What are the property requirements for a certified auto workshop (specified-maintenance certification)?

In short: a property usable as a certified auto workshop (specified maintenance, Article 78 of the Road Transport Vehicle Act) is decided by three points — (1) whether the use-zone allows an auto repair shop, (2) whether the certification-standard work bay and inspection bay (Article 80) fit with enough width and ceiling height, and (3) whether the floor and frontage road can take lift work and the vehicles. All can be confirmed before the lease is signed.

A "certified workshop" that carries out disassembly maintenance and electronic-control-device maintenance cannot open without the certification of the District Transport Bureau Director. And the certification is granted only once the size, equipment and people meet the standards. "We leased the property, then applied for certification and the bay was too small" — the same rework that hits care facilities and clinics hits auto workshops too. This is for operators starting a specified-maintenance business (certified workshop) in Tokyo and for the real estate staff who handle workshop properties, setting out in order what can be checked before signing. Final confirmation of suitability is made at the District Transport Bureau / Transport Branch Office with jurisdiction over the site.

What floor area and ceiling height does a certified specified-maintenance workshop need?

It varies with the class of vehicle handled, but for passenger ordinary vehicles and four-wheel light-standard vehicles you need room for the indoor work area (the vehicle work bay and inspection bay), the parts work area and the vehicle storage area together.

Anyone intending to run a specified-maintenance business must, under Article 78, paragraph 1 of the Road Transport Vehicle Act (Act No. 185 of 1951), obtain the certification of the District Transport Bureau Director. The standards for certification are set in Article 80 and the Enforcement Regulation, and the scale of the work areas is fixed in the Regulation's tables by class of vehicle. For passenger ordinary and four-wheel light-standard vehicles, the rough guide is as follows.

Work area	Rough size (passenger ordinary / four-wheel light-standard)
Vehicle work bay	width 4m+ × depth 8m+
Inspection bay	width 4m+ × depth 8m+
Parts work area	8㎡+
Vehicle storage	width 3m+ × depth 5.5m+

For large vehicles (gross weight 8t+, etc.) the figures grow, with the vehicle work bay around width 5m+ × depth 13m+. The ceiling must be high enough to do lift work on the target vehicle, and the floor must be smoothly paved. If you do electronic-control-device maintenance (below), you also need an electronic-control-device inspection-and-maintenance area, but it may be shared with the vehicle work bay and inspection bay. How use-zone and floor-area ratio drive land price is set out in Why Japanese land prices change with the "floor-area ratio".

Are there places, by use-zone or surroundings, where an auto workshop cannot open?

Yes. An auto repair shop is subject to the use-zone restrictions of the Building Standards Act and cannot be built in many residential zones.

Clinics and nurseries do not get stuck on use-zone, but auto repair shops do. Article 48 and Table 2 of the Building Standards Act (Act No. 201 of 1950) divide the zones where an auto repair shop may be built by the total floor area of the work area. Per the MLIT summary of use restrictions, it is roughly as follows.

Use-zone	Auto repair shop (by total work-area floor area)
Cat. 1/2 low-rise & mid/high-rise residential exclusive, agricultural residence, Cat. 1/2 residential	cannot be built
Quasi-residential	allowed if total work-area floor area ≤150㎡
Neighbourhood commercial / commercial / quasi-industrial	allowed if ≤300㎡
Industrial / exclusive industrial	no area limit

The point to watch is that the "work area" size in the certification standard and the "work-area floor area" in the use-zone restriction are different rulers. Secure a large indoor work area to obtain certification, and its floor area may exceed the use-zone ceiling (150㎡ in quasi-residential), so it cannot be built there. That is why quasi-industrial and industrial zones suit workshops. Whether you clash with neighbours over noise, paint fumes and queuing vehicles is also a pre-signing point. On use-zone biting first for business property, see What to check before signing on a clinic property; on the office and garage of a haulage business, How to choose the office and garage property to start a haulage business.

How do property requirements differ between a certified workshop and a designated workshop (private inspection station)?

A designated workshop needs, on top of the certified-workshop requirements, a "completion inspection bay" and inspection machinery. The property is larger and the equipment burden heavier.

A certified workshop brings the maintained vehicle to the Transport Branch Office's inspection lane. A designated workshop (private inspection station, Article 94-2 of the Act) is a certified workshop that also holds the inspection equipment and an automobile inspector and can issue a safety-standard conformity certificate. In exchange for skipping the drive-in, the property requirements grow.

