Application for building confirmation for new No. 3 building (carport)
[Important points to note when adding peripheral facilities] Choosing carport options! Impact on building area
Updated: July 2026, 8
"I want a carport that can be sized to fit the property and makes it easy to get cars in and out."
When considering installing a carport, many people express this preference.
However, when adding options to adjust the size or increase strength, convenience is important,Requirements for relaxation of building coverage ratio,Impact on building permit applicationsThis needs to be taken into consideration.
This article explains the key points to consider when choosing options for a carport, whether you're a construction company representative making a proposal to a client or building a carport for your own home.
Notes on options regarding size changes and strength
High openness and impact on building area
Carports are recognized as having "high openness" if they meet certain conditions, such as not having walls, and are therefore subject to measures that relax their inclusion in the building area calculation.
However, adding options may cause the building to deviate from this requirement, potentially exceeding the building coverage ratio, so prior calculation is essential.
Notes on options regarding size changes and strength
Utilization of beam extension
Instead of making the roof larger, shift the position of the pillars outwards."Beam extension"This is a method of widening the spacing between pillars to make it easier for cars to enter and exit.
Since the roof area itself can be kept down, there is the advantage of preventing an increase in the building area.
Before construction, we check whether the extended beams and columns will interfere with existing block walls or other structures, and whether a sufficient distance can be maintained from the property boundary.
Trimming process
When modifying the roof to fit the site, the spacing between columns may become narrower.
For carports to qualify for building area reduction"High degree of openness"Since it may deviate from the requirements and exceed the building coverage ratio, prior calculation is essential.
Addition of support columns and long columns
In some cases, additional support columns may be added to protect against strong winds, or longer columns may be selected to accommodate taller vehicles.
Confirmation of foundation interference and property boundaries
Impact on high openness
In the case of long columns: Impact on the lighting requirements of a house
Adding columns or changing their height will affect various requirements in building permit applications, so prior consideration is necessary.
Installation of side panels
Protects the car from rain and wind coming in from the sides, keeping it cleaner.Side panelWhile this is a popular option, the addition of a wall can compromise the requirement for a high degree of openness.
Since mitigation measures are not available and a significant portion of the building area is included, caution is advised if there is limited space on the property.
Installation of lighting equipment
For nighttime safety and security purposes, sensor-activated lighting devices may be installed.
These fixtures are not bulky and do not directly affect the size, material, or spacing of the pillars of the carport, so they have little impact on building permits and can be installed freely.
Options like these, which do not directly affect the size, material, or spacing of the pillars of the carport, will have less impact on building permits.
Storage rack
surveillance camera
These additions are less subject to legal restrictions, so you can freely combine them according to your purpose.
Summary
When choosing options to change the size and strength of a carport, not only is convenience improved,"Impact on high openness (mitigation measures)", "Interference with foundations", "Daylight requirements"This needs to be taken into consideration.
To provide our customers with appropriate proposals and ensure the construction proceeds smoothly, let's investigate the necessary procedures in advance.
Benefits of Choosing Support Gyoseishoshi Law Firm
The complex pre-consultation process, which varies from municipality to municipality, the creation of rainwater drainage route diagrams, and the building permit application procedures can take unexpectedly long and troublesome if you are not familiar with them.
At Support Administrative Scrivener Corporation, our expert staff, who are familiar with the rules of local governments nationwide and the trends of each area, provide comprehensive support from preliminary consultations to various permit and confirmation applications.
"We want to customize the size to fit the site, but we don't know how that will affect the building coverage ratio."
"The process is stalled because we need to verify the requirements related to the addition or modification of pillars."
"We want to proceed with discussions quickly in order to meet the scheduled start date for construction."
Business owners and clients facing these kinds of problems should not hesitate to contact Support Administrative Scrivener Corporation!
Suitable for large and medium-sized companies
We specialize in handling large-scale business procedures for large and medium-sized companies.
The larger the company, the more complex the process can become, with more and more frequent building confirmation applications and more partners (architectural offices, etc.); however, our company is able to handle even these complicated procedures simply and quickly.
Support provided by a team with extensive experience in building permit applications
Building permit applications are one of our specialities. Our building confirmation application teams in our Tokyo, Nagoya, and Osaka branches work together to ensure that applications are processed quickly.
Fast Response
The application for building confirmation is a procedure that must be completed before construction begins. If the application is delayed, the installation of the carport will also be delayed. Therefore, a sense of speed is important.
We can respond quickly with our specialized teams located at locations across the country. In addition, we handle everything from preparing the documents to submitting the application, so you can focus on your own business.
Finally
The common sense that "You don't need to apply for something like a carport" is no longer valid. Due to the revision of the Building Standards Act in 2025, carports that are larger than 10 mXNUMX, installed in fire prevention areas, or connected to the main house will, in principle, require a confirmation application. Furthermore, depending on the local climate (strong winds, snowfall), thorough safety checks are also required.
