diff --git a/backend/protos/xyz/block/ftl/v1/language/language.pb.go b/backend/protos/xyz/block/ftl/v1/language/language.pb.go
index 15f26b4c8e..162978e442 100644
--- a/backend/protos/xyz/block/ftl/v1/language/language.pb.go
+++ b/backend/protos/xyz/block/ftl/v1/language/language.pb.go
@@ -140,13 +140,15 @@ type ModuleConfig struct {
 	DeployDir string `protobuf:"bytes,4,opt,name=deploy_dir,json=deployDir,proto3" json:"deploy_dir,omitempty"`
 	// Build is the command to build the module.
 	Build *string `protobuf:"bytes,5,opt,name=build,proto3,oneof" json:"build,omitempty"`
+	// Build lock path to prevent concurrent builds
+	BuildLock string `protobuf:"bytes,6,opt,name=build_lock,json=buildLock,proto3" json:"build_lock,omitempty"`
 	// The directory to generate protobuf schema files into. These can be picked up by language specific build tools
-	GeneratedSchemaDir *string `protobuf:"bytes,6,opt,name=generated_schema_dir,json=generatedSchemaDir,proto3,oneof" json:"generated_schema_dir,omitempty"`
+	GeneratedSchemaDir *string `protobuf:"bytes,7,opt,name=generated_schema_dir,json=generatedSchemaDir,proto3,oneof" json:"generated_schema_dir,omitempty"`
 	// Patterns to watch for file changes
-	Watch []string `protobuf:"bytes,7,rep,name=watch,proto3" json:"watch,omitempty"`
+	Watch []string `protobuf:"bytes,8,rep,name=watch,proto3" json:"watch,omitempty"`
 	// LanguageConfig contains any metadata specific to a specific language.
 	// These are stored in the ftl.toml file under the same key as the language (eg: "go", "java")
-	LanguageConfig *structpb.Struct `protobuf:"bytes,8,opt,name=language_config,json=languageConfig,proto3" json:"language_config,omitempty"`
+	LanguageConfig *structpb.Struct `protobuf:"bytes,9,opt,name=language_config,json=languageConfig,proto3" json:"language_config,omitempty"`
 }
 
 func (x *ModuleConfig) Reset() {
@@ -214,6 +216,13 @@ func (x *ModuleConfig) GetBuild() string {
 	return ""
 }
 
+func (x *ModuleConfig) GetBuildLock() string {
+	if x != nil {
+		return x.BuildLock
+	}
+	return ""
+}
+
 func (x *ModuleConfig) GetGeneratedSchemaDir() string {
 	if x != nil && x.GeneratedSchemaDir != nil {
 		return *x.GeneratedSchemaDir
@@ -567,13 +576,15 @@ type ModuleConfigDefaultsResponse struct {
 	DeployDir string `protobuf:"bytes,1,opt,name=deploy_dir,json=deployDir,proto3" json:"deploy_dir,omitempty"`
 	// Default build command
 	Build *string `protobuf:"bytes,2,opt,name=build,proto3,oneof" json:"build,omitempty"`
+	// Build lock path to prevent concurrent builds
+	BuildLock *string `protobuf:"bytes,3,opt,name=build_lock,json=buildLock,proto3,oneof" json:"build_lock,omitempty"`
 	// Default relative path to the directory containing generated schema files
-	GeneratedSchemaDir *string `protobuf:"bytes,3,opt,name=generated_schema_dir,json=generatedSchemaDir,proto3,oneof" json:"generated_schema_dir,omitempty"`
+	GeneratedSchemaDir *string `protobuf:"bytes,4,opt,name=generated_schema_dir,json=generatedSchemaDir,proto3,oneof" json:"generated_schema_dir,omitempty"`
 	// Default patterns to watch for file changes, relative to the module directory
-	Watch []string `protobuf:"bytes,4,rep,name=watch,proto3" json:"watch,omitempty"`
+	Watch []string `protobuf:"bytes,5,rep,name=watch,proto3" json:"watch,omitempty"`
 	// Default language specific configuration.
 	// These defaults are filled in by looking at each root key only. If the key is not present, the default is used.
-	LanguageConfig *structpb.Struct `protobuf:"bytes,5,opt,name=language_config,json=languageConfig,proto3" json:"language_config,omitempty"`
+	LanguageConfig *structpb.Struct `protobuf:"bytes,6,opt,name=language_config,json=languageConfig,proto3" json:"language_config,omitempty"`
 }
 
 func (x *ModuleConfigDefaultsResponse) Reset() {
@@ -620,6 +631,13 @@ func (x *ModuleConfigDefaultsResponse) GetBuild() string {
 	return ""
 }
 
