Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Tolly Morris E
 2. Date of Event Requiring Statement (Month/Day/Year)
01/25/2007		 3. Issuer Name and Ticker or Trading Symbol
Builders FirstSource, Inc. [BLDR]
(Last)
(First)
(Middle)
BUILDERS FIRSTSOURCE, INC., 2001 BRYAN ST., SUITE 1600		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Sr Vice President-Operations
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

DALLAS, TX 75201		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock, par value $0.01 per share (1) 42,758
D
 
Common Stock, par value $0.01 per share (2) 21,400
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (right to buy)   (3) 01/01/2013 Common Stock, par value $0.01 per share 10,800 $ 3.15 D  
Employee Stock Option (right to buy)   (4) 02/27/2014 Common Stock, par value $0.01 per share 62,500 $ 3.15 D  
Employee Stock Option (right to buy)   (5) 02/14/2016 Common Stock, par value $0.01 per share 35,700 $ 23.87 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Tolly Morris E
BUILDERS FIRSTSOURCE, INC.
2001 BRYAN ST., SUITE 1600
DALLAS, TX 75201		       Sr Vice President-Operations  

Signatures

/s/ Morris E. Tolly 02/03/2007
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Restricted stock award issued under the Company's 2005 Equity Incentive Plan. 9,424 shares are currently vested. 16,667 shares will vest on each of October 25, 2007 and 2008.
(2) Restricted stock award issued under the Company's 2005 Equity Incentive Plan. The grant vests in 33.3% increments on each of February 14, 2007-2009.
(3) Award issued under the Company's 1998 Stock Incentive Plan. 5,400 options are currently exercisable. 5,400 options will become exercisable on January 1, 2008 if certain financial performance targets are met. Regardless of whether those financial targets are met, the options will be fully exercisable on January 1, 2012.
(4) Award issued under the Company's 1998 Stock Incentive Plan. 12,500 options are currently exercisable. 50,000 options became exercisable on December 31, 2006 if certain financial performance targets were met. Regardless of whether those financial targets were met, the options will be fully exercisable on December 31, 2011.
(5) Award issued under the Company's 2005 Equity Incentive Plan. The options vest in 33.3% increments on each of February 14, 2007-2009.

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