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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-12-09</periodOfReport>

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

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            <rptOwnerName>BROWN DAVID A B</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
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            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WINCHESTER</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01890-2923</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
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            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

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                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            </transactionAmounts>
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                <transactionAcquiredDisposedCode>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
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                <transactionCode>S</transactionCode>
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                <transactionShares>
                    <value>62</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>86.90</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
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                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2019-12-09</value>
            </transactionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
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            <transactionAmounts>
                <transactionShares>
                    <value>100</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>86.91</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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        <nonDerivativeTransaction>
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                <value>Common Stock</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <transactionCode>S</transactionCode>
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                    <value>38</value>
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                <transactionPricePerShare>
                    <value>86.92</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <value>Common Stock</value>
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            <transactionDate>
                <value>2019-12-09</value>
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                <transactionCode>S</transactionCode>
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                <transactionShares>
                    <value>100</value>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                    <value>200</value>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
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                    <value></value>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
                <value>2019-12-09</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>231</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>87.00</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
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                    <value></value>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>62</value>
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                <transactionPricePerShare>
                    <value>87.02</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <postTransactionAmounts>
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                    <value>22247.83</value>
                    <footnoteId id="F1"/>
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                <directOrIndirectOwnership>
                    <value>D</value>
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                    <value></value>
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        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Includes shares issuable in respect of restricted stock units.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Maxine M. Mauricio, Attorney-in-Fact</signatureName>
        <signatureDate>2019-12-10</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0306
4
2019-12-09
0000105634
EMCOR Group, Inc.
EME
0001112508
BROWN DAVID A B
379 MAIN STREET
WINCHESTER
MA
01890-2923
1
0
0
0
Common Stock
2019-12-09
4
S
0
107
86.80
D
23640.83
D
Common Stock
2019-12-09
4
S
0
100
86.825
D
23540.83
D
Common Stock
2019-12-09
4
S
0
100
86.84
D
23440.83
D
Common Stock
2019-12-09
4
S
0
100
86.85
D
23340.83
D
Common Stock
2019-12-09
4
S
0
100
86.88
D
23240.83
D
Common Stock
2019-12-09
4
S
0
100
86.885
D
23140.83
D
Common Stock
2019-12-09
4
S
0
62
86.90
D
23078.83
D
Common Stock
2019-12-09
4
S
0
100
86.91
D
22978.83
D
Common Stock
2019-12-09
4
S
0
100
86.915
D
22878.83
D
Common Stock
2019-12-09
4
S
0
38
86.92
D
21840.83
D
Common Stock
2019-12-09
4
S
0
100
86.93
D
22740.83
D
Common Stock
2019-12-09
4
S
0
200
86.94
D
22540.83
D
Common Stock
2019-12-09
4
S
0
231
87.00
D
22309.83
D
Common Stock
2019-12-09
4
S
0
62
87.02
D
22247.83
D
Includes shares issuable in respect of restricted stock units.
Maxine M. Mauricio, Attorney-in-Fact
2019-12-10