Grease trap requirements are often misunderstood as a simple hot-food rule. In practice the trigger is whether fats, oils and grease enter the drainage system, and the exemption test is about the cooking process rather than the menu category.
Why it matters commercially
If the building does not have a grease trap and your use requires one, budget roughly $30,000 – $40,000. It is a significant addition that appears on the feasibility review, not on the finish schedule.
What typically requires a grease trap
Any premises producing hot food with fats and oils — restaurants, cafes cooking on site, takeaways with frying, bakeries, commercial kitchens. The trade waste requirements apply to what leaves the kitchen in the wastewater, so a kitchen that fries, grills or roasts will almost always need one.
Where exemptions commonly apply
| Business type | Usually | Why |
|---|---|---|
| Ice cream parlour | Exempt in many cases | No hot food production, minimal fats to drain |
| Drinks shop, bubble tea | Exempt in many cases | No cooking, no fats |
| Bar | Often exempt | No significant grease load where food is not cooked |
| Light takeaway, sales-led | Sometimes exempt | Depends on whether food is prepared and cooked, or only sold |
The test is the process, not the label. A cafe that assembles sandwiches may not need one. The same cafe installing a fryer does. A bar serving only drinks is different from the same bar adding a grill kitchen.
What else is caught by the same review
Trade waste assessment usually runs alongside the exhaust and services review, because all three depend on the same equipment list. The practical items are:
- Grease interception — the trap itself, and where it can physically go. It needs access for servicing and pump-out, which in a tight tenancy is its own constraint.
- Trade waste agreement — the discharge arrangement with the water authority, which sets limits on what can enter the system.
- Floor waste and drainage capacity — commercial kitchens need adequate floor waste positions and drainage sized for the fixtures.
- Ventilation and grease-laden vapour — exhaust filtration, covered separately in our kitchen exhaust guide.
The second-hand kitchen advantage
This is where a previously operated food site becomes commercially attractive. An existing restaurant or cafe tenancy usually already has the grease trap, the exhaust riser, and the drainage. You are then modifying rather than installing from nothing, and the project carries a fraction of the risk.
We consistently advise clients on a limited budget to look for a tenancy that has already operated as a food business — a cafe or restaurant that did not trade well can become a different and successful concept with a facelift, a modification and a partial equipment change. The cost of entry is lower, the payback period is shorter, and the approval path is usually simpler because the use already exists.
Check before you sign
Three questions: does the tenancy already have a grease trap, does it have a working exhaust system, and is the gas and electrical supply adequate. If yes to all three, a hospitality fitout becomes a fitout. If no, it becomes a construction project with a services budget attached.
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