Basis of Presentation	9 Months Ended
Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	1. Basis of Presentation Builders FirstSource, Inc., a Delaware corporation formed in 1998, is a leading supplier of building materials, manufactured components and construction services to professional contractors, sub-contractors, and consumers. The Company operates approximately 585 locations in 43 states across the United States. In this quarterly report, references to the “Company,” “we,” “our,” “ours” or “us” refer to Builders FirstSource, Inc. and its consolidated subsidiaries unless otherwise stated or the context otherwise requires. In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all recurring adjustments and normal accruals necessary for a fair statement of the Company’s financial position, results of operations and cash flows for the dates and periods presented. Results for interim periods are not necessarily indicative of the results to be expected during the remainder of the current year or for any future period. Intercompany transactions are eliminated in consolidation. The Condensed Consolidated Balance Sheet as of December 31, 2024, is derived from the audited consolidated financial statements but does not include all disclosures required by Generally Accepted Accounting Principles in the United States of America (“GAAP”). The Condensed Consolidated Balance Sheet as of December 31, 2024, and the unaudited condensed consolidated financial statements included herein should be read in conjunction with the more detailed audited consolidated financial statements for the year ended December 31, 2024, included in our most recent annual report on Form 10-K for fiscal year 2024 (“2024 Form 10-K”). Accounting policies used in the preparation of these unaudited condensed consolidated financial statements are consistent with the accounting policies described in the Notes to Consolidated Financial Statements included in our 2024 Form 10-K. Business Combinations When they meet the requirements under ASC 805, Business Combinations, merger and acquisition transactions are accounted for using the acquisition method, and accordingly the results of operations of the acquiree are included in the Company’s consolidated financial statements from the acquisition date. The consideration transferred is allocated to the identifiable assets acquired and liabilities assumed based on estimated fair values at the acquisition date, with any excess recorded as goodwill. Transaction-related costs are expensed in the period the costs are incurred. During the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed with the corresponding adjustment to goodwill. Segments We offer an integrated solution to our customers providing manufacturing, supply, and installation of a full range of structural and related building products. Given the span and depth of our geographical reach, our locations are organized into three geographical divisions (East, Central, and West), which are also our operating segments. All of our operating segments have similar customers, products and services, and distribution methods. Due to these similarities, along with the similar economic profitability achieved across all our operating segments, we aggregate our three operating segments into one reportable segment in accordance with GAAP. Centralized financial and operational oversight, including resource allocation and assessment of performance, is performed by our principal executive officer (“CEO”), whom we have determined to be our chief operating decision maker (“CODM”). Since the Company operates in one reportable segment, the primary measures reviewed by our CEO, including revenue, gross margin and income before income taxes, are shown in these condensed consolidated financial statements. The accounting policies of our reportable segment are consistent with the accounting policies described in the Notes to Consolidated Financial Statements included in our 2024 Form 10-K. Cloud Computing Arrangements We assess cloud computing arrangements to determine whether the contract meets the definition of a service contract or conveys a software license. When cloud computing arrangements meet the definition of a service contract, we capitalize expenditures for implementation, set-up, and other upfront costs incurred. Once the implementation of a cloud computing arrangement is complete and ready for its intended use, we amortize the costs over the expected term of the hosting arrangement using the straight-line method to the same income statement line as the associated cloud operating expenses. As of September 30, 2025, and December 31, 2024, we had capitalized costs, net of amortization, of $20.8 million and $9.3 million, respectively, included in other current assets. As of September 30, 2025, and December 31, 2024, we had capitalized costs, net of amortization, of $81.8 million and $52.7 million, respectively, included in other assets, net. During the three and nine months ended September 30, 2025, we amortized $4.8 million for these costs. During the three and nine months ended September 30, 2024, we amortized $0.3 million and $1.0 million for these costs, respectively. The amortized expenses are included in selling, general and administrative expenses within the Condensed Consolidated Statements of Operations. Comprehensive Income Comprehensive income is equal to net income for all periods presented. Equity Investments The Company’s equity investments are accounted for using equity method accounting and are recorded as other assets, net in the accompanying Condensed Consolidated Balance Sheets and are not considered significant to the Company. Reclassifications The prior period amounts disclosed in Note 3 have been reclassified to conform to current year presentation. These reclassifications had no impact on net income, total assets and liabilities, stockholders’ equity or cashflows as previously reported. Recent Accounting Pronouncements In December 2023, the Financial Accounting Standards Board (“FASB”) issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which is intended to enhance the transparency and decision usefulness of income tax disclosures. This amendment modifies the rules on income tax disclosures to require entities to disclose: (i) specific categories in the rate reconciliation and additional information for reconciling items that meet a quantitative threshold; (ii) the amount of income taxes paid (net of refunds received) disaggregated by federal, state, and foreign taxes, as well as individual jurisdictions in which income taxes paid is equal to or greater than five percent of total income taxes paid net of refunds; (iii) the income or loss from continuing operations before income tax expense, or benefit, disaggregated between domestic and foreign; and (iv) income tax expense or benefit from continuing operations disaggregated by federal, state and foreign. The guidance is effective for annual periods beginning after December 15, 2024, with early adoption permitted, and should be applied on a prospective basis, though retrospective application is permitted. The adoption of this guidance is not expected to have a material impact on our consolidated financial statements and we will reflect the related disclosure requirements within our 2025 Annual Report on Form 10-K. In November 2024, the FASB issued ASU No. 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (“ASU 2024-03”), and in January 2025, the FASB issued Accounting Standards Update No. 2025-01, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date (“ASU 2025-01”). ASU 2024-03 requires additional disclosure of the nature of expenses included in the income statement as well as disclosures about specific types of expenses included in the expense captions presented in the income statement. ASU 2024-03, as clarified by ASU 2025-01, is effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods within annual reporting periods beginning after December 15, 2027. The requirements will be applied prospectively with the option for retrospective application and early adoption is permitted. We are currently evaluating the potential impact of adopting this new guidance on our consolidated financial statements and related disclosures. In September 2025, the FASB issued ASU No. 2025-06, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. The standard applies to costs incurred to develop or obtain software for internal use. ASU 2025-06 amends the existing standard that refers to various stages of a software development project to align better with current software development methods, such as agile programming. Under the new standard, entities will commence capitalizing eligible costs when (i) management has authorized and committed to funding the software project and (ii) it is probable that the project will be completed and the software will be used to perform the function intended. The amendments in ASU 2025-06 are effective for annual reporting periods beginning after December 15, 2027, and interim reporting periods, with early adoption permitted. We are currently evaluating the potential impact of adopting this new guidance on our consolidated financial statements and related disclosures.

