Go to: Profile
Go to: LEED Consulting
Go to: LEED-CI Gold certification awarded demonstrates our firm’s environmental performance


About Us

We are a professional firm of consultants, engineers and technical specialists who provide wide range of services including green building certification consulting, energy analysis, software development and evacuation safety consulting. Our mission is to contribute to the comfortable and safe society through our professional services.


In 1973, the firm started building services engineering in Maebashi, Gunma prefecture. Over 40 years, we have been offering innovative solutions as building services experts. Our services have expanded as we developed one of the first HVAC calculation package software in the industry and started the calculation services. Our third office was opened in Osaka January 2015, following to Tokyo (opened in 2007) and Takasaki (moved from Maebashi in 2007). Izumi System Planning hires 80 full time professionals (1st July 2015).

Our Services

From energy analysis to green building consultant, evacuation safety consulting and software development, we always keep in mind to provide the highest quality services.

  • LEED certification consulting
  • CASBEE®*1 certification consulting
  • Building energy analysis and regulation*2 commitment support
  • Residential Performance Evaluation System submission support
  • Long-life quality housing submission support
  • Local governments’ green building regulations*3 submission support
  • Evacuation safety verification method consulting
  • Disaster prevention plan support
  • Building services package software development and sale
  • Custom-made software development

*1: Green building certification program developed in Japan. LEED and BREEAM are often mentioned as similar programs to CASBEE.
*2: Energy Act on the Rational Use of Energy
*3: Green Building Program of Tokyo Metropolitan Government and CASBEE Municipality.

LEED Consulting

LEED, Leadership in Energy & Environmental Design, is a green building certification program developed in the US. Although Japanese counterpart CASBEE has been more popular in Japan since its establishment in 2002, the number of LEED certificated building is increasing in the last few years. Both programs have own benefits to pursue, but the main goal is the same: making society more sustainable. It is up to an owner’s marketing strategy and/or principle which program, or both programs, to carry out. Izumi System Planning Inc. earned credibility from developers, designers, engineers and reviewers, consulting 68 projects (as of February 2015) out of 288 CASBEE for Building certified*4 projects (as of 3rd July 2015, www.ibec.or.jp). It hires professionals with wide range of backgrounds – architects, building services engineers, energy analysts and environmental advisors including CASBEE APs and LEED APs. Most importantly, we are passionate about making buildings more comfortable, sustainable and valuable. CASBEE or LEED, our philosophy remains the same when we work on. LEED consulting is relatively a new business in Japan, and our firm is one of the few to provide the services. With the deep knowledge of sustainability, built environment and the construction business in Japan, we are willing to support a project team to reach its sustainability goal successfully.

*4: The figure is on certified CASBEE for Building (New Construction, Existing Building and Renovation) excluding that of CASBEE for Municipality that is enacted by prefectures and cities. We also have provided consulting services to a large number of projects.

LEED-CI Gold certification awarded demonstrates our firm’s environmental performance

Izumi System Planning Takasaki Office is located within a suburban residential area in Takasaki city, around 100km from Tokyo. The building, which was constructed in 1995, is two-story and the entire space has been leased by a single company as an office. What particularly attracts occupants is that it has a large space with at a maximum a 6m-high ceiling and allows them to feel a sense of openness due to its open-plan.

Prior to the renovation, it had already been awarded rank S (Excellent) under CASBEE for Market Promotion and Four-star Grade under BELS (the Japanese Building Energy-efficiency Labeling System), which shows that it was demonstrated to be environment-friendly to some extent by using these domestic rating systems. As a next step, taking the renewal into consideration, it was designed and built with the goal of being designated a Gold certification under the LEED-CI rating system in order to confirm the environmental performance through the international assessment tool.

<Sustainable Attempts for LEED>
1. Replacement of all the old fixtures and fittings installed in the lavatories with water-efficient ones to increase water efficiency
2. Use of FSC-certified wood for the reception space's decorative wall, expecting this attempt to contribute to conservation of forest and an encouragement of forest management
3. Selection of Energy Star qualified equipment for PC monitors
4. Selection of native plants for the required amount of vegetation in this building site. Those native plants grow so naturally with paying less attention from people that we need to use neither potable water nor a specific irrigation system to maintain them
5. The long-term commitment to the tenant lease agreement
6. Installation of LEDs: apart from a few lightings already installed in a couple of rooms, all of the lightings (both existing and added ones) are LEDs
7. Utilizing daylight: Office space occupying the largest area is designed to use daylight as much as possible through the initial illuminance correction and daylight responsive controls
8. Installation of occupancy sensors: lightings in the spaces regarded as non-regularly occupied ones like lavatories are controlled by occupancy sensors, which contributes to a reduction of the connected lighting load

#1 Exterior
Exterior view: Reception Space can be seen through glass glazing, which highlights one of the features of this building’s sustainable design.

#2 Entrance Hall
Entrance Hall, welcoming guests with warmness by wooden materials

#3 Reception Space
Reception Space covered with FSC-certified wooden louvers on the wall is designed to be a symbolic space of the office. In addition, in terms of functional usage, the wooden louvers can be used as flexible shelves by inserting panels between louvers.

#4 Creative Space
Creative Space gives employees many opportunities to have a talk and exchange ideas with each other.


4F iidabashi masumoto Building 1-21, agebachou
shinjyuku-ku, Tokyo 162-0824

E-mail: izumi-tk01@izumi-system-tk.co.jp