Category	Property / equipment requirements
Certified workshop (Art. 78)	work bay, inspection bay, parts work area, vehicle storage, work machinery, employees engaged in specified maintenance
Designated workshop (Art. 94-2)	the certified-workshop requirements plus a completion inspection bay (room and ceiling height for an inspection lane), testers and other inspection machinery, and an appointed automobile inspector

The usual order is to choose the property as a certified workshop first, then aim for a designated workshop (private inspection station) once the business grows. Assume a designated workshop from the outset and the required site, ceiling height and investment change greatly. Deciding which you target at the property-selection stage prevents rework.

When getting certification on a leased property, what should you confirm with the landlord before signing?

Confirm "may I use it for this purpose" and "will the building take the work and heavy equipment" in writing, before signing.

To open a certified workshop on a lease, look at both the contract and the current condition. The key checks are these.

Item to confirm	Why before signing
Whether "auto maintenance (specified maintenance)" is in the permitted use	A restricted-use contract blocks the later certification application
Whether lifts/pits, floor cutting and three-phase 200V power may be installed	Agree the restoration and fit-out scope first, or exit costs balloon
Frontage road width and entrance width	Whether the vehicles handled (especially large ones) can enter — tied to the vehicle-storage and work-bay entrance width
Use-zone and the inspection certificate / building-confirmation history	Whether an auto repair shop may be built there and whether a use-change confirmation is needed
Fire, drainage and paint-booth exhaust	If you handle paint or organic solvents, fire, water-quality and air rules apply

These can be confirmed at the viewing and before signing. Learn after signing that "that use is not allowed" or "the floor pit cannot be added", and the whole certification design is redone. How to read a lease is in Where to read a lease agreement; why the same rework hits care facilities is in The real reason you can't find a property for a care business. For business property in general see investment and business property, and for the office and company set-up, company set-up and choosing an office.

Who handles the property-requirement check and who the certification application?

The property (real estate) and the certification (administrative procedure) are handled by different parties.

Launching a certified workshop splits into finding and contracting the property, and obtaining certification. Whether the people (maintenance supervisor, workers) and equipment meet the standard is examined within the certification application, so fix the property first and you may find it fails and has to be redone — which is why the points above are laid out before signing. The human requirements, documents and Transport Branch procedure of the application itself are set out in the paired article (administrative-scrivener side), The certification application for automobile specified maintenance (disassembly maintenance): what requirements and how to proceed.

Matter	Party / counter
Property investigation and brokerage, the lease/sale of the work premises	Real estate transaction operator
The specified-maintenance certification application, judging the work-area/equipment requirements, preparing documents for public offices	Administrative scrivener
Building confirmation / use-change application for the certification and completion inspection bay	Architect / administrative scrivener
Incorporation registration when forming a company	Judicial scrivener
Accounting and tax	Licensed tax accountant
Disputes over rent, restoration, eviction	Attorney

Who should you consult?

Investigation, brokerage and the sale/lease of the property are undertaken by Yotsuba Real Estate Co., Ltd. (licensed real estate agent, Tokyo Governor (1) No. 113304). The specified-maintenance certification application, judging the work-area/equipment requirements and preparing documents for public offices are undertaken by Yotsuba Administrative Scrivener Office.

These two are each independent business entities. You engage each directly. We neither accept nor pay referral fees or introduction commissions. Incorporation registration is for a judicial scrivener, accounting and tax for a licensed tax accountant, and disputes over rent or eviction for an attorney — each engaged by you directly. Consultation is free of charge.

Frequently asked questions

Q. When is specified-maintenance certification needed?
A. When you carry out, as a business, work amounting to "specified maintenance" under Article 49, paragraph 2 of the Road Transport Vehicle Act. Besides the traditional disassembly maintenance (maintenance involving disassembly of the engine, power-transmission, running, steering, braking, buffer and coupling devices), the amendment in force 1 April 2020 added "electronic-control-device maintenance" — removing and calibrating (aiming) the cameras and radar of automated driving devices and collision-damage-mitigation brakes. Whether it applies varies by the work, so confirm with the Transport Branch Office before you start.

