New Grease Trap Installation vs Retrofit: What UAE Restaurant Owners Need to Know

Every commercial kitchen in the UAE needs a grease trap. That much is non-negotiable—Dubai Municipality, ADAFSA, and every emirate’s municipal authority mandate it. But how you get that trap installed depends entirely on your starting point. A brand-new restaurant being built from shell-and-core has different options, costs, and timelines than an existing restaurant that needs to upgrade or replace an undersized, aging, or non-compliant trap.

This guide compares new installations (during fit-out) with retrofits (upgrading an existing operational kitchen), covering the practical considerations, cost differences, and regulatory requirements that UAE restaurant owners and F&B operators face in each scenario.

New Installation During Fit-Out

Installing a grease trap during a new kitchen fit-out is the simplest, most cost-effective approach. The kitchen does not exist yet, so the trap can be incorporated into the drainage design from the beginning. No demolition, no plumbing modifications, no workaround engineering—the trap goes in the right place, at the right size, with the right connections, as part of the original construction.

Advantages of New Installation

Optimal placement: The trap location is chosen based on drainage efficiency, accessibility for cleaning, and proximity to the FOG-producing fixtures (sinks, dishwashers, floor drains). There are no constraints from existing plumbing—the plumbing is designed around the trap, not the other way around.

Correct sizing from day one: The trap is sized based on the planned menu, the number of fixtures, and the expected peak flow rate. There is no need to compromise on capacity due to space constraints imposed by existing infrastructure.

Lower installation cost: When the trap is part of the original MEP (mechanical, electrical, plumbing) design, the plumbing contractor installs the drainage connections during the rough-in phase alongside all other plumbing work. There is no premium for separate mobilisation, no need for demolition, and no additional structural work.

Municipality approval integration: The trap is included in the MEP drawings submitted for building permit and DM food permit approval. The inspector sees a complete, code-compliant design rather than a modification to an existing setup.

What New Installation Costs

For a new fit-out, the total installed cost of a grease trap includes the trap itself (PVC or stainless steel), drainage connections, any required structural work (for in-ground traps), and the plumber’s labour. Typical ranges:

• Under-counter PVC trap (50-200L): AED 500-1,500 installed
• Floor-mounted stainless steel trap (500-1,000L): AED 3,000-8,000 installed
• In-ground stainless steel trap (1,500-3,000L): AED 8,000-18,000 installed, including excavation and concrete work
• Industrial-scale trap (5,000L+): AED 20,000+ installed, depending on site conditions

These prices are for new fit-outs where the plumbing is being installed simultaneously. For material selection guidance, see our detailed cost guide.

Retrofit: Upgrading an Existing Kitchen

Retrofitting a grease trap into an existing operational kitchen is more complex, more expensive, and more disruptive than a new installation. But it is a reality that thousands of UAE restaurant owners face, for several reasons:

• The original fit-out was done without a proper grease trap (common in older buildings and informal food establishments)
• The existing trap is undersized for the current menu and production volume
• The existing trap is damaged, corroded, or at end of life
• Dubai Municipality or the relevant authority has issued a notice requiring upgrade
• The restaurant is changing cuisine type (e.g., from a cafe to a frying-heavy fast food concept) and the existing trap cannot handle the increased FOG load

Retrofit Challenges

Existing plumbing constraints: The drainage layout is already in place. The new or larger trap must connect to existing drain lines, which may not be in the ideal location or at the optimal gradient. Sometimes drainage lines need to be rerouted, which means cutting into floors and walls.

Space limitations: In an existing kitchen, every square metre is allocated. Finding space for a 1,000-litre trap in a kitchen that was designed without one often requires creative solutions: moving storage, repositioning equipment, or using outdoor or service corridor space if available.

Structural considerations: An in-ground trap requires excavation. In an existing building, you need to know what is under the floor before cutting into it: other utilities (electrical conduits, water supply lines, gas pipes), structural elements, and the floor slab thickness. A structural assessment is sometimes needed before an in-ground retrofit can proceed.

Kitchen downtime: A new installation happens before the kitchen opens, so there is no operational disruption. A retrofit happens in a working kitchen. The plumbing must be disconnected, the old trap removed (if replacing), the new trap installed, and everything reconnected and tested. This takes 1-3 days depending on complexity, during which the kitchen cannot operate—or operates at reduced capacity with temporary drainage arrangements.

