diff --git a/pkg/cluster/database.go b/pkg/cluster/database.go
index ba4cf223a..2ce0636b5 100644
--- a/pkg/cluster/database.go
+++ b/pkg/cluster/database.go
@@ -36,8 +36,8 @@ const (
 	createDatabaseSQL       = `CREATE DATABASE "%s" OWNER "%s";`
 	createDatabaseSchemaSQL = `SET ROLE TO "%s"; CREATE SCHEMA IF NOT EXISTS "%s" AUTHORIZATION "%s"`
 	alterDatabaseOwnerSQL   = `ALTER DATABASE "%s" OWNER TO "%s";`
-	createExtensionSQL      = `CREATE EXTENSION IF NOT EXISTS "%s" SCHEMA "%s"`
-	alterExtensionSQL       = `ALTER EXTENSION "%s" SET SCHEMA "%s"`
+	createExtensionSQL      = `SET ROLE TO "%s"; CREATE EXTENSION IF NOT EXISTS "%s" SCHEMA "%s"`
+	alterExtensionSQL       = `SET ROLE TO "%s"; ALTER EXTENSION "%s" SET SCHEMA "%s"`
 
 	globalDefaultPrivilegesSQL = `SET ROLE TO "%s";
 			ALTER DEFAULT PRIVILEGES GRANT USAGE ON SCHEMAS TO "%s","%s";
@@ -56,6 +56,13 @@ const (
 			ALTER DEFAULT PRIVILEGES IN SCHEMA "%s" GRANT EXECUTE ON FUNCTIONS TO "%s","%s";
 			ALTER DEFAULT PRIVILEGES IN SCHEMA "%s" GRANT USAGE ON TYPES TO "%s","%s";`
 
+	extensionPostCreateSQL = `
+			GRANT SELECT ON ALL TABLES IN SCHEMA "%s" TO "%s","%s";
+			GRANT SELECT ON ALL SEQUENCES IN SCHEMA "%s" TO "%s","%s";
+			GRANT INSERT, UPDATE, DELETE ON ALL TABLES IN SCHEMA "%s" TO "%s","%s";
+			GRANT USAGE, UPDATE ON ALL SEQUENCES IN SCHEMA "%s" TO "%s","%s";
+			GRANT EXECUTE ON ALL FUNCTIONS IN SCHEMA "%s" TO "%s","%s","%s";`
+
 	connectionPoolerLookup = `
 		CREATE SCHEMA IF NOT EXISTS {{.pooler_schema}};
 
@@ -418,6 +425,19 @@ func (c *Cluster) execAlterGlobalDefaultPrivileges(owner, rolePrefix string) err
 	return nil
 }
 
+func (c *Cluster) execExtensionPostCreatePrivileges(schemaName, rolePrefix string) error {
+	if _, err := c.pgDb.Exec(fmt.Sprintf(extensionPostCreateSQL,
+		schemaName, rolePrefix+constants.OwnerRoleNameSuffix, rolePrefix+constants.ReaderRoleNameSuffix, // tables
+		schemaName, rolePrefix+constants.OwnerRoleNameSuffix, rolePrefix+constants.ReaderRoleNameSuffix, // sequences
+		schemaName, rolePrefix+constants.OwnerRoleNameSuffix, rolePrefix+constants.WriterRoleNameSuffix, // tables
+		schemaName, rolePrefix+constants.OwnerRoleNameSuffix, rolePrefix+constants.WriterRoleNameSuffix, // sequences
+		schemaName, rolePrefix+constants.OwnerRoleNameSuffix, rolePrefix+constants.ReaderRoleNameSuffix, rolePrefix+constants.WriterRoleNameSuffix)); err != nil { // functions
+		return fmt.Errorf("could not set privileges in schema %s: %v", schemaName, err)
+	}
+
+	return nil
+}
+
 func makeUserFlags(rolsuper, rolinherit, rolcreaterole, rolcreatedb, rolcanlogin bool) (result []string) {
 	if rolsuper {
 		result = append(result, constants.RoleFlagSuperuser)
@@ -484,22 +504,22 @@ func (c *Cluster) getExtensions() (dbExtensions map[string]string, err error) {
 
