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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-01-02</periodOfReport>

    <issuer>
        <issuerCik>0000105634</issuerCik>
        <issuerName>EMCOR Group, Inc.</issuerName>
        <issuerTradingSymbol>EME</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001306045</rptOwnerCik>
            <rptOwnerName>Guzzi Anthony</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>301 MERRITT SEVEN</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NORWALK</rptOwnerCity>
            <rptOwnerState>CT</rptOwnerState>
            <rptOwnerZipCode>06851</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chairman, President and CEO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-01-02</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>26242</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>372127</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5790</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By The Guzzi Family Irrevocable Trust</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The shares reported herein as acquired represent shares of common stock issuable in the future in respect of restricted stock units (&quot;RSUs&quot;) granted pursuant to the EMCOR Group, Inc. Long Term Incentive Plan.</footnote>
        <footnote id="F2">Includes shares issuable in respect of RSUs.</footnote>
        <footnote id="F3">These securities were transferred by the reporting person as a gift to the Guzzi Family Irrevocable Trust (the &quot;Trust&quot;) for the benefit of the reporting person's children.  The reporting person's spouse is trustee of the Trust.  Such transfer was reported on a previously filed Form 4.  The reporting person disclaims beneficial ownership of such securities.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Anthony Guzzi</signatureName>
        <signatureDate>2020-01-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0306
4
2020-01-02
0000105634
EMCOR Group, Inc.
EME
0001306045
Guzzi Anthony
301 MERRITT SEVEN
NORWALK
CT
06851
1
1
0
0
Chairman, President and CEO
Common Stock
2020-01-02
4
A
0
26242
0
A
372127
D
Common Stock
5790
I
By The Guzzi Family Irrevocable Trust
The shares reported herein as acquired represent shares of common stock issuable in the future in respect of restricted stock units ("RSUs") granted pursuant to the EMCOR Group, Inc. Long Term Incentive Plan.
Includes shares issuable in respect of RSUs.
These securities were transferred by the reporting person as a gift to the Guzzi Family Irrevocable Trust (the "Trust") for the benefit of the reporting person's children.  The reporting person's spouse is trustee of the Trust.  Such transfer was reported on a previously filed Form 4.  The reporting person disclaims beneficial ownership of such securities.
Anthony Guzzi
2020-01-03