Plumbing contractor installing plastic PVC pipe in under the bathroom sink

What to know for plumbing new homes

With new houses popping up across Auckland and thousands more on the way, we’ve put together a guide to get you started when considering plumbing for a new house. When designing a plumbing system, the current needs of the house and potential future needs should all be considered. This means that the location of drain pipes, plumbing and sewage planning must be decided. To get expert advice during this process, reach out to South Auckland Plumbing today.

Maintain easy access to your home’s plumbing to save money on future repairs. Also, your external plumbing needs to have a sufficient number of external water faucets that you can use throughout your home. Here’s a guide to get you started.


Clean water enters the piping system at a pressure of 50-60 psi from the water supply line. Dirty water is pushed out of the piping system by gravity. Air flowing through the vents keeps the pipes clean and clear. This is a simple standalone setup that should last a long time if set up properly.


If you are installing plumbing in a new building, we recommend that you install the plumbing before interior finishing. Bathtubs, sinks and showers are much easier to install when the walls and doors are not yet in place. After installing plumbing fixtures, cover them with cardboard or plastic to keep them clean and dust-free during the rest of the build.


Firstly, you need to know how much of a septic tank you need based on the number of bedrooms in your new home. Septic tanks separate solid waste from liquid waste. Inside the tank, facultative and anaerobic microorganisms help break down solid waste. This process produces gaseous by-products that must be properly removed. Septic tanks and sewers are some of the most complex parts of a home’s plumbing system.

Iit is best to consider all areas that need access to water. The first 3 areas you should consider are the bathrooms, kitchen and laundry.

Bathrooms: Consider how many bathrooms you need when designing your home, and it’s best to rate them individually. Do you have a guest bathroom? It would be better to list what luxury items your bathroom will have, as well as the necessary toilets and sinks.

Kitchen: When designing a kitchen, it is necessary to take into account the appliances that you will have in the kitchen. You may need plumbing lines for your refrigerator, dishwasher and sink. You should also consider any future renovations you may have, such as adding a kitchen island that requires plumbing if you want to install a sink in the future.

Laundry: Equally important as the aforementioned, you should also have a proper laundry drain line so that water doesn’t pool on the floor every time you wash your clothes. Apart from these three priorities, you must also have proper plumbing if you want a garden, spa or pool. Prepare a layout for everything, even the ones you don’t need right now, to make it easier to install in the future.

For your 24/7 expert plumbing needs, give us a call or email today to request our help.


As registered Master Plumbers our work is covered by the Master Plumbers Guarantee for 12 months, giving you peace of mind.