<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2013-05-21</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001095996</issuerCik>
        <issuerName>WILLIAM LYON HOMES</issuerName>
        <issuerTradingSymbol>WLH</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001316580</rptOwnerCik>
            <rptOwnerName>Luxor Capital Group, LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1114 AVENUE OF THE AMERICAS</rptOwnerStreet1>
            <rptOwnerStreet2>29TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10036</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001356913</rptOwnerCik>
            <rptOwnerName>LUXOR CAPITAL PARTNERS OFFSHORE LTD</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O M&amp;C CORPORATE SVCS LTD</rptOwnerStreet1>
            <rptOwnerStreet2>PO BOX 309 GT UGLAND HOUSE</rptOwnerStreet2>
            <rptOwnerCity>GEORGE TOWN</rptOwnerCity>
            <rptOwnerState>E9</rptOwnerState>
            <rptOwnerZipCode>00000</rptOwnerZipCode>
            <rptOwnerStateDescription>CAYMAN ISLANDS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001393021</rptOwnerCik>
            <rptOwnerName>Luxor Capital Partners, LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1114 AVENUE OF THE AMERICAS</rptOwnerStreet1>
            <rptOwnerStreet2>29TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10036</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001479129</rptOwnerCik>
            <rptOwnerName>Luxor Wavefront, LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1114 AVENUE OF THE AMERICAS</rptOwnerStreet1>
            <rptOwnerStreet2>29TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10036</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001434200</rptOwnerCik>
            <rptOwnerName>LUXOR SPECTRUM OFFSHORE LTD</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O MAPLES CORPORATE SERVICES LTD</rptOwnerStreet1>
            <rptOwnerStreet2>P.O. BOX 309 GT</rptOwnerStreet2>
            <rptOwnerCity>GEORGE TOWN</rptOwnerCity>
            <rptOwnerState>E9</rptOwnerState>
            <rptOwnerZipCode>KY1-1104</rptOwnerZipCode>
            <rptOwnerStateDescription>CAYMAN ISLANDS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2013-05-21</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>709322</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
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            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
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            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
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                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
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                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>418964</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
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                    <footnoteId id="F8"/>
                    <footnoteId id="F9"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
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            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
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                <transactionCode>C</transactionCode>
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            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1482233</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
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                    <footnoteId id="F9"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2013-05-21</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
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                <transactionPricePerShare>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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            <ownershipNature>
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        </nonDerivativeTransaction>
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                <value>Class A Common Stock</value>
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            <deemedExecutionDate></deemedExecutionDate>
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            <postTransactionAmounts>
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            <transactionDate>
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                    <footnoteId id="F8"/>
                    <footnoteId id="F9"/>
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                <value>2013-05-21</value>
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            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
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                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                    <footnoteId id="F1"/>
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            <underlyingSecurity>
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                    <value>90506</value>
                    <footnoteId id="F1"/>
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            </underlyingSecurity>
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                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <underlyingSecurity>
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                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                    <footnoteId id="F1"/>
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            </underlyingSecurity>
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        <derivativeTransaction>
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            <transactionDate>
                <value>2013-05-21</value>
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                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                <transactionShares>
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                <transactionPricePerShare>
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                <footnoteId id="F2"/>
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            <underlyingSecurity>
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                    <footnoteId id="F1"/>
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            </underlyingSecurity>
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                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>4376147</value>
                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            <expirationDate>
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        <derivativeTransaction>
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            </underlyingSecurity>
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                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
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                <transactionShares>
                    <value>4908581</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F2"/>
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                </sharesOwnedFollowingTransaction>
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            <securityTitle>
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                <footnoteId id="F2"/>
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                <transactionCode>C</transactionCode>
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                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F2"/>
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                    <value>D</value>
                </transactionAcquiredDisposedCode>
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                <footnoteId id="F2"/>
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            <expirationDate>
                <footnoteId id="F2"/>
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                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>328706</value>
                    <footnoteId id="F1"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See</value>
                    <footnoteId id="F7"/>
                    <footnoteId id="F8"/>
                    <footnoteId id="F9"/>
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            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Reflects the number of shares of Class A Common Stock after taking into account the issuer's 1:8.25 reverse stock split.</footnote>
        <footnote id="F2">Immediately prior to the consummation of the initial public offering of the issuer's Class A Common Stock, the Class C Common Stock and the Convertible Preferred Stock automatically converted into Class A Common Stock.  The issuer's initial public offering of its Class A Common Stock closed on May 21, 2013.</footnote>
        <footnote id="F3">Reflects the securities of the issuer owned directly by Luxor Capital Partners, LP (the &quot;Onshore Fund&quot;).</footnote>
        <footnote id="F4">Reflects the securities of the issuer owned directly by Luxor Wavefront, LP (the &quot;Wavefront Fund&quot;).</footnote>
        <footnote id="F5">Reflects the securities of the issuer owned directly by Luxor Capital II Company (the &quot;Capital II Company&quot;).  The Capital II Company is a subsidiary of Luxor Capital Partners Offshore Master Fund, LP (the &quot;Offshore Master Fund&quot;).  The Offshore Master Fund is a subsidiary of Luxor Capital Partners Offshore, Ltd. (the &quot;Offshore Feeder Fund&quot;).</footnote>
        <footnote id="F6">Reflects the securities of the issuer owned directly by Luxor Spectrum Offshore Master Fund, LP (the &quot;Spectrum Offshore Master Fund&quot;).  The Spectrum Offshore Master Fund is a subsidiary of Luxor Spectrum Offshore, Ltd. (the &quot;Spectrum Offshore Feeder Fund&quot;).</footnote>
        <footnote id="F7">Reflects the securities of the issuer held in an account managed separately (the &quot;Separately Managed Account&quot;) by Luxor Capital Group, LP (&quot;Luxor Capital Group&quot;).</footnote>
        <footnote id="F8">Luxor Capital Group acts as the investment manager of the Onshore Fund, the Wavefront Fund, the Offshore Master Fund, the Offshore Feeder Fund, the Spectrum Offshore Master Fund and the Spectrum Offshore Feeder Fund (collectively, the &quot;Luxor Funds&quot;) and the Separately Managed Account.  Luxor Management, LLC (&quot;Luxor Management&quot;) is the general partner of Luxor Capital Group.  Mr. Leone is the managing member of Luxor Management.  LCG Holdings, LLC (&quot;LCG Holdings&quot;) is the general partner of the Onshore Fund, the Wavefront Fund, the Offshore Master Fund and the Offshore Spectrum Master Fund.  Mr. Leone is the managing member of LCG Holdings.</footnote>
        <footnote id="F9">Luxor Capital Group, Luxor Management and Mr. Leone may each be deemed to indirectly beneficially own the shares of common stock held by the Luxor Funds, the Capital II Company and the Separately Managed Account.  LCG Holdings may be deemed to indirectly beneficially own the shares of common stock held by the Onshore Fund, the Wavefront Fund, the Capital II Company, the Offshore Master Fund and the Spectrum Offshore Master Fund.  For purposes of this Form 4, Luxor Capital Group, Luxor Management, LCG Holdings and Mr. Leone each disclaims beneficial ownership of the shares of common stock owned by the Luxor Funds, the Capital II Company and the Separately Managed Account, except to the extent of their or his pecuniary interest therein.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Norris Nissim, as General Counsel of Luxor Management, LLC, General Partner of Luxor Capital Group, LP</signatureName>
        <signatureDate>2013-05-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
