How To Plumb A Toilet

If the need ever arouse would you know how to plumb a toilet? Although some plumbing jobs should be left to professionals there are other jobs you could do yourself whereby you can save yourself some money.

All you need is a good book on plumbing, a bit of DIY savvy and a willingness to give it a go. Before you decide whether you want to know how to plumb a toilet take a look at these general guidelines and decide whether doing your own plumbing is within your capabilities.

A step by step guide to plumbing a toilet

Before you start any DIY job you need to ensure you have the right tools. To plumb a toilet the tools you need are:

  1. Copper pipes
  2. Drainage fixtures
  3. Auger/cutting drill
  4. Rubber Fittings
  5. Hard Gum
  6. A plumbing tool box (containing wrench, hammer etc.)

Where to put the toilet

Before plumbing a toilet the first thing to decide is where to put it. In most cases this will be pretty obvious as there is only one place it will fit. If you are refurbishing your bathroom suite however and want to rearrange the layout of the furniture you should check that it is possible to complete the plumbing works based on your design.

Cut through the floor

Under the floorboards you will find a 1/2-inch draining pipe that comes up from the floor or out of the wall. You need to determine the route of your pipes to get from the position of the toilet to the pipe. Once you have determined this is possible cut a small round hole in the floorboard from the pipe to pass through.




Connecting the stack pipe

The stack pipe is the large pipes you see on the outside of your house and comes into your bathroom through the wall. Ideally your toilet should be close to the stack pipe or you will create more work for yourself connect the drainage system of you toilet.

Use a ‘T’ pipe to hook the drain to a 4-inch stack pipe making sure that the drain pipe is sloping towards the stack at an angle 1/8 or ¼ inch per foot. Ideally it will be vertical, but this is not always possible. This pipe should be no longer than 6 feet and should be leveled at an angle to allow the waste to flow through otherwise it will get clogged. Wider piping will prevent blockages.

Reinforcing the floor

After fixing up the toilet reinforce the ground beneath and around it as a precaution so that the floor can take the weight of the toilet and anybody sitting on it. Moisture that collects in bathrooms over a period of time can weaken the floorboards and excess weight will cause it to crack and become unsafe.

Final Fittings

The final fitting is attaching the drain pipe coming up from the floor beside the toilet pedestal. This pipe needs to be connected with a closet bend which is further connected to the stack pipe by the sloping leveled pipe.


There are not many steps to fitting your own toilet, but it is not a job you want to get wrong. If you want to know more about how to plumb a toilet is worthwhile investing in a well illustrated instruction manual.

If having read this you think you need help from the professionals don’t worry DIY isn’t for everyone. If you need help installing a toilet in the Hertfordshire, England area contact DIS Plumbing a St Albans Plumbing Company without delay!

Image Credits: Marlene Manto and anastaz1a.

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