Hello, everyone.
This is Enta.
In my last post, I wrote a brief article introducing “○○-ya,” but I received comments saying, “I want to know more about everything” and “Don’t skip over the international parts.”
You're absolutely right. If you just pick out a few random parts, people will end up wondering, "Why is this included, but that isn't?" lol
But that's beside the point.
So, in this post, I’ll list all of Japan’s “○○-ya” businesses by category, without skipping any of the details I covered last time.
I'll also include the full comparison table with international data. It's going to be a pretty long post, but just think of it as some fun trivia lol.
First, regarding the evaluation criteria (meaning of ●, ○, and △)
Before listing a large number of “○○-ya” stores, I’ll explain the criteria for evaluation.
Since “○○-ya” is not an official legal name but rather a colloquial term used in the field, it’s not possible to say with absolute certainty that “this is the official name” in all cases.
So, in this article, I’ve organized the information into the following three steps.
- ●= Cases where examples of the actual use of the term “○○-ya” were confirmed on the websites of specialized businesses themselves or in industry materials
- ○= These exist as specialized professions or specialized construction trades, but it has not been confirmed whether the term “○○-ya” is used uniformly nationwide (it varies by region and worksite).
- △= Jobs that actually exist, but for which the term “○○-ya” is not widely used
In other words, even in the case of ●, this simply means that “there are instances where it is referred to that way”—it does not imply that it is an official name established by law or by a public agency.
Just to be clear on this point.
The official names of the civil engineering and architectural sectors are listed among the 29 sectors defined in the Construction Industry Act, as well as
Please refer to the competency assessment categories of the Ministry of Land, Infrastructure, Transport and Tourism’s Construction Career Up System (CCUS) (where rebar, formwork, grouting, foundation piles, slope disaster prevention, and road slope protection, among others, are designated as independent categories).
A Comprehensive List of Japan's "○○-ya" Shops
I'm going to list everything by category starting here. It's a long list. Brace yourself lol.
After all, I had the AI search the internet and spent a while thinking about it! LOL
1. Earthwork, Foundations, and Soil Mechanics
*Note: Some of these are in the same field, but I'll just post them as I found them for now.
| How to Address Someone | Ruling | Official/Related Job Titles | Main Responsibilities |
|---|---|---|---|
| Civil Engineer | ● | Civil Engineering Contractor | General Civil Engineering |
| Earthwork Contractor | ● | Earthwork | Excavation, Floor Excavation, Backfilling |
| Heavy Equipment Dealer | ○ | Mechanical Earthworks | BH, Bull, Heavy Equipment Construction |
| Surgeon | ○ | Construction Equipment Operator | Heavy Equipment Operator |
| Foundation Contractor | ● | Foundation Engineering | Fundamentals of Architecture and Structures |
| Kugiya | ● | Foundation Piling | On-site driven piles, precast piles, etc. |
| Pile Driver | ○ | Pile Driver | Pile Driving |
| Press-Fit Specialist | ○ | Press-in Worker | Press-in Steel Sheet Piles and Steel Pipe Piles |
| Yamadoriya | ○ | Retaining Wall Construction | Retaining walls, cut beams, etc. |
| Fukasoko-ya | ○ | Deep Foundation Work | Deep-foundation piles |
| Ground Improvement Contractor | ○ | Soil Improvement Worker | Deep- and Shallow-Layer Mixed Treatment, etc. |
| Medicine Dispenser | ○ | Chemical Injection Technician | Groundwater Sealing and Soil Stabilization |
| Injection Specialist | ● | Grout Worker | Chemical and Cement Injection |
| Grout Contractor | ○ | Grout Worker | Soil and Rock Grouting |
| Jet Shop | ○ | Jet Grouting Technician | High-Pressure Jet Agitation |
| Rock Grouting Specialist | ○ | Rock Grouting Work | Bedrock Improvement for Dams and Other Structures |
| Bowling Alley | ○ | Drilling Worker | Drilling, Surveying, and Construction |
| Well Driller | ● | Well Drilling | Well Drilling |
| Ido-ya | ● | Well Drilling | Well Construction |
| Well Point Shop | ○ | Wellpoint Construction | Decline in Groundwater Levels |
| Geological Surveyor | ● | Geological Survey | Boring Survey |
| Soil Testing Firm | ○ | Soil Testing | Density, Particle Size, and Strength Tests |
| Excavated Soil Disposal Company | ● | Construction Soil Disposal | Receipt and Transportation of Excavated Soil |
| Dump Truck Company | ○ | Earthwork Transportation | Transportation of Soil and Crushed Stone |
| Industrial Waste Company | ● | Industrial Waste Treatment | Construction Waste Disposal |
| Blasting Specialist | ○ | Blasting Technician | Rock Blasting |
| Crusher | ○ | Crusher Operator | Rock and Structural Breaching |
As for “injection services,” there was actually a case where a company specializing in chemical injections used the term “Emergency Injection Service List” itself lol.
