Plumbing question


In the UK, connecting your gutter downpipe (taking rainwater) to the toilet downpipe (handling sewage) is generally not recommended and might not comply with building regulations. Here’s why:

  • Separate Systems: Most modern properties in the UK have separate drainage systems for foul water (wastewater from toilets, sinks, etc.) and surface water (rainwater from gutters). This prevents rainwater from overloading the sewage system and reduces the risk of sewage backups.
  • Building Regulations: Building regulations in the UK likely require these systems to be kept separate. Combining them could be a violation.

However, there are some rare cases where combining might be possible:

  • Very Old Properties: In extremely old properties, the drainage system might be a single combined system. But even then, modifications would likely need approval from a building inspector to ensure it meets current regulations.

Here’s what you should do:

  • Check Your Drainage System: It’s best to consult a plumber or drainage specialist to assess your specific situation. They can advise if you have a combined system or separate ones.
  • Building Regulations: If considering combining the systems, discuss it with a building inspector to understand the regulations and approval process.

Here are some additional resources:

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