# Factory Canteen and Amenity Block Planning: What Sets the Size

> A factory canteen and amenity block is sized by the largest group that eats, washes or changes at the same moment, not by total headcount. Shift peaks set seating, serving lines and changing rooms; the kitchen must flow one way from raw to cooked to wash; exhaust, fire separation and grease traps shape the services; and walking time from the shop floor decides whether workers use it.

## The amenity block is tested twice a day, at the shift peak

A factory canteen and the washrooms and changing rooms around it look like simple
buildings. They are not. They are tested at the few moments in the day when a shift
breaks or changes, and almost all their design problems show up only then: a queue
that eats half the break, a changing room where a whole shift arrives at once, a
kitchen whose exhaust smell drifts into the dining hall, a drain that blocks every
week.

For a plant head the cost is lost minutes and morale. For a CFO it is an amenity
block that has to be extended, re-plumbed or re-ventilated within a few years, often
while the plant is running.

The common misconception is that **factory canteen design starts from headcount**. It
starts from the shift pattern. A site with many hundreds of employees spread across
shifts may need seating for only the largest group that eats at once, while a site
with fewer people on a single shift may need more seats than its total suggests.

## What sets the size of each part

Each element of the block is driven by a different peak. Getting one right does not
fix the others.

| Element | What drives its size | Who confirms it |
| --- | --- | --- |
| Dining seats | Largest group eating at the same time, after any staggering of breaks | Plant head with the designer |
| Serving lines | How many people must be served within the break | Designer and kitchen planner |
| Kitchen | Menu, meals per day, cooking method and equipment | Kitchen planner |
| Washrooms | Men and women on the largest shift, and the applicable codes | Plumbing designer and consultant |
| Changing rooms and lockers | Everyone arriving or leaving at shift change | Plant head with the designer |
| Hand-wash at canteen entry | How many enter at once | Designer |
| Water, drainage, grease trap | Kitchen and wash loads at peak | Plumbing designer |

## Shift peaks and serving speed

Seats are only half the sum. If the break is half an hour and the walk from the
farthest bay takes several minutes each way, the time left to queue, eat and return
the plate is short. **The serving rate, not the seat count, is usually the
bottleneck.**

Two levers resolve it: more serving lines, or staggered breaks. Staggering halves the
hall but doubles the pressure on the servery, so the two decisions have to be made
together. A worked plan of this trade-off, with a 200-seat workers' hall and a separate
staff hall fed from one servery, is shown in our
[industrial canteen design case study](/our-designs/industrial-canteen-design-200-seat-workers-dining).

Location follows the same logic. A canteen at the far edge of the site, or one reached
by crossing a truck yard, will be underused however well it is built.

## The kitchen flows one way: raw to cooked to wash

A canteen kitchen should run in one direction, with no route crossing back on itself:

1. **Receiving and stores.** Deliveries arrive at a service entrance, away from the
   dining entrance, into dry stores and cold storage.
2. **Preparation.** Vegetable, and where served, non-vegetarian preparation kept apart.
3. **Cooking.** Burners, tandoor or chapati lines, rice and bulk cooking under the
   exhaust hood.
4. **Serving.** Hot and cold counters facing the dining hall.
5. **Return and wash.** Used plates come back at a point that does not cross the
   serving queue, into a wash area with its own drainage.
6. **Waste out.** Food waste and refuse leave from the back of house, never through
   the hall.

The food business operating the canteen also has food safety licensing and hygiene
obligations, which affect finishes, washing provision and storage. The finishes and
fit-out of the servery and dining areas are covered in our
[pantry and cafeteria fit-out](/services/interior-fit-out/pantry-and-cafeteria-fit-out)
work.

## Exhaust, make-up air and fire separation

Cooking produces heat, smoke and grease-laden vapour. Three decisions shape the
building, so they cannot be left to the kitchen equipment supplier:

- **The exhaust duct route.** Grease-laden ducts need a route to outside that can be
  cleaned along its length, discharging where smell and smoke will not re-enter the
  building or reach the dining hall.
- **Make-up air.** A kitchen that exhausts air without a planned supply pulls it from
  the dining hall, corridors or toilets, carrying smells and flies with it.
- **Fire separation and suppression.** The separation of the kitchen from the dining
  hall, the treatment of the duct where it passes through other spaces, and any
  suppression in the hood are part of the fire design.

Ventilation provisions are set out in **NBC 2016, Part 8**, and fire and life safety
in **NBC 2016, Part 4**. What a particular building requires is determined by the
fire consultant, the MEP engineer and the authority having jurisdiction. The gas bank
position should be agreed with the site safety team and the gas supplier before the
layout is fixed, not after.

## Washrooms, changing rooms and drainage

Changing rooms see a sharper peak than the canteen: an entire shift arriving and
another leaving within minutes. Lockers, benches, showers where the process is dirty
or hot, and separate facilities for women all follow from that peak. Locating them
between the gate and the shop floor means workers change once, on the way in.