Just looking at the number of issues with the ground and foundation alone, I’m already worried about what’s to come, lol.
2. Slope and Embankment Disaster Prevention (Our Core Business)
Since this is my day job, I’m writing this with a lot of passion.
| How to Address Someone | Ruling | Official/Related Job Titles | Main Responsibilities |
|---|---|---|---|
| Slope Construction Specialist | ● | Slope Protection Structures for Roads, etc. | General Slope Construction |
| Slope Specialist | ○ | Slope Disaster Prevention | Slope Stabilization Measures |
| Slope Disaster Prevention Specialist | ○ | Slope Disaster Prevention | Measures to Prevent Landslides and Rockfalls |
| Anchor Shop | ● | Anchor Worker | Ground Anchor |
| Spray Painting Company | ● | Mortar and Concrete Spraying Worker | Slope Spraying |
| Law Firm | ○ | Spray-Applied Formwork | Legal Framework Implementation |
| Las House | ○ | Plasterer (Specialized) | Wire Mesh Installation |
| Landscape Gardener | ○ | Landscape Engineer | Slope Greening |
| Landscape Contractor | ○ | Slope Greening Specialist | Seeds, Growing Media, and Mats |
| Tanegafukiya | ○ | Seed Sprayer | Seed Sowing |
| Thick-Layer Substrate Specialist | ○ | Vegetation Substrate Spraying Technician | Thick-Layer Substrate Spraying |
| Rock Bolt Contractor | ○ | Reinforcing Bar Installer | Reinforced Soil and Rebar Installation |
| Reinforcing Bar Installer | ○ | Reinforcing Bar Installer | Rock Bolt Installation |
| Rockfall Prevention Specialist | ○ | Rockfall Protection Structures | Nets, Fences, and Preventive Measures |
| Internet Cafe | △ | Rope Net Worker | Work on Steep Slopes at Height |
| Specialized Tree Removal Service | ● | Specialized Tree Removal | Tall Trees · Logging on Steep Slopes |
"Slope Contractors" and "Spray Coaters" are terms used by slope-specialized companies themselves when introducing their businesses.
It should be noted that the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) has divided the field previously grouped under the broad category of “slope contractors” into two separate categories for the purposes of CCUS capability assessment: “slope disaster prevention” and “slope protection work for roads and other structures.”
I guess even the traditional, large-scale “slope contractors” are gradually becoming more specialized under the current system, huh...