+func (x *ModuleConfigDefaultsResponse) GetBuildLock() string {
+	if x != nil && x.BuildLock != nil {
+		return *x.BuildLock
+	}
+	return ""
+}
+
 func (x *ModuleConfigDefaultsResponse) GetGeneratedSchemaDir() string {
 	if x != nil && x.GeneratedSchemaDir != nil {
 		return *x.GeneratedSchemaDir
@@ -1834,7 +1852,7 @@ var file_xyz_block_ftl_v1_language_language_proto_rawDesc = []byte{
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@@ -1843,323 +1861,328 @@ var file_xyz_block_ftl_v1_language_language_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/backend/protos/xyz/block/ftl/v1/language/language.proto b/backend/protos/xyz/block/ftl/v1/language/language.proto
index 16af872ca5..6e9390e2e0 100644
--- a/backend/protos/xyz/block/ftl/v1/language/language.proto
+++ b/backend/protos/xyz/block/ftl/v1/language/language.proto
@@ -22,14 +22,16 @@ message ModuleConfig {
   string deploy_dir = 4;
   // Build is the command to build the module.
   optional string build = 5;
+  // Build lock path to prevent concurrent builds
+  string build_lock = 6;
   // The directory to generate protobuf schema files into. These can be picked up by language specific build tools
-  optional string generated_schema_dir = 6;
+  optional string generated_schema_dir = 7;
   // Patterns to watch for file changes
-  repeated string watch = 7;
+  repeated string watch = 8;
 
   // LanguageConfig contains any metadata specific to a specific language.
   // These are stored in the ftl.toml file under the same key as the language (eg: "go", "java")
-  google.protobuf.Struct language_config = 8;
+  google.protobuf.Struct language_config = 9;
 }
 
 // ProjectConfig contains the configuration for a project, found in the ftl-project.toml file.
@@ -92,15 +94,18 @@ message ModuleConfigDefaultsResponse {
   // Default build command
   optional string build = 2;
 
+  // Build lock path to prevent concurrent builds
+  optional string build_lock = 3;
+
   // Default relative path to the directory containing generated schema files
-  optional string generated_schema_dir = 3;
+  optional string generated_schema_dir = 4;
 
   // Default patterns to watch for file changes, relative to the module directory
-  repeated string watch = 4;
+  repeated string watch = 5;
 
   // Default language specific configuration.
   // These defaults are filled in by looking at each root key only. If the key is not present, the default is used.
-  google.protobuf.Struct language_config = 5;
+  google.protobuf.Struct language_config = 6;
 }
 
 message DependenciesRequest {
diff --git a/backend/protos/xyz/block/ftl/v1/language/mixins.go b/backend/protos/xyz/block/ftl/v1/language/mixins.go
index c12ed9bb8b..84c727dab3 100644
--- a/backend/protos/xyz/block/ftl/v1/language/mixins.go
+++ b/backend/protos/xyz/block/ftl/v1/language/mixins.go
@@ -119,6 +119,7 @@ func ModuleConfigToProto(config moduleconfig.AbsModuleConfig) (*ModuleConfig, er
 		Name:      config.Module,
 		Dir:       config.Dir,
 		DeployDir: config.DeployDir,
+		BuildLock: config.BuildLock,
 		Watch:     config.Watch,
 		Language:  config.Language,
 	}
@@ -147,6 +148,7 @@ func ModuleConfigFromProto(proto *ModuleConfig) moduleconfig.AbsModuleConfig {
 		Watch:              proto.Watch,
 		Language:           proto.Language,
 		Build:              proto.GetBuild(),
+		BuildLock:          proto.BuildLock,
 		GeneratedSchemaDir: proto.GetGeneratedSchemaDir(),
 	}
 	if proto.LanguageConfig != nil {
diff --git a/frontend/console/src/protos/xyz/block/ftl/v1/language/language_pb.ts b/frontend/console/src/protos/xyz/block/ftl/v1/language/language_pb.ts
index 2884736c6e..01da2d827b 100644
--- a/frontend/console/src/protos/xyz/block/ftl/v1/language/language_pb.ts
+++ b/frontend/console/src/protos/xyz/block/ftl/v1/language/language_pb.ts
@@ -48,17 +48,24 @@ export class ModuleConfig extends Message<ModuleConfig> {
    */
   build?: string;
 
