This guide is part of Commercial and Grease Trap. For the service itself, see our commercial grease trap services.
Opening or remodeling a Denver restaurant comes with a long list of moving parts. The grease trap cannot be treated like a last-minute appliance. Its size, location, piping, access, and inspection all need to work together.
Start planning before floors are poured, cabinets are set, or the kitchen equipment is locked into place. A good grease trap installation in Denver starts with the approved kitchen plan and the actual conditions at the property.
Does a new Denver restaurant need a grease trap?
Most commercial kitchens that prepare or serve food need an approved way to keep fats, oils, and grease out of the sewer. The exact equipment and approval process depend on the kitchen, building, wastewater provider, and local reviewing authority.
Do not assume an existing floor sink or small under-counter unit will satisfy the new use. A former coffee shop may not be set up for a full-service kitchen with fryers, prep sinks, and heavy dishwashing. A change in menu or equipment can change the grease load and the required design.
If you are unsure whether the project calls for a smaller indoor unit or a larger interceptor, review the practical differences between grease traps and interceptors before finalizing the kitchen layout.
How is a restaurant grease trap sized in Denver?
Grease trap sizing starts with the fixtures and expected flow, not the dining room's square footage alone. The final selection should follow the method accepted by the authority reviewing the specific Denver address.
The designer or plumbing contractor may need sink dimensions, compartment count, drain sizes, equipment discharge rates, and the proposed fixture schedule. Menu and operating style matter too. A bakery, burger shop, commissary kitchen, and bar do not send the same waste stream down the drain.
- List every prep sink, pot sink, floor sink, dishwasher, wok station, pre-rinse station, and other potential grease-producing fixture.
- Confirm which fixtures are required or permitted to connect to the grease waste line.
- Use manufacturer data for equipment that discharges water automatically.
- Account for peak kitchen activity rather than relying only on average daily use.
- Have the proposed size checked against the current requirements for the property's jurisdiction.
What information does the installer need before sizing?
The installer needs plans that match the restaurant you are actually building. Complete information reduces change orders and helps keep the installation aligned with the permit set.
| Project information | Why it matters |
|---|---|
| Kitchen equipment and fixture schedule | Shows which drains may carry grease-bearing wastewater. |
| Sink bowl dimensions and drain sizes | Supports the sizing calculation used by the designer or reviewer. |
| Menu and cooking methods | Helps identify the likely grease load and operating demands. |
| Existing plumbing plans | Shows connection points, pipe routes, vents, and possible conflicts. |
| Site and utility plan | Helps evaluate an outdoor interceptor location and sewer connection. |
| Manufacturer specifications | Confirms capacity, flow controls, access needs, and installation instructions. |
| Approved permit drawings | Establishes what inspectors expect to see in the finished work. |
Where should a grease trap be installed?
A grease trap should be close enough for workable plumbing and accessible enough for inspection and service. It should not be buried behind finished walls, permanent equipment, stored supplies, or a locked area that service crews cannot reach.
Indoor placement may save excavation but uses valuable kitchen or utility space. Outdoor placement may provide better service access, but it can require trenching, traffic-rated components, elevation checks, and surface restoration. The right choice comes from the building layout, sewer depth, approved design, and future access.
Grease waste line The dedicated drain piping that carries grease-bearing wastewater from approved kitchen fixtures to the grease trap or interceptor.
Its route affects floor cuts, pipe slope, cleanout locations, venting, equipment placement, and the point where treated flow reconnects with the building sewer.
Can a grease trap go inside or outside the restaurant?
A grease trap may be installed inside or outside when the selected equipment and location are approved for that use. Neither option is automatically right for every Denver restaurant.
An indoor unit must remain reachable without dismantling the kitchen. Check lid clearance, nearby work areas, floor drains, ventilation, and the path used to remove collected material. An outdoor interceptor needs accessible covers and a location where service equipment can work without crossing unsafe ground or blocking the site more than necessary.
Think beyond opening day. Staff may fill every open corner with shelving or storage once the restaurant gets busy. Protect the service area on the floor plan and in the operating plan.
What site conditions affect grease interceptor placement?
Sewer depth, pipe slope, soil, utilities, paving, and vehicle loads can all affect outdoor placement. These conditions should be checked before excavation begins.
A location that looks open may contain water, gas, electrical, communication, or fire service lines. The route may also cross a landlord-controlled drive, public right of way, loading area, or neighboring tenant space. Utility locating and site coordination belong in the schedule before digging.