3. Concrete and Structural Framework
| How to Address Someone | Ruling | Official/Related Job Titles |
|---|---|---|
| Reinforcement Contractor | ● | Reinforcing Steel Worker |
| Press-fit Specialist | ○ | Reinforcing Bar Welder |
| Formwork Contractor | ● | Formwork Worker / Formwork Carpenter |
| Scrap Dealer | ○ | Formwork Demolition Worker |
| Formwork Dismantling Contractor | ○ | Formwork Removal |
| Ready-mix concrete company | ● | Ready-Mix Concrete Production and Delivery |
| Pump Shop | ● | Concrete Pump Operator |
| Pump Truck Driver | ● | Concrete Pump Operator |
| Doma-ya | ● | Concrete Floor Finisher |
| Plasterer | ● | Plastering |
| Hatsuriya | ● | Fishing Worker |
| The Demolisher | ● | Demolition and Chipping |
| Cutter Shop | ● | Cutting and Drilling Worker |
| Core Shop | ● | Diamond Core Drilling |
| Anchor Shop | ● | Retrofit Anchor Installation |
| Repairman | ○ | Concrete Repair Worker |
| Cross-Section Repair Specialist | ○ | Cross-Section Repair Worker |
| Crack Repair Specialist | ○ | Resin Injection Technician |
| Sticker Shop | ● | Sealing Technician |
| Grout Specialist | ○ | Sealing and Joint Work |
| Waterproofing Contractor | ● | Waterproofing Contractor |
| Blast Shop | ○ | Blast Operator |
| Carbon Fiber Shop | △ | Continuous Fiber Reinforcement Worker |
| Reinforcement Specialist | ○ | Structural Reinforcement Worker |
"Core Drilling Company" and "Cutting Company" are terms used by companies that specialize in cutting and drilling, and "Pump Company = Concrete Pumping Contractor" is also a well-established term.
We have confirmed examples where “doma-ya” are described as highly independent professionals, with specialized companies themselves describing their work as specializing in concrete floor finishing.
Although the term “anchor contractor” is used here, it refers to “retrofitted anchors” (a method in which holes are drilled into a structure after construction to secure metal fittings) rather than ground anchors for slopes. This distinction can be confusing, so please be careful.
4. Steel Framing, Steel Structures, and Heavy Objects
| How to Address Someone | Ruling | Official/Related Job Titles |
|---|---|---|
| Tobiya | ● | Scaffolder |
| Scaffolding Contractor | ● | Scaffold Jumping |
| Steel Structure Rigger | ● | Steel Frame Scaffolding |
| Heavy-Lift Rigger | ● | Weight Jump |
| Weight Shop | ● | Heavy-Lift Crane Operations and Heavy-Lift Installation |
| Steel Frame Contractor | ● | Steel Fabricator |
| Metalworking Shop | ● | Metalworking |
| Blacksmith | ● | Blacksmith |
| Welding Shop | ● | Welder |
| Metal Fabricator | ○ | Can Maker |
| Stud Shop | ○ | Stud Welder |
| Rivet Shop | △ | Riveter |
| Frame Builder | ○ | Steel Frame Erecting |
| Crane Company | ○ | Crane Operation and Lifting |
| Lifting Contractor | ○ | Yo Heavy Industries |
| Machinery Installer | ○ | Mechanical and Equipment Installation Technician |
There are examples where specialized companies themselves explain that “Jūryō-ya” is “often used as an alternative term for heavy-lift scaffolders,” and there are also confirmed instances where specialized companies use “Sakabane-ya” as their business name.
As anyone in this industry knows, the field of construction work is further subdivided into categories such as scaffolding workers, steel frame workers, heavy-lift workers, and power line workers.
5. Roads, Pavement, and Traffic Safety
| How to Address Someone | Ruling | Official/Related Job Titles |
|---|---|---|
| Paving Contractor | ● | Paving Worker |
| Asphalt Contractor | ○ | Asphalt Paver |
| Road Subgrade Contractor | ○ | Subgrade Work |
| Cutter Shop | ● | Pavement Cutter |
| Line Shop | ● | Lane Marking and Road Surface Marking Work |
| White Line Shop | ○ | Landscape Line Worker |
| Sign Maker | ○ | Road Sign Installer |
| Guardrail Contractor | ○ | Guardrail Installer |
| Fence Contractor | ● | Fence Installer |
| Traffic Signal Technician | ○ | Traffic Signal Equipment Technician |
| Lighting Specialist | ○ | Street Lighting Installation Technician |
| Bricklayer | ● | Paving and Concrete Block Work |
| Interlocking Paver Installer | ○ | Paving Block Worker |
| Curbstone Contractor | △ | Curbstone Worker |
| Safety Equipment Company | ○ | Road Traffic Safety Facilities Construction |
The term "line-ya" has particularly well-established usage examples; road marking contractors themselves refer to themselves as "the town's line-ya," and examples can be found on official municipal websites where the representative of a contracting company is quoted as saying, "We are line-ya."
