Designated Filer:

Warburg Pincus Private Equity IX, L.P.

Issuer & Ticker Symbol:

Builders FirstSource, Inc. (BLDR)

Date of Event Requiring Statement: January 21, 2010


Exhibit 99.3

JOINT FILERS’ SIGNATURES

 

WARBURG PINCUS IX, LLC

 

By: Warburg Pincus Partners, LLC, its Sole Member,

 

By: Warburg Pincus & Co., its Managing Member

 

By: /s/ Scott A. Arenare

Date:January 22, 2010

 

Name: Scott A. Arenare

 

Title: Partner

WARBURG PINCUS PARTNERS, LLC

 

By: Warburg Pincus & Co., its Managing Member

 

By: /s/ Scott A. Arenare

Date:January 22, 2010

 

Name: Scott A. Arenare

 

Title: Partner

WARBURG PINCUS LLC

 

By: /s/ Scott A. Arenare

Date:January 22, 2010

 

Name: Scott A. Arenare

 

Title: Managing Director

 

WARBURG PINCUS & CO.

 

By: /s/ Scott A. Arenare

Date:January 22, 2010

 

Name: Scott A. Arenare

 

Title: Partner

By: /s/ Scott A. Arenare

Date:January 22, 2010

 

Name: Charles R. Kaye

 

By: Scott A. Arenare, Attorney-in-Fact

 

By: /s/ Scott A. Arenare

Date:January 22, 2010

 

Name: Joseph P. Landy

 

By: Scott A. Arenare, Attorney-in-Fact