Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the Registration Statement (Form S-8, No. 333-157535) pertaining to the Leggett & Platt, Incorporated Stock Bonus Plan of our report dated June 18, 2014, on our audit of the financial statements and financial statement schedules of the Leggett & Platt, Incorporated Stock Bonus Plan as of and for the years ended December 31, 2013 and 2012, which report is included in this Annual Report (Form 11-K).

BKD, LLP

/s/ BKD, LLP

Joplin, Missouri

June 18, 2014