<?xml version="1.0" encoding="UTF-8" standalone="no"?><!--IFIndAs V2.1 (26-06-2026)--><xbrli:xbrl xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:in-capmkt="http://www.sebi.gov.in/xbrl/2026-01-31/in-capmkt" xmlns:in-capmkt-ent="http://www.sebi.gov.in/xbrl/IntegratedFinance_IndAS/2026-01-31/in-capmkt/in-capmkt-ent" xmlns:in-capmkt-roles="http://www.sebi.gov.in/xbrl/IntegratedFinance_IndAS/2026-01-31/in-capmkt-roles" xmlns:in-capmkt-types="http://www.sebi.gov.in/xbrl/2026-01-31/in-capmkt-types" xmlns:iso4217="http://www.xbrl.org/2003/iso4217" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:negated="http://www.xbrl.org/2009/role/negated" xmlns:net="http://www.xbrl.org/2009/role/net" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xl="http://www.xbrl.org/2003/XLink" xmlns:xlink="http://www.w3.org/1999/xlink"><link:schemaRef xlink:href="in-capmkt-ent-2026-01-31.xsd" xlink:type="simple"/><xbrli:context id="OneD"><xbrli:entity><xbrli:identifier scheme="http://www.sebi.gov.in/in-capmkt/ScripCode">540061</xbrli:identifier></xbrli:entity><xbrli:period><xbrli:startDate>2026-04-01</xbrli:startDate><xbrli:endDate>2026-06-30</xbrli:endDate></xbrli:period></xbrli:context><xbrli:context id="OneExpenses1D"><xbrli:entity><xbrli:identifier scheme="http://www.sebi.gov.in/in-capmkt/ScripCode">540061</xbrli:identifier></xbrli:entity><xbrli:period><xbrli:startDate>2026-04-01</xbrli:startDate><xbrli:endDate>2026-06-30</xbrli:endDate></xbrli:period><xbrli:scenario><xbrldi:explicitMember dimension="in-capmkt:DetailsOfOtherExpensesAxis">in-capmkt:OtherExpenses1Member</xbrldi:explicitMember></xbrli:scenario></xbrli:context><xbrli:unit id="INR"><xbrli:measure>iso4217:INR</xbrli:measure></xbrli:unit><xbrli:unit id="INRPerShare"><xbrli:divide><xbrli:unitNumerator><xbrli:measure>iso4217:INR</xbrli:measure></xbrli:unitNumerator><xbrli:unitDenominator><xbrli:measure>xbrli:shares</xbrli:measure></xbrli:unitDenominator></xbrli:divide></xbrli:unit><in-capmkt:ScripCode contextRef="OneD">540061</in-capmkt:ScripCode><in-capmkt:Symbol contextRef="OneD">BIGBLOC</in-capmkt:Symbol><in-capmkt:MSEISymbol contextRef="OneD">NOTLISTED</in-capmkt:MSEISymbol><in-capmkt:ISIN contextRef="OneD">INE412U01025</in-capmkt:ISIN><in-capmkt:NameOfTheCompany contextRef="OneD">Bigbloc Construction Limited</in-capmkt:NameOfTheCompany><in-capmkt:TypeOfCompany contextRef="OneD">Main Board</in-capmkt:TypeOfCompany><in-capmkt:ClassOfSecurity contextRef="OneD">Equity</in-capmkt:ClassOfSecurity><in-capmkt:DateOfStartOfFinancialYear contextRef="OneD">2026-04-01</in-capmkt:DateOfStartOfFinancialYear><in-capmkt:DateOfEndOfFinancialYear contextRef="OneD">2027-03-31</in-capmkt:DateOfEndOfFinancialYear><in-capmkt:DateOfBoardMeetingWhenFinancialResultsWereApproved contextRef="OneD">2026-08-07</in-capmkt:DateOfBoardMeetingWhenFinancialResultsWereApproved><in-capmkt:DateOnWhichPriorIntimationOfTheMeetingForConsideringFinancialResultsWasInformedToTheExchange