William Lyon Homes (WLH) 10-K 2015 FY Annual report

EXHIBIT 32.3

CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of William Lyon Homes (the “Company”) on Form 10-K for the period ending December 31, 2015 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Colin T. Severn, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/S/ COLIN T. SEVERN

Colin T. Severn

Senior Vice President, Chief Financial Officer

March 11, 2016

A signed original of this written statement required by Section 906 has been provided to William Lyon Homes and will be retained by William Lyon Homes and furnished to the Securities and Exchange Commission or its staff upon request.