+  /**
+   * Build lock path to prevent concurrent builds
+   *
+   * @generated from field: string build_lock = 6;
+   */
+  buildLock = "";
+
   /**
    * The directory to generate protobuf schema files into. These can be picked up by language specific build tools
    *
-   * @generated from field: optional string generated_schema_dir = 6;
+   * @generated from field: optional string generated_schema_dir = 7;
    */
   generatedSchemaDir?: string;
 
   /**
    * Patterns to watch for file changes
    *
-   * @generated from field: repeated string watch = 7;
+   * @generated from field: repeated string watch = 8;
    */
   watch: string[] = [];
 
@@ -66,7 +73,7 @@ export class ModuleConfig extends Message<ModuleConfig> {
    * LanguageConfig contains any metadata specific to a specific language.
    * These are stored in the ftl.toml file under the same key as the language (eg: "go", "java")
    *
-   * @generated from field: google.protobuf.Struct language_config = 8;
+   * @generated from field: google.protobuf.Struct language_config = 9;
    */
   languageConfig?: Struct;
 
@@ -83,9 +90,10 @@ export class ModuleConfig extends Message<ModuleConfig> {
     { no: 3, name: "language", kind: "scalar", T: 9 /* ScalarType.STRING */ },
     { no: 4, name: "deploy_dir", kind: "scalar", T: 9 /* ScalarType.STRING */ },
     { no: 5, name: "build", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
-    { no: 6, name: "generated_schema_dir", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
-    { no: 7, name: "watch", kind: "scalar", T: 9 /* ScalarType.STRING */, repeated: true },
-    { no: 8, name: "language_config", kind: "message", T: Struct },
+    { no: 6, name: "build_lock", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 7, name: "generated_schema_dir", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
+    { no: 8, name: "watch", kind: "scalar", T: 9 /* ScalarType.STRING */, repeated: true },
+    { no: 9, name: "language_config", kind: "message", T: Struct },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): ModuleConfig {
@@ -465,17 +473,24 @@ export class ModuleConfigDefaultsResponse extends Message<ModuleConfigDefaultsRe
    */
   build?: string;
 
+  /**
+   * Build lock path to prevent concurrent builds
+   *
+   * @generated from field: optional string build_lock = 3;
+   */
+  buildLock?: string;
+
   /**
    * Default relative path to the directory containing generated schema files
    *
-   * @generated from field: optional string generated_schema_dir = 3;
+   * @generated from field: optional string generated_schema_dir = 4;
    */
   generatedSchemaDir?: string;
 
   /**
    * Default patterns to watch for file changes, relative to the module directory
    *
-   * @generated from field: repeated string watch = 4;
+   * @generated from field: repeated string watch = 5;
    */
   watch: string[] = [];
 
@@ -483,7 +498,7 @@ export class ModuleConfigDefaultsResponse extends Message<ModuleConfigDefaultsRe
    * Default language specific configuration.
    * These defaults are filled in by looking at each root key only. If the key is not present, the default is used.
    *
-   * @generated from field: google.protobuf.Struct language_config = 5;
+   * @generated from field: google.protobuf.Struct language_config = 6;
    */
   languageConfig?: Struct;
 
