Builders Firstsource, Inc. (BLDR) SEC Filing 10-K Annual report for the fiscal year ending Sunday, December 31, 2017

Exhibit 99.1

For Immediate Release

Builders FirstSource Reports Fourth Quarter and Fiscal 2017 Results

Financial highlights include sales and earnings growth with debt reduction and capital structure improvement

February 28, 2018 (Dallas, TX) – Builders FirstSource, Inc. (NasdaqGS: BLDR)

Commenting on fourth quarter results, CEO Chad Crow remarked, “I am pleased to report we had a strong finish to the year, growing sales per day, excluding closed locations, by 13.2 percent in the fourth quarter. We saw an increase in sales volume in the single family construction end market of 7.5 percent, and 5.2 percent in the repair and remodeling / other end market. Additionally, we saw growth in manufactured products of 11.3 percent.

“We are leveraging our platform strengths to deliver sales growth and strong financial results while executing on our strategic priorities and investing in our future. We continued our investments in manufacturing capacity and talent to drive enhanced growth in margin-accretive products and markets, while making further progress in paying down debt and reducing our leverage ratio on a year over year basis.”

Peter Jackson, CFO, added, “In the quarter, we further refined our capital structure by redeeming our most expensive debt, the 10.75% unsecured notes, reducing go forward interest expense by $35 million annually. I am very pleased with the progress we are making on de-leveraging, as we reduced our leverage ratio by 0.6 times year over year to 4.2 times. Cash flow generation and debt reduction will continue to be a priority for 2018, as we execute on our multi-year plan to de-lever the balance sheet and fund growth initiatives.”

The Company has provided supplemental non-GAAP financial information of the consolidated company that is adjusted to exclude one-time integration, facility closure, one-time refinancing, non-cash release of tax valuation allowance and revaluation of deferred taxes, and other costs (“Adjusted”). As the information below includes non-GAAP financial information, please refer to the accompanying financial schedules for non-GAAP reconciliations to their GAAP equivalents.

Fourth Quarter 2017 Compared to Fourth Quarter 2016:

Net Sales

1