The 30% Savings on Retrofit

While retrofitting is more complex than new installation, it is approximately 30% less expensive than a complete kitchen replumb. This is because a skilled retrofit preserves as much of the existing drainage infrastructure as possible, modifying only what is necessary to accommodate the new trap. The savings come from:

• Reusing existing drain lines where the gradient and diameter are adequate
• Minimising floor cutting by placing the trap above-ground (floor-mounted) instead of in-ground where possible
• Using the existing sewer connection point rather than creating a new one
• Scheduling the work during the restaurant’s closed hours to minimise lost revenue

A retrofit that would cost AED 12,000-15,000 if the entire drainage system were rebuilt can often be accomplished for AED 8,000-10,000 by working intelligently with the existing infrastructure.

When DM Mandates an Upgrade

Dubai Municipality can require a grease trap upgrade as a condition of food permit renewal or following an inspection finding. Common triggers include:

Undersized trap: The restaurant has expanded its menu or increased production volume since the original fit-out, and the existing trap can no longer handle the FOG load. DM inspectors assess trap condition and can determine that the trap is consistently overloaded.

Non-functional trap: The existing trap is damaged, bypassed, or so poorly maintained that it is not effectively separating FOG from the wastewater. DM may require replacement rather than repair if the trap is beyond serviceable condition.

Building code update: Changes to DM building codes or drainage standards may require existing installations to be brought into compliance. This is less common for individual restaurants but can affect entire buildings during major renovations.

Change of use: If a premises changes from a low-FOG use (e.g., a cafe) to a high-FOG use (e.g., a fast food restaurant), DM will require the grease trap to be upgraded to match the new use case.

When DM mandates an upgrade, there is typically a compliance deadline. Meeting that deadline requires a contractor who can assess, specify, procure, and install the new trap efficiently. Our installation team has extensive experience with DM-mandated upgrades and can manage the entire process from assessment to installation to DM re-inspection.

Minimising Kitchen Downtime During Retrofit

For a restaurant doing AED 5,000-15,000 per day in revenue, every day of kitchen closure during a retrofit is expensive. Here is how experienced contractors minimise downtime:

Pre-fabrication: The new trap, all connection fittings, and modified pipe sections are prepared offsite before the installation day. When the crew arrives, they are assembling pre-made components, not fabricating on site.

Off-hours scheduling: Installation is scheduled to start after the last service on Friday night and aims to be complete before Sunday lunch service (or Saturday night if the restaurant is closed Sunday). The restaurant loses one service day instead of three.

Phased approach: For complex retrofits, the work can be phased. Phase 1 (civil work, excavation, structural preparation) happens during a planned closure period. Phase 2 (trap installation and connection) happens over a single day. This splits the disruption into a less-critical preparatory phase and a short final installation phase.

Temporary bypass: In some cases, a temporary drainage arrangement can keep the kitchen partially operational while the retrofit is in progress. This is not always possible (it depends on the drainage layout), but when it is, it reduces revenue impact significantly.

New Build vs Retrofit: Decision Matrix

If you are deciding between renovating an existing space (with retrofit) versus building out a new shell-and-core space, factor the grease trap into your comparison:

• New build: Lower trap installation cost, optimal placement, no downtime impact, clean municipality approval process.
• Retrofit in existing F&B space: The previous tenant’s trap may be usable if it is the right size and in good condition. Inspect it thoroughly before assuming it is adequate for your menu.
• Retrofit in non-F&B space: The space has no grease trap at all. Full installation is needed, including potentially cutting into the floor for drainage connections. This is the most expensive retrofit scenario.

After Installation: Ongoing Maintenance

Whether your trap is newly installed or retrofitted, it requires regular professional cleaning from the first month of operation. FOG accumulation begins immediately, and a new trap that goes 3 months without its first cleaning will already be approaching the 25% capacity threshold that DM uses as the compliance benchmark.

GTC provides AMC plans starting from AED 99/month that cover scheduled cleaning, condition monitoring, and compliance documentation. For newly installed traps, we recommend an initial cleaning at 4-6 weeks to establish a baseline for the trap’s fill rate, then adjusting the ongoing schedule based on actual FOG accumulation data.

New trap installations also come with a settling-in period where drainage flows may need minor adjustment. Our installation team provides a post-installation check at 2 weeks to verify flow rates, seal integrity, and proper separation function.

Get Expert Advice

Whether you are fitting out a new restaurant or upgrading an existing kitchen, the grease trap decision has long-term cost and compliance implications. GTC has installed and retrofitted grease traps in every type of commercial kitchen across the UAE since 2009—from 50-litre under-counter units in cafe kiosks to 10,000-litre industrial traps in catering facilities.

We provide free site assessments for both new installations and retrofits, including drainage survey, trap sizing calculations, material recommendations, and a fixed-price installation quote. For existing kitchens, we can also assess your current trap’s condition and advise whether cleaning and maintenance will extend its life or whether replacement is the more economical path.

Call +971 58 570 7110 to schedule your site assessment, or visit our contact page to get started.