A commercial coolroom should be sized from usable storage and peak stock movement, not empty floor area. Start with the menu, delivery frequency, crate and rack dimensions, then allow for aisles and airflow. After capacity, the decisions that matter most are operating temperature, panel construction, refrigeration system, floor, door, drainage, access, alarms and service support.
📋 What this guide covers
- How to estimate usable coolroom capacity
- Coolroom versus freezer room requirements
- Panels, floors, doors and shelving
- Self-contained versus remote refrigeration systems
- Site access, power, drainage and ventilation
- Questions to answer before requesting a quote
1. Size the stock, not the room
Begin with the busiest stock position, not an average Tuesday. List the products held, their incoming pack sizes, delivery frequency and the maximum days of cover. Measure crates, cartons, kegs, trays and trolleys.
Then design the shelving and floor storage. Subtract the space needed for the evaporator, doorway, safe aisle, cleaning access and air circulation. A room with a large external footprint can have disappointing usable capacity if the rack layout is an afterthought.
🔧 Pro tip: draw the racks first
Place shelving, crates and trolleys on a scaled plan before setting the room dimensions. It is easier to move a wall on paper than discover that a standard rack leaves an unusable strip along one side.
2. Decide what the room must hold
A coolroom for packaged drinks has a different hygiene, shelving and temperature brief from a room storing raw meat, dairy and ready-to-eat food. Define zones and keep raw products separated from ready-to-eat stock.
For potentially hazardous food, FSANZ generally requires 5°C or colder. Frozen food should remain frozen solid. Build monitoring and corrective action into the operating procedure rather than treating the refrigeration controller as the food-safety plan.
Read our commercial refrigeration temperature guide for daily checking and records.
3. Coolroom or freezer room?
A freezer room is not simply a coolroom with a lower thermostat. Lower temperatures change the insulation, door, floor, vapour sealing, defrost, drainage and refrigeration duty. Poor freezer-room design can cause ice, condensation and damage around the enclosure.
Tell the supplier the target temperature, product load, incoming product temperature and how often the door will open. If product needs rapid chilling or freezing, specify that separately; a storage room may not have the pull-down capacity for warm production.
4. Choose panels, floor and door for the site
- Panels: confirm thickness, insulation type, internal finish and how joints are sealed.
- Floor: decide whether the room needs an insulated floor, slip-resistant finish, ramp or recessed installation.
- Door: allow for the largest trolley or pallet movement, not only a person carrying a crate.
- Protection: add kick plates, bump rails or corner protection where trolleys will strike the enclosure.
- Safety: specify internal release, lighting and any alarm or emergency requirements appropriate to the room.
Food-premises surfaces need to be durable and cleanable. Confirm local fitout requirements with your designer, certifier and council before ordering.
5. Plan shelving and airflow together
Commercial shelving should be easy to clean, resistant to the stored environment and configured so stock is kept off the floor. Leave clearance around the evaporator and do not build racks that block the return-air path.
Use shelf depths that suit the containers. Over-deep shelves hide stock and encourage overloading; shallow shelves can waste the room. Label locations and apply first-in, first-out stock rotation so the capacity you buy is genuinely usable.
6. Select the refrigeration system
Self-contained or packaged systems can simplify some installations, while remote systems move heat and noise away from the room. The right choice depends on capacity, site layout, ventilation, distance between components, noise constraints and access for service.
The condenser must be able to reject heat. Placing it in a hot, enclosed ceiling or unventilated storeroom makes the system work harder. Give the refrigeration contractor realistic ambient conditions and simultaneous loads, especially where several systems share a plant area.
ℹ️ Storage load and pull-down load are different
Holding already-cold stock is easier than cooling a large delivery or production batch. Tell the designer how much product arrives, its temperature and how quickly it must be brought under control.
7. Check power, drainage and installation access
Confirm electrical supply, isolators, condensate drainage, floor levels and the route for pipework. Some systems need dedicated circuits or three-phase power. All electrical and refrigeration work must be completed by appropriately licensed trades.
Measure the full delivery path: loading area, gates, stairs, corridors, lifts, ceiling heights and the final assembly zone. Check whether panels can be carried in, whether outdoor work is weather dependent and where packaging will be removed.
Use the power, water and services planning guide before the site is closed up.
8. Monitoring, alarms and maintenance
Specify an easy-to-read temperature display and decide who checks it. For critical or high-value stock, consider independent logging and an alarm that reaches someone able to act outside trading hours.
Make condensers, evaporators, drains, fans and door seals accessible for cleaning and service. Ask who provides warranty support, which parts are stocked and what maintenance is required. A cheaper room that cannot be serviced without emptying or dismantling storage quickly becomes expensive.
9. The information to put in your quote request
- Internal usable dimensions or required storage volume
- Target temperature and products stored
- Maximum incoming product load and temperature
- Door openings and trading pattern
- Site ambient conditions
- Shelving, trolleys and largest item moving through the door
- Available power, drainage and plant location
- Delivery access and installation constraints
- Monitoring, alarm and service requirements
Final thoughts
A reliable coolroom starts with a clear operating brief. Map the stock and racks, separate holding from pull-down, design the enclosure and refrigeration as one system, and protect airflow and service access. The best result is not the biggest room; it is the room your team can load, clean, monitor and maintain safely.
Frequently Asked Questions
Calculate peak stock by crate, carton, keg, tray or trolley; design the shelving; then add safe aisles, evaporator clearance, doorway and airflow. Do not size from empty floor area alone.
Not by simply lowering the thermostat. Freezer operation can require different insulation, floor, door, vapour sealing, defrost, drainage and refrigeration capacity. Specify the target temperature from the start.
Potentially hazardous food generally needs to be kept at 5°C or colder. Set the room to maintain the food within that limit during normal loading and door opening, and verify with a probe thermometer.