Drainage is the heaviest services load in the block. Kitchen and wash-area wastewater
passes through a **grease trap or interceptor** before it joins the drainage system,
placed where it can be emptied without carrying waste through the kitchen. Floors in
the kitchen, wash areas and toilets need falls to drains that actually work. Our
article on how [wet areas drive the services layout](/blog/wet-areas-pantries-and-washrooms-drive-the-services)
explains why these rooms should be placed before the rest of the plan.

Sanitation provisions sit in **IS 1172:1993** and **NBC 2016, Part 9**. Where effluent
goes to an on-site treatment plant, its consent conditions are set by the state
pollution control board, and the plumbing designer must design to them.

## The welfare framework

Welfare facilities in factories, including canteens, washrooms, rest rooms and
drinking water, are addressed in labour law: historically the Factories Act, 1948,
now consolidated into the Occupational Safety, Health and Working Conditions Code,
2020, with state rules setting much of the detail. Which provisions apply to a given
site depends on its workforce, location and the rules in force. That is for the
employer's legal and compliance advisers to confirm, and this article does not decide
it.

## Common mistakes

- **Sizing seats from total headcount.** The hall is too large, or the servery too
  small, because the shift pattern was never asked for.
- **Leaving the exhaust route to the equipment supplier.** The duct then has nowhere
  to go, or discharges next to an air intake.
- **No make-up air.** The kitchen pulls air, and smells, from the dining hall.
- **Plate return beside the queue.** Diners finishing walk against diners starting,
  twice a day.
- **Grease trap inside the kitchen.** Every emptying carries waste past food.
- **Changing rooms sized for the canteen peak.** Shift change is sharper.
- **Canteen placed for land convenience.** The walk consumes the break.

## What to ask before the amenity block is designed

- What is the shift pattern, and the largest group that eats, washes and changes at
  once?
- How many serving lines does that need within the break?
- What is the menu, and what cooking equipment does it require?
- Where does the kitchen exhaust go, and where does its make-up air come from?
- Where are the gas bank, grease trap, waste store and delivery access?
- What sanitation and welfare provisions apply, and who has confirmed them?
- How long is the walk from the farthest work area?

## Standards referenced

Fire and life safety in **NBC 2016, Part 4**; ventilation in **NBC 2016, Part 8**;
plumbing, drainage and sanitation in **NBC 2016, Part 9** and **IS 1172:1993**.
Welfare provisions under labour law, food safety obligations and effluent consent
conditions are separate frameworks. Seating, fittings, ventilation, fire separation and
drainage for a specific site must be established by the project's consultants, the
authority having jurisdiction and the employer's own advisers.

## Frequently asked questions

### How do you work out how many seats a factory canteen needs?

Start from the biggest group that eats at once, which depends on the shift pattern and how breaks are staggered, not from total employment. Then test it against serving speed: if one serving line cannot get that group fed within the break, either add a line or stagger the break. The break pattern is an operations decision, so settle it with the plant head before the plan is drawn.

### Where should the canteen be located on a factory site?

Close enough to the shop floor that the walk does not consume the break, with a route that does not cross truck yards or loading areas. It also needs a service side for deliveries, gas and waste that keeps those movements away from the workers' entrance. On large sites, the walking time to the farthest work area is the number to check.

### Why does a canteen kitchen need a grease trap?

Kitchen wastewater carries fats and oils that set in pipes as they cool, blocking drains and loading any treatment plant. A grease trap or interceptor separates them before the water joins the drainage system. Its size and position are set by the plumbing designer, and it must be placed where it can be emptied regularly without carrying waste through the kitchen.

### Does the canteen kitchen need fire separation from the dining hall?

Commercial kitchens carry cooking fire risk and grease-laden exhaust, so the separation of the kitchen, the exhaust duct route and any hood suppression are considered in the fire design. What a specific building requires is determined under NBC 2016 Part 4 by the fire consultant and the authority having jurisdiction, so involve them before the layout is frozen.

### How many toilets and changing rooms does a factory need?

The number of fittings depends on the occupancy, the number of men and women on the largest shift, and the applicable codes and labour rules. IS 1172 and NBC 2016 Part 9 give sanitation provisions, and welfare requirements sit in labour law. The project's consultant should establish the figures for your site rather than taking them from another plant.

### Can the canteen and washrooms be in one amenity block?

Often yes, and it can simplify water supply, drainage and supervision. The plan must keep toilets and changing rooms well separated from food preparation and serving, with no direct opening between them, and give the kitchen its own service access. Hand-wash points at the canteen entry are a separate item from the toilets.

## Sources

- [NBC 2016, Part 4](https://www.bis.gov.in/standards/national-building-code/) — Fire and life safety
- [NBC 2016, Part 8](https://www.bis.gov.in/standards/national-building-code/) — Building services - air conditioning, heating and mechanical ventilation
- [NBC 2016, Part 9](https://www.bis.gov.in/standards/national-building-code/) — Plumbing services - water supply, drainage and sanitation
- [IS 1172:1993](https://standards.bis.gov.in/website/published-standards/department-wise) — Code of basic requirements for water supply, drainage and sanitation

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Source: https://hagerstone.com/blog/factory-canteen-and-amenity-block-planning