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    <periodOfReport>2021-08-24</periodOfReport>

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    <issuer>
        <issuerCik>0001837014</issuerCik>
        <issuerName>SmartRent, Inc.</issuerName>
        <issuerTradingSymbol>SMRT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001578516</rptOwnerCik>
            <rptOwnerName>Best Robert T.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>18835 N. THOMPSON PEAK PARKWAY</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>SCOTTSDALE</rptOwnerCity>
            <rptOwnerState>AZ</rptOwnerState>
            <rptOwnerZipCode>85255</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>4596222</value>
                </transactionShares>
                <transactionPricePerShare>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Best Family Trust, est. October 2, 2001</value>
                    <footnoteId id="F2"/>
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                <directOrIndirectOwnership>
                    <value>D</value>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>12397</value>
                </transactionShares>
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                    <value>0.00</value>
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                    <value>A</value>
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    <footnotes>
        <footnote id="F1">Pursuant to the business combination of Fifth Wall Acquisition Corp. I and SmartRent.com, Inc. (&quot;Legacy SmartRent&quot;), each share of Legacy SmartRent outstanding common and preferred stock and common stock underlying outstanding warrants was automatically converted into shares of the issuer's Class A Common Stock based on a 1-to-4.8846 exchange ratio (the &quot;Exchange Ratio&quot;). In addition, each outstanding Legacy SmartRent equity award was automatically converted into a corresponding equity award of the issuer based on the Exchange Ratio and with the same terms and vesting conditions as the Legacy SmartRent equity awards.</footnote>
        <footnote id="F2">Mr. Best, as trustee, has voting and dispositive power over the trust assets and Mr. Best, Mrs. Sheri Best (wife), Colin Best (son), Ryan Best (son), Connor Best (son), and Cameron Doering (daughter) are the beneficiaries of the trust.</footnote>
        <footnote id="F3">Each restricted stock unit represents a contingent right to receive one share of the issuer's Class A Common Stock.</footnote>
        <footnote id="F4">One-third of the restricted stock units vest on August 24, 2022, and one-third will vest on the 12-month anniversary thereof each year until vested in full.</footnote>
        <footnote id="F5">The restricted stock units will vest in full on the earlier of (a) August 24, 2022 or (b) the date immediately prior to the next annual meeting of the issuer's stockholders occurring after the date of grant.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Robert T. Best</signatureName>
        <signatureDate>2021-08-26</signatureDate>
    </ownerSignature>
</ownershipDocument>
