diff --git a/CHANGELOG.md b/CHANGELOG.md
index c85abca..d49b05b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# Unreleased
+
+Added
+  * AZ-1336: Add `zone_balancing_enabled` parameter
+
 # v6.3.0 - 2023-12-01
 
 Added
diff --git a/README.md b/README.md
index 26d3558..9fe359c 100644
--- a/README.md
+++ b/README.md
@@ -136,6 +136,7 @@ module "app_service_plan" {
 | stack | Project stack name | `string` | n/a | yes |
 | use\_caf\_naming | Use the Azure CAF naming provider to generate default resource name. `custom_name` override this if set. Legacy default name is used if this is set to `false`. | `bool` | `true` | no |
 | worker\_count | The number of Workers (instances) to be allocated. | `number` | `3` | no |
+| zone\_balancing\_enabled | Should the Service Plan balance across Availability Zones in the region. | `bool` | `true` | no |
 
 ## Outputs
 
diff --git a/resources.tf b/resources.tf
index a16db62..d081af4 100644
--- a/resources.tf
+++ b/resources.tf
@@ -4,8 +4,9 @@ resource "azurerm_service_plan" "plan" {
   location            = var.location
   resource_group_name = var.resource_group_name
 
-  os_type  = var.os_type
-  sku_name = var.sku_name
+  os_type                = var.os_type
+  sku_name               = var.sku_name
+  zone_balancing_enabled = var.zone_balancing_enabled
 
   worker_count                 = var.sku_name == "Y1" ? null : var.worker_count
   maximum_elastic_worker_count = var.maximum_elastic_worker_count
diff --git a/variables.tf b/variables.tf
index 5c48efd..79886e7 100644
--- a/variables.tf
+++ b/variables.tf
@@ -71,3 +71,9 @@ variable "per_site_scaling_enabled" {
   type        = bool
   default     = false
 }
+
+variable "zone_balancing_enabled" {
+  description = "Should the Service Plan balance across Availability Zones in the region."
+  type        = bool
+  default     = true
+}