The amount of water needed to pressure wash a house depends on several factors, including:
Size of the House – The larger the house, the more water you will need to pressure wash it. A small bungalow may only require a few hundred gallons of water, while a large two-story home could require several thousand gallons.
Type of Siding – Different types of siding require different amounts of water to clean. Vinyl siding, for example, is non-porous and can be cleaned with less water than wood or stucco siding.
Type of Surface You are Cleaning – The surface you are cleaning also affects the water required for pressure washing. For example, a brick or concrete surface may require less water than a wooden surface because wood is more porous and can absorb more water. The more porous the surface, the more water you need to clean it thoroughly.
Level of Dirt and Grime Buildup – The more dirt and grime build up on your home’s exterior, the more water you need to clean it. If your home has not been pressure washed in several years, it may require more water to get it clean.
Water Pressure – The pressure of your water source will also affect the amount of water needed to pressure wash your home. A higher-pressure water source will allow you to use less water to do the job.