In some hotels and restaurants, a service charge of around 10%—rising to 15% in plush spots—is added to the bill. If in doubt, ask whether service is included. In places where it's included, tipping isn't necessary unless you have received particularly good service. If there's no service charge, add a minimum of 10% to the total. Taxi drivers or hackney cab drivers, who make the trip for a prearranged sum, don't expect tips. There are few porters and plenty of baggage trolleys at airports, so tipping is usually not an issue; if you use a porter, €1 is the minimum. Tip hotel porters at least €1 per suitcase. Hairdressers normally expect about 10% of the total spent. You don't tip in pubs, but for waiter service in a bar, a hotel lounge, or a Dublin lounge bar, leave about €1. It's not customary to tip for regular concierge service.