diff --git a/CHANGELOG.md b/CHANGELOG.md
index 286cf2b4..0d4227a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@
 - Allow SDK dependencies to be embedded. [#922](https://github.com/yonaskolb/XcodeGen/pull/922) @k-thorat
 - Allow creating intermediary groups outside of the project directory. [#892](https://github.com/yonaskolb/XcodeGen/pull/892) @segiddins
 - Fix appex's Runpath Search Paths under macOS target. [#952](https://github.com/yonaskolb/XcodeGen/pull/952) @rinsuki
+- `onlyCopyFilesOnInstall` is extended for the Embed App Extensions build phase. [#948](https://github.com/yonaskolb/XcodeGen/pull/948) @RomanPodymov
 
 ## 2.17.0
 
diff --git a/Docs/ProjectSpec.md b/Docs/ProjectSpec.md
index 31ef26b0..3d4fb2f3 100644
--- a/Docs/ProjectSpec.md
+++ b/Docs/ProjectSpec.md
@@ -250,7 +250,7 @@ Settings are merged in the following order: groups, base, configs.
 - [ ] **transitivelyLinkDependencies**: **Bool** - If this is not specified the value from the project set in [Options](#options)`.transitivelyLinkDependencies` will be used.
 - [ ] **directlyEmbedCarthageDependencies**: **Bool** - If this is `true` Carthage dependencies will be embedded using an `Embed Frameworks` build phase instead of the `copy-frameworks` script. Defaults to `true` for all targets except iOS/tvOS/watchOS Applications.
 - [ ] **requiresObjCLinking**: **Bool** - If this is `true` any targets that link to this target will have `-ObjC` added to their `OTHER_LDFLAGS`. This is required if a static library has any catagories or extensions on Objective-C code. See [this guide](https://pewpewthespells.com/blog/objc_linker_flags.html#objc) for more details. Defaults to `true` if `type` is `library.static`. If you are 100% sure you don't have catagories or extensions on Objective-C code (pure Swift with no use of Foundation/UIKit) you can set this to `false`, otherwise it's best to leave it alone.
-- [ ] **onlyCopyFilesOnInstall**: **Bool** – If this is `true`, the `Embed Frameworks` build phase will have the "Copy only when installing" chekbox checked. Defaults to `false`.
+- [ ] **onlyCopyFilesOnInstall**: **Bool** – If this is `true`, the `Embed Frameworks` and `Embed App Extensions` (if available) build phases will have the "Copy only when installing" chekbox checked. Defaults to `false`.
 - [ ] **preBuildScripts**: **[[Build Script](#build-script)]** - Build scripts that run *before* any other build phases
 - [ ] **postCompileScripts**: **[[Build Script](#build-script)]** - Build scripts that run after the Compile Sources phase
 - [ ] **postBuildScripts**: **[[Build Script](#build-script)]** - Build scripts that run *after* any other build phases
diff --git a/Sources/XcodeGenKit/PBXProjGenerator.swift b/Sources/XcodeGenKit/PBXProjGenerator.swift
index 886cd70c..8a89814b 100644
--- a/Sources/XcodeGenKit/PBXProjGenerator.swift
+++ b/Sources/XcodeGenKit/PBXProjGenerator.swift
@@ -13,6 +13,8 @@ public class PBXProjGenerator {
     let projectDirectory: Path?
     let carthageResolver: CarthageDependencyResolver
 
+    public static let copyFilesActionMask: UInt = 8
+
     var sourceGenerator: SourceGenerator!
 
     var targetObjects: [String: PBXTarget] = [:]
@@ -979,6 +981,17 @@ public class PBXProjGenerator {
             return sourceFilesByCopyFiles.mapValues { getBuildFilesForSourceFiles($0) }
         }
 
+        func getPBXCopyFilesBuildPhase(dstSubfolderSpec: PBXCopyFilesBuildPhase.SubFolder, name: String, files: [PBXBuildFile]) -> PBXCopyFilesBuildPhase {
+            return PBXCopyFilesBuildPhase(
+                dstPath: "",
+                dstSubfolderSpec: dstSubfolderSpec,
+                name: name,
+                buildActionMask: target.onlyCopyFilesOnInstall ? PBXProjGenerator.copyFilesActionMask : PBXBuildPhase.defaultBuildActionMask,
+                files: files,
+                runOnlyForDeploymentPostprocessing: target.onlyCopyFilesOnInstall ? true : false
+            )
+        }
+        
         copyFilesBuildPhasesFiles.merge(getBuildFilesForCopyFilesPhases()) { $0 + $1 }
 
         buildPhases += try target.preBuildScripts.map { try generateBuildScript(targetName: target.name, buildScript: $0) }
@@ -1076,13 +1089,8 @@ public class PBXProjGenerator {
 
         if !extensions.isEmpty {
 
-            let copyFilesPhase = addObject(
-                PBXCopyFilesBuildPhase(
-                    dstPath: "",
-                    dstSubfolderSpec: .plugins,
-                    name: "Embed App Extensions",
-                    files: extensions
-                )
+            let copyFilesPhase = addObject(                
+                getPBXCopyFilesBuildPhase(dstSubfolderSpec: .plugins, name: "Embed App Extensions", files: extensions)
             )
 
             buildPhases.append(copyFilesPhase)
@@ -1105,16 +1113,8 @@ public class PBXProjGenerator {
         copyFrameworksReferences += getBuildFilesForPhase(.frameworks)
         if !copyFrameworksReferences.isEmpty {
 
