diff --git a/src/Bicep.Cli.IntegrationTests/BuildParamsCommandTests.cs b/src/Bicep.Cli.IntegrationTests/BuildParamsCommandTests.cs
index 66b6fc1be1d..07fec39c690 100644
--- a/src/Bicep.Cli.IntegrationTests/BuildParamsCommandTests.cs
+++ b/src/Bicep.Cli.IntegrationTests/BuildParamsCommandTests.cs
@@ -640,5 +640,67 @@ param intParam int
                 File.Exists(Path.Combine(bicepOutputPath, outputFile)).Should().Be(true, f);
             }
         }
+
+        [TestMethod]
+        public async Task BuildParams_Extends_InvalidType_ThrowsError()
+        {
+            var outputPath = FileHelper.GetUniqueTestOutputPath(TestContext);
+            FileHelper.SaveResultFile(TestContext, "main.bicep", @"
+            param tag string
+            ", outputPath);
+            FileHelper.SaveResultFile(TestContext, "base.bicepparam", @"
+            using none
+            param tag = 42
+            ", outputPath);
+            var inputFile = FileHelper.SaveResultFile(TestContext, "main.bicepparam", @"
+            using 'main.bicep'
+            extends 'base.bicepparam'
+            ", outputPath);
+
+            var expectedOutputFile = FileHelper.GetResultFilePath(TestContext, "main.json", outputPath);
+            File.Exists(expectedOutputFile).Should().BeFalse();
+
+            var (output, error, result) = await Bicep(["build-params", inputFile]);
+
+            File.Exists(expectedOutputFile).Should().BeFalse();
+
+            output.Should().BeEmpty();
+            error.Should().Contain("Error BCP033: Expected a value of type \"string\" but the provided value is of type \"42\".");
+            result.Should().Be(1);
+        }
+
+        [TestMethod]
+        public async Task BuildParams_Extends_Multiple_InvalidType_ThrowsMultipleErrors()
+        {
+            var outputPath = FileHelper.GetUniqueTestOutputPath(TestContext);
+            FileHelper.SaveResultFile(TestContext, "main.bicep", @"
+            param myString string
+            param myInt int
+            param myBool bool
+            ", outputPath);
+            FileHelper.SaveResultFile(TestContext, "base.bicepparam", @"
+            using none
+            param myInt = '42'
+            param myString = {}
+            param myBool = []
+            ", outputPath);
+            var inputFile = FileHelper.SaveResultFile(TestContext, "main.bicepparam", @"
+            using './main.bicep'
+            extends 'base.bicepparam'
+            ", outputPath);
+
+            var expectedOutputFile = FileHelper.GetResultFilePath(TestContext, "main.json", outputPath);
+            File.Exists(expectedOutputFile).Should().BeFalse();
+
+            var (output, error, result) = await Bicep(["build-params", inputFile]);
+
+            File.Exists(expectedOutputFile).Should().BeFalse();
+
+            output.Should().BeEmpty();
+            error.Should().Contain("Error BCP033: Expected a value of type \"int\" but the provided value is of type \"'42'\".");
+            error.Should().Contain("Error BCP033: Expected a value of type \"string\" but the provided value is of type \"object\".");
+            error.Should().Contain("Error BCP033: Expected a value of type \"bool\" but the provided value is of type \"<empty array>\".");
+            result.Should().Be(1);
+        }
     }
 }
diff --git a/src/Bicep.Core.IntegrationTests/ScenarioTests.cs b/src/Bicep.Core.IntegrationTests/ScenarioTests.cs
index 5cc339ad11e..9ef28474f55 100644
--- a/src/Bicep.Core.IntegrationTests/ScenarioTests.cs
+++ b/src/Bicep.Core.IntegrationTests/ScenarioTests.cs
@@ -7014,7 +7014,7 @@ public void DependsOn_order_is_deterministic_for_hierarchical_resource_symbolic_
                     }
                     tenantId: '00000000-0000-0000-0000-000000000000'
                   }
-                  
+
                   resource secret 'secrets' = {
                     name: 'secret'
                     properties: {}
@@ -7031,7 +7031,7 @@ public void DependsOn_order_is_deterministic_for_hierarchical_resource_symbolic_
                     }
                     tenantId: '00000000-0000-0000-0000-000000000000'
                   }
-                  
+
                   resource secret 'secrets' = {
                     name: 'secret'
                     properties: {}
@@ -7067,7 +7067,7 @@ public void DependsOn_on_existing_resource_triggers_languageVersion_2()
                 module empty 'empty.bicep' = {
                   name: 'foo'
                 }
-                
+
                 resource sa 'Microsoft.Storage/storageAccounts@2023-05-01' existing = {
                   name: 'storage'
                   dependsOn: [
diff --git a/src/Bicep.Core/Emit/EmitLimitationCalculator.cs b/src/Bicep.Core/Emit/EmitLimitationCalculator.cs
index 43bf65a5485..7c3155d0ccf 100644
--- a/src/Bicep.Core/Emit/EmitLimitationCalculator.cs
+++ b/src/Bicep.Core/Emit/EmitLimitationCalculator.cs
@@ -11,6 +11,7 @@
 using Bicep.Core.Navigation;
 using Bicep.Core.Semantics;
 using Bicep.Core.Semantics.Metadata;
+using Bicep.Core.SourceGraph;
 using Bicep.Core.Syntax;
 using Bicep.Core.Syntax.Visitors;
 using Bicep.Core.Text;
@@ -666,6 +667,18 @@ private static ImmutableDictionary<ParameterAssignmentSymbol, ParameterAssignmen
                     }
                 }
 
+                // TypeValidator.NarrowTypeAndCollectDiagnostics(model.TypeManager, model.Binder, model.SourceFile.ParsingErrorLookup, diagnostics, symbol.DeclaringSyntax, paramDefinitionFromBicepFile.Value.TypeReference.Type);
+                var bicepFile = model.SourceFileGrouping.SourceFiles.FirstOrDefault(sourceFile => sourceFile is BicepFile);
+                if (bicepFile is not null)
+                {
+                    var paramDefinitionFromBicepFile = model.ModelLookup.GetSemanticModel(bicepFile).Parameters.FirstOrDefault(e => e.Key == symbol.Name);
+
+                    if (paramDefinitionFromBicepFile.Value is not null && !TypeValidator.AreTypesAssignable(paramDefinitionFromBicepFile.Value.TypeReference.Type, symbol.Type))
+                    {
+                        diagnostics.WriteMultiple(DiagnosticBuilder.ForPosition(symbol.NameSource).ExpectedValueTypeMismatch(false, paramDefinitionFromBicepFile.Value.TypeReference.Type, symbol.Type));
+                    }
+                }
+
                 if (referencedValueHasError)
                 {
                     erroredSymbols.Add(symbol);