Grease trap installation cost for a restaurant is influenced by various factors, including the size, model, and type required for a restaurant’s specific needs. For commercial kitchens that generate up to 100 gallons of fats, oils, and grease (FOG) daily, a smaller grease trap is typically sufficient and may range in cost from $250 to $1,500. However, larger establishments processing more wastewater from 750 to 1,500 gallons per day may require a larger grease trap and incur costs of up to $4,000. In general, grease trap installation cost can range between $1,000 and $5,000, depending upon the size, complexity of the unit, and associated installation requirements.