How Far Should Your Toilet Drain Pipe Be from the Wall? A Guide

Before installing the toilet drainage pipe, it is essential to pre-reserve the dimensions to avoid installation issues. Below, I will explain the recommended distance of the toilet drainage pipe from the wall.

一、How far should the toilet drainage pipe be from the wall：

Generally, the distance from the wall should be around 30 to 40 centimeters. When installing a toilet with a vertical drainage system, the distance from the wall to the drainage outlet must equal or be less than the distance from the outlet to the wall. For a horizontal drainage toilet, the distance from the outlet should equal or exceed the height of the drainage outlet.

二、Considerations for toilet size selection：

1、Distance from the wall to the drainage outlet

Typically, common "pit distances" (the distance from the back wall to the toilet's drainage outlet) are around 20cm, 30cm, and 40cm; most families choose 30cm. However, it’s not sufficient to only consider the pit distance. The size of the water tank at the back of the toilet also affects the dimensions and positioning. You need to check if a 30cm pit distance will touch the wall. If it does, you will need to replace it; if it fits well or is just right, then the size is suitable.

2、Drainage outlet dimensions

The drainage outlet size is typically around 8cm, and the pipe diameter should be 110mm for the drainage pipe. The hole distance is from the drainage outlet to the wall. Different toilets have different hole distances, so it is essential to measure the hole distance beforehand. If the pit distance is incorrect, you may need to use a distance adapter, which usually adjusts by about 5cm; however, this is not recommended as it may affect drainage efficiency.

3、Toilet dimensions

Generally, the height from the top to the bottom of the water tank is around 75 to 83cm, and the seat height is approximately 36 to 43cm. The width dimensions are usually between 68 to 73cm.

Conclusion：The relevant information about how far the toilet drainage pipe should be from the wall is introduced here. Typically, the distance from the wall should be around 30 to 40 centimeters. It is crucial to pre-reserve this dimension before installation to avoid issues. I hope the above information is helpful to everyone.