diff --git a/modules/id5IdSystem.js b/modules/id5IdSystem.js
index a0745df37c8..488df984913 100644
--- a/modules/id5IdSystem.js
+++ b/modules/id5IdSystem.js
@@ -113,6 +113,11 @@ export const id5IdSubmodule = {
       return undefined;
     }
 
+    if (!hasWriteConsentToLocalStorage(consentData)) {
+      logInfo(LOG_PREFIX + 'Skipping ID5 local storage write because no consent given.')
+      return undefined;
+    }
+
     const resp = function (cbFunction) {
       new IdFetchFlow(submoduleConfig, consentData, cacheIdObj, uspDataHandler.getConsentData()).execute()
         .then(response => {
@@ -140,6 +145,11 @@ export const id5IdSubmodule = {
   extendId(config, consentData, cacheIdObj) {
     hasRequiredConfig(config);
 
+    if (!hasWriteConsentToLocalStorage(consentData)) {
+      logInfo(LOG_PREFIX + 'No consent given for ID5 local storage writing, skipping nb increment.')
+      return cacheIdObj;
+    }
+
     const partnerId = (config && config.params && config.params.partner) || 0;
     incrementNb(partnerId);
 
@@ -376,4 +386,19 @@ export function storeInLocalStorage(key, value, expDays) {
   storage.setDataInLocalStorage(`${key}`, value);
 }
 
+/**
+ * Check to see if we can write to local storage based on purpose consent 1, and that we have vendor consent (ID5=131)
+ * @param {ConsentData} consentData
+ * @returns {boolean}
+ */
+function hasWriteConsentToLocalStorage(consentData) {
+  const hasGdpr = consentData && typeof consentData.gdprApplies === 'boolean' && consentData.gdprApplies;
+  const localstorageConsent = deepAccess(consentData, `vendorData.purpose.consents.1`)
+  const id5VendorConsent = deepAccess(consentData, `vendorData.vendor.consents.${GVLID.toString()}`)
+  if (hasGdpr && (!localstorageConsent || !id5VendorConsent)) {
+    return false;
+  }
+  return true;
+}
+
 submodule('userId', id5IdSubmodule);
diff --git a/test/spec/modules/id5IdSystem_spec.js b/test/spec/modules/id5IdSystem_spec.js
index 8c0f8ad9cf3..392c11f3529 100644
--- a/test/spec/modules/id5IdSystem_spec.js
+++ b/test/spec/modules/id5IdSystem_spec.js
@@ -52,6 +52,18 @@ describe('ID5 ID System', function () {
     'signature': ID5_RESPONSE_SIGNATURE,
     'link_type': ID5_RESPONSE_LINK_TYPE
   };
+  const ALLOWED_ID5_VENDOR_DATA = {
+    purpose: {
+      consents: {
+        1: true
+      }
+    },
+    vendor: {
+      consents: {
+        131: true
+      }
+    }
+  }
 
   function getId5FetchConfig(storageName = ID5_STORAGE_NAME, storageType = 'html5') {
     return {
@@ -205,6 +217,37 @@ describe('ID5 ID System', function () {
     });
   });
 
+  describe('Check for valid consent', function() {
+    const dataConsentVals = [
+      [{purpose: {consents: {1: false}}}, {vendor: {consents: {131: true}}}, ' no purpose consent'],
+      [{purpose: {consents: {1: true}}}, {vendor: {consents: {131: false}}}, ' no vendor consent'],
+      [{purpose: {consents: {1: false}}}, {vendor: {consents: {131: false}}}, ' no purpose and vendor consent'],
+      [{purpose: {consents: undefined}}, {vendor: {consents: {131: true}}}, ' undefined purpose consent'],
+      [{purpose: {consents: {1: false}}}, {vendor: {consents: undefined}}], ' undefined vendor consent',
+      [undefined, {vendor: {consents: {131: true}}}, ' undefined purpose'],
+      [{purpose: {consents: {1: true}}}, {vendor: undefined}, ' undefined vendor'],
+      [{purpose: {consents: {1: true}}}, {vendor: {consents: {31: true}}}, ' incorrect vendor consent']
+    ];
+
+    dataConsentVals.forEach(function([purposeConsent, vendorConsent, caseName]) {
+      it('should fail with invalid consent because of ' + caseName, function() {
+        let dataConsent = {
+          gdprApplies: true,
+          consentString: 'consentString',
+          vendorData: {
+            purposeConsent, vendorConsent
+          }
+        }
+        expect(id5IdSubmodule.getId(config)).is.eq(undefined);
+        expect(id5IdSubmodule.getId(config, dataConsent)).is.eq(undefined);
+
+        let cacheIdObject = 'cacheIdObject';
+        expect(id5IdSubmodule.extendId(config)).is.eq(undefined);
+        expect(id5IdSubmodule.extendId(config, dataConsent, cacheIdObject)).is.eq(cacheIdObject);
+      });
+    });
+  });
+
   describe('Xhr Requests from getId()', function () {
     const responseHeader = {'Content-Type': 'application/json'};
 
@@ -248,7 +291,8 @@ describe('ID5 ID System', function () {
       let xhrServerMock = new XhrServerMock(sinon.createFakeServer())
       let consentData = {
         gdprApplies: true,
-        consentString: 'consentString'
+        consentString: 'consentString',
+        vendorData: ALLOWED_ID5_VENDOR_DATA
       }
 
       let submoduleResponse = callSubmoduleGetId(getId5FetchConfig(), consentData, undefined);
@@ -297,7 +341,8 @@ describe('ID5 ID System', function () {
       let xhrServerMock = new XhrServerMock(sinon.createFakeServer())
       let consentData = {
         gdprApplies: true,
-        consentString: 'consentString'
+        consentString: 'consentString',
+        vendorData: ALLOWED_ID5_VENDOR_DATA
       }
 
       let submoduleResponse = callSubmoduleGetId(getId5FetchConfig(), consentData, undefined);