Plan the entire rainwater route before foundations and roof edges are fixed. A gutter is only one link: roof area, outlets, downpipes, existing drainage, ground levels, boundaries and maintenance access must operate together.

Trace water from roof to destination

1. Record roof planes, valleys and adjoining house discharge.
2. Mark gutter falls, outlets and downpipes.
3. Identify the lawful final destination and existing system capacity.
4. Check door thresholds, paving falls and foundation interfaces.
5. Keep discharge away from neighbouring property and vulnerable walls.
6. Provide safe access for clearing leaves and inspecting joints.

Do not connect new rainwater to foul or combined systems without confirming the applicable local requirements and system design. Ground conditions and flood risk can affect drainage options.

FAQs

Can new guttering connect to the existing system?

Possibly, after the route, condition, capacity and permitted connection are checked. A nearby pipe is not confirmation.

Who should assess drainage before foundations are designed?

The project designer should coordinate with a competent drainage professional and the relevant authority or utility where needed.

Suggested component

A visual roof-to-outfall map that produces survey questions, not a drainage sizing result.

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