contextRef="OneD">2026-07-31</in-capmkt:DateOnWhichPriorIntimationOfTheMeetingForConsideringFinancialResultsWasInformedToTheExchange><in-capmkt:DescriptionOfPresentationCurrency contextRef="OneD">INR</in-capmkt:DescriptionOfPresentationCurrency><in-capmkt:LevelOfRounding contextRef="OneD">Lakhs</in-capmkt:LevelOfRounding><in-capmkt:TypeOfReportingPeriod contextRef="OneD">Quarterly</in-capmkt:TypeOfReportingPeriod><in-capmkt:ReportingQuarter contextRef="OneD">First quarter</in-capmkt:ReportingQuarter><in-capmkt:IsCompanyReportingMultisegmentOrSingleSegment contextRef="OneD">Single segment</in-capmkt:IsCompanyReportingMultisegmentOrSingleSegment><in-capmkt:DescriptionOfSingleSegment contextRef="OneD">AAC BLOCKS BUSINESS</in-capmkt:DescriptionOfSingleSegment><in-capmkt:DateOfStartOfBoardMeeting contextRef="OneD">2026-08-07</in-capmkt:DateOfStartOfBoardMeeting><in-capmkt:StartTimeOfBoardMeeting contextRef="OneD">15:15:00</in-capmkt:StartTimeOfBoardMeeting><in-capmkt:DateOfEndOfBoardMeeting contextRef="OneD">2026-08-07</in-capmkt:DateOfEndOfBoardMeeting><in-capmkt:EndTimeOfBoardMeeting contextRef="OneD">15:40:00</in-capmkt:EndTimeOfBoardMeeting><in-capmkt:DeclarationOfUnmodifiedOpinionOrStatementOnImpactOfAuditQualification contextRef="OneD">Not applicable</in-capmkt:DeclarationOfUnmodifiedOpinionOrStatementOnImpactOfAuditQualification><in-capmkt:WhetherStatementOnDeviationOrVariationForProceedsOfPublicIssueOrRightIssueOrPreferentialIssueOrQIPEtcIsApplicableToTheCompanyForTheCurrentQuarter contextRef="OneD">false</in-capmkt:WhetherStatementOnDeviationOrVariationForProceedsOfPublicIssueOrRightIssueOrPreferentialIssueOrQIPEtcIsApplicableToTheCompanyForTheCurrentQuarter><in-capmkt:WhetherTheDisclosureForTheDefaultOnLoansAndDebtSecuritiesIsApplicableToTheEntity contextRef="OneD">false</in-capmkt:WhetherTheDisclosureForTheDefaultOnLoansAndDebtSecuritiesIsApplicableToTheEntity><in-capmkt:NoteForNonApplicabilityOfTheDisclosureForTheDefaultOnLoansAndDebtSecuritiesToTheEntity contextRef="OneD">The Company has not defaulted in loans</in-capmkt:NoteForNonApplicabilityOfTheDisclosureForTheDefaultOnLoansAndDebtSecuritiesToTheEntity><in-capmkt:DateOfStartOfReportingPeriod contextRef="OneD">2026-04-01</in-capmkt:DateOfStartOfReportingPeriod><in-capmkt:DateOfEndOfReportingPeriod contextRef="OneD">2026-06-30</in-capmkt:DateOfEndOfReportingPeriod><in-capmkt:WhetherResultsAreAuditedOrUnaudited contextRef="OneD">Unaudited</in-capmkt:WhetherResultsAreAuditedOrUnaudited><in-capmkt:NatureOfReportStandaloneConsolidated contextRef="OneD">Standalone</in-capmkt:NatureOfReportStandaloneConsolidated><in-capmkt:RevenueFromOperations contextRef="OneD" decimals="-3" unitRef="INR">215665000</in-capmkt:RevenueFromOperations><in-capmkt:OtherIncome contextRef="OneD" decimals="-3" unitRef="INR">10793000</in-capmkt:OtherIncome><in-capmkt:Income