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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="iesc_TotalLeaseLiabilityUndiscountedExcessAmount" abstract="false" name="TotalLeaseLiabilityUndiscountedExcessAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iesc_TotalLeaseLiabilityPaymentsYearFive" abstract="false" name="TotalLeaseLiabilityPaymentsYearFive" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iesc_PerformanceObligationNext12Months" abstract="false" name="PerformanceObligationNext12Months" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iesc_TotalLeaseLiabilityPaymentsYearThree" abstract="false" name="TotalLeaseLiabilityPaymentsYearThree" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iesc_CustomPowerSolutionsMember" abstract="true" name="CustomPowerSolutionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="iesc_PhantomShareUnitsEmployeePSUsMember" abstract="true" name="PhantomShareUnitsEmployeePSUsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="iesc_MultiFamilyandOtherMember" abstract="true" name="MultiFamilyandOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="iesc_TotalLeaseLiabilityPaymentsDue" abstract="false" name="TotalLeaseLiabilityPaymentsDue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iesc_EquityIncentivePlanMember" abstract="true" name="EquityIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="iesc_CommunicationsMember" abstract="true" name="CommunicationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="iesc_CommercialandIndustrialMember" abstract="true" name="CommercialandIndustrialMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="iesc_GreinerIndustriesMember" abstract="true" name="GreinerIndustriesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iesc_Estimatedcostofcompletionofbondedproject" abstract="false" name="Estimatedcostofcompletionofbondedproject" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iesc_InsuranceRelatedMember" abstract="true" name="InsuranceRelatedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="iesc_InfrastructureSolutionsMember" abstract="true" name="InfrastructureSolutionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="iesc_TotalLeaseLiability" abstract="false" name="TotalLeaseLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iesc_FinanceLeaseCost" abstract="false" name="FinanceLeaseCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iesc_ResidentialMember" abstract="true" name="ResidentialMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="iesc_TotalLeaseLiabilityPaymentsYearFour" abstract="false" name="TotalLeaseLiabilityPaymentsYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iesc_IndustrialServicesMember" abstract="true" name="IndustrialServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="iesc_ControllingShareholderOwnershipPercentage" abstract="false" name="ControllingShareholderOwnershipPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="iesc_TotalLeaseLiabilityPaymentsYearTwo" abstract="false" name="TotalLeaseLiabilityPaymentsYearTwo" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iesc_OperatingLeasesnotyetCommenced" abstract="false" name="OperatingLeasesnotyetCommenced" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iesc_SingleFamilyContractsMember" abstract="true" name="SingleFamilyContractsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="iesc_ControllingShareholderTextBlock" abstract="false" name="ControllingShareholderTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="iesc_LesseeTotalLeaseLiabilityPaymentsRemainderOfFiscalYear" abstract="false" name="LesseeTotalLeaseLiabilityPaymentsRemainderOfFiscalYear" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iesc_TotalLeaseLiabilityPaymentsDueAfterYearFive" abstract="false" name="TotalLeaseLiabilityPaymentsDueAfterYearFive" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