@@ -497,9 +512,10 @@ export class ModuleConfigDefaultsResponse extends Message<ModuleConfigDefaultsRe
   static readonly fields: FieldList = proto3.util.newFieldList(() => [
     { no: 1, name: "deploy_dir", kind: "scalar", T: 9 /* ScalarType.STRING */ },
     { no: 2, name: "build", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
-    { no: 3, name: "generated_schema_dir", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
-    { no: 4, name: "watch", kind: "scalar", T: 9 /* ScalarType.STRING */, repeated: true },
-    { no: 5, name: "language_config", kind: "message", T: Struct },
+    { no: 3, name: "build_lock", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
+    { no: 4, name: "generated_schema_dir", kind: "scalar", T: 9 /* ScalarType.STRING */, opt: true },
+    { no: 5, name: "watch", kind: "scalar", T: 9 /* ScalarType.STRING */, repeated: true },
+    { no: 6, name: "language_config", kind: "message", T: Struct },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): ModuleConfigDefaultsResponse {
diff --git a/internal/buildengine/build.go b/internal/buildengine/build.go
index 6aa59e521a..25d00e2b05 100644
--- a/internal/buildengine/build.go
+++ b/internal/buildengine/build.go
@@ -21,7 +21,7 @@ var errInvalidateDependencies = errors.New("dependencies need to be updated")
 
 // Build a module in the given directory given the schema and module config.
 //
-// A lock file is used to ensure that only one build is running at a time.
+// Plugins must use a lock file to ensure that only one build is running at a time.
 //
 // Returns invalidateDependenciesError if the build failed due to a change in dependencies.
 func build(ctx context.Context, plugin languageplugin.LanguagePlugin, projectRootDir string, bctx languageplugin.BuildContext, buildEnv []string, devMode bool) (moduleSchema *schema.Module, deploy []string, err error) {
diff --git a/internal/buildengine/languageplugin/external_plugin.go b/internal/buildengine/languageplugin/external_plugin.go
index 5cde043ad6..790c08786f 100644
--- a/internal/buildengine/languageplugin/external_plugin.go
+++ b/internal/buildengine/languageplugin/external_plugin.go
@@ -162,6 +162,7 @@ func customDefaultsFromProto(proto *langpb.ModuleConfigDefaultsResponse) modulec
 		DeployDir:          proto.DeployDir,
 		Watch:              proto.Watch,
 		Build:              optional.Ptr(proto.Build),
+		BuildLock:          optional.Ptr(proto.BuildLock),
 		GeneratedSchemaDir: optional.Ptr(proto.GeneratedSchemaDir),
 		LanguageConfig:     proto.LanguageConfig.AsMap(),
 	}
diff --git a/internal/buildengine/languageplugin/plugin.go b/internal/buildengine/languageplugin/plugin.go
index 7efabf60df..a569fb6d33 100644
--- a/internal/buildengine/languageplugin/plugin.go
+++ b/internal/buildengine/languageplugin/plugin.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"os"
-	"path/filepath"
 	"time"
 
 	"github.com/alecthomas/kong"
@@ -339,7 +338,7 @@ func (p *internalPlugin) run(ctx context.Context) {
 
 func buildAndLoadResult(ctx context.Context, projectRoot, stubsRoot string, bctx BuildContext, buildEnv []string, devMode bool, watcher *watch.Watcher, build buildFunc) (BuildResult, error) {
 	config := bctx.Config.Abs()
-	release, err := flock.Acquire(ctx, filepath.Join(config.Dir, ".ftl.lock"), BuildLockTimeout)
+	release, err := flock.Acquire(ctx, config.BuildLock, BuildLockTimeout)
 	if err != nil {
 		return BuildResult{}, fmt.Errorf("could not acquire build lock for %v: %w", config.Module, err)
 	}
diff --git a/internal/moduleconfig/moduleconfig.go b/internal/moduleconfig/moduleconfig.go
index 745db87a51..e5e0e1ad23 100644
--- a/internal/moduleconfig/moduleconfig.go
+++ b/internal/moduleconfig/moduleconfig.go
@@ -24,6 +24,8 @@ type ModuleConfig struct {
 	Module   string `toml:"module"`
 	// Build is the command to build the module.
 	Build string `toml:"build"`
+	// BuildLock is file lock path to prevent concurrent builds of a module.
+	BuildLock string `toml:"build-lock"`
 	// DeployDir is the directory to deploy from, relative to the module directory.
 	DeployDir string `toml:"deploy-dir"`
 	// GeneratedSchemaDir is the directory to generate protobuf schema files into. These can be picked up by language specific build tools
@@ -54,6 +56,7 @@ type UnvalidatedModuleConfig ModuleConfig
 type CustomDefaults struct {
 	DeployDir          string
 	Watch              []string
+	BuildLock          optional.Option[string]
 	Build              optional.Option[string]
 	GeneratedSchemaDir optional.Option[string]
 