-            let copyFilesActionMask: UInt = 8
             let copyFilesPhase = addObject(
-                PBXCopyFilesBuildPhase(
-                    dstPath: "",
-                    dstSubfolderSpec: .frameworks,
-                    name: "Embed Frameworks",
-                    buildActionMask: target.onlyCopyFilesOnInstall ? copyFilesActionMask : PBXBuildPhase.defaultBuildActionMask,
-                    files: copyFrameworksReferences,
-                    runOnlyForDeploymentPostprocessing: target.onlyCopyFilesOnInstall ? true : false
-                )
+                getPBXCopyFilesBuildPhase(dstSubfolderSpec: .frameworks, name: "Embed Frameworks", files: copyFrameworksReferences)
             )
 
             buildPhases.append(copyFilesPhase)
diff --git a/Tests/XcodeGenKitTests/ProjectGeneratorTests.swift b/Tests/XcodeGenKitTests/ProjectGeneratorTests.swift
index 1f2e329e..81c12d34 100644
--- a/Tests/XcodeGenKitTests/ProjectGeneratorTests.swift
+++ b/Tests/XcodeGenKitTests/ProjectGeneratorTests.swift
@@ -805,16 +805,91 @@ class ProjectGeneratorTests: XCTestCase {
                 let nativeTarget = try unwrap(pbxProject.nativeTargets.first(where: { $0.name == app.name }))
                 let buildPhases = nativeTarget.buildPhases
 
-                let embedFrameworkPhase = pbxProject
+                let embedFrameworksPhase = pbxProject
                     .copyFilesBuildPhases
                     .filter { buildPhases.contains($0) }
                     .first { $0.dstSubfolderSpec == .frameworks }
 
-                let phase = try unwrap(embedFrameworkPhase)
-                try expect(phase.buildActionMask) == 8
+                let phase = try unwrap(embedFrameworksPhase)
+                try expect(phase.buildActionMask) == PBXProjGenerator.copyFilesActionMask
                 try expect(phase.runOnlyForDeploymentPostprocessing) == true
             }
 
+            $0.it("copies files only on install in the Embed App Extensions step") {
+                let appExtension = Target(
+                    name: "AppExtension",
+                    type: .appExtension,
+                    platform: .tvOS
+                )
+
+                let app = Target(
+                    name: "App",
+                    type: .application,
+                    platform: .tvOS,
+                    dependencies: [
+                        Dependency(type: .target, reference: "AppExtension")
+                    ],
+                    onlyCopyFilesOnInstall: true
+                )
+
+                let project = Project(name: "test", targets: [app, appExtension])
+                let pbxProject = try project.generatePbxProj()
+                let nativeTarget = try unwrap(pbxProject.nativeTargets.first(where: { $0.name == app.name }))
+                let buildPhases = nativeTarget.buildPhases
+
+                let embedAppExtensionsPhase = pbxProject
+                    .copyFilesBuildPhases
+                    .filter { buildPhases.contains($0) }
+                    .first { $0.dstSubfolderSpec == .plugins }
+
+                let phase = try unwrap(embedAppExtensionsPhase)
+                try expect(phase.buildActionMask) == PBXProjGenerator.copyFilesActionMask
+                try expect(phase.runOnlyForDeploymentPostprocessing) == true
+            }
+
+            $0.it("copies files only on install in the Embed Frameworks and Embed App Extensions steps") {
+                let appExtension = Target(
+                    name: "AppExtension",
+                    type: .appExtension,
+                    platform: .tvOS
+                )
+
+                let app = Target(
+                    name: "App",
+                    type: .application,
+                    platform: .tvOS,
+                    dependencies: [
+                        Dependency(type: .target, reference: "AppExtension"),
+                        Dependency(type: .framework, reference: "FrameworkA.framework"),
+                        Dependency(type: .framework, reference: "FrameworkB.framework", embed: false),
+                    ],
+                    onlyCopyFilesOnInstall: true
+                )
+
+                let project = Project(name: "test", targets: [app, appExtension])
+                let pbxProject = try project.generatePbxProj()
+                let nativeTarget = try unwrap(pbxProject.nativeTargets.first(where: { $0.name == app.name }))
+                let buildPhases = nativeTarget.buildPhases
+
+                let embedFrameworksPhase = pbxProject
+                    .copyFilesBuildPhases
+                    .filter { buildPhases.contains($0) }
+                    .first { $0.dstSubfolderSpec == .frameworks }
+
+                let embedFrameworksPhaseValue = try unwrap(embedFrameworksPhase)
+                try expect(embedFrameworksPhaseValue.buildActionMask) == PBXProjGenerator.copyFilesActionMask
+                try expect(embedFrameworksPhaseValue.runOnlyForDeploymentPostprocessing) == true
+                
+                let embedAppExtensionsPhase = pbxProject
+                    .copyFilesBuildPhases
+                    .filter { buildPhases.contains($0) }
+                    .first { $0.dstSubfolderSpec == .plugins }
+
+                let embedAppExtensionsPhaseValue = try unwrap(embedAppExtensionsPhase)
+                try expect(embedAppExtensionsPhaseValue.buildActionMask) == PBXProjGenerator.copyFilesActionMask
+                try expect(embedAppExtensionsPhaseValue.runOnlyForDeploymentPostprocessing) == true
+            }
+            
             $0.it("sets -ObjC for targets that depend on requiresObjCLinking targets") {
                 let requiresObjCLinking = Target(
                     name: "requiresObjCLinking",