Sprinkler Systems
Installation, modification and renewal of sprinkler systems for offices, residential buildings, commercial facilities, factories, warehouses and other buildings.
Japanese Fire Protection Contractor · Greater Tokyo
Fire Protection & Sprinkler Contractor in Tokyo, Japan
SP Mizukoshi specialises in sprinkler systems and fire protection piping, with construction management, construction drawings and coordination related to local fire authorities across the Greater Tokyo area.
- Established 2001
- Licensed in Japan
- Tokyo · Kanagawa · Chiba · Saitama
- Tokyo & Yokohama Operations
Established 2001Approx. 25 years in fire protection
Licensed in JapanFire Protection Facility Construction
Greater Tokyo CoverageTokyo · Kanagawa · Chiba · Saitama
Project SupportDrawings · Management · Fire authority coordination
For International Companies
A Local Fire Protection Partner for Projects in Japan
If your company is planning a construction, renovation or facility project in Japan and requires a local fire protection contractor, SP Mizukoshi can support projects in Tokyo and the Greater Tokyo area.
Practical support for fire protection work in Japan
We work on sprinkler and fire protection piping for new construction, renovation and modification projects. Depending on the project scope, we can also support construction drawings, site management, coordination with other trades, and documentation or coordination related to Japanese fire authorities.
Our priority is not to present ourselves as an overseas contractor. We are a Japan-based specialist supporting companies that need reliable local fire protection work for projects carried out in Japan.
English-language project enquiries are welcome. Written communication by email is preferred. Translation tools may be used when appropriate so that technical details can be confirmed accurately.
Fire Protection Services
Sprinkler, Fire Protection Piping & Project Support
Our work centres on fire suppression systems and piping, with support from construction planning through site completion.
Fire Protection Piping
Fire suppression piping, sprinkler piping, route coordination, replacement and modification work associated with building construction or renovation.
Indoor Fire Hydrant Systems
Installation and modification of indoor fire hydrant systems used for first-response firefighting within buildings.
Fire Department Connection / Standpipe Systems
Work related to Japan's Renketsu Sosuikan systems, which provide dedicated piping and fire-service inlets/outlets for firefighting operations in buildings.
Foam Fire Suppression Systems
Construction and modification of foam-based fire suppression systems used where the building or hazard classification requires this type of protection.
Fire Pumps
Fire pump-related installation and modification work, including associated piping and system coordination.
Renovation & Modification
Fire protection changes for tenant fit-outs, building renovations, layout changes, ageing systems and equipment renewal.
New Construction
Fire protection piping and sprinkler work for new buildings, coordinated with architectural, mechanical, electrical and other construction activities.
Construction Management
On-site management of quality, safety, schedule, coordination and execution for fire protection works.
Construction Drawings
Preparation and coordination of detailed construction drawings for sprinkler and fire protection piping installation.
Coordination with Other Trades
Practical coordination with building services and construction trades to resolve routing, ceiling-space and installation interfaces.
Coordination with Local Fire Authorities
Support for relevant documentation, filings, inspections and communication with local fire authorities as required for the project.
From Drawings to Completion
Support Beyond Installation
Fire protection work in Japan often requires coordination between drawings, site conditions, other trades and local procedures. SP Mizukoshi can support that process as part of the project.
01Project Review
02Construction Drawings
03Trade Coordination
04Installation
05Construction Management
06Fire Authority / Completion Support
Why SP Mizukoshi
Reliability, Responsibility and Workmanship
We do not rely on exaggerated claims. Our focus is practical: safe work, responsible project management, consistent workmanship and long-term trust.
Specialised Experience
Fire protection and sprinkler work has been our core business since 2001.
New & Existing Buildings
We support both new construction and renovation or modification projects.
Site Management
We manage quality, safety, schedule and coordination as part of execution.
Drawings & Coordination
Construction drawings and coordination help turn design requirements into buildable work.
Licensed in Japan
We hold a Japanese construction business license for Fire Protection Facility Construction.
About SP Mizukoshi
A Japanese Fire Protection Specialist Since 2001
Fire protection work built on trust and responsibility
SP Mizukoshi is the English name used by Mizukoshi Setsubi, a Japanese fire protection contractor based in Yokohama. Since 2001, we have specialised in sprinkler systems, fire protection piping and related construction management.
