diff --git a/web/gds-user-ui/src/components/AddressForm/index.tsx b/web/gds-user-ui/src/components/AddressForm/index.tsx
index 5d4525197..5ca57a308 100644
--- a/web/gds-user-ui/src/components/AddressForm/index.tsx
+++ b/web/gds-user-ui/src/components/AddressForm/index.tsx
@@ -2,7 +2,7 @@ import React, { useEffect } from 'react';
 import { Grid, GridItem, VStack } from '@chakra-ui/react';
 import InputFormControl from 'components/ui/InputFormControl';
 import SelectFormControl from 'components/ui/SelectFormControl';
-import { addressTypeOptions } from 'constants/address';
+import { addressTypeEnum, addressTypeOptions } from 'constants/address';
 import { getCountriesOptions } from 'constants/countries';
 import { Controller, useFormContext } from 'react-hook-form';
 import { getValueByPathname } from 'utils/utils';
@@ -28,7 +28,7 @@ const AddressForm: React.FC<AddressFormProps> = ({ name, rowIndex }) => {
 
   useEffect(() => {
     if (!getFirstAddressType) {
-      setValue(`entity.geographic_addresses[0].address_type`, 'ADDRESS_TYPE_CODE_BIZZ');
+      setValue(`entity.geographic_addresses[0].address_type`, addressTypeEnum.ADDRESS_TYPE_BIZZ);
     }
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [getFirstAddressType]);
@@ -109,7 +109,7 @@ const AddressForm: React.FC<AddressFormProps> = ({ name, rowIndex }) => {
                 <SelectFormControl
                   name={field.name}
                   ref={field.ref}
-                  defaultValue="ADDRESS_TYPE_CODE_BIZZ"
+                  defaultValue={addressTypeEnum.ADDRESS_TYPE_BIZZ}
                   isInvalid={!!getValueByPathname(errors, `${name}[${rowIndex}].address_type`)}
                   value={addressTypes.find((option) => option.value === field.value)}
                   onChange={(newValue: any) => field.onChange(newValue.value)}
diff --git a/web/gds-user-ui/src/components/Addresses/AddressList.tsx b/web/gds-user-ui/src/components/Addresses/AddressList.tsx
index 5942c6d6a..5af2e8cad 100644
--- a/web/gds-user-ui/src/components/Addresses/AddressList.tsx
+++ b/web/gds-user-ui/src/components/Addresses/AddressList.tsx
@@ -2,6 +2,7 @@ import { VStack, Box, Button } from '@chakra-ui/react';
 import { Trans } from '@lingui/react';
 import { useFormContext, useFieldArray } from 'react-hook-form';
 import Address from './Address';
+import { addressTypeEnum } from 'constants/address';
 
 function AddressList() {
   const { control } = useFormContext();
@@ -12,10 +13,9 @@ function AddressList() {
 
   const handleAddressClick = () => {
     append({
-      /* Set the default address type value for additional any addresses 
-      to match the default address type provided by backend. */
-      /* Add constant for address type that matches the backend. */
-      address_type: 'ADDRESS_TYPE_CODE_BIZZ',
+      /* Set the default address type value for any additional addresses 
+      to match the default address type provided by the backend. */
+      address_type: addressTypeEnum.ADDRESS_TYPE_BIZZ,
       address_line: ['', '', ''],
       country: ''
     });
diff --git a/web/gds-user-ui/src/constants/address.ts b/web/gds-user-ui/src/constants/address.ts
index ca7ebcd9d..a9db50a81 100644
--- a/web/gds-user-ui/src/constants/address.ts
+++ b/web/gds-user-ui/src/constants/address.ts
@@ -1,5 +1,6 @@
 import { t } from '@lingui/macro';
 
+// Use address type where users will be instructed to select a type (ie. address form component).
 export const addressType = {
   ADDRESS_TYPE_CODE_MISC: t`Unspecified`,
   ADDRESS_TYPE_CODE_HOME: t`Residential`,
@@ -7,6 +8,15 @@ export const addressType = {
   ADDRESS_TYPE_CODE_GEOG: t`Geographic`
 };
 
+// Use addressTypeEnum when the address type code is required when sending data to the backend.
+export const addressTypeEnum = {
+  ADDRESS_TYPE_MISC: 'ADDRESS_TYPE_CODE_MISC',
+  ADDRESS_TYPE_HOME: 'ADDRESS_TYPE_CODE_HOME',
+  ADDRESS_TYPE_BIZZ: 'ADDRESS_TYPE_CODE_BIZZ',
+  ADDRESS_TYPE_GEOG: 'ADDRESS_TYPE_CODE_GEOG'
+};
+
+// The addressTypeOptions is used to generate the options for the address type select form control.
 export const addressTypeOptions = () => {
   return Object.entries(addressType).map(([k, v]) => ({ value: k, label: v }));
 };
diff --git a/web/gds-user-ui/src/modules/dashboard/certificate/lib/defaultValues.ts b/web/gds-user-ui/src/modules/dashboard/certificate/lib/defaultValues.ts
index a93c4a71b..a20af4347 100644
--- a/web/gds-user-ui/src/modules/dashboard/certificate/lib/defaultValues.ts
+++ b/web/gds-user-ui/src/modules/dashboard/certificate/lib/defaultValues.ts
@@ -1,3 +1,5 @@
+import { addressTypeEnum } from "constants/address";
+
 export const getRegistrationDefaultValues = () => {
   return {
     entity: {
@@ -14,7 +16,7 @@ export const getRegistrationDefaultValues = () => {
       },
       geographic_addresses: [
         {
-          address_type: 'ADDRESS_TYPE_CODE_BIZZ',
+          address_type: addressTypeEnum.ADDRESS_TYPE_BIZZ,
           address_line: [],
           country: ''
         }