Basis of Presentation

9 Months Ended

Sep. 30, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

1. Basis of Presentation

Builders FirstSource, Inc., a Delaware corporation formed in 1998, is a leading supplier of building materials, manufactured components and construction services to professional contractors, sub-contractors, and consumers. The Company operates approximately 585 locations in 43 states across the United States. In this quarterly report, references to the “Company,” “we,” “our,” “ours” or “us” refer to Builders FirstSource, Inc. and its consolidated subsidiaries unless otherwise stated or the context otherwise requires.

In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all recurring adjustments and normal accruals necessary for a fair statement of the Company’s financial position, results of operations and cash flows for the dates and periods presented. Results for interim periods are not necessarily indicative of the results to be expected during the remainder of the current year or for any future period. Intercompany transactions are eliminated in consolidation.

The Condensed Consolidated Balance Sheet as of December 31, 2024, is derived from the audited consolidated financial statements but does not include all disclosures required by Generally Accepted Accounting Principles in the United States of America (“GAAP”). The Condensed Consolidated Balance Sheet as of December 31, 2024, and the unaudited condensed consolidated financial statements included herein should be read in conjunction with the more detailed audited consolidated financial statements for the year ended December 31, 2024, included in our most recent annual report on Form 10-K for fiscal year 2024 (“2024 Form 10-K”). Accounting policies used in the preparation of these unaudited condensed consolidated financial statements are consistent with the accounting policies described in the Notes to Consolidated Financial Statements included in our 2024 Form 10-K.

Business Combinations

When they meet the requirements under ASC 805, Business Combinations, merger and acquisition transactions are accounted for using the acquisition method, and accordingly the results of operations of the acquiree are included in the Company’s consolidated financial statements from the acquisition date. The consideration transferred is allocated to the identifiable assets acquired and liabilities assumed based on estimated fair values at the acquisition date, with any excess recorded as goodwill. Transaction-related costs are expensed in the period the costs are incurred. During the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed with the corresponding adjustment to goodwill.

Segments

We offer an integrated solution to our customers providing manufacturing, supply, and installation of a full range of structural and related building products. Given the span and depth of our geographical reach, our locations are organized into three geographical divisions (East, Central, and West), which are also our operating segments. All of our operating segments have similar customers, products and services, and distribution methods.