Our work includes offices, residential buildings, factories, warehouses, commercial facilities and other projects across the Greater Tokyo area. We support both new construction and renovation, with a focus on safe execution, practical coordination and dependable workmanship.
The Tokyo Branch – Oimachi Office is scheduled to open on September 1, 2026, strengthening our operating structure for projects in Tokyo.
- Company: 有限会社 水越設備
- English name: SP Mizukoshi
- Representative: Makoto Mizukoshi
- Established: 2001
- Headquarters: Yokohama, Kanagawa
- Tokyo Branch: Oimachi Office
Licensing & Compliance
Licensed Fire Protection Construction Company in Japan
For companies appointing local contractors in Japan, clear licensing information is an important part of due diligence. Our current construction business license information is shown below.
Japanese Construction Business License
SP Mizukoshi holds a construction business license issued by the Governor of Kanagawa Prefecture for Fire Protection Facility Construction.
- ✓Sprinkler and fire protection piping works
- ✓Construction management and site coordination
- ✓Construction drawings and project documentation support
- ✓Greater Tokyo operating area from Yokohama and Tokyo
License Information
| Company | 有限会社 水越設備 / SP Mizukoshi |
|---|---|
| Authority | Governor of Kanagawa Prefecture |
| License No. | (General-6) No. 74948 |
| Licensed Trade | Fire Protection Facility Construction |
| Valid From | August 24, 2024 |
| Valid Until | August 23, 2029 |
English wording on this page is provided as an explanatory translation of the Japanese license information. The Japanese license record is the authoritative version.
Service Area
Greater Tokyo Area
Our main service area covers the Tokyo metropolitan region. Projects outside the areas below may be considered depending on scope, schedule and project requirements.
Tokyo
Tokyo 23 wards and surrounding Tokyo areas, including projects supported through our Oimachi operating base from September 1, 2026.
Kanagawa
Yokohama, Kawasaki and other areas throughout Kanagawa Prefecture, supported from our Yokohama headquarters.
Chiba
Chiba City, Funabashi, Ichikawa, Urayasu, Matsudo, Kashiwa and other areas depending on project requirements.
Saitama
Saitama City, Kawaguchi, Kawagoe, Tokorozawa, Koshigaya and other areas depending on project requirements.
Tokyo & Yokohama Operations
Local Coverage for Projects in the Greater Tokyo Area
Our Yokohama headquarters and Tokyo operating base support fire protection projects across the metropolitan region.
Yokohama Headquarters
3-79-16 Mukai-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0037, Japan.
Primary headquarters for company operations and fire protection project support.
Oimachi Office
Tokyo Branch – Oimachi Office is scheduled to open on September 1, 2026, strengthening our ability to support projects in Tokyo and the surrounding metropolitan area.
International Project FAQ
Frequently Asked Questions
Can international companies contact SP Mizukoshi directly?
Yes. International companies planning construction, renovation or facility projects in Japan are welcome to contact us regarding fire protection work in the Greater Tokyo area. Written communication by email is preferred for English-language enquiries.
Which areas do you cover?
Our main operating area includes Tokyo, Kanagawa, Chiba and Saitama. Projects outside these areas may be considered depending on the work scope, schedule and project conditions.
Can you support renovation and tenant modification projects?
Yes. We support fire protection changes associated with tenant fit-outs, renovation, layout changes, system renewal and other modifications to existing buildings.
Can you prepare construction drawings and coordinate with other trades?
Depending on the project, we can support construction drawings, route coordination, site management and coordination with other building services and construction trades.
Can you support Japanese fire authority procedures?
Depending on the project scope, we can support documentation, filings, inspections and coordination related to local fire authorities. Requirements vary by building, location and project type.
Does SP Mizukoshi hold a Japanese construction business license?
Yes. We hold Kanagawa Prefectural Governor License (General-6) No. 74948 for Fire Protection Facility Construction, valid from August 24, 2024 through August 23, 2029.
Fire Protection Project Enquiries
Planning a Project in Japan?
If your company requires a local fire protection or sprinkler contractor for a project in Tokyo or the Greater Tokyo area, please contact SP Mizukoshi. Providing the project location, building type, construction schedule and required scope will help us review your enquiry efficiently.