diff --git a/builtin/worktree.c b/builtin/worktree.c
index 2838254f7f2..dc9cd6decc8 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -335,6 +335,66 @@ static int add_worktree(const char *path, const char *refname,
 	strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
 	write_file(sb.buf, "../..");
 
+	/*
+	 * If the current worktree has sparse-checkout enabled, then copy
+	 * the sparse-checkout patterns from the current worktree.
+	 */
+	if (core_apply_sparse_checkout) {
+		char *from_file = git_pathdup("info/sparse-checkout");
+		char *to_file = xstrfmt("%s/worktrees/%s/info/sparse-checkout",
+					realpath.buf, name);
+
+		if (file_exists(from_file)) {
+			if (safe_create_leading_directories(to_file) ||
+			    copy_file(to_file, from_file, 0666))
+				error(_("failed to copy '%s' to '%s'; sparse-checkout may not work correctly"),
+				      from_file, to_file);
+		}
+
+		free(from_file);
+		free(to_file);
+	}
+
+	/*
+	 * If we are using worktree config, then copy all current config
+	 * values from the current worktree into the new one, that way the
+	 * new worktree behaves the same as this one.
+	 */
+	if (repository_format_worktree_config) {
+		char *from_file = git_pathdup("config.worktree");
+		char *to_file = xstrfmt("%s/worktrees/%s/config.worktree",
+					realpath.buf, name);
+
+		if (file_exists(from_file)) {
+			struct config_set cs = { { 0 }};
+			const char *str_value;
+			int bool_value;
+
+			if (safe_create_leading_directories(to_file) ||
+			    copy_file(to_file, from_file, 0666))
+				die(_("failed to copy worktree config from '%s' to '%s'"),
+				    from_file, to_file);
+
+			git_configset_init(&cs);
+			git_configset_add_file(&cs, from_file);
+
+			if (!git_configset_get_bool(&cs, "core.bare", &bool_value) &&
+			    bool_value &&
+			    git_config_set_multivar_in_file_gently(
+					to_file, "core.bare", NULL, "true", 0))
+				error(_("failed to unset 'core.bare' in '%s'"), to_file);
+			if (!git_configset_get_value(&cs, "core.worktree", &str_value) &&
+			    git_config_set_in_file_gently(to_file,
+							  "core.worktree", NULL))
+				error(_("failed to unset 'core.worktree' in '%s'"), to_file);
+
+			git_configset_clear(&cs);
+		}
+
+		free(from_file);
+		free(to_file);
+	}
+
 	strvec_pushf(&child_env, "%s=%s", GIT_DIR_ENVIRONMENT, sb_git.buf);
 	strvec_pushf(&child_env, "%s=%s", GIT_WORK_TREE_ENVIRONMENT, path);
 	cp.git_cmd = 1;
diff --git a/t/t1091-sparse-checkout-builtin.sh b/t/t1091-sparse-checkout-builtin.sh
index be6ea4ffe33..d929772be96 100755
--- a/t/t1091-sparse-checkout-builtin.sh
+++ b/t/t1091-sparse-checkout-builtin.sh
@@ -146,9 +146,9 @@ test_expect_success 'interaction with clone --no-checkout (unborn index)' '
 '
 
 test_expect_success 'set enables config' '
-	git init empty-config &&
+	git init worktree-config &&
 	(
-		cd empty-config &&
+		cd worktree-config &&
 		test_commit test file &&
 		test_path_is_missing .git/config.worktree &&
 		git sparse-checkout set nothing &&
@@ -201,6 +201,21 @@ test_expect_success 'add to sparse-checkout' '
 	check_files repo "a folder1 folder2"
 '
 
+test_expect_success 'worktree: add copies sparse-checkout patterns' '
+	cat repo/.git/info/sparse-checkout >old &&
+	test_when_finished cp old repo/.git/info/sparse-checkout &&
+	test_when_finished git -C repo worktree remove ../worktree &&
+	git -C repo sparse-checkout set "/*" &&
+	git -C repo worktree add --quiet ../worktree 2>err &&
+	test_must_be_empty err &&
+	new=repo/.git/worktrees/worktree/info/sparse-checkout &&
+	test_path_is_file $new &&
+	test_cmp repo/.git/info/sparse-checkout $new &&
+	git -C worktree sparse-checkout set --cone &&
+	test_cmp_config -C worktree true core.sparseCheckoutCone &&
+	test_must_fail git -C repo core.sparseCheckoutCone
+'
+
 test_expect_success 'cone mode: match patterns' '
 	git -C repo config --worktree core.sparseCheckoutCone true &&
 	rm -rf repo/a repo/folder1 repo/folder2 &&
@@ -520,13 +535,13 @@ test_expect_success 'interaction with submodules' '
 '
 
 test_expect_success 'different sparse-checkouts with worktrees' '
+	git -C repo sparse-checkout set --cone deep folder1 &&
 	git -C repo worktree add --detach ../worktree &&
-	check_files worktree "a deep folder1 folder2" &&
-	git -C worktree sparse-checkout init --cone &&
-	git -C repo sparse-checkout set folder1 &&
-	git -C worktree sparse-checkout set deep/deeper1 &&
-	check_files repo a folder1 &&
-	check_files worktree a deep
+	check_files worktree "a deep folder1" &&
+	git -C repo sparse-checkout set --cone folder1 &&
+	git -C worktree sparse-checkout set --cone deep/deeper1 &&
+	check_files repo "a folder1" &&
+	check_files worktree "a deep"
 '
 
 test_expect_success 'set using filename keeps file on-disk' '
diff --git a/t/t2400-worktree-add.sh b/t/t2400-worktree-add.sh
index 37ad79470fb..3fb5b21b943 100755
--- a/t/t2400-worktree-add.sh
+++ b/t/t2400-worktree-add.sh
@@ -165,8 +165,50 @@ test_expect_success '"add" default branch of a bare repo' '
 	(
 		git clone --bare . bare2 &&
 		cd bare2 &&
-		git worktree add ../there3 main
-	)
+		git worktree add ../there3 main &&
+		cd ../there3 &&
+		git status
+	) &&
+	cat >expect <<-EOF &&
+	init.t
+	EOF
+	ls there3 >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '"add" to bare repo with worktree config' '
+	(
+		git clone --bare . bare3 &&
+		cd bare3 &&
+		git config extensions.worktreeconfig true &&
+		git config --worktree core.bare true &&
+		git config --worktree core.worktree "$(pwd)" &&
+		git config --worktree bogus.key value &&
+		git config --unset core.bare &&
+		git worktree add ../there4 main &&
+		cd ../there4 &&
+		git status &&
+		git worktree add --detach ../there5 &&
+		cd ../there5 &&
+		git status
+	) &&
+
+	# the worktree has the arbitrary value copied.
+	test_cmp_config -C there4 value bogus.key &&
+	test_cmp_config -C there5 value bogus.key &&
+
+	# however, core.bare and core.worktree were removed.
+	test_must_fail git -C there4 config core.bare &&
+	test_must_fail git -C there4 config core.worktree &&
+
+	cat >expect <<-EOF &&
+	init.t
+	EOF
+
+	ls there4 >actual &&
+	test_cmp expect actual &&
+	ls there5 >actual &&
+	test_cmp expect actual
 '
 
 test_expect_success 'checkout with grafts' '
