That matters because it changes the options. Roots at a single joint may be a small repair or a relined section. A collapsed length is a different job. A sag needs the grade corrected rather than the pipe replaced. Without seeing it, any quote is an estimate built on assumption, and you have no way to judge whether the fix is proportionate.
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For a burst pipe or a serious leak, turn the water off at the mains tap before you call. If water is anywhere near power points, the switchboard or light fittings, stay clear and treat it as an electrical hazard. Do not enter standing water in a room with live power.
