diff --git a/provider/workspace_preset.go b/provider/workspace_preset.go
index e9c697c..e0f2276 100644
--- a/provider/workspace_preset.go
+++ b/provider/workspace_preset.go
@@ -2,6 +2,7 @@ package provider
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/hashicorp/terraform-plugin-sdk/v2/diag"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
@@ -103,8 +104,17 @@ func workspacePresetDataSource() *schema.Resource {
 										Description: "Time in seconds after which an unclaimed prebuild is considered expired and eligible for cleanup.",
 										Required:    true,
 										ForceNew:    true,
-										// Ensure TTL is between 0 and 31536000 seconds (1 year) to prevent stale prebuilds
-										ValidateFunc: validation.IntBetween(0, 31536000),
+										// Ensure TTL is either 0 (to disable expiration) or between 3600 seconds (1 hour) and 31536000 seconds (1 year)
+										ValidateFunc: func(val interface{}, key string) ([]string, []error) {
+											v := val.(int)
+											if v == 0 {
+												return nil, nil
+											}
+											if v < 3600 || v > 31536000 {
+												return nil, []error{fmt.Errorf("%q must be 0 or between 3600 and 31536000, got %d", key, v)}
+											}
+											return nil, nil
+										},
 									},
 								},
 							},
diff --git a/provider/workspace_preset_test.go b/provider/workspace_preset_test.go
index d9f7da4..b8e752a 100644
--- a/provider/workspace_preset_test.go
+++ b/provider/workspace_preset_test.go
@@ -157,7 +157,7 @@ func TestWorkspacePreset(t *testing.T) {
 					expiration_policy {}
 				}
 			}`,
-			ExpectError: regexp.MustCompile("The argument \"ttl\" is required, but no definition was found."),
+			ExpectError: regexp.MustCompile(`The argument "ttl" is required, but no definition was found.`),
 		},
 		{
 			Name: "Prebuilds is set with a expiration_policy field with its required fields",
@@ -186,6 +186,50 @@ func TestWorkspacePreset(t *testing.T) {
 				return nil
 			},
 		},
+		{
+			Name: "Prebuilds block with expiration_policy.ttl set to 0 seconds (disables expiration)",
+			Config: `
+			data "coder_workspace_preset" "preset_1" {
+				name = "preset_1"
+				parameters = {
+					"region" = "us-east1-a"
+				}
+				prebuilds {
+					instances = 1
+					expiration_policy {
+						ttl = 0
+					}
+				}
+			}`,
+			ExpectError: nil,
+			Check: func(state *terraform.State) error {
+				require.Len(t, state.Modules, 1)
+				require.Len(t, state.Modules[0].Resources, 1)
+				resource := state.Modules[0].Resources["data.coder_workspace_preset.preset_1"]
+				require.NotNil(t, resource)
+				attrs := resource.Primary.Attributes
+				require.Equal(t, attrs["name"], "preset_1")
+				require.Equal(t, attrs["prebuilds.0.expiration_policy.0.ttl"], "0")
+				return nil
+			},
+		},
+		{
+			Name: "Prebuilds block with expiration_policy.ttl set to 30 minutes (below 1 hour limit)",
+			Config: `
+			data "coder_workspace_preset" "preset_1" {
+				name = "preset_1"
+				parameters = {
+					"region" = "us-east1-a"
+				}
+				prebuilds {
+					instances = 1
+					expiration_policy {
+						ttl = 1800
+					}
+				}
+			}`,
+			ExpectError: regexp.MustCompile(`"prebuilds.0.expiration_policy.0.ttl" must be 0 or between 3600 and 31536000, got 1800`),
+		},
 		{
 			Name: "Prebuilds block with expiration_policy.ttl set to 2 years (exceeds 1 year limit)",
 			Config: `
@@ -201,7 +245,7 @@ func TestWorkspacePreset(t *testing.T) {
 					}
 				}
 			}`,
-			ExpectError: regexp.MustCompile(`expected prebuilds.0.expiration_policy.0.ttl to be in the range \(0 - 31536000\), got 63072000`),
+			ExpectError: regexp.MustCompile(`"prebuilds.0.expiration_policy.0.ttl" must be 0 or between 3600 and 31536000, got 63072000`),
 		},
 		{
 			Name: "Prebuilds is set with a expiration_policy field with its required fields and an unexpected argument",