Expandify homes do not come with a built-in rainwater harvesting system but are designed for easy integration. Homeowners can install: Rainwater Tanks , Expandify homes feature pre-installed gutters and downpipes suitable for water collection. Filtration & Pump Systems , Optional add-ons to make collected water potable. Greywater Recycling , Expandify homes can be adapted for sustainable water use and off-grid living. Customers should check local council regulations regarding rainwater system approvals.