Limbach Holdings Inc

Index to Financial Statements

MANAGEMENT’S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING

March 10, 2025

To the Stockholders of Limbach Holdings, Inc.:

Financial Statements and Practices

The accompanying consolidated financial statements of Limbach Holdings, Inc. are the responsibility of and have been prepared by the Company’s management in conformity with accounting principles generally accepted in the United States of America. They necessarily include some amounts that are based on its best judgments and estimates. The Company’s financial information displayed in other sections of this report is consistent with these financial statements.

The Company seeks to assure the objectivity and integrity of its financial records by careful selection of its managers, by organizational arrangements that provide an appropriate division of responsibility and by communication programs aimed at assuring that its policies, procedures and methods are understood throughout the organization.

The Company has a comprehensive, formalized system of internal controls designed to provide reasonable assurance that assets are safeguarded, that financial records are reliable and that information required to be disclosed in reports filed with or submitted to the Securities and Exchange Commission is recorded, processed, summarized and reported within the required time limits. Appropriate members of management monitor the system for compliance and evaluates it for effectiveness, and the independent registered public accounting firm measures its effectiveness and recommends possible improvements thereto.

The Board of Directors exercises its oversight role in the area of financial reporting and internal control over financial reporting through its Audit Committee. This committee, composed solely of independent directors, regularly meets (jointly and separately) with the independent registered public accounting firm, management, internal audit and other executives to monitor the proper discharge by each of their responsibilities relative to internal control over financial reporting and the Company’s financial statements.

Internal Control Over Financial Reporting

The Company’s management is responsible for establishing and maintaining adequate internal control over financial reporting, as defined in Exchange Act Rule 13a-15(f). Under the supervision and with the participation of the Company’s management, including the President and Chief Executive Officer and Executive Vice President and Chief Financial Officer, the Company conducted an evaluation of the effectiveness of its internal control over financial reporting based on the framework in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. On September 3, 2024, the Company acquired all of the outstanding membership interests of Kent Island Mechanical, LLC. Additionally, on December 2, 2024, the Company acquired all of the outstanding membership interests of Consolidated Mechanical, LLC. As the acquisitions occurred in September 2024 and December 2024, the scope of the Company's assessment of the design and operating effectiveness of the Company’s internal control over financial reporting for the year ended December 31, 2024 excluded these acquired businesses. The total assets and total revenue excluded from the Company’s assessment represented approximately 11% and 3%, respectively, of Limbach Holdings, Inc.’s consolidated total assets and total revenue as of and for the year ended December 31, 2024. This exclusion is in accordance with the SEC’s staff guidance that an assessment of a recently acquired business may be omitted from the scope of the Company's evaluation of the effectiveness of its internal controls in the year of acquisition. These acquired businesses will be included in management’s assessment of the effectiveness of the Company’s internal controls over financial reporting as of December 31, 2025.

Based on this evaluation, the Company’s management concluded that Limbach Holdings, Inc.’s internal control over financial reporting was effective as of December 31, 2024.

The effectiveness of the Company’s internal control over financial reporting as of December 31, 2024 has been audited by Crowe LLP, an independent registered public accounting firm, as stated in their report which is included herein.