---
title: "7 Signs Your Restaurant Drain Needs a Maintenance Contract"
description: "Restaurant drains fail faster than domestic ones. These 7 signs tell you when ad-hoc callouts are costing more than a proper maintenance contract would."
author: "Drains Cleared Engineering Team"
published_at: 2026-05-28
canonical: "https://drainscleared.co.uk/help-and-advice/restaurant-drain-maintenance-contract-signs"
tags: ["restaurant drains","commercial drainage","drain maintenance contract","grease trap"]
---A restaurant's drainage system handles food waste, fats, oils, grease, and hot water at volumes that would overwhelm a domestic drain in weeks. Most restaurants manage drainage reactively — calling out when something blocks. However, by the time a restaurant drain blocks during service, the cost is already significant: emergency callout charges, service disruption, potentially a kitchen closure, and the reputational damage of turning covers away.

A planned maintenance contract prevents all of this. Here are the seven signs that ad-hoc callouts are no longer sufficient.

## 1. You've had more than one callout in a six-month period

However, a single emergency drain clearance is bad luck. Two in six months is a pattern. Each callout costs £150–£400 depending on time of day and complexity. A quarterly maintenance contract covering [high-pressure jetting](/drains/drain-jetting) and inspection typically costs less than two emergency callouts — and prevents them.

## 2. Drains slow during peak service

Additionally, if kitchen or pot-wash drains drain slowly during busy periods — when flow rates are highest — you have a partial blockage that restricts capacity under load but does not yet fully block. This will worsen. The threshold from "slow during service" to "blocked during service" is usually a matter of weeks. Preventive jetting at this stage is far cheaper than a blocked drain during a Saturday evening service.

## 3. You have a grease trap that has not been serviced in over 3 months

Specifically, grease interceptors and traps require regular emptying and cleaning to function correctly. A full grease trap bypasses its purpose entirely — grease passes through into the drainage system and builds up downstream. Local authority environmental health officers treat overflowing grease traps as a breach of trade effluent consent. Quarterly servicing is the minimum for a high-volume kitchen.

## 4. You can smell drains in the kitchen or dining area

For example, drain odours in a food preparation or dining area are a direct food hygiene risk under HACCP principles. They indicate either a blocked drain, a dry trap, or a cracked underground pipe allowing sewer gases to enter the building. Any of these requires professional investigation. [Environmental health inspectors](/help-and-advice/commercial-drain-maintenance-guide) treat persistent drain odours as a potential Category 2 contaminant risk.

## 5. You have trees or planting near the kitchen drain run

As a result of the warm, nutrient-rich conditions in restaurant drain pipes, [root ingress](/help-and-advice/tree-roots-in-drains) is faster in commercial drains than in domestic ones. Trees within 10 metres of underground drain runs should trigger an annual [CCTV drain survey](/drains/cctv-drain-survey) at minimum. Root ingress detected early is cleared by mechanical cutting and jetting. Detected after collapse, it requires excavation.

## 6. Your drains are more than 20 years old without a survey

Furthermore, commercial drains receive far more mechanical and thermal stress than domestic ones. Hot, fat-laden discharge, heavy volumes, and floor-level gully connections all accelerate the deterioration of pipe joints and materials. A drain that has never been surveyed in 20 years of commercial use almost certainly has condition issues that are not yet symptomatic — but will be.

## 7. Your insurance requires evidence of drainage maintenance

In particular, commercial property insurers increasingly require documented maintenance records as a condition of cover for drainage damage claims. A maintenance contract with a professional drainage company provides exactly this documentation. Without it, a claim for flood damage resulting from a blocked drain may be contested on the grounds of failure to maintain.

---

## What a commercial maintenance contract includes

Consequently, a [planned maintenance contract from Drains Cleared](/drains/drain-jetting) typically covers quarterly or biannual high-pressure jetting of kitchen and floor drains, grease trap inspection, written service logs, and priority callout rates if emergency intervention is required between scheduled visits.

Similarly, for a contract quotation based on your site size and service volume, call **0333 772 0123** or [book online](/book-online).