Q. Besides the work area, how many mechanics does certification need?
A. Including the maintenance supervisor, two or more employees engaged in specified maintenance are required. A set proportion must be qualified automobile mechanics — as a guide, 1 for 2–4 workers, 2 for 5–8, 3 for 9–12. The maintenance supervisor is in principle appointed from Class 1 or Class 2 automobile mechanics (excluding Class 2 chassis mechanics where the engine is a target). Confirm the human requirements with the Transport Branch Office.

Q. Can I lease an empty warehouse in a residential district and make it a workshop?
A. It depends on the use-zone. An auto repair shop may be built only in limited zones under Table 2 of the Building Standards Act, and not in Cat. 1/2 low-rise or residential-exclusive zones. As a guide, quasi-residential allows total work-area floor area ≤150㎡, neighbourhood commercial/commercial/quasi-industrial ≤300㎡, and industrial/exclusive-industrial no limit. A use-change from a warehouse may need a building-confirmation application. Confirm the zone and the building's history before signing.

Q. How do you choose the property between a certified workshop and a designated workshop (private inspection station)?
A. A certified workshop brings the maintained vehicle to the Transport Branch inspection lane. A designated workshop (Art. 94-2) needs, on top of the certified-workshop requirements, a completion inspection bay, inspection machinery and an automobile inspector, and completes the inspection in-house. A designated workshop needs a larger site, ceiling height and investment, so the usual order is to choose the property as a certified workshop first and aim for a designated workshop as the business grows. Deciding the target at the property-selection stage reduces rework.

Sources (primary)

• e-Gov "道路運送車両法" (Road Transport Vehicle Act) — Act No. 185 of 1951. Art. 49 (2) (definition of specified maintenance); Art. 78 (1) (certification of the specified-maintenance business by the District Transport Bureau Director); Art. 80 (standards for certification); Art. 94-2 (designated auto maintenance business / designated workshop). Accessed 31 August 2026.
• e-Gov "建築基準法" (Building Standards Act) — Act No. 201 of 1950. Art. 48 (restrictions on buildings within use-zones); Table 2 (buildings that may be built by use-zone); an auto repair shop's permitted zones split by the total floor area of the work area. Accessed 31 August 2026.
• MLIT, "Auto maintenance workshops come in certified and designated — what is the difference?" — a certified workshop is the Art. 78 certification; a designated workshop holds inspection equipment and an automobile inspector and can issue a safety-standard conformity certificate. Accessed 31 August 2026.
• MLIT and District Transport Bureaus, "Explanatory materials for obtaining specified-maintenance certification" and certification-standard guidance — the scale of the work areas is fixed by class of vehicle in the Enforcement Regulation's tables. Guide for passenger ordinary / four-wheel light-standard vehicles: vehicle work bay and inspection bay each width 4m × depth 8m, parts work area 8㎡, vehicle storage width 3m × depth 5.5m; two or more workers with 1–3 qualified mechanics by headcount; ceiling high enough for lift work; smoothly paved floor; electronic-control-device inspection area may be shared with the indoor work area. Accessed 31 August 2026.

The scale, equipment and personnel requirements vary with the class of vehicle and District Transport Bureau practice and may be amended; the figures are a guide as of the access date. Confirm with the Transport Branch Office with jurisdiction when you start. Whether an auto repair shop may be built by use-zone, and the work-area floor-area ceiling, vary with zoning, city planning, by-law add-ons and whether a use-change is needed; this article makes no determination on an individual property. This article is general information and does not judge or guarantee the suitability of a property or the grant of certification; make the final confirmation at the specified administrative agency or District Transport Bureau (Transport Branch Office). Property investigation, brokerage and the sale/lease are undertaken by Yotsuba Real Estate Co., Ltd. (licensed real estate agent), and the specified-maintenance certification application and the preparation of documents for public offices by Yotsuba Administrative Scrivener Office, each as an independent business entity engaged separately. There are no referral or introduction fees.

About the author

Joji Uramatsu — licensed real estate transaction specialist (Tokyo Governor registration No. 293544) and administrative scrivener (registration No. 25087022). Representative Director, Yotsuba Real Estate Co., Ltd. (licensed real estate agent, Tokyo Governor (1) No. 113304); principal, Yotsuba Administrative Scrivener Office. Kohinata, Bunkyo, Tokyo, about five minutes' walk from Myogadani station. Placing the property (real estate) and the certification/notification (administrative procedure) on the same table to check them together. Full profile: author page.