6. Bridges
| How to Address Someone | Ruling | Official/Related Job Titles |
|---|---|---|
| Hashiya | ● | Bridge Engineer |
| Bridge Builder | ○ | Bridge Engineer |
| Steel Structure Rigger | ● | Bridge Construction |
| Scaffolder | ○ | Bridge Erector |
| Computer Store | ○ | Prestressed Concrete Technician |
| A Nervous Person | △ | PC Prestressing Engineer |
| Grout Contractor | ○ | PC Grout |
| Support Specialist | ● | Bridge Bearing Installer |
| Expansion Joint Specialist | ○ | Expansion Joint Installation |
| Slab Builder | △ | RC/PC Slab Worker |
| Bridge Deck Waterproofing Contractor | ○ | Bridge Deck Waterproofing Work |
| Bridge Painter | ○ | Bridge Painter |
| Blast Shop | ○ | Surface Preparation |
| Repairman | ○ | Bridge Repair |
| Seismic Retrofit Contractor | ○ | Seismic Retrofit of Bridges |
| Jack Service | △ | Jack-Up Installation |
Examples of the term "support specialist" can be found on the Japan Society of Civil Engineers’ website for engineers.
7. Tunnel and Underground Construction
| How to Address Someone | Ruling | Official/Related Job Titles |
|---|---|---|
| Tunnel Builder | ○ | Tunnel Worker |
| NATM Shop | △ | NATM Construction |
| Shield Shop | ○ | Shield Construction Worker |
| Promoter | ● | Trenching Machine |
| Shaft Builder | ○ | Shaft Worker |
| Caisson Contractor | ○ | Caisson Worker |
| Submarine House | ○ | Caisson Worker |
| Saku Iwaya | ○ | Saku Rock Engineering |
| Blasting Specialist | ○ | Blasting Technician |
| Segment Specialist | △ | Segment Assembly Worker |
| Backroom Dealer | △ | Backfill Injection Worker |
| Injection Specialist | ● | Grout Worker |
There are examples where specialized companies themselves describe “pile-driving contractors” as “a specialized type of construction business.”
8. Rivers, Harbors, and the Ocean
| How to Address Someone | Ruling | Official/Related Job Titles |
|---|---|---|
| Port Worker | ○ | Port Civil Engineering |
| Offshore Civil Engineer | ○ | Offshore Construction |
| Dredging Company | ○ | Dredging Engineer |
| Diving Shop | ○ | Diver |
| Marine Crane Operator | ○ | Marine Cranes |
| Caisson Contractor | ○ | Caisson Construction |
| Wave-Breaker Block Contractor | △ | Wave-dissipating structure |
| Rubble Dealer | △ | Stone Mason |
| Shore Protection Contractor | ○ | Shore Protection Works |
| Suimon-ya | ○ | Sluice Gate Installer |
| Pump Shop | ○ | Pump Equipment Technician |
| Underwater Concrete Worker | △ | Underwater Concrete Work |
9. Water and Sewer Systems and Pipelines
| How to Address Someone | Ruling | Official/Related Job Titles |
|---|---|---|
| Plumber | ● | Water Supply and Drainage / Waterworks Construction |
| Plumber | ● | Plumber |
| Kanaya | ○ | Pipe Fitter |
| Sewer Worker | ○ | Sewer Worker |
| Pipe Fitter | ○ | Pipe Fitter |
| Promoter | ● | Trenching Machine |
| Trench Digger | △ | Open-Cut Pipeline Construction Worker |
| Equipment Contractor | ● | Plumbing and Drainage System Technician |
| Pump Shop | ○ | Pump Equipment Technician |
| Valve Shop | ○ | Valve Installation Technician |
| Sewage Treatment Tank Contractor | ● | Sewage Treatment Tank Installer |
| Gas Company | ● | Gas Pipe Fitter |
"Plumber" is recognized as a clear industry term used by water supply and drainage companies themselves.