Due to these similarities, along with the similar economic profitability achieved across all our operating segments, we aggregate our three operating segments into one reportable segment in accordance with GAAP. Centralized financial and operational oversight, including resource allocation and assessment of performance, is performed by our principal executive officer (“CEO”), whom we have determined to be our chief operating decision maker (“CODM”). Since the Company operates in one reportable segment, the primary measures reviewed by our CEO, including revenue, gross margin and income before income taxes, are shown in these condensed consolidated financial statements.

The accounting policies of our reportable segment are consistent with the accounting policies described in the Notes to Consolidated Financial Statements included in our 2024 Form 10-K.

Cloud Computing Arrangements

We assess cloud computing arrangements to determine whether the contract meets the definition of a service contract or conveys a software license. When cloud computing arrangements meet the definition of a service contract, we capitalize expenditures for implementation, set-up, and other upfront costs incurred. Once the implementation of a cloud computing arrangement is complete and ready for its intended use, we amortize the costs over the expected term of the hosting arrangement using the straight-line method to the same income statement line as the associated cloud operating expenses. As of September 30, 2025, and December 31, 2024, we had capitalized costs, net of amortization, of $20.8 million and $9.3 million, respectively, included in other current assets. As of September 30, 2025, and December 31, 2024, we had capitalized costs, net of amortization, of $81.8 million and $52.7 million, respectively, included in other assets, net. During the three and nine months ended September 30, 2025, we amortized $4.8 million for these costs. During the three and nine months ended September 30, 2024, we amortized $0.3 million and $1.0 million for these costs,

respectively. The amortized expenses are included in selling, general and administrative expenses within the Condensed Consolidated Statements of Operations.

Comprehensive Income

Comprehensive income is equal to net income for all periods presented.

Equity Investments

The Company’s equity investments are accounted for using equity method accounting and are recorded as other assets, net in the accompanying Condensed Consolidated Balance Sheets and are not considered significant to the Company.

Reclassifications

The prior period amounts disclosed in Note 3 have been reclassified to conform to current year presentation. These reclassifications had no impact on net income, total assets and liabilities, stockholders’ equity or cashflows as previously reported.

Recent Accounting Pronouncements

In December 2023, the Financial Accounting Standards Board (“FASB”) issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which is intended to enhance the transparency and decision usefulness of income tax disclosures. This amendment modifies the rules on income tax disclosures to require entities to disclose: (i) specific categories in the rate reconciliation and additional information for reconciling items that meet a quantitative threshold; (ii) the amount of income taxes paid (net of refunds received) disaggregated by federal, state, and foreign taxes, as well as individual jurisdictions in which income taxes paid is equal to or greater than five percent of total income taxes paid net of refunds; (iii) the income or loss from continuing operations before income tax expense, or benefit, disaggregated between domestic and foreign; and (iv) income tax expense or benefit from continuing operations disaggregated by federal, state and foreign. The guidance is effective for annual periods beginning after December 15, 2024, with early adoption permitted, and should be applied on a prospective basis, though retrospective application is permitted. The adoption of this guidance is not expected to have a material impact on our consolidated financial statements and we will reflect the related disclosure requirements within our 2025 Annual Report on Form 10-K.

In November 2024, the FASB issued ASU No. 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (“ASU 2024-03”), and in January 2025, the FASB issued Accounting Standards Update No. 2025-01, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date (“ASU 2025-01”). ASU 2024-03 requires additional disclosure of the nature of expenses included in the income statement as well as disclosures about specific types of expenses included in the expense captions presented in the income statement. ASU 2024-03, as clarified by ASU 2025-01, is effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods within annual reporting periods beginning after December 15, 2027. The requirements will be applied prospectively with the option for retrospective application and early adoption is permitted. We are currently evaluating the potential impact of adopting this new guidance on our consolidated financial statements and related disclosures.

In September 2025, the FASB issued ASU No. 2025-06, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. The standard applies to costs incurred to develop or obtain software for internal use. ASU 2025-06 amends the existing standard that refers to various stages of a software development project to align better with current software development methods, such as agile programming. Under the new standard, entities will commence capitalizing eligible costs when (i) management has authorized and committed to funding the software project and (ii) it is probable that the project will be completed and the software will be used to perform the function intended. The amendments in ASU 2025-06 are effective for annual reporting periods beginning after December 15, 2027, and interim reporting periods, with early adoption permitted. We are currently evaluating the potential impact of adopting this new guidance on our consolidated financial statements and related disclosures.