Illustrative image of the relevant drainage feature or investigation.
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Get quotes from local drainage specialists ↗Why it happens
Heavy rain can overload a combined system or wash debris into a poorly protected gully. Check whether the problem occurs only in storms or in ordinary dry-weather use.
Older homes can have clayware pipes, later plastic repairs and altered connections in the same drainage run. A defect at one joint does not necessarily describe the rest of the system.
Useful evidence to collect
Check whether the problem occurs only in storms or in ordinary dry-weather use. Where safe, take dated photographs and note which appliances still work normally. Never enter a chamber or work around foul water without appropriate training and protection.
What repair is proportionate?
A contractor can assess covers, gullies, capacity and nearby connections. A rain-related surcharge does not automatically mean your private pipe is broken. A sensible recommendation should match the defect found and explain why a smaller repair would not be enough.
Before you agree to major work
Get the proposed work and its limits in writing. For costly repairs, ask for photographs or survey evidence locating the defect and consider a second quotation. Where the affected run may be shared or adopted, check ownership before arranging privately funded work.