 // executeCreateExtension creates new extension in the given schema.
 // The caller is responsible for opening and closing the database connection.
-func (c *Cluster) executeCreateExtension(extName, schemaName string) error {
-	return c.execCreateOrAlterExtension(extName, schemaName, createExtensionSQL,
+func (c *Cluster) executeCreateExtension(extName, schemaName, schemaOwner string) error {
+	return c.execCreateOrAlterExtension(extName, schemaName, schemaOwner, createExtensionSQL,
 		"creating extension", "create extension")
 }
 
 // executeAlterExtension changes the schema of the given extension.
 // The caller is responsible for opening and closing the database connection.
-func (c *Cluster) executeAlterExtension(extName, schemaName string) error {
-	return c.execCreateOrAlterExtension(extName, schemaName, alterExtensionSQL,
+func (c *Cluster) executeAlterExtension(extName, schemaName, schemaOwner string) error {
+	return c.execCreateOrAlterExtension(extName, schemaName, schemaOwner, alterExtensionSQL,
 		"changing schema for extension", "alter extension schema")
 }
 
-func (c *Cluster) execCreateOrAlterExtension(extName, schemaName, statement, doing, operation string) error {
+func (c *Cluster) execCreateOrAlterExtension(extName, schemaName, schemaOwner, statement, doing, operation string) error {
 
 	c.logger.Infof("%s %q schema %q", doing, extName, schemaName)
-	if _, err := c.pgDb.Exec(fmt.Sprintf(statement, extName, schemaName)); err != nil {
+	if _, err := c.pgDb.Exec(fmt.Sprintf(statement, schemaOwner, extName, schemaName)); err != nil {
 		return fmt.Errorf("could not execute %s: %v", operation, err)
 	}
 
diff --git a/pkg/cluster/sync.go b/pkg/cluster/sync.go
index 4937a2034..a1a062969 100644
--- a/pkg/cluster/sync.go
+++ b/pkg/cluster/sync.go
@@ -792,7 +792,7 @@ func (c *Cluster) syncPreparedDatabases() error {
 		}
 
 		// install extensions
-		if err := c.syncExtensions(preparedDB.Extensions); err != nil {
+		if err := c.syncExtensions(preparedDbName, preparedDB.Extensions); err != nil {
 			return err
 		}
 
@@ -836,7 +836,7 @@ func (c *Cluster) syncPreparedSchemas(databaseName string, preparedSchemas map[s
 	return nil
 }
 
-func (c *Cluster) syncExtensions(extensions map[string]string) error {
+func (c *Cluster) syncExtensions(databaseName string, extensions map[string]string) error {
 	c.setProcessName("syncing database extensions")
 
 	createExtensions := make(map[string]string)
@@ -857,12 +857,20 @@ func (c *Cluster) syncExtensions(extensions map[string]string) error {
 	}
 
 	for extName, schema := range createExtensions {
-		if err = c.executeCreateExtension(extName, schema); err != nil {
+		if err = c.executeCreateExtension(extName, schema, databaseName+constants.OwnerRoleNameSuffix); err != nil {
 			return err
 		}
+		// grant privileges on objects created by the extension to default database roles
+		if err = c.execExtensionPostCreatePrivileges(schema, databaseName); err != nil {
+			return err
+		}
+		// try to grant to default schema roles, too, but defaultRoles could be false for schema
+		if err = c.execExtensionPostCreatePrivileges(schema, databaseName+"_"+schema); err != nil {
+			c.logger.Debugf("no privileges assigned to schema roles: %v", err)
+		}
 	}
 	for extName, schema := range alterExtensions {
-		if err = c.executeAlterExtension(extName, schema); err != nil {
+		if err = c.executeAlterExtension(extName, schema, databaseName+constants.OwnerRoleNameSuffix); err != nil {
 			return err
 		}
 	}