@@ -117,6 +120,7 @@ func (c ModuleConfig) Abs() AbsModuleConfig {
 	if !strings.HasPrefix(clone.DeployDir, clone.Dir) {
 		panic(fmt.Sprintf("deploy-dir %q is not beneath module directory %q", clone.DeployDir, clone.Dir))
 	}
+	clone.BuildLock = filepath.Clean(filepath.Join(clone.Dir, clone.BuildLock))
 	if clone.GeneratedSchemaDir != "" {
 		clone.GeneratedSchemaDir = filepath.Clean(filepath.Join(clone.Dir, clone.GeneratedSchemaDir))
 		if !strings.HasPrefix(clone.GeneratedSchemaDir, clone.Dir) {
@@ -142,6 +146,13 @@ func (c UnvalidatedModuleConfig) FillDefaultsAndValidate(customDefaults CustomDe
 	if defaultValue, ok := customDefaults.Build.Get(); ok && c.Build == "" {
 		c.Build = defaultValue
 	}
+	if c.BuildLock == "" {
+		if defaultValue, ok := customDefaults.BuildLock.Get(); ok {
+			c.BuildLock = defaultValue
+		} else {
+			c.BuildLock = ".ftl.lock"
+		}
+	}
 	if c.DeployDir == "" {
 		c.DeployDir = customDefaults.DeployDir
 	}
@@ -166,6 +177,9 @@ func (c UnvalidatedModuleConfig) FillDefaultsAndValidate(customDefaults CustomDe
 	if c.DeployDir == "" {
 		return ModuleConfig{}, fmt.Errorf("no deploy directory configured")
 	}
+	if c.BuildLock == "" {
+		return ModuleConfig{}, fmt.Errorf("no build lock path configured")
+	}
 	if !isBeneath(c.Dir, c.DeployDir) {
 		return ModuleConfig{}, fmt.Errorf("deploy-dir %s must be relative to the module directory %s", c.DeployDir, c.Dir)
 	}
diff --git a/internal/moduleconfig/moduleconfig_test.go b/internal/moduleconfig/moduleconfig_test.go
index 00fbfd055c..7079047650 100644
--- a/internal/moduleconfig/moduleconfig_test.go
+++ b/internal/moduleconfig/moduleconfig_test.go
@@ -23,6 +23,7 @@ func TestDefaulting(t *testing.T) {
 			},
 			defaults: CustomDefaults{
 				Build:              optional.Some("build"),
+				BuildLock:          optional.Some("customdefaultlock"),
 				DeployDir:          "deploydir",
 				GeneratedSchemaDir: optional.Some("generatedschemadir"),
 				Watch:              []string{"a", "b", "c"},
@@ -33,6 +34,7 @@ func TestDefaulting(t *testing.T) {
 				Module:             "nothingset",
 				Language:           "test",
 				Build:              "build",
+				BuildLock:          "customdefaultlock",
 				DeployDir:          "deploydir",
 				GeneratedSchemaDir: "generatedschemadir",
 				Watch:              []string{"a", "b", "c"},
@@ -44,6 +46,7 @@ func TestDefaulting(t *testing.T) {
 				Module:             "allset",
 				Language:           "test",
 				Build:              "custombuild",
+				BuildLock:          "custombuildlock",
 				DeployDir:          "customdeploydir",
 				GeneratedSchemaDir: "customgeneratedschemadir",
 				Watch:              []string{"custom1"},
@@ -64,6 +67,7 @@ func TestDefaulting(t *testing.T) {
 				Module:             "allset",
 				Language:           "test",
 				Build:              "custombuild",
+				BuildLock:          "custombuildlock",
 				DeployDir:          "customdeploydir",
 				GeneratedSchemaDir: "customgeneratedschemadir",
 				Watch:              []string{"custom1"},
@@ -103,6 +107,7 @@ func TestDefaulting(t *testing.T) {
 				Realm:     "home",
 				Dir:       "b",
 				Module:    "languageconfig",
+				BuildLock: ".ftl.lock",
 				Language:  "test",
 				LanguageConfig: map[string]any{
 					"alreadyset": "correct",