Restrooms in Food-Service Venues: Planning Essentials

How to plan customer and staff restrooms in cafés and restaurants: location, size, ventilation, accessibility and hard-wearing finishes.

Strange as it may seem, one of the places that most shapes guests’ opinion of a restaurant is not the dining room but the restroom. A cramped, poorly ventilated, smelly toilet, or one that suddenly comes into view from the tables, can spoil the impression of even the best food. In planning terms, restrooms are also the least flexible zone: drainage falls, water supply and ventilation make them very hard to move later.

Choosing the location: start with the drains

The location of the restrooms depends first of all on where the building’s soil stack or drain connection is. Drain pipes work by gravity and need a certain fall. The further a toilet is from the stack, the more likely you are to need a raised floor, a step or a platform, and sometimes a pumped system. That costs both space and reliability.

From the guest’s point of view, the restroom should be easy to find from the dining room without being directly visible from the tables. A toilet door that opens straight towards a table is a typical annoyance. A short lobby or a handwashing area acts as a visual and odour barrier between neighbouring tables and the toilets.

Customer and staff facilities are separate

Kitchen staff using the customer toilets is a problem for both hygiene and workflow: the cook walks through the dining room and queues with guests. That is why a separate staff toilet, ideally with a changing room, is planned in the back-of-house area.

The relationship between the kitchen and toilets matters too. A toilet door should not open straight into a food preparation area; there should be a corridor or handwashing point in between. Specific sanitary requirements are checked against the regulations that apply to food businesses.

Number, size and accessibility

How many cubicles and washbasins are needed depends on the venue’s capacity and applicable standards. In practice, the number of washbasins matters as much as the number of cubicles: guests should not queue to wash their hands at peak times.

At least one toilet should be accessible to wheelchair users; beyond being good practice, this is often required. For such a cubicle, the door width, turning space, grab rails and a lower washbasin are shown in the design. Where many families with young children visit, a fold-down baby-changing table is a planned element rather than an afterthought.

Ventilation, odour and noise

Natural ventilation is rarely enough in restrooms. Mechanical extraction is sized so that air pressure in the restroom is slightly lower than in the dining room; that way odours go into the duct, not into the room. The fan’s noise level, ducts passing through neighbouring rooms and access for cleaning above the ceiling are also checked in the design.

Sound insulation deserves attention as well. Cubicle partitions and waste pipes should not transmit sound into the dining room. Wrapping pipes in acoustic lagging or choosing low-noise drainage systems reduces the problem.

Finishes and day-to-day use

Customer toilets are cleaned many times a day with strong cleaning products. Surfaces must therefore withstand moisture, chemicals and knocks: good-quality porcelain tiles, epoxy grout, wall-hung WCs and wall-mounted cubicle partitions make floor cleaning much easier.

Touch-free taps, soap dispensers and automatic flushing improve hygiene and help manage water use. A floor drain prevents water from pooling during cleaning. Access panels should be provided behind sanitary fittings and in front of concealed WC frames: being able to deal with a leak or blockage without removing tiles shortens the time the venue has to close. Lighting should be bright enough but arranged so that it does not cast shadows on faces at the mirror.

Planning checklist

• The toilets are close to the soil stack; the need for a platform or pump has been assessed.
• The door does not open directly towards tables.
• Separate staff facilities are located back-of-house.
• There is at least one accessible cubicle.
• Mechanical extraction and sound insulation have been sized.
• Finishes withstand intensive cleaning and there is a floor drain.

Zaferoğlu İnşaat handles design and renovation work for cafés, restaurants and other food-service venues. To plan the restrooms in your venue, you can visit our office in Babək Plaza.