider it.

Wouldn't it be better to have a higher building coverage ratio if possible?

This is because the higher the building coverage ratio, the more buildings can be built on the land.

Therefore, it is better to know about measures to ease the building coverage ratio.

Here, we will discuss mitigation measures for fireproof buildings, which are the most popular.

We will explain mitigation measures based on corner lot mitigation using an example from our company.

・Fireproof buildings

First, the Building Standards Act includes restrictions to prevent the spread of fire in the event of a fire in an urban area.

There are fire prevention areas and semi-fire prevention areas.

When constructing a fireproof building within a fire prevention area or semi-fire prevention area,There will be no restrictions on building coverage ratio in the following areas.

• Class 80 residential area (area with a building coverage ratio of XNUMX%)
• Type 80 residential area (area with building coverage ratio of XNUMX%)
• Semi-residential area (area with building coverage ratio of 80%)
• Neighboring commercial area (area with building coverage ratio of 80%)
• Commercial area (area with building coverage ratio of 80%)
• Semi-industrial area (area with building coverage ratio of 80%)

If the building coverage ratio is not 80% or the property is in a different zone, an additional 10% will be added.

If these mitigation requirements are met, the land can be used effectively and buildings can be built.

・Corner lot mitigation

One way to ease the building coverage ratio is to ease corner lots.

Corner land is land located at the corner of intersecting roads.

There are regulations in the Building Standards Act, but for detailed standards on whether or not a corner lot is considered, please refer to the following.

This is left up to each municipality's ordinances and must be checked for each property.

By the way, corner lots are designated by specific administrative agencies, so the municipality where the property is located is

It is also necessary to check whether it is a specified administrative agency.

If you meet the corner lot conditions announced by the specified administrative agency, you can receive +10% relief.

As with fire-resistant buildings, judicious use of these mitigation measures can result in better use of land and

Since you can build buildings, this is a point you should definitely check.

・Relaxation requirements for building coverage ratio are a surprising blind spot

Building coverage ratio indicates the percentage of buildings that can be built on the land.

The land is very important and the person who bought the land must build a building within the building coverage ratio standards.

In other words, even if you want to build a larger building, there are restrictions due to the building coverage ratio.

Sometimes you have to be patient and build a building that is a little smaller than you had expected.

In such cases, relaxing the building coverage ratio mentioned above can be used, but this is surprisingly a blind spot.

There are many possible reasons for this, one of which is that it is written in a slightly smaller font than other text.

Not only are building coverage ratios, floor area ratios, and usage zones written in large letters, but they are also more well-known than the requirements for relaxing building coverage ratios.

It's easy to overlook this. Especially if someone who is not familiar with it creates a critical theory,

This kind of oversight is easy to occur and leads to the creation of incorrect and important theories.

Of course, just because it's written in small letters doesn't mean it's less important.

For example, even though the building coverage ratio can be relaxed, if this is not mentioned in the important statement,

If the buyer had received this explanation, they would have been able to build a bigger house, but because it was not mentioned in the important documents,

This means that you have suffered damage, which can quickly lead to trouble.

One way to prevent this from happening is to outsource it to professionals who are well-versed in writing critical essays.

The above-mentioned writing mistakes are caused by people who are inexperienced or who are busy with other work and cannot take the time to write important statements.

It happens often.

We have created many critical essays, and sometimes receive over 1 requests from one company.

We are an administrative scrivener corporation that can. We utilize our experience and know-how to create high-quality critical essays.

Road types and access obligations under the Building Standards Act

The Building Standards Act stipulates that a building must be adjacent to a road of 4m or more by at least 2m.

This is called a road access obligation and is also a requirement for building buildings.

To do this, it is necessary to understand the road types in the Building Standards Act, which are presented below.

In other words, as a general rule, you cannot build a building unless it is adjacent to the above road by more than 2 meters.

Contacting means that the land and road are connected to each other without any gaps.

If there is a waterway, etc., it may be determined that there is no access, so please be careful.

Also, the part that says they must be in contact for at least 2 meters, but this is only stipulated in the Building Standards Act.

This is the minimum level, and the details are left to the ordinances of each local government.

In other words, local governments can set stricter access obligations.

For example, in the "Osaka Prefecture Building Standards Act Enforcement Ordinance" and "Hyogo Prefecture Building Standards Ordinance,"

For special buildings such as apartment buildings that meet certain requirements,

There is a restriction that the building must be in contact with the road by at least 4 meters.

In other words, it is not only necessary to understand the Building Standards Act, but also the ordinances of each local government.

It is necessary to consider it in detail.

The regulations are so detailed that it is easy to overlook them, but if you overlook this part and create a heavy statement,

This can cause problems in real estate transactions.

Also, ordinances correspond to local rules, so it is important to check and understand them one by one.

It is also extremely difficult and can lead to failure.

Our company is capable of responding nationwide in the preparation of critical essays, and has extensive research experience in each prefecture.

It also supports local rules.

Other restrictions under the Building Standards Act

The Building Standards Act has many other restrictions in addition to those listed above.

• Restrictions on changing or abolishing guidance
• Wall line restrictions
• Minimum site area
• External wall retreat
• building height limit
• Shade regulation
• building agreement
• Restrictions by local government ordinances, etc.

For large cities, towns and villages, the information may be published online or listed on city planning information maps.

However, not all local governments are like this, so you need to check directly with the local government.

At that time, the points you need to keep in mind are:

Do not accept what the government officials say as 100% correct.

This is an actual case that occurred at our company, when we asked a government official if there were any restrictions on wall lines.

Not only does it not apply within the city, but there are also municipalities that have legally established such restrictions.

The answer was that there were almost no such cases.

However, in my experience, there are many municipalities that have restrictions on wall lines.

I felt that such a thing was impossible based on the provisions of the law, so I took a step further and asked the person in charge.

Then, the person in charge thoroughly confirmed the information, and as a result, the information was incorrect.

There were times when I was given correct information.

What I can say here is that of course government officials sometimes make mistakes, and not everyone is knowledgeable.

Despite this, if you take everything the person in charge says with a grain of salt, you may find that there is incorrect information.

Without realizing it, you may end up posting the exact information in the important commentary.

Of course, this is incorrect information, which could lead to trouble later on.

As we are an administrative scrivener corporation, we have many staff members who are well-versed in the law.

I think we were able to realize this because we have staff who are knowledgeable about the law.

If this was created by an inexperienced staff member or a staff member who is busy with other duties and does not have time,

I might have missed it.

Please rest assured that we are sensitive to the latest legal changes.

Zoning

Zoning is a set of rules that determine the types of buildings that can be constructed and restrictions on their uses.
It can be broadly divided into three types: residential, commercial, and industrial.

Residential use zone

• First-class low-rise residential area
• Class 2 low-rise residential area
• Class 1 medium-rise residential area
• Class 2 medium-rise residential area
• Type XNUMX residential area
• Class 2 residential area
• Semi-residential area
• rural residential area

Commercial use zone

• Neighborhood commercial area
• There is a commercial area.

Industrial use area

• Quasi-industrial zone
• Industrial area
• There are areas reserved for industry.

In this way, there are buildings that can be built and buildings that cannot be built, depending on the area of ​​use.

Both sellers and buyers of real estate should check in which zone the relevant real estate is located.

However, it is difficult to check each item individually as to what can be built in which zone.

It's difficult and takes time and effort.

By outsourcing the important essay writing work to us, you can save time and effort.

You can concentrate on your own work.