Head Office / Tokyo
Head Office
4-18-21 Minami-Aoyama,Minato-ku, Tokyo 107-0062
TEL +81-3-6434-9201
Moved in August 2026
Company
会社概要
We founded the company in 1997 as an air conditioning and ventilation contractor. Today we take on electrical work and mechanical work together as a single contract, under Special Construction Business Licenses for both pipe work and electrical work.
Message
私たちから
To everyone who has taken an interest in our company: let us tell you a little about what matters to us.
From the customer’s point of view,
to be Japan’s number-one building services contractor.
SOWA SERVICE started in 1997 with air conditioning skills and a single vehicle. We go to our customers and provide service on site. That is still where we come from.
We go where we are called and finish each job we are given, one at a time. Through that repetition, we have kept learning the right knowledge and methods for customers we have not yet met.
The turning point was the renovation of a large shopping center in Shiga, with a total floor area of about 100,000 m². We were entrusted with all of the air conditioning, ventilation and smoke exhaust ductwork, a project on a scale we had never handled before.
To be honest, we had our doubts. But on the job site, we, and the contractors working with us, were all there because we had been chosen. So we decided to do everything we could. That decision has made us who we are today.
Inside the ceiling, on the drawings, during test runs: we stop and ask, “Is this really right?” We share what we notice and redo the work when needed. Work finished this way has led to the next request.
If we choose the easy way, the extra work comes back to us later. So when in doubt, we choose the way that takes a little more effort. Standardizing procedures and making rules are how we build a footing to keep doing good work tomorrow.
Each time a customer asked, “Could you also help with this?”, we were able to do a little more. Today, we believe we have become a company people come to first for building services work.
There are three phrases we hold on to. Never let the work become dull. Give each day your best. If something seems wrong, speak up. Because we love this work, we notice the small details. We want to build carefully, even the parts our customers will never see.
Our goal is to be “Japan’s number-one building services contractor, from the customer’s point of view.” But we do not think number one is something you can call yourself. It means hearing a customer say, “We want to ask you.” For those words, we will keep giving our full attention to each job site.
SOWA SERVICE Co., Ltd.All of our staff

Profile
会社情報
Licenses and registrations are listed exactly as issued, so you can check them before doing business with us.
Offices
拠点
From our two locations in Tokyo and Nagoya, we serve job sites in the Greater Tokyo and Chubu regions and across Japan.
Head Office / Tokyo
TEL +81-3-6434-9201
Moved in August 2026
Branch / Nagoya
Installation and maintenance base for the Chubu region
Warehouse / Setagaya
View on Google Maps (Setagaya Warehouse, opens in a new tab)
Dormitory / Kugayama
View on Google Maps (Kugayama Dormitory, opens in a new tab)
Based in Tokyo and Nagoya, we have carried out work in about 20 prefectures across Japan.Prefectures where we have worked
Philosophy
理念・行動指針
The ideas that our company and group value.
Our Belief
Unless we are truly committed,
we cannot make our customers happy.
From our company brochure
Group Philosophy
We help people build “a rich life” through their work.
SOWA Group philosophy (from our company brochure)
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History
沿革
Starting with air conditioning and ventilation, we moved into plumbing and then electrical work, expanding the range and scale of our work step by step.
Takashi Wago founded the company as an air conditioning and ventilation contractor.
Able to handle everything from equipment and materials sales to installation.
Handled fabrication, delivery and construction management of positive pressure systems at four nuclear emergency off-site centers in Fukui Prefecture.
Set up a system for 3D shop drawings and coordination studies.
Began taking on hotel and hospital projects.
Won a full contract for air conditioning and fire and life safety (smoke control) work in a large shopping center in Shiga Prefecture (total floor area about 100,000 m²).
Became part of the SOWA HOLDINGS Co., Ltd. group.
Became SOWA SERVICE Co., Ltd.
Able to take on pipe and electrical work together under Special Construction Business Licenses for both.
Took on all air conditioning work in a new shopping mall with about 30 tenants.
Full renovation of the air conditioning and electrical systems of a hotel in Kariya, Aichi.
SOWA Group
SOWAグループ
The SOWA Group consists of the following four companies.
Building services design is done together with SEDS, our group company.
Contact
ご用件から選ぶ
A staff member will review your message and get back to you. For urgent breakdowns, please call us.
Estimate
Building services work for new construction or renovation. You can attach drawings and site photos.
Request a quotationRepair
Air conditioning stopped, or a water leak? We also handle equipment installed by other companies.
Request a repairPartner
We are looking for tradespeople and specialty contractors to build job sites with us.
RegisterSOWA HOLDINGS Co., Ltd.Operating holding company of the SOWA Group
SEDSBuilding services design
KD WORK Co., Ltd.Electrical work specialist