<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001306297</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001316835</issuerCik>
      <issuerName>Builders FirstSource, Inc.</issuerName>
      <secFileNumber>001-40620</secFileNumber>
      <issuerAddress>
        <com:street1>6031 CONNECTION DR., STE. 400</com:street1>
        <com:city>IRVING</com:city>
        <com:stateOrCountry>TX</com:stateOrCountry>
        <com:zipCode>75039</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>(214) 880-3500</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Boydston Cory Jacobs</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Director</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Charles Schwab &amp; Co., Inc.</name>
        <address>
          <com:street1>3000 Schwab Way</com:street1>
          <com:city>Westlake</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>76262</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>17500</noOfUnitsSold>
      <aggregateMarketValue>3500001.00</aggregateMarketValue>
      <noOfUnitsOutstanding>121940068</noOfUnitsOutstanding>
      <approxSaleDate>03/12/2024</approxSaleDate>
      <securitiesExchangeName>NYSE</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>05/16/2019</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Lapse - See Remarks</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>BUILDERS FIRSTSOURCE, INC.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>17500</amountOfSecuritiesAcquired>
      <paymentDate>05/16/2019</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <remarks>Shares on this filing were acquired and paid for between 05/16/2019 - 03/01/2023 and may be sold over various dates.</remarks>
    <noticeSignature>
      <noticeDate>03/12/2024</noticeDate>
      <signature>Cory Jacobs Boydston</signature>
    </noticeSignature>
  </formData>
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144
0001306297
XXXXXXXX
LIVE
0001316835
Builders FirstSource, Inc.
001-40620
6031 CONNECTION DR., STE. 400
IRVING
TX
75039
(214) 880-3500
Boydston Cory Jacobs
Director
Common
Charles Schwab & Co., Inc.
3000 Schwab Way
Westlake
TX
76262
17500
3500001.00
121940068
03/12/2024
NYSE
Common
05/16/2019
Restricted Stock Lapse - See Remarks
BUILDERS FIRSTSOURCE, INC.
N
17500
05/16/2019
Equity Compensation
Y
Shares on this filing were acquired and paid for between 05/16/2019 - 03/01/2023 and may be sold over various dates.
03/12/2024
Cory Jacobs Boydston