Translation
The following is an English translation of an independent assurance report prepared in Japanese and is for information andreference purposes only. In the event of a discrepancy between the Japanese and English versions, the Japanese version willprevail.

Independent practitioner’s assurance report

Mr. Yoshiro Aikawa
President and Chief Executive Officer,
Representative Director
Taisei Corporation
Scope
We have been engaged by Taisei Corporation. (hereafter the “Company”) to perform a ‘limited
assurance engagement,’ as defined by International Standards on Assurance Engagements,
hereafter referred to as the engagement, to report on the Company’s environment data andindices (the “Subject Matter”) contained in the Company, TAISEI ROTEC CORPORATION,TAISEI U-LEC CO.,LTD, Taisei-Yuraku Real Estate Co.,Ltd., TAISEI SETSUBI CO.,LTD.,TAISEI HOUSING CORPORATION, SEIWA RENEWAL WORKS CO.,LTD. and J-FAST Co.,
Ltd. as included in “Sustainability / Environment(E) / Environmental Data” on the Company’s
website (the “WEB information”) for the period from April 1, 2023 to March 31, 2024. The scopeof our assurance procedures was limited to the indicators marked with the symbol “ ” in theWEB information.
Criteria applied by the Company
In preparing the Subject Matter, the Company applied the Criteria, that it determined withconsideration of laws and regulations applicable to the Company as presented on theCompany's WEB information.
The Company’s responsibilities
The Company’s management is responsible for selecting the Criteria, and for presenting theSubject Matter in accordance with that Criteria, in all material respects. This responsibility
includes establishing and maintaining internal controls, maintaining adequate records andmaking estimates that are relevant to the preparation of the subject matter, such that it is freefrom material misstatement, whether due to fraud or error. Greenhouse gas (GHG) emissions
are estimated using emissions factors, and the scientific knowledge on which such emission
factors are based has not been established. GHG quantification is subject to inherent
uncertainty.
EY’s responsibilities
Our responsibility is to express a conclusion on the presentation of the Subject Matter based on
the evidence we have obtained.
We conducted our engagement in accordance with the International Standard for Assurance
Engagements Other Than Audits or Reviews of Historical Financial Information (‘ISAE 3000(Revised)’) and with respect to GHG emissions, the International Standard on Assurance
Engagements: Assurance Engagements on Greenhouse Gas Statements (“ISAE 3410”), issued
by the International Auditing and Assurance Standards Board, the terms of reference for this1

engagement as agreed with the Company on February 26, 2024 and amendment agreement asagreed with the Company on July 19, 2024. Those standards require that we plan and perform
our engagement to express a conclusion on whether we are aware of any material modifications
that need to be made to the Subject Matter in order for it to be in accordance with the Criteria,
and to issue a report. The nature, timing, and extent of the procedures selected depend on ourjudgment, including an assessment of the risk of material misstatement, whether due to fraud orerror.
We believe that the evidence obtained is sufficient and appropriate to provide a basis for ourlimited assurance conclusions.
Our independence and quality management
We have maintained our independence and confirm that we have met the requirements of theCode of Ethics for Professional Accountants issued by the International Ethics Standards Board
for Accountants and have the required competencies and experience to conduct this assurance
engagement.
EY also applies International Standard on Quality Management 1, Quality Management for
Firms that Perform Audits or Reviews of Financial Statements, or Other Assurance or Related
Services engagements, which requires that we design, implement and operate a system ofquality management including policies or procedures regarding compliance with ethicalrequirements, professional standards and applicable legal and regulatory requirements.
Description of procedures performed
Procedures performed in a limited assurance engagement vary in nature and timing from, andare less in extent than for a reasonable assurance engagement. Consequently, the level ofassurance obtained in a limited assurance engagement is substantially lower than theassurance that would have been obtained had a reasonable assurance engagement been
performed. Our procedures were designed to obtain a limited level of assurance on which tobase our conclusion and do not provide all the evidence that would be required to provide a
reasonable level of assurance.
Although we considered the effectiveness of management’s internal controls when determining
the nature and extent of our procedures, our assurance engagement was not designed toprovide assurance on internal controls. Our procedures did not include testing controls orperforming procedures relating to checking aggregation or calculation of data within IT systems.
A limited assurance engagement consists of making enquiries, primarily of persons responsible
for preparing the Subject Matter and related information, and applying analytical and otherappropriate procedures.
Our procedures included:

・ Making enquiries regarding the Company’s own criteria that it determined withconsideration of laws and regulations applicable to the Company, and evaluating theappropriateness thereof;・ Inspecting relevant documents with regard to the design of the Company’s internalcontrols related to the Subject Matter, and enquiring of personnel responsible thereof atthe headquarter and sites visited (Taisei Corporation Construction Site of Tokyo
2

Branch, TAISEI ROTEC CORPORATION Work Office of Tohoku Branch and TAISEIROTEC CORPORATION Plant of Higashi-Kanto Branch);・ Performing analytical procedures concerning the Subject Matter at the headquarter andsites visited (Taisei Corporation Construction Site of Tokyo Branch, TAISEI ROTECCORPORATION Work Office of Tohoku Branch and TAISEI ROTEC CORPORATION
Plant of Higashi-Kanto Branch); and・ Testing, on a sample basis, underlying source information, matching indicators with theevidence and conducting relevant re-calculations at the headquarter and sites visited(Taisei Corporation Construction Site of Tokyo Branch, TAISEI ROTECCORPORATION Work Office of Tohoku Branch and TAISEI ROTEC CORPORATION
Plant of Higashi-Kanto Branch).
We also performed such other procedures as we considered necessary in the circumstances.
Conclusion
Based on our procedures and the evidence obtained, we are not aware of any material
modifications that should be made to the Subject Matter for the period from April 1, 2023 toMarch 31, 2024 in order for it to be in accordance with the Criteria.

Kenji Sawami
Kiyotaka Kinugawa
Shuhei Okuma
Engagement Partners
July 31, 2024
Ernst & Young ShinNihon LLC
Tokyo, Japan3