contextRef="OneD" decimals="-3" unitRef="INR">226458000</in-capmkt:Income><in-capmkt:CostOfMaterialsConsumed contextRef="OneD" decimals="-3" unitRef="INR">61056000</in-capmkt:CostOfMaterialsConsumed><in-capmkt:PurchasesOfStockInTrade contextRef="OneD" decimals="-4" unitRef="INR">60140000</in-capmkt:PurchasesOfStockInTrade><in-capmkt:ChangesInInventoriesOfFinishedGoodsWorkInProgressAndStockInTrade contextRef="OneD" decimals="-3" unitRef="INR">-4754000</in-capmkt:ChangesInInventoriesOfFinishedGoodsWorkInProgressAndStockInTrade><in-capmkt:EmployeeBenefitExpense contextRef="OneD" decimals="-3" unitRef="INR">23915000</in-capmkt:EmployeeBenefitExpense><in-capmkt:FinanceCosts contextRef="OneD" decimals="-3" unitRef="INR">16611000</in-capmkt:FinanceCosts><in-capmkt:DepreciationDepletionAndAmortisationExpense contextRef="OneD" decimals="-3" unitRef="INR">12645000</in-capmkt:DepreciationDepletionAndAmortisationExpense><in-capmkt:OtherExpenses contextRef="OneD" decimals="-3" unitRef="INR">78792000</in-capmkt:OtherExpenses><in-capmkt:Expenses contextRef="OneD" decimals="-3" unitRef="INR">248405000</in-capmkt:Expenses><in-capmkt:ProfitBeforeExceptionalItemsAndTax contextRef="OneD" decimals="-3" unitRef="INR">-21947000</in-capmkt:ProfitBeforeExceptionalItemsAndTax><in-capmkt:ExceptionalItemsBeforeTax contextRef="OneD" decimals="-5" unitRef="INR">0</in-capmkt:ExceptionalItemsBeforeTax><in-capmkt:ProfitBeforeTax contextRef="OneD" decimals="-3" unitRef="INR">-21947000</in-capmkt:ProfitBeforeTax><in-capmkt:CurrentTax contextRef="OneD" decimals="-5" unitRef="INR">0</in-capmkt:CurrentTax><in-capmkt:DeferredTax contextRef="OneD" decimals="-3" unitRef="INR">-5515000</in-capmkt:DeferredTax><in-capmkt:TaxExpense contextRef="OneD" decimals="-3" unitRef="INR">-5515000</in-capmkt:TaxExpense><in-capmkt:NetMovementInRegulatoryDeferralAccountBalancesRelatedToProfitOrLossAndTheRelatedDeferredTaxMovement contextRef="OneD" decimals="-5" unitRef="INR">0</in-capmkt:NetMovementInRegulatoryDeferralAccountBalancesRelatedToProfitOrLossAndTheRelatedDeferredTaxMovement><in-capmkt:ProfitLossForPeriodFromContinuingOperations contextRef="OneD" decimals="-3" unitRef="INR">-16432000</in-capmkt:ProfitLossForPeriodFromContinuingOperations><in-capmkt:ProfitLossFromDiscontinuedOperationsBeforeTax contextRef="OneD" decimals="-5" unitRef="INR">0</in-capmkt:ProfitLossFromDiscontinuedOperationsBeforeTax><in-capmkt:TaxExpenseOfDiscontinuedOperations contextRef="OneD" decimals="-5" unitRef="INR">0</in-capmkt:TaxExpenseOfDiscontinuedOperations><in-capmkt:ProfitLossFromDiscontinuedOperationsAfterTax contextRef="OneD" decimals="-5" unitRef="INR">0</in-capmkt:ProfitLossFromDiscontinuedOperationsAfterTax><in-capmkt:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod contextRef="OneD" decimals="-5" unitRef="INR">0</in-capmkt:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod><in-capmkt:ProfitLossForPeriod