CASBEE Accredited Professional for Buildings

1. Research the CASBEE system: Familiarize yourself with the CASBEE framework, its family of tools (New Construction, Existing Buildings, Renovation, etc.), and the assessment criteria by reviewing the English-language manuals available on the IBEC website.

1. Confirm eligibility: Check with IBEC/JSBC for any prerequisites — typically a background in architecture, engineering, or building-related fields is expected, though formal prerequisites may vary by exam cycle.

1. Register for an authorized training course: Enroll in the CASBEE AP training course offered or authorized by IBEC/JSBC. These courses are primarily conducted in Japanese and cover the CASBEE assessment methodology, scoring, and application to different building types.

1. Complete the training: Attend the instructor-led training sessions (typically in-person in Japan), which cover CASBEE criteria, the BEE (Built Environment Efficiency) scoring concept, and practical application exercises.

1. Apply for the accreditation examination: Submit your application to IBEC/JSBC for the examination, which is held on a scheduled cycle. Confirm the current application window, fees, and exam date directly with IBEC.

1. Sit the accreditation exam: Take the in-person written examination, which tests your knowledge of CASBEE assessment criteria, scoring methodology, and application across building types including new construction, existing buildings, and renovation.

1. Receive your credential: Upon passing, you will be registered as a CASBEE Accredited Professional for Buildings by IBEC/JSBC and listed in the official registry.

1. Maintain your credential: Complete any required continuing education or refresher training within the renewal cycle (approximately every 3 years) to keep your AP status current.

The CASBEE AP for Buildings examination assesses candidates' knowledge and practical understanding of the CASBEE (Comprehensive Assessment System for Built Environment Efficiency) framework and its application to real building projects. The assessment is organized around the core conceptual structure of CASBEE, which evaluates buildings using the BEE (Built Environment Efficiency) index — a ratio of Building Environmental Quality (Q) to Building Environmental Load (L).

Building Environmental Quality (Q) covers three major categories: Q1 Indoor Environment (thermal comfort, acoustic environment, lighting/illumination, and air quality), Q2 Quality of Services (functionality, durability, flexibility, and disaster response), and Q3 Outdoor Environment on Site (preservation of natural features, townscape, and local character). Candidates must understand how each sub-criterion is scored on a 1–5 scale and how scores are aggregated.

Building Environmental Load (L) also covers three categories: L1 Energy (energy consumption and CO₂ emissions), L2 Resources & Materials (water consumption, materials use, and waste management), and L3 Off-Site Environment (air pollution, noise, vibration, odor, and sunlight obstruction). Candidates are expected to understand how load reduction contributes to a higher BEE score.

The exam also tests knowledge of the different CASBEE tools within the family — including CASBEE for Buildings (New Construction), Existing Buildings, and Renovation — as well as the certification process, documentation requirements, and how CASBEE ratings (S, A, B+, B−, C) are determined and communicated. Practical application scenarios may be included to assess candidates' ability to apply the framework to real building cases.

CASBEE is Japan's primary national green building rating system and holds a dominant position in the Japanese market, where it is mandated or incentivized by numerous local governments and national agencies including the Ministry of Land, Infrastructure, Transport and Tourism (MLIT). Since its launch in 2001, it has been adopted across thousands of buildings in Japan, and the CASBEE AP credential is widely recognized by major Japanese construction firms such as Shimizu, Kajima, Obayashi, and Takenaka. For professionals working in Japan's built environment sector, the CASBEE AP is a practical and career-relevant credential, particularly for those involved in public procurement or large-scale commercial development where CASBEE assessment may be required.

Internationally, CASBEE has limited penetration. While IBEC certified its first international building in Tianjin, China in 2014, and released a pilot version of CASBEE for Cities for worldwide use in 2015, the system has not achieved significant global adoption. In the international market, LEED (US Green Building Council) and BREEAM (BRE Group) dominate, with LEED AP and BREEAM AP credentials being far more portable across geographies. For Japanese professionals working on domestic projects, CASBEE AP is often more directly applicable than LEED AP, but those with international ambitions may need to supplement it with a globally recognized credential.

Demand for CASBEE AP professionals is tied to Japan's ongoing commitment to carbon neutrality by 2050 and its ZEB (Zero Energy Building) policy targets. The Japanese government's push for energy-efficient buildings and green public procurement continues to drive relevance for CASBEE-trained professionals. However, the credential's reach is structurally limited by the Japanese-language delivery of training and exams, making it inaccessible to most non-Japanese speakers. The total number of certified holders is estimated in the low thousands, reflecting the credential's niche but important role within the Japanese construction ecosystem.

CASBEE (Comprehensive Assessment System for Built Environment Efficiency) was developed by a research committee established in 2001 under the Japan Sustainable Building Consortium (JSBC) and the Institute for Building Environment and Energy Conservation (IBEC), with support from Japan's Ministry of Land, Infrastructure, Transport and Tourism (MLIT). The system was created in response to growing international momentum for green building standards — including the emergence of LEED in the US and BREEAM in the UK — and Japan's need for a nationally tailored framework that reflected its unique building typologies, climate conditions, and regulatory environment. The first version of CASBEE for New Construction was released in 2002, followed by tools for existing buildings, renovation, and urban development in subsequent years.

The CASBEE Accredited Professional (AP) credential was established around 2004 to create a recognized class of professionals trained to apply the CASBEE assessment tools correctly and consistently. Over the years, CASBEE has expanded into a broad "family" of tools covering schools, detached houses, commercial interiors, heat island assessment, urban development, and cities. A pilot version of CASBEE for Cities for worldwide use was announced at COP21 in December 2015, signaling ambitions for international relevance. The most recent major update, the 2024 edition of CASBEE for Buildings (New Construction), was released in September 2025 in English, reflecting ongoing efforts to keep the system current with evolving sustainability science and policy requirements.