GREASE TRAPS PRICING & DESIGN

The cost of supplying and installing a grease trap can vary significantly depending on several factors, including:

  • The location of the installation

  • Ease of access and installation difficulty

  • Distance between the kitchen and the proposed grease trap location

  • Whether pump stations are required upstream or downstream of the grease trap

  • Whether the grease trap is installed above ground or below ground

  • The required grease trap capacity

  • The type and manufacturer of the grease trap

  • Whether the installation is located in a traffic-able or pedestrian area

  • Venting requirements and associated installation challenges

  • Site-specific plumbing and drainage requirements

Supply & Installation Costs

As a general guide:

  • With straightforward access, pricing may start from approximately $8,000 including supply and installation.

  • Typically range between $10,000 and $15,000.

  • Particularly those requiring excavation, pump stations, extensive pipework, or difficult access, can exceed $16k-25k+

Grease Trap Supply Only Prices

Grease trap supply costs vary depending on size and specification:

  • Pricing may start from $2700-3,500

  • Commonly used for larger restaurants and commercial kitchens): approximately $4,300-6,500

  • Larger capacity grease traps are available for high-volume food service operations and are priced accordingly.

Complete Commercial Fit-Out Services

In addition to grease trap installations, The Plumbing Co. provides complete commercial plumbing, gas, and electrical services for:

  • Commercial kitchens

  • Cafés and restaurants

  • Bars and hospitality venues

  • Commercial bathrooms and amenities

  • Shop and tenancy fit-outs

  • Food preparation facilities

Please note that the grease trap pricing outlined above covers the grease trap installation only and does not include commercial kitchen plumbing, gas fitting, electrical works, fixtures, appliances, or bathroom fit-outs.

If you're planning a new venue, renovation, or commercial fit-out, our team can provide a comprehensive site assessment and quotation for the entire project, ensuring all plumbing, gas, electrical, drainage, and grease management requirements are considered from the outset.

Request a Site Assessment

Because every commercial kitchen and site is different, we recommend a site inspection before providing a fixed quotation. This allows us to assess the most suitable grease trap size, installation method, and any site-specific requirements to provide an accurate price.

Book free onsite quote
Learn more about our commercial Services
Learn more about our commercial Services

A grease trap separates fats, oils, and grease (FOG) from wastewater before it enters the sewer system. Inside the grease trap is a partition known as a baffle wall.

As wastewater enters the tank:

  1. Fats, oils, and grease float to the surface because they are lighter than water.

  2. The baffle slows the flow of water through the tank.

  3. Grease accumulates on the surface.

  4. Cleaner water passes underneath the baffle.

  5. The treated water exits the grease trap and enters the sewer system.

This simple process prevents grease from entering Water Corporation infrastructure and causing costly sewer blockages.

Diagram of a grease trap showing inflow and outflow pipes, baffle wall, grease layer, solid waste at the bottom, and manhole covers.

How Does A Grease Trap Work?

WHAT IS THE BEST MATERIAL FOR A GREASE TRAP?

  • HDPE is widely regarded as one of the best materials available for grease trap construction.

    • Lightweight and easy to transport.

    • Extremely durable.

    • Corrosion resistant.

    • Excellent chemical resistance.

    • Smooth internal surfaces.

    • Fat and grease are less likely to adhere to the walls.

    • Long service life.

    • For most commercial applications, HDPE grease traps offer the best balance between durability, performance, and installation practicality.

  • Water Corporation may assess:

    • Type of business.

    • Menu and food preparation methods.

    • Expected wastewater generation.

    • Seating capacity.

    • Trade waste output.

  • This is the most common sizing method.

    Each fixture within the premises is allocated a fixture unit rating.

    Examples include:

    • Pot sinks

    • Wash-up sinks

    • Floor wastes

    • Dishwashers

    • Hand basins

    • Preparation sinks

    The total fixture unit count determines the required grease trap size.

    FIXTURE UNITS

    • In some situations, restaurant seating capacity may also be considered when determining grease trap sizing requirements. The larger the venue and customer volume, the larger the grease trap typically required.

How Is Grease Trap Size Determined?

Construction site with blue insulation boards, PVC pipes, a measuring tape, a manhole cover, and other tools on a blue and beige floor.

Need A Grease Trap Installed In Perth?

We provide:

✔ Grease Trap Design

✔ Water Corporation Trade Waste Assistance

✔ Above-Ground Grease Traps

✔ Below-Ground Grease Traps

✔ Pump Stations & Lifting Stations

✔ Grease Trap Replacements

✔ Commercial Plumbing Works

✔ Grease Trap Servicing & Maintenance

Whether you're opening a new cafe, upgrading an existing restaurant, replacing a non-compliant grease trap, or responding to a Water Corporation requirement, our team can help.

Contact The Plumbing & Electrical Co today for afree on-site grease trap assessment anywhere in Perth.