Denver-area properties also vary in elevation and drainage layout. If gravity flow cannot be maintained, the design may need another solution. Do not change the approved piping route in the field without involving the project plumber, designer, and reviewing authority.
Which kitchen fixtures should connect to the grease trap?
Only fixtures shown and approved for the grease waste system should be connected. The correct list depends on the kitchen design and the rules applied to that address.
Prep sinks, pot sinks, floor sinks, and cooking equipment may be evaluated differently from restrooms, hand sinks, or other sanitary fixtures. Dishwashers and food waste equipment can also require special review. Sending the wrong fixtures through the unit can overload it, interfere with its operation, or fail inspection.
Mark every connection on the drawings and verify it during rough-in. Once tile, concrete, and equipment cover the piping, correcting a missed or incorrect branch becomes much harder.
What permits and approvals are needed for installation?
A restaurant grease trap project may require plumbing, building, wastewater, and site-related approvals. The exact permits vary by address and project scope, so confirm them with the city, county, wastewater provider, and property owner.
A Denver mailing address does not always tell you which agency serves the property. Restaurants elsewhere along the Front Range may follow different submittal forms, sizing methods, and inspection steps. Ask who has final authority before equipment is purchased.
- Confirm the wastewater service provider for the address.
- Ask which sizing method and equipment documentation are required.
- Submit drawings that show fixtures, piping, vents, cleanouts, and access.
- Wait for approval before ordering a unit that cannot be returned.
- Keep approved documents available for rough and final inspections.
What does a grease trap inspector check?
An inspector generally checks whether the installed system matches the approved plan and applicable code. Equipment size alone is not enough if the piping, access, venting, or connections are wrong.
Expect attention to the model and capacity, inlet and outlet arrangement, required flow-control components, cleanouts, venting, pipe materials, slope, and lid access. Outdoor work may also be checked for tank support, cover type, burial conditions, and protection from traffic loads. The actual checklist belongs to the authority serving the property.
When should grease trap installation happen during construction?
Grease trap work should be scheduled after the design is approved but before finishes block access to the piping. Outdoor excavation also needs to happen early enough to allow testing, inspection, backfill, and surface repair.
Coordinate the plumber, concrete crew, excavator, equipment supplier, landlord, and general contractor. Verify inspection hold points before anyone pours concrete or closes walls. Leave time for corrections because a failed inspection can delay kitchen equipment setup and the certificate needed to open.
If the restaurant will need ongoing pumping and support after opening, include restaurant grease trap service in Denver in the operating plan instead of waiting for an urgent problem.
What affects the cost of grease trap installation?
There is no dependable one-price range without plans and a site review. A compact indoor installation and a large buried interceptor are different jobs with different labor, materials, access, and restoration needs.
Cost moves with equipment size, pipe distance, concrete cutting, excavation depth, utility conflicts, traffic-rated covers, crane or machine access, permits, engineering, testing, and repair of floors or pavement. Working in an occupied building can add scheduling and containment needs. Changes made after approval usually cost more than decisions settled during design.
Ask for a written scope that separates the interceptor, plumbing, excavation, hauling, permits, inspections, electrical work if applicable, and surface restoration. That makes competing proposals easier to compare.
What should happen after the installation passes inspection?
After approval, collect the final plans, equipment manual, inspection record, and service access information. Train managers on what the unit serves and how to keep its covers reachable.
Record the model, rated capacity, access locations, and any special manufacturer instructions. Add the unit to the restaurant's maintenance calendar. Our commercial grease trap services can help the operator build a service plan around the installed equipment and actual kitchen use.
Regular Denver grease trap cleaning should include complete access to the unit and a check for visible damage or operating concerns. Installation records give the service crew a useful baseline.
Who can help plan a Denver grease trap installation?
Use a team that will review the site, communicate with the plumber, and explain access needs in plain language. The installer should be involved early enough to catch practical problems before they are buried under concrete.
Affordable Septic Pumping is a family-owned septic and grease company with more than two decades in the trade. To discuss plans or arrange a site visit, contact our service team or call 720-964-1034. Our office is at 8996 Pierce St., Westminster, CO 80021.
What do restaurant owners ask about grease trap installation?
Restaurant owners usually ask about timing, existing equipment, access, and inspection responsibility. These short answers can help you prepare, but the approved plan for the address controls the final installation.