diff --git a/infrastructure/stacks/api-layer/iam_policies.tf b/infrastructure/stacks/api-layer/iam_policies.tf
index d91a2b28..560e9266 100644
--- a/infrastructure/stacks/api-layer/iam_policies.tf
+++ b/infrastructure/stacks/api-layer/iam_policies.tf
@@ -273,7 +273,7 @@ data "aws_iam_policy_document" "s3_audit_bucket_policy" {
   }
 }
 
-# Attach s3 write policy to external write role
+# Attach s3 write policy to lambda write role - rename below to lambda_s3_audit_write_policy
 resource "aws_iam_role_policy" "external_s3_write_policy" {
   name   = "S3WriteAccess"
   role   = aws_iam_role.eligibility_lambda_role.id
@@ -351,6 +351,7 @@ resource "aws_kms_key_policy" "s3_rules_kms_key" {
   policy = data.aws_iam_policy_document.s3_rules_kms_key_policy.json
 }
 
+# KMS key policy for consumer mapping file
 data "aws_iam_policy_document" "s3_consumer_mapping_kms_key_policy" {
   #checkov:skip=CKV_AWS_111: Root user needs full KMS key management
   #checkov:skip=CKV_AWS_356: Root user needs full KMS key management
@@ -755,3 +756,60 @@ resource "aws_iam_role_policy_attachment" "attach_rotation_sfn" {
   role       = aws_iam_role.rotation_sfn_role.name
   policy_arn = aws_iam_policy.rotation_sfn_policy.arn
 }
+
+#DQ policies
+# Policy doc for S3 DQ bucket
+data "aws_iam_policy_document" "s3_dq_bucket_policy" {
+  statement {
+    sid = "AllowSSLRequestsOnly"
+    actions = [
+      "s3:ListBucket",
+      "s3:GetBucketLocation",
+      "s3:GetObject",
+      "s3:PutObject",
+      "s3:DeleteObject", // Critical for Spark staging/committing
+      "s3:AbortMultipartUpload" // Important for large dataframes if job fails
+    ]
+    resources = [
+      module.s3_dq_metrics_bucket.storage_bucket_arn,
+      "${module.s3_dq_metrics_bucket.storage_bucket_arn}/*",
+    ]
+    condition {
+      test     = "Bool"
+      values = ["true"]
+      variable = "aws:SecureTransport"
+    }
+  }
+}
+
+# Attach DQ s3 write policy to external write role
+resource "aws_iam_role_policy" "external_dq_s3_write_policy" {
+  count = length(aws_iam_role.write_access_role)
+  name   = "S3DQWriteAccess"
+  role   = aws_iam_role.write_access_role[count.index].id
+  policy = data.aws_iam_policy_document.s3_dq_bucket_policy.json
+}
+
+# KMS access policy for S3 DQ bucket to external write role
+data "aws_iam_policy_document" "s3_dq_kms_access_policy" {
+  statement {
+    actions = [
+      "kms:Encrypt",
+      "kms:Decrypt",
+      "kms:ReEncrypt*",
+      "kms:GenerateDataKey*",
+      "kms:DescribeKey"
+    ]
+    resources = [
+      module.s3_dq_metrics_bucket.storage_bucket_kms_key_arn
+    ]
+  }
+}
+
+# Attach KMS policy to external write role
+resource "aws_iam_role_policy" "external_s3_kms_access_policy" {
+  count = length(aws_iam_role.write_access_role)
+  name   = "KMSAccessForS3DQ"
+  role   = aws_iam_role.write_access_role[count.index].id
+  policy = data.aws_iam_policy_document.s3_dq_kms_access_policy.json
+}
diff --git a/infrastructure/stacks/api-layer/s3_buckets.tf b/infrastructure/stacks/api-layer/s3_buckets.tf
index 54bff9df..fd2954a4 100644
--- a/infrastructure/stacks/api-layer/s3_buckets.tf
+++ b/infrastructure/stacks/api-layer/s3_buckets.tf
@@ -44,6 +44,11 @@ module "s3_lambda_artifact_bucket" {
   workspace    = terraform.workspace
 }
 
-output "lambda_artifact_bucket" {
-  value = module.s3_lambda_artifact_bucket.storage_bucket_name
+module "s3_dq_metrics_bucket" {
+  source       = "../../modules/s3"
+  bucket_name  = "dq-metrics"
+  environment  = var.environment
+  project_name = var.project_name
+  stack_name   = local.stack_name
+  workspace    = terraform.workspace
 }
diff --git a/infrastructure/stacks/iams-developer-roles/github_actions_policies.tf b/infrastructure/stacks/iams-developer-roles/github_actions_policies.tf
index 44d83346..ac774d86 100644
--- a/infrastructure/stacks/iams-developer-roles/github_actions_policies.tf
+++ b/infrastructure/stacks/iams-developer-roles/github_actions_policies.tf
@@ -231,6 +231,10 @@ resource "aws_iam_policy" "s3_management" {
           "arn:aws:s3:::*eligibility-signposting-api-${var.environment}-eli-artifacts/*",
           "arn:aws:s3:::*eligibility-signposting-api-${var.environment}-eli-artifacts-access-logs",
           "arn:aws:s3:::*eligibility-signposting-api-${var.environment}-eli-artifacts-access-logs/*",
+          "arn:aws:s3:::*eligibility-signposting-api-${var.environment}-dq-metrics",
+          "arn:aws:s3:::*eligibility-signposting-api-${var.environment}-dq-metrics/*",
+          "arn:aws:s3:::*eligibility-signposting-api-${var.environment}-dq-metrics-access-logs",
+          "arn:aws:s3:::*eligibility-signposting-api-${var.environment}-dq-metrics-access-logs/*",
         ]
       }
     ]