Illustrative image of the relevant drainage feature or investigation.
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Get quotes from local drainage specialists ↗Why it happens
A blocked rainwater gully may overflow against thresholds or low-level walls during storms. Look for leaves, silt or standing water at the gully after rain.
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
Look for leaves, silt or standing water at the gully after rain. 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 specialist can check the gully outlet and drainage route. Flooding can also result from inadequate falls or surface grading. 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.