-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 FSgO79yWONGfA4LUYRcAFd9TW6T963JdLVF9kU8Pm52ddktesXn6AAAainTWyJdx
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<SEC-DOCUMENT>0001140361-10-033640.txt : 20100816
<SEC-HEADER>0001140361-10-033640.hdr.sgml : 20100816
<ACCEPTANCE-DATETIME>20100816132944
ACCESSION NUMBER:		0001140361-10-033640
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100812
FILED AS OF DATE:		20100816
DATE AS OF CHANGE:		20100816

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SULLIVAN THOMAS D
		CENTRAL INDEX KEY:			0001417490

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33767
		FILM NUMBER:		101018526

	MAIL ADDRESS:	
		STREET 1:		3000 JOHN DEERE ROAD
		CITY:			TOANO
		STATE:			VA
		ZIP:			23168

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Lumber Liquidators Holdings, Inc.
		CENTRAL INDEX KEY:			0001396033
		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-LUMBER & OTHER BUILDING MATERIALS DEALERS [5211]
		IRS NUMBER:				271310817
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3000 JOHN DEERE ROAD
		CITY:			TOANO
		STATE:			VA
		ZIP:			23168
		BUSINESS PHONE:		757-259-4280

	MAIL ADDRESS:	
		STREET 1:		3000 JOHN DEERE ROAD
		CITY:			TOANO
		STATE:			VA
		ZIP:			23168

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Lumber Liquidators, Inc.
		DATE OF NAME CHANGE:	20070410
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4/A
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2010-08-12</periodOfReport>

    <dateOfOriginalSubmission>2010-08-16</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001396033</issuerCik>
        <issuerName>Lumber Liquidators Holdings, Inc.</issuerName>
        <issuerTradingSymbol>LL</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001417490</rptOwnerCik>
            <rptOwnerName>SULLIVAN THOMAS D</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>3000 JOHN DEERE ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>TOANO</rptOwnerCity>
            <rptOwnerState>VA</rptOwnerState>
            <rptOwnerZipCode>23168</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chairman of the Board; Founder</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-08-12</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>100000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>21.2107</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3908256</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-08-13</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>86506</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>21.1502</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                    <footnoteId id="F4"/>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3821750</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Weighted average sale price for prices ranging from $21.18 to $21.30.  13,527 shares were sold at $21.18 per share; 3,700 shares were sold at $21.19 per share; 28,680 shares were sold at $21.20 per share; 31,893 shares were sold at $21.21 per share; 3,027 shares were sold at $21.22 per share; 17,496 shares were sold at $21.25 per share; 1,400 shares were sold at $21.27 per share; and 277 shares sold at $21.30 per share.</footnote>
        <footnote id="F2">Weighted average sale price for prices ranging from $21.00 to $21.42.  159 shares were sold at $21.13 per share; 200 shares were sold at each of the following prices: $21.07, $21.32 and $21.42; 395 shares were sold at $21.12 per share; 500 shares were sold at $21.08 per share; 600 shares were sold at each of the following prices: $21.11 and $21.23; 800 shares were sold at each of the following prices: $21.05 and $21.09; 900 shares were sold at $21.04 per share; 1,822 shares were sold at $21.06 per share; 2,200 shares were sold at $21.19 per share; 2,500 shares were sold at $21.38 per share; 2,996 were sold at $21.10 per share; 3,174 shares were sold at $21.17 per share; 3,200 shares were sold at $21.41 per share; 3,252 shares were sold at $21.20 per share; 3,338 shares were sold at $21.01 per share; 4,100 shares were sold at $21.36 per share; 4,300 shares were sold at $21.33 per share; 4,732 shares were sold at $21.18 per share (continued in Footnote 3).</footnote>
        <footnote id="F3">(Continued from Footnote2) 4,796 shares were sold at $21.37 per share; 4,997 shares were sold at $21.40 per share; 8,800 shares were sold at $21.03 per share; 12,862 shares were sold at $21.00 per share; and 14,110 shares were sold at $21.02 per share.</footnote>
        <footnote id="F4">This amendment is filed to correct an error in the action from acquired to disposed of.  All other information was correctly reported on the transactions.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ E. Livingston B. Haskell, Power-of-Attorney</signatureName>
        <signatureDate>2010-08-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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