A plumber will be able to give you some great advice about water tanks, such as the best location and size. You will also be able to get an idea of how much the entire project will cost.

A licensed plumber is required by law wherever a tank is connected to the mains water supply, such as a tank to toilet system. A plumber is also required to connect your gutters to your tank and install an overflow to stormwater. It is important to ensure that the tanks overflow is securely connected back into the stormwater system.

A number of tank manufacturers can organise a plumber to provide installation for you. Some tank installations (particularly for large tanks) may require a building permit. Check with your local council.

In most situations, you can arrange delivery with the manufacturer or retailer. It is important to ensure that there is clear access from the street to where you want to put your tank.

The ground where a tank is going to be located needs to be levelled. Larger tanks will also require either sand or concrete foundations. The tank manufacturer’s instructions will guide you, but a plumber should also be consulted when deciding where to put your tank to maximise the catchment area.

The guttering on your roof is a major part of catching water and will need to be cleared of any leaves or debris. Damaged guttering should be repaired.

On some existing houses, the guttering may need to be adjusted to direct the water to the corner of your house where the tank will be installed. Try to make all pipes 'dry'. This means having a continuous downward path so water can't accumulate in them between flushes.

Lead-based paint and flashing or tar-based coatings found on some roofs affect water quality. Make sure your roof material is non-toxic.