contextRef="OneD" decimals="-3" unitRef="INR">-16432000</in-capmkt:ProfitLossForPeriod><in-capmkt:OtherComprehensiveIncomeNetOfTaxes contextRef="OneD" decimals="-5" unitRef="INR">0</in-capmkt:OtherComprehensiveIncomeNetOfTaxes><in-capmkt:ComprehensiveIncomeForThePeriod contextRef="OneD" decimals="-3" unitRef="INR">-16432000</in-capmkt:ComprehensiveIncomeForThePeriod><in-capmkt:PaidUpValueOfEquityShareCapital contextRef="OneD" decimals="-3" unitRef="INR">283152000</in-capmkt:PaidUpValueOfEquityShareCapital><in-capmkt:FaceValueOfEquityShareCapital contextRef="OneD" decimals="INF" unitRef="INRPerShare">2</in-capmkt:FaceValueOfEquityShareCapital><in-capmkt:BasicEarningsLossPerShareFromContinuingOperations contextRef="OneD" decimals="INF" unitRef="INRPerShare">-0.12</in-capmkt:BasicEarningsLossPerShareFromContinuingOperations><in-capmkt:DilutedEarningsLossPerShareFromContinuingOperations contextRef="OneD" decimals="INF" unitRef="INRPerShare">-0.12</in-capmkt:DilutedEarningsLossPerShareFromContinuingOperations><in-capmkt:BasicEarningsLossPerShareFromDiscontinuedOperations contextRef="OneD" decimals="INF" unitRef="INRPerShare">0</in-capmkt:BasicEarningsLossPerShareFromDiscontinuedOperations><in-capmkt:DilutedEarningsLossPerShareFromDiscontinuedOperations contextRef="OneD" decimals="INF" unitRef="INRPerShare">0</in-capmkt:DilutedEarningsLossPerShareFromDiscontinuedOperations><in-capmkt:BasicEarningsLossPerShareFromContinuingAndDiscontinuedOperations contextRef="OneD" decimals="INF" unitRef="INRPerShare">-0.12</in-capmkt:BasicEarningsLossPerShareFromContinuingAndDiscontinuedOperations><in-capmkt:DilutedEarningsLossPerShareFromContinuingAndDiscontinuedOperations contextRef="OneD" decimals="INF" unitRef="INRPerShare">-0.12</in-capmkt:DilutedEarningsLossPerShareFromContinuingAndDiscontinuedOperations><in-capmkt:DisclosureOfNotesOnFinancialResultsExplanatoryTextBlock contextRef="OneD">NOTES:-				 &lt;br /&gt; 
1	The above Unaudited Standalone Financial Results for the Quarter ended 30th June, 2026 were reviewed by the Audit Committee and thereafter approved at the meeting of the Board of Directors of the Company held on 07th August, 2026				 &lt;br /&gt; 
		 &lt;br /&gt; 
2	The capacity utilisation for first quarter was around 59%.				 &lt;br /&gt; 
					 &lt;br /&gt; 
3	The Company has only one segment (Building materials), therefore segment reporting is not applicable.				 &lt;br /&gt; 
					 &lt;br /&gt; 
4	Figures of previous periods have been regrouped/ reclassified wherever necessary to facilitate comparison.	 &lt;br /&gt; 
</in-capmkt:DisclosureOfNotesOnFinancialResultsExplanatoryTextBlock><in-capmkt:DescriptionOfOtherExpenses contextRef="OneExpenses1D">Other Expenses</in-capmkt:DescriptionOfOtherExpenses><in-capmkt:OtherExpenses contextRef="OneExpenses1D" decimals="-3" unitRef="INR">78792000</in-capmkt:OtherExpenses></xbrli:xbrl>