Basic knowledge of construction/renovation terms! What are the construction classifications of A, B, and C?
This time, we will explain the ``construction categories'', ``A construction'', ``B construction'', and ``C construction'', which are important points when constructing commercial buildings and office buildings. Please pay attention not only to those involved in construction, but also to those who are currently considering relocating their offices or opening a new store.
What is the construction classification? Check the table first
Construction classification refers to the classification of construction work for commercial buildings and office buildings.
- Selection of vendor
- Burden of costs
It shows who is responsible for each.
It can be divided into three categories as shown in the table below.
Construction classification table
| Construction classification | Vendor selection | order | Cost burden |
|---|---|---|---|
| A construction | owner | owner | owner |
| B construction | owner | tenant | tenant |
| C construction | tenant | tenant | tenant |
In many cases, owners decide on the classification of each type of work in advance and avoid disputes such as, ``Who will pay for this work?''
"A construction" related to common areas and building structure
A construction refers to work in which the owner selects a contractor and bears the cost. Generally, this includes construction work related to the structure of the building itself and items in common areas.
Example of A construction
Construction of building exteriors/walls, elevators, shared toilets, stairs, shared corridors, etc.
“B construction” concerns the overall safety even in private areas
B construction refers to construction in which the owner selects a contractor and the cost is borne by the tenant.
This refers to equipment in private areas, and generally includes construction work that affects the overall building structure, electricity, water, etc. If a tenant chooses a contractor based on price, the owner is responsible for selecting the contractor because the safety of the building as a whole is concerned.
Since the owner prioritizes safety, it may be more expensive than if the tenant chooses the contractor themselves, and this may lead to problems. If you have any concerns, we Recommend checking in advance to see if the tenant is also satisfied with the price.
B construction example
Additions and changes to air conditioning equipment, water supply and drainage equipment, distribution boards, gas and electrical equipment, relocation and replacement of firefighting equipment, etc.
*All are proprietary parts
"C construction" is a proprietary area that does not involve the structure of the building, such as the interior.
C construction refers to work in which the tenant selects a contractor and also bears the cost. This includes interior work on proprietary areas that are not related to the structure of the building. In many cases, the installed equipment can be removed by the tenant when they move out, but they are often required to return it to its original condition.
C construction example
Interior work such as replacing wallpaper and carpet, replacing lighting equipment, changing internet and telephone wiring, etc.
The above is an explanation of the construction classification.
We have a lineup of equipment that can be used for each type of construction work. Please also take a look at Equipment Handled page.
*The published photo is an image.
*All article contents are based on cases in Japan.