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Reviewed: 22 September 2026

Rainwater and greywater reuse

Water reuse options considered with storage, treatment, plumbing separation, maintenance and demand.

Practical Points

  • 1.

    Measure likely demand and identify collection, storage, overflow and access.

  • 2.

    Keep non-potable systems separated, labelled and protected against cross-connection.

  • 3.

    Plan filters, pumps, treatment, inspections and a safe mains backup.

Considerations & Trade-offs

  • Tanks and plant occupy space and add maintenance and energy use.

  • Water saving depends on occupancy, rainfall, demand and reliable upkeep.

Concept Scenarios

CONCEPT CASE STUDY — NOT A D-CORE PROJECT

Rear extension concept

A concept route for a connected living space, with envelope, daylight, drainage and heating considered before finishes.

Options Included:

  • Single-storey extension with rooflights
  • Glazed opening with shading considered early
  • Fabric-first shell with later fit-out

Related Internal Resources

Advice: Drainage when extending a house Editorial: Low-carbon systems and new technology: compare the whole home Inspiration: Extensions Service: Plan drainage

Official Guidance & Technical Sources

Content angles / Explore further

  • • WhatsApp: ask where a reuse system stores water, overflows and gets safely isolated.
  • • YouTube: explain how non-potable pipework stays separated, labelled and maintainable.
  • • Nextdoor: share the demand, rainfall and maintenance questions before choosing a tank.