10. Railroads
| How to Address Someone | Ruling | Official/Related Job Titles |
|---|---|---|
| Track Worker | ○ | Track Worker |
| Track Maintenance Worker | ○ | Track Maintenance Worker |
| Rail Worker | △ | Track Worker |
| Overhead Line Technician | ○ | Electric Train Line Technician |
| Traffic Signal Technician | ○ | Railway Signal Technician |
| Electronics Store | ● | Railway Electrician |
| Civil Engineer | ● | Railway Civil Engineering |
| Tunnel Builder | ○ | Railway Tunnel Engineer |
11. Surveying and Investigation
| How to Address Someone | Ruling | Official/Related Job Titles |
|---|---|---|
| Surveyor | ● | Surveying |
| Layout Specialist | ● | Architectural Surveying and Layout |
| Soil Investigation Specialist | ● | Soil Investigation |
| Geologist | ● | Geological Survey |
| Bowling Alley | ○ | Geological Boring |
| Test Prep Center | ○ | Materials and Soil Testing |
| Non-Destructive Testing Specialist | ○ | Non-Destructive Testing |
| Reinforcement Bar Locator | ○ | Internal Inspection of RC Structures |
There are examples where companies specializing in layout marking use the term “layout marking company” to refer to themselves.
12. Landscaping, Exterior Construction, and Stonework
| How to Address Someone | Ruling | Official/Related Job Titles |
|---|---|---|
| Landscape Contractor | ● | Landscape Contractor |
| Landscape Gardener | ● | Landscape Construction Worker |
| Landscape Gardener | ● | Landscape Installer |
| Stone Shop | ● | Stonemason |
| Stone Mason | ○ | Mason |
| Bricklayer | ● | Block Worker |
| Fence Contractor | ● | Fence Installer |
| Shibaya | ○ | Turf Installer |
| Park House | △ | Park Facilities Engineer |
| Playground Equipment Store | ○ | Playground Equipment Installer |
13. The number increases even further when architecture-related fields are included (for reference)
Since construction-related "ya" companies commonly operate on civil engineering sites as well, I’ll list their names here for reference. Since I haven’t cross-checked their classifications or job descriptions this time, I’ll limit myself to listing their names.
- Carpenter / Carpentry Shop
- Roofing Contractor
- Tile Shop
- Auto Body Shop
- Window Installer
- Glass Shop
- ALC Shop
- Siding Contractor
- Tiler
- Waterproofing Contractor
- Sticker Shop
- Painter
- Interior Designer
- Wallpaper Installer
- Board Shop
- Lightweight Ceiling Shop
- Door and Window Craftsman
- Furniture Store
- Tatami Maker
- Curtain Shop
- Duct Installer
- Insulation Company
- Insulation Specialist
- Air Conditioning Technician
- Equipment Contractor
- Electronics Store
- Electronics Technician
- Telecom Guy
- Firefighter
- Instrumentation Technician
- Sign Maker
- Sign Shop
- Elevator Technician
- Gondola Shop
- Temporary Housing Contractor
- Dry Cleaner
- Demolition Contractor
Even on residential construction sites, there are soil investigation contractors, scaffolding contractors, rebar contractors, formwork contractors, concrete pumping contractors, sheet metal workers, roof tile installers, siding installers, painters, waterproofing specialists, insulation installers, plasterers, tile setters, interior finishers, tatami mat installers, door and window installers, electricians, plumbing and mechanical contractors, and HVAC technicians—a vast number of these “specialists” are actively employed on actual construction sites.
Even if we just exclude the duplicates identified so far, there are well over 100 distinct fields of expertise.
Just looking at the numbers in our industry alone, I’m once again struck by how impressive the division of labor in Japan’s construction industry really is, lol.
It really makes you think, "Seriously, isn't this way too much of a division of labor!??" doesn't it...
Japan vs. Overseas Comparison Chart [All Categories]
Next, I will list, to the best of my knowledge, how jobs similar to Japan’s “○○-ya” are classified in the occupational classifications of the United States, the United Kingdom, and Australia.
The job titles for overseas positions are based on research using publicly available sources such as O*NET (the U.S. Department of Labor’s occupational database), Safe Work Australia, and IRATA (the International Rope Access Trade Association). Since I looked them all up using AI, I haven’t actually gone out to overseas sites to verify them myself lol (Well, obviously lol).
Please consider this merely as a trend based on the data.
| Overseas Job Types | Major Countries | Artisans Near Me in Japan | Are there any positions available in Japan? |
|---|---|---|---|
| Steel Fixer | UK and Australia | Reinforcement Contractor | ◎Almost the same |
| Reinforcing Ironworker | 米 | Reinforcement Contractor | ◎ |
| Rod Buster | 米 | Reinforcement Contractor | ◎ (However, there is no separate term for “Rod Buster” in Japan.) |
| Steel Tier | 米 | Reinforcement Contractor | ◎ |
| Formworker | 英 | Formwork Contractor | ◎ |
| Scaffolder | UK and Australia | Scaffolding Contractor | ◎ |
| Structural Steel Erector | U.S. and Australia | Steel Erector / Steel Fabricator | ◎ |
| Rigger | U.S. and Australia | Heavy-Lift Rigger / Heavy-Lift Specialist | ◎Close |
| Heavy Lift Rigger | 米 | Weight Shop | ◎Close |
| Pile Driver Operator | 米 | Pile Driver / Pile Driving Machine Operator | ◎ |
| Piling Attendant | 英 | The Pile Driver's Work Area | △ There is work, but it does not have a specific job title. |
| Groundworker | 英 | Earthwork + Landscaping + Drainage + Paving | × No one-on-one sessions for Japanese job types |
| Road Surfacing Worker | 英 | Paving Contractor | ◎ |
| Asphalt Paver Operator | 米 | Finisher Operator at a Paving Company | ◎Work required |
| Asphalt Raker | 米 | Paving Contractor's Rake Operator | △Independent "rake shops" are not common. |
| Screed Operator | 米 | Paving Contractor | △In Japan, this is not usually classified as a separate occupation. |
| Asphalt Roller Operator | 米 | Roller Operation | ◎Work required |
| Earth Driller | 米 | Bowling Alley | ◎ |
| Diamond Driller | 米 | Drilling and Core Sampling Companies | ◎ |
| Water Well Driller | 米 | Well Drillers / Well Contractors | ◎ |
| Driller | 豪 | Bowling Alley | ◎ |
| Driller's Assistant | 豪 | A Bowling Alley Owner's Perspective | △ There are virtually no independent positions |
| Shotcrete | 米 | Spray Coating Contractors / Spray Coating Workers | ◎ |
| Nozzleman | U.S. & International | Spray Applicator | ◎ |
| Cement Mason | 米 | Plasterer | ◎Close |
| Concrete Finisher | 米 | Doma-ya | ◎Quite close |
| Concrete Worker | 豪 | Concrete Worker / Floor Finisher | ◎ |
| Pipelayer | 米 | Pipe Fitter / Plumber | ◎ |
| Drainer | 豪 | Drainage Systems and Plumbing Contractor | △ In Japan, roles equivalent to the independent "Drainer" position are scattered across various organizations. |
| Fence Erector | 米 | Fence Contractor | ◎ |
| Blaster | 米 | Blasting Specialist | ◎ |
| Powderman | 米 | Blasting Specialist | ◎ The job duties are similar |
| Shot Firer | 豪 | Blasting Specialist | ◎ |
| Dredge Operator | 米 | Dredging Contractor / Dredge Operator | ◎ |
| Rail Track Maintenance Worker | 米 | Track Maintenance Worker | ◎ |
| Trackman | 米 | Track Worker | ◎ |
| Tunnel Operator | 英 | Tunnel Builder | ◎ |
| Pipejacking Technician | 英 | Promoter | ◎ |
| Mastic Asphalter | 英 | Asphalt Waterproofing Contractor | ◎Close |
| Laggers | 豪 | Insulation Company | ◎Close |
| Construction Rigger | 豪 | Roofer / Heavy-Lift Roofer | ◎Close |
| Crane Chaser | 豪 | Sling Operator / Signal Person | × There are virtually no independent "○○ shops" |
| Dogger | 豪 | Sling Operators and Signalers | ×In Japan, this is not treated as a separate job category. |
| Surveyor's Assistant | 豪 | Surveying Assistant / Field Assistant | △ Not a strong standalone job category |
| Steeplejack | 英 | Roofer + Rope Access + High-Altitude Repairs | ×No direct equivalent position in Japan |
| Rope Access Technician | International | Rope Access Worker | △ Although there is work in this area, it is not a major independent CCUS sector in Japan. |
Here's the AI's response exactly as it is lol
I was actually able to verify this by searching the U.S. Department of Labor’s O*NET occupational database, which lists"Rodbuster" as an alternative name for "Reinforcing Iron and Rebar Workers", andWithin the single occupational category titled “Paving, Surfacing, and Tamping Equipment Operators,” the following job titles are listed: Asphalt Paver Operator, Asphalt Raker, Screed Operator, and Asphalt Roller Operator.These are the two points. In other words, official documents confirm that in the United States, while road paving is classified as a single occupational category, the job titles used on-site are divided by machine type and role. Please note that the information regarding other items is based on research using industry materials and publicly available information from various countries.
Jobs that exist overseas but haven't evolved into independent "○○-ya" businesses in Japan
I’ll also introduce the opposite scenario: jobs that are recognized as distinct professions or certifications overseas, but in Japan are scattered across multiple “XX-ya” roles.
Groundworker (UK)
In the United Kingdom, it is recognized as a distinct profession, encompassing tasks ranging from site preparation, layout, drainage, and concrete work to the construction of roads, sidewalks, and hard landscaping.
In Japan, I imagine these roles would be divided among an earthwork contractor, a landscaping contractor, a drainage contractor, and a paving contractor. Therefore, it follows that there is no single “○○-ya” that perfectly matches the Japanese model.
Piling Attendant (United Kingdom)
This is a profession that serves as an assistant to a pile driver. While there are, of course, people in Japan who perform this work, the practice of operating as a separate category of craftsman known as a “pile driver’s assistant” is not common.
The general consensus is that while the work itself exists in Japan, it is virtually nonexistent there as a distinct occupational category.
Dogger (Australia)
In Australia, "dogging" is classified as a separate high-risk work license category.
Safe Work Australia also classifies "Dogging" and "Rigging" as separate license categories.
In Japan, this would typically involve slinging and crane signaling, but since the system isn’t structured in such a way that specialized “slinging contractors” routinely visit job sites, the conclusion is that there is no direct one-to-one equivalent of “XX-ya” in Japan.
Crane Chaser (Australia)
This is recognized as a distinct profession involving the slinging of loads onto cranes and winches, directing the movement of loads, verifying load weights, and signaling to operators. In Japan, this role would correspond to a slinger plus a signaler; however, specialized companies equivalent to “Crane Chaser” firms do not exist within the standard Japanese civil engineering construction system.
Steeplejack (United Kingdom)
They are considered specialists in working at heights to repair tall chimneys, towers, high-rise buildings, monuments, bridges, and other structures; their work is said to include scaffolding, harnesses, roofing, masonry, painting, demolition, and lightning rod installation.
In Japan, these services are typically divided among scaffolders, rope access specialists, painters, and repair contractors, so it is reasonable to conclude that there is no single “XX specialist” who handles them directly.
Rope Access Technician (International)
IRATA (International Rope Access Trade Association) has established a globally standardized certification program for Industrial Rope Access Technicians, and this skill is reportedly used in construction, civil engineering, and natural slopes. As of 2026, IRATA reports that it has trained over 130,000 rope access technicians at more than 700 companies worldwide.
Although rope access construction is practiced in Japan as well, “rope access contractors” are not recognized as a major independent field by the Ministry of Land, Infrastructure, Transport and Tourism’s CCUS.
How Are Japanese "Slope Contractors" Perceived Overseas?
This is what I was most curious about this time.
We were unable to identify any standard occupational classifications within the official occupational classifications of the United States, the United Kingdom, and Australia that directly correspond to the broad category of “slope contractor” found in Japan.
Overseas, it seems that job roles tend to be divided into distinct functional categories depending on the nature of the work.
| The Work of Slope Engineers in Japan | Job Types Considered Similar Overseas |
|---|---|
| Sprayed Mortar | Shotcreting Operator / Nozzle Operator |
| Drilling | Driller |
| Anchor | Drilling / Ground Engineering Crew |
| Rock Bolt | Ground Support / Drilling Crew |
| Work at Height on Slopes | Rope Access Technician |
| Blasting | Blaster / Shot Firer |
| Ground Improvement | Ground Engineering |
| Vegetation | Landscaping / Erosion Control Crew |
| Heavy Equipment Shaping | Heavy Equipment Operator |
| Rockfall Prevention Measures | Rockfall / Rope Access / Geotechnical Contractor |
In the United States, shotcrete professionals are certified by the ACI (American Concrete Institute) as “shotcreters,” and certifications are reportedly categorized by method, including wet-mix and dry-mix.
In other words, the scope of work typically handled by a single Japanese slope stabilization contractor—including (drilling, rebar insertion, and anchoring) as well as (shotcrete application, formwork, wire mesh, vegetation, and rockfall protection)—appears to correspond, under international occupational classifications, to a single company encompassing multiple specialized trades.
*The discussion of international classifications presented so far is based on research using publicly available materials such as O*NET, Safe Work Australia, and IRATA.
Please consider this merely as a trend based on the data.
I think the actual implementation varies by country, state, and organization.
What Finally Became Clear
Broadly speaking, the “○○-ya” companies in Japan’s construction industry form a massive specialized division of labor system encompassing earthwork and ground improvement → slope stabilization → foundation piles → concrete → steel framing → roads → bridges → tunnels → rivers and ports → water and sewer systems → railways → surveying → exterior construction → building systems and Architecture.
Even just within the scope of this research, I was able to identify over 100 different types of “○○-ya” stores, excluding duplicates.
What is particularly distinctive about Japan compared to other countries is thatReferring to a company or team as “○○-ya”In contrast, the U.K., the U.S., and AustraliaBreaking down an individual’s job skills into separate “trades” (skilled occupations)It feels like there's a tendency toward that.
That’s exactly why, overseas, there are jobs like Rod Buster, Piling Attendant, Groundworker, Dogger, Crane Chaser, and Steeplejack—jobs that, to Japanese people, make you wonder, “Is that really a separate profession all on its own?”
Conversely, the model adopted by Japanese slope maintenance contractors—which combines multiple skills into a single specialized industry—had no direct counterpart among the official classifications in the United Kingdom, the United States, and Australia that we examined this time.
I don't think it's a matter of which one is better; I just think the way the work is structured is different.
If job roles were as rigidly defined as they are overseas, a small company like ours might actually have had trouble keeping operations running smoothly.
When we compare our job titles with international classifications like this, we often make discoveries we wouldn’t normally notice.
